View Filing Data

Print Document View Excel Document

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2011	Jun. 30, 2011
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Trading Symbol	cmcsa
Entity Registrant Name	COMCAST CORP
Entity Central Index Key	0001166691
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding	2,095,476,503
Entity Public Float		$ 52,897
Class A Special Common Stock [Member]
Entity Common Stock, Shares Outstanding	601,012,813
Entity Public Float		$ 15,494
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding	9,444,375

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 1,620	$ 5,984
Receivables, net	4,351	1,855
Programming rights	987	122
Other current assets	1,615	925
Total current assets	8,573	8,886
Film and television costs	5,227	460
Investments	9,854	6,670
Property and equipment, net	27,559	23,515
Franchise rights	59,376	59,442
Goodwill	26,874	14,958
Other intangible assets, net	18,165	3,431
Other noncurrent assets, net	2,190	1,172
Total assets	157,818	118,534
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	5,705	3,291
Accrued participations and residuals	1,255	0
Deferred revenue	790	83
Accrued expenses and other current liabilities	4,124	3,060
Current portion of long-term debt	1,367	1,800
Total current liabilities	13,241	8,234
Long-term debt, less current portion	37,942	29,615
Deferred income taxes	29,932	28,246
Other noncurrent liabilities	13,034	7,862
Commitments and contingencies (Note 19)	0	0
Redeemable noncontrolling interests	16,014	143
Equity:
Preferred stock - authorized, 20,000,000 shares; issued, zero	0	0
Common stock	32	32
Additional paid-in capital	40,940	39,780
Retained earnings	13,971	12,158
Treasury stock, 365,460,750 Class A common shares and 70,934,764 Class A Special common shares	(7,517)	(7,517)
Accumulated other comprehensive income (loss)	(152)	(99)
Total Comcast Corporation shareholders' equity	47,274	44,354
Noncontrolling interests	381	80
Total equity	47,655	44,434
Total liabilities and equity	157,818	118,534
Class A Common Stock [Member]
Equity:
Common stock	25	24
Class A Special Common Stock [Member]
Equity:
Common stock	7	8
Class B Common Stock [Member]
Equity:
Common stock	$ 0	$ 0

Consolidated Balance Sheet (Parenthetical) - $ / shares	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Class A Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	2,460,937,253	2,437,281,651
Common stock, outstanding	2,095,476,503	2,071,820,901
Treasury stock common shares	365,460,750	365,460,750
Class A Special Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	671,947,577	766,168,658
Common stock, outstanding	601,012,813	695,233,894
Treasury stock common shares	70,934,764	70,934,764
Class B Common Stock [Member]
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	75,000,000	75,000,000
Common stock, issued	9,444,375	9,444,375
Common stock, outstanding	9,444,375	9,444,375

Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended								12 Months Ended
Consolidated Statement of Income - USD ($) $ in Millions	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement of Income
Revenue	$ 15,042	$ 14,339	$ 14,333	$ 12,128	$ 9,721	$ 9,489	$ 9,525	$ 9,202	$ 55,842	$ 37,937	$ 35,756
Costs and Expenses:
Operating costs and expenses									37,485	23,341	22,042
Depreciation									6,040	5,539	5,483
Amortization									1,596	1,077	1,017
Costs and Expenses, Total									45,121	29,957	28,542
Operating income	2,918	2,641	2,938	2,224	2,013	1,954	2,078	1,935	10,721	7,980	7,214
Other Income (Expense):
Interest expense									(2,505)	(2,156)	(2,348)
Investment income (loss), net									159	288	282
Equity in net income (losses) of investees, net									(35)	(141)	(64)
Other income (expense), net									(133)	133	22
Nonoperating income (expense)									(2,514)	(1,876)	(2,108)
Income before income taxes									8,207	6,104	5,106
Income tax expense									(3,050)	(2,436)	(1,478)
Net income from consolidated operations									5,157	3,668	3,628
Net (income) loss attributable to noncontrolling interests									(997)	(33)	10
Net income attributable to Comcast Corporation	$ 1,287	$ 908	$ 1,022	$ 943	$ 1,018	$ 867	$ 884	$ 866	$ 4,160	$ 3,635	$ 3,638
Basic earnings per common share attributable to Comcast Corporation shareholders	$ 0.47	$ 0.33	$ 0.37	$ 0.34	$ 0.37	$ 0.31	$ 0.31	$ 0.31	$ 1.51	$ 1.29	$ 1.27
Diluted earnings per common share attributable to Comcast Corporation shareholders	0.47	0.33	0.37	0.34	0.36	0.31	0.31	0.31	1.50	1.29	1.26
Dividends declared per common share attributable to Comcast Corporation shareholders	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.45	$ 0.378	$ 0.297

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement of Comprehensive Income
Net income from consolidated operations	$ 5,157	$ 3,668	$ 3,628
Unrealized gains (losses) on marketable securities, net of deferred taxes of $(2), $- and $(4)	4	9	8
Deferred gains (losses) on cash flow hedges, net of deferred taxes of $15, $47 and $-	(25)	(80)
Realized (gains) losses on marketable securities, net of deferred taxes of $5, $2 and $2	(8)	(2)	(4)
Realized (gains) losses on cash flow hedges, net of deferred taxes of $(11), $(21) and $(20)	20	34	34
Employee benefit obligations, net of deferred taxes of $22, $9 and $(15)	(70)	(13)	25
Currency translation adjustments, net of deferred taxes of $3, $- , and $-	(12)	(1)	4
Comprehensive income	5,066	3,615	3,695
Net (income) loss attributable to noncontrolling interests	(997)	(33)	10
Other comprehensive (income) loss attributable to noncontrolling interests	38
Comprehensive income attributable to Comcast Corporation	$ 4,107	$ 3,582	$ 3,705

Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Unrealized gains (losses) on marketable securities, deferred taxes	$ (2)	$ 0	$ (4)
Deferred gains (losses) on cash flow hedges, deferred taxes	15	47	0
Realized (gains) losses on marketable securities, deferred taxes	5	2	2
Realized (gains) losses on cash flow hedges, deferred taxes	(11)	(21)	(20)
Employee benefit obligations, deferred taxes	22	9	(15)
Currency translation adjustments, deferred taxes	$ 3	$ 0	$ 0

- Definition

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity that is attributable to the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4569643-111683

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=6921628&loc=SL4569616-111683

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6921930&loc=SL4573702-111684

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net income from consolidated operations	$ 5,157	$ 3,668	$ 3,628
Adjustments to reconcile net income from consolidated operations to net cash provided by operating activities:
Depreciation and amortization	7,636	6,616	6,500
Amortization of film and television costs	6,787	187	349
Share-based compensation	344	300	257
Noncash interest expense (income), net	146	141	160
Equity in net (income) losses of investees, net	35	141	64
Cash received from investees	311	0	0
Net (gain) loss on investment activity and other	23	(267)	(201)
Deferred income taxes	1,058	549	832
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Change in receivable, net	(18)	(131)	(84)
Change in film and television costs	(7,080)	(191)	(404)
Change in accounts payable and accrued expenses related to trade creditors	(45)	37	(136)
Change in other operating assets and liabilities	(9)	129	(684)
Net cash provided by (used in) operating activities	14,345	11,179	10,281
Investing Activities
Capital expenditures	(5,307)	(4,961)	(5,117)
Cash paid for intangible assets	(954)	(536)	(522)
Acquisitions, net of cash acquired	(6,407)	(183)	(88)
Proceeds from sales of businesses and investments	277	99	102
Purchases of investments	(135)	(260)	(346)
Other	18	130	74
Net cash provided by (used in) investing activities	(12,508)	(5,711)	(5,897)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	544	0	0
Proceeds from borrowings	0	3,420	1,564
Repurchases and repayments of debt	(3,216)	(1,153)	(4,738)
Repurchases and retirements of common stock	(2,141)	(1,200)	(765)
Dividends paid	(1,187)	(1,064)	(761)
Issuances of common stock	283	34	1
Distributions to noncontrolling interests	(325)	(67)	(49)
Other	(159)	(125)	(160)
Net cash provided by (used in) financing activities	(6,201)	(155)	(4,908)
Increase (decrease) in cash and cash equivalents	(4,364)	5,313	(524)
Cash and cash equivalents, beginning of year	5,984	671	1,195
Cash and cash equivalents, end of year	$ 1,620	$ 5,984	$ 671

Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Redeemable Noncontrolling Interests [Member]	Class A Common Stock [Member]	Class A Special Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2008	$ 40,576	$ 171	$ 24	$ 9	$ 0	$ 40,620	$ 7,427	$ (7,517)	$ (113)	$ 126
Stock compensation plans	159					159
Repurchase and retirement of common stock	(765)			(1)		(554)	(210)
Employee stock purchase plan	61					61
Dividends declared	(850)						(850)
Other comprehensive income (loss)	67								67
Sale (purchase) of subsidiary shares to (from) noncontrolling interests, net	(51)					(39)				(12)
Contributions from (distributions to) noncontrolling interests	(28)	9								(28)
Net income (loss)	3,642	(14)					3,638			4
Ending Balance at Dec. 31, 2009	42,811	166	24	8	0	40,247	10,005	(7,517)	(46)	90
Stock compensation plans	238					242	(4)
Repurchase and retirement of common stock	(1,200)					(781)	(419)
Employee stock purchase plan	61					61
Dividends declared	(1,059)						(1,059)
Other comprehensive income (loss)	(53)								(53)
Sale (purchase) of subsidiary shares to (from) noncontrolling interests, net	11	(20)				11
Contributions from (distributions to) noncontrolling interests	(44)	(2)								(44)
Net income (loss)	3,669	(1)					3,635			34
Ending Balance at Dec. 31, 2010	44,434	143	24	8	0	39,780	12,158	(7,517)	(99)	80
Stock compensation plans	469		1			509	(41)
Repurchase and retirement of common stock	(2,141)			(1)		(1,067)	(1,073)
Employee stock purchase plan	68					68	0
Dividends declared	(1,233)						(1,233)
Other comprehensive income (loss)	(53)	(38)							(53)
NBCUniversal transaction	1,869	15,198				1,605				264
Issuance of subsidiary shares to noncontrolling interests	88	83				45				43
Contributions from (distributions to) noncontrolling interests	(161)	(214)								(161)
Net income (loss)	4,315	842					4,160			155
Ending Balance at Dec. 31, 2011	$ 47,655	$ 16,014	$ 25	$ 7	$ 0	$ 40,940	$ 13,971	$ (7,517)	$ (152)	$ 381

Organization and Business

12 Months Ended

Dec. 31, 2011

Organization and Business [Abstract]

Organization and Business

Note 1: Organization and Business

We are a Pennsylvania corporation and were incorporated in December 2001. Through our predecessors, we have developed, managed and operated cable systems since 1963. On January 28, 2011, we closed our transaction with GE in which we acquired a 51% controlling interest in the businesses of NBCUniversal, a leading media and entertainment company that develops, produces and distributes entertainment, news and information, sports, and other content to global audiences. NBCUniversal's results of operations from January 29, 2011 through December 31, 2011 are included in our consolidated results of operations. See Note 4 for additional information on the transaction.

As a result of the NBCUniversal transaction, we report our operations as the following five reportable business segments: Cable Communications (previously our Cable segment), Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks. See Note 20 for additional information on our reportable segments.

Our Cable Communications segment is primarily involved in the management and operation of cable systems serving residential and business customers in the United States. As of December 31, 2011, we served approximately 22.3 million video customers, 18.1 million high-speed Internet customers and 9.3 million voice customers.

Our Cable Networks segment consists primarily of our national cable entertainment networks (USA Network, Syfy, E!, Bravo, Oxygen, Style, G4, Chiller, Cloo (formerly Sleuth) and Universal HD); our national cable news and information networks (CNBC, MSNBC and CNBC World); our national cable sports networks (Golf Channel and NBC Sports Network (formerly VERSUS)); our 13 regional sports and news networks; our international cable networks (including CNBC Europe, CNBC Asia and our Universal Networks International portfolio of networks); our cable television production studio; and our related digital media properties, which consist primarily of brand-aligned and other websites, such as DailyCandy, Fandango and iVillage.

Our Broadcast Television segment consists primarily of our NBC and Telemundo broadcast networks, our NBC and Telemundo owned local television stations, our broadcast television production operations, and our related digital media properties, which consist primarily of brand-aligned websites.

Our Filmed Entertainment segment consists of the operations of Universal Pictures, including Focus Features, which produces, acquires, markets and distributes filmed entertainment worldwide in various media formats for theatrical, home entertainment, television and other distribution platforms. We also develop, produce and license stage plays.

Our Theme Parks segment consists primarily of our Universal theme parks in Orlando and Hollywood. We also receive fees from intellectual property licenses and other services from third parties that own and operate Universal Studios Japan and Universal Studios Singapore.

Our other business interests primarily include Comcast Spectacor, which owns the Philadelphia Flyers and the Wells Fargo Center, a large, multipurpose arena in Philadelphia. Comcast Spectacor also owns Global Spectrum, which provides facilities management, and Ovations Food Services, which provides food services, for sporting events, concerts and other events. We also own equity method investments in other cable networks and wireless-related companies.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Note 2: Summary of Significant Accounting Policies

Basis of Consolidation

The accompanying consolidated financial statements include (i) all of our accounts, (ii) all entities in which we have a controlling voting interest (“subsidiaries”) and (iii) variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”). We have eliminated intercompany accounts and transactions among consolidated entities.

Use of Estimates

We prepare our consolidated financial statements in accordance with GAAP, which requires us to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates. Estimates are used when accounting for various items, including the fair value of acquisition-related assets and liabilities, allowances for doubtful accounts, amortization of owned and acquired programming, impairment of capitalized film and television costs, participation and residual accruals, investments, derivative financial instruments, asset impairments, nonmonetary transactions, pensions and other postretirement benefits, revenue recognition, estimates of DVD and Blu-ray discs (together, “DVDs”) returns and customer incentives, depreciation and amortization, income taxes, legal contingencies, and other contingent liabilities. See Note 11 for our discussion on fair value measurements.

Cash Equivalents

The carrying amounts of our cash equivalents approximate their fair value. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of less than three months when purchased.

Film and Television Costs

We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to operating costs and expenses. We record the amortization and the accrued costs using the ratio of the current period's actual revenue to the estimated total remaining gross revenue from all sources, which is referred to as ultimate revenue. Estimates of total revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the exhibition, licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of film and television programming.

In determining the estimated lives and method of amortization of acquired film and television libraries, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset.

Upon the occurrence of an event or change in circumstance that may indicate that the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film's fair value.

We enter into arrangements with third parties to jointly finance and distribute certain of our film productions. These arrangements, which are referred to as cofinancing arrangements, can take various forms. In most cases, the form of the arrangement involves the grant of an economic interest in a film to a third-party investor. The number of investors and the terms of these arrangements can also vary, although in most cases an investor assumes full risk for the portion of the film acquired in these arrangements. We account for our proceeds under these arrangements as a reduction to our capitalized film costs. In these arrangements, the investor owns an undivided copyright interest in the film and, therefore, in each period we record either a charge or benefit to operating costs and expenses to reflect the estimate of the third-party investor's interest in the profit or loss of the film. The estimate of the third-party investor's interest in profit or loss of a film is determined by reference to the ratio of actual revenue earned to date in relation to the ultimate revenue expected to be recognized over a film's useful life.

We capitalize costs of programming content that we license, but do not own, including rights to multiyear live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is available for use. We amortize capitalized programming costs as the associated programs are broadcast. We amortize multiyear, live-event sports programming rights using the ratio of the current period's actual direct revenue to the estimated total remaining direct revenue or over the contract term.

We state the costs of acquired programming at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Acquired programming used in our Cable Networks segment is tested on a channel basis for impairment, whereas acquired programming in our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we will recognize an impairment charge to operating costs and expenses.

See Note 5 for additional information on our film and television costs.

Investments

We classify publicly traded investments that are not accounted for under the equity method as available-for-sale (“AFS”) or trading securities and record them at fair value. For AFS securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of other comprehensive income (loss), except when we consider declines in value to be other than temporary. For trading securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of investment income (loss), net. We recognize realized gains and losses associated with our fair value method investments using the specific identification method. We classify the cash flows related to purchases of and proceeds from the sale of trading securities based on the nature of the securities and the purpose for which they were acquired. Investments in privately held companies are generally stated at cost.

We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee's operating and financial policies. Equity method investments are recorded at cost and are adjusted to recognize (i) our proportionate share of the investee's net income or losses after the date of investment, (ii) amortization of the recorded investment that exceeds our share of the book value of the investees' net assets, (iii) additional contributions made and dividends received, and (iv) impairments resulting from other-than-temporary declines in fair value. For certain investments, we record our share of the investee's net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net.

We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our AFS and cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net.

If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income.

Property and Equipment

Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense.

We capitalize the costs associated with the construction of and improvements to our cable transmission and distribution facilities and new service installations. Costs include all direct labor and materials, as well as various indirect costs. We capitalize initial customer installation costs that are directly attributable to installation of the drop, including material, labor and indirect costs, in accordance with accounting guidance related to cable television companies. All costs incurred in connection with subsequent service disconnections and reconnections are expensed as they are incurred. We record depreciation using the straight-line method over the asset's estimated useful life. See Note 7 for our significant components of property and equipment.

We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeds its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.

Intangible Assets

Indefinite-Lived Intangible Assets

Franchise Rights

Our franchise rights consist primarily of cable franchise rights. Cable franchise rights represent the value we attributed to agreements with state and local authorities that allow access to homes and businesses in cable service areas acquired in business combinations. We also have sports franchise rights, which represent the value we attributed to our professional sports team that was acquired in a business combination. We do not amortize our franchise rights because we have determined that they meet the definition of an indefinite-lived intangible asset. We reassess this determination periodically or whenever events or substantive changes in circumstances occur. Costs we incur in negotiating and renewing cable franchise agreements are included in other intangible assets and are generally amortized on a straight-line basis over the term of the franchise agreement.

Other

Other indefinite-lived intangible assets include trade names and FCC licenses.

* * *

We evaluate the recoverability of our franchise rights and other indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. We estimate the fair value of our cable franchise rights and other indefinite-lived intangible assets primarily based on a discounted cash flow analysis. In analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the value of our cable franchise rights or other indefinite-lived intangible assets were less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. We also evaluate the unit of account used to test for impairment of our cable franchise rights and other indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The Cable Communications divisions represent the units of account we use to test for impairment for our cable franchise rights.

Goodwill

We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the asset might be impaired. In our Cable Communications business, since components one level below the segment level (Cable Communications divisions) are not separate reporting units and have similar economic characteristics, we aggregate the components into one reporting unit at the Cable Communications segment level. In our NBCUniversal businesses, our reporting units containing goodwill are also aggregated at the segment level. The assessment of recoverability considers if the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit's goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.

Finite-Lived Intangible Assets

Finite-lived intangible assets subject to amortization consist primarily of customer relationships acquired in business combinations, cable franchise renewal costs, contractual operating rights, intellectual property rights and software. These assets are amortized primarily on a straight-line basis over their estimated useful lives or the terms of the respective agreements. See Note 8 for the ranges of useful lives of our intangible assets.

We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs within other intangible assets and amortize them on a straight-line basis over a period not to exceed 5 years, beginning when the asset is substantially ready for use. We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware.

* * *

We evaluate the recoverability of our intangible assets subject to amortization whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows is less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeds its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.

Asset Retirement Obligations

We recognize a liability for an asset retirement obligation in the period in which it is incurred if a reasonable estimate of fair value can be made.

Certain of our cable franchise agreements and lease agreements contain provisions requiring us to restore facilities or remove property in the event that the franchise or lease agreement is not renewed. We expect to continually renew our cable franchise agreements and therefore cannot reasonably estimate any liabilities associated with such agreements. A remote possibility exists that franchise agreements could be terminated unexpectedly, which could result in us incurring significant expense in complying with restoration or removal provisions. The disposal obligations related to our properties are not material to our consolidated financial statements. We do not have any significant liabilities related to asset retirements recorded in our consolidated financial statements.

Revenue Recognition

Cable Communications Segment

Our Cable Communications segment generates revenue primarily from subscriptions to our video, high-speed Internet and voice services (“cable services”) and from the sale of advertising. We recognize revenue from cable services as each service is provided. We manage credit risk by screening applicants through the use of internal customer information, identification verification tools and credit bureau data. If a customer's account is delinquent, various measures are used to collect outstanding amounts, including termination of the customer's cable service. Since installation revenue obtained from the connection of customers to our cable systems is less than related direct selling costs, we recognize revenue as connections are completed.

As part of our programming license agreements with cable networks, we generally receive an allocation of scheduled advertising time that we may sell to local, regional and national advertisers. We recognize advertising revenue when the advertising is aired and based on the broadcast calendar. In most cases, the available advertising time is sold by our sales force. In some cases, we work with representation firms as an extension of our sales force to sell a portion of the advertising time allocated to us. We also coordinate the advertising sales efforts of other multichannel video providers in some markets, and in some markets we operate advertising interconnects. Since we are acting as the principal in these arrangements, we report the advertising that is sold as revenue and the fees paid to representation firms and multichannel video providers as operating costs and expenses.

Revenue earned from other sources is recognized when services are provided or events occur. Under the terms of our cable franchise agreements, we are generally required to pay to the franchising authority an amount based on our gross video revenue. We normally pass these fees through to our cable customers and classify the fees as a component of revenue with the corresponding costs included in operating costs and expenses. We present other taxes imposed on a revenue-producing transaction as revenue if we are acting as the principal or as a reduction to operating costs and expenses if we are acting as an agent.

Cable Networks and Broadcast Television Segments

Our Cable Networks segment primarily generates revenue from the distribution of our cable network programming, the sale of advertising and the licensing and sale of our owned programming. Our Broadcast Television segment primarily generates revenue from the sale of advertising and the licensing and sale of our owned programming. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution.

Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee viewer ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until such shortfall is settled, primarily by providing additional advertising time. We record revenue from the licensing of television productions when the content is available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the advertising time component of revenue when the advertisements are aired.

Filmed Entertainment Segment

Our Filmed Entertainment segment generates revenue from the worldwide theatrical release of our owned and acquired films, the licensing of owned and acquired films to broadcast, cable and premium networks, and the licensing and sale of our owned and acquired films on DVD and through various digital media platforms. We also generate revenue from distributing third parties' filmed entertainment, producing stage plays, publishing music and licensing consumer products. We recognize <>revenue from the theatrical distribution of films when films are exhibited. We record revenue from the licensing of a film when the content is available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the advertising time component of revenue when the advertisements are aired. We recognize revenue from DVD sales, net of estimated returns and customer incentives, on the date that DVDs are delivered to and made available for sale by retailers.

Theme Parks Segment

Our Theme Parks segment generates revenue primarily from theme park attendance and per capita spending, as well as from management, licensing and other fees. We recognize <>revenue from advance theme park ticket sales when the tickets are used. For multiday or annual passes, we recognize revenue over the period of benefit based on estimated usage patterns that are derived from historical experience.

Cable Communications Programming Expenses

Cable Communications programming expenses are the fees we pay to license the programming we distribute to our video customers. Programming is acquired for distribution to our video customers, generally under multiyear distribution agreements, with rates typically based on the number of customers that receive the programming, adjusted for channel positioning and the extent of distribution. From time to time these contracts expire and programming continues to be provided under interim arrangements while the parties negotiate new contractual terms, sometimes with effective dates that affect prior periods. While payments are typically made under the prior contract's terms, the amount of our programming expenses recorded during these interim arrangements is based on our estimates of the ultimate contractual terms expected to be negotiated. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution.

When our Cable Communications segment receives incentives from cable networks for the licensing of their programming, we defer a portion of these incentives, which are included in other current and noncurrent liabilities, and recognize them over the term of the contract as a reduction to programming expenses, which are included in operating costs and expenses.

Advertising Expenses

Advertising costs are expensed as incurred. See Note 17 for additional information on advertising costs incurred

Share-Based Compensation

Our share-based compensation consists of awards of stock options and restricted share units (“RSUs”) and the discounted sale of company stock to employees through our employee stock purchase plans. For stock options and RSUs, associated costs are based on an award's estimated fair value at the date of grant and are recognized over the period in which any related services are provided. See Note 15 for additional information on our share-based compensation.

Postretirement and Pension Benefits

We provide postretirement medical benefits for substantially all of our employees who meet certain age and service requirements. Following the close of the NBCUniversal transaction on January 28, 2011, NBCUniversal established new defined benefit plans covering the majority of its U.S. employees (the “qualified plan”) and executives (the “nonqualified plan”) and other postretirement plans, such as medical and life insurance plans. NBCUniversal's new defined benefit pension plans are currently unfunded noncontributory plans. The qualified plan is not open to new participants.

As of December 31, 2011, we also sponsored two pension plans that together provided benefits to substantially all former AT&T Broadband employees. Future benefits for both pension plans have been frozen.

Pension and other postretirement benefits are based on formulas that reflect the employees' years of service, compensation during their employment period and participation in the plans. The expense we recognize related to our benefit plans is determined using certain assumptions, including the expected long-term rate of return on plan assets and discount rate, among others. We recognize the funded or unfunded status of our defined benefit and other postretirement plans, other than multiemployer plans, as an asset or liability in our consolidated balance sheet and recognize changes in the funded status in the year in which the changes occur through accumulated other comprehensive income (loss).

See Note 13 for additional information on our postretirement and pension benefits.

Income Taxes

We base our provision for income taxes on our current period income, changes in our deferred income tax assets and liabilities, income tax rates, changes in estimates of our uncertain tax positions, and tax planning opportunities available in the jurisdictions in which we operate. We recognize deferred tax assets and liabilities when there are temporary differences between the financial reporting basis and tax basis of our assets and liabilities and for the expected benefits of using net operating loss carryforwards. When a change in the tax rate or tax law has an impact on deferred taxes, we apply the change based on the years in which the temporary differences are expected to reverse. We record the change in our consolidated financial statements in the period of enactment.

Income tax consequences that arise in connection with a business combination include identifying the tax basis of assets and liabilities acquired and any contingencies associated with uncertain tax positions assumed or resulting from the business combination. Deferred tax assets and liabilities related to temporary differences of an acquired entity are recorded as of the date of the business combination and are based on our estimate of the ultimate tax basis that will be accepted by the various taxing authorities. We record liabilities for contingencies associated with prior tax returns filed by the acquired entity based on criteria set forth in the accounting guidance related to accounting for uncertainty in income taxes. We adjust the deferred tax accounts and the liabilities periodically to reflect any revised estimated tax basis and any estimated settlements with the various taxing authorities. The effects of these adjustments are recorded to income tax expense.

We classify interest and penalties, if any, associated with our uncertain tax positions as a component of income tax expense.

Derivative Financial Instruments

We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in interest rates, foreign exchange rates and equity prices. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Derivative financial instruments are recorded in our consolidated balance sheet at fair value. We formally document, at the inception of the relationship, derivative financial instruments designated to hedge the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment (“fair value hedge”) or the exposure to changes in cash flows of a forecasted transaction (“cash flow hedge”), and we evaluate them for effectiveness at the time they are designated, as well as throughout the hedging period.

For derivative financial instruments designated as fair value hedges, changes in the fair value of the derivative financial instrument substantially offset changes in the fair value of the hedged item, each of which is recorded to the same line in our consolidated statement of income. When fair value hedges are terminated, sold, exercised or have expired, any gain or loss resulting from changes in the fair value of the hedged item is deferred and recognized in earnings over the remaining life of the hedged item. When the hedged item is settled or sold, the unamortized adjustment is recognized in earnings. For derivative financial instruments designated as cash flow hedges, the effective portion of the change in fair value of the derivative financial instrument is reported in accumulated other comprehensive income (loss) and recognized as an adjustment to earnings over the period in which the hedged item is recognized in our consolidated statement of income. When the hedged item is settled or becomes probable of not occurring, any remaining unrealized gain or loss from the hedge is recognized in earnings. Cash flows from hedging activities are classified under the same category as the cash flows from the hedged items in our consolidated statement of cash flows. The ineffective portion of changes in fair value for designated hedges is recognized on a current basis in earnings.

For those derivative financial instruments that are not designated as hedges, changes in fair value are recognized on a current basis in earnings. Derivative financial instruments embedded in other contracts are separated from their host contract. The derivative component is recorded at its estimated fair value in our consolidated balance sheet and changes in its fair value are recognized on a current basis in earnings.

We do not engage in any speculative or leveraged derivative transactions. All derivative transactions must comply with the derivatives policy approved by our Board of Directors.

See Note 10 for additional information on our derivative financial instruments.

Foreign Currency Translation

Functional currencies are determined based on entity-specific economic and management indicators. We translate assets and liabilities of our foreign subsidiaries where the functional currency is the local currency, primarily the euro and the British pound, into U.S. dollars at the exchange rate in effect at the balance sheet date. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss). We translate revenue and expenses using average monthly exchange rates. Foreign currency transaction gains and losses are included in operating costs and expenses or other income (expense), depending on the nature of the underlying transaction.

Reclassifications

Reclassifications have been made to the prior year's consolidated balance sheet to programming rights, other current assets, film and television costs, other intangible assets, net and other noncurrent assets, net to adjust to classifications used in the current year as a result of the acquisition of the NBCUniversal businesses.

Earnings Per Share

12 Months Ended

Dec. 31, 2011

Earnings Per Share

Earnings Per Share

Note 3: Earnings Per Share

Basic earnings per common share attributable to Comcast Corporation shareholders (“basic EPS”) is computed by dividing net income attributable to Comcast Corporation by the weighted-average number of common shares outstanding during the period.

Our potentially dilutive securities include potential common shares related to our stock options and our RSUs. Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the option exercise price is greater than the average market price of our Class A common stock or our Class A Special common stock, as applicable.

Diluted EPS for 2011, 2010 and 2009 excludes approximately 45 million, 168 million and 195 million, respectively, of potential common shares related to our share-based compensation plans, because the inclusion of the potential common shares would have had an antidilutive effect.

Computation of Diluted EPS
		2011					2010					2009
Year ended December 31 (in millions, except per share data)		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
Basic EPS attributable to Comcast Corporation shareholders	$	4,160	2,746	$	1.51	$	3,635	2,808	$	1.29	$	3,638	2,875	$	1.27
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			32					12					10
Diluted EPS attributable to Comcast Corporation shareholders	$	4,160	2,778	$	1.50	$	3,635	2,820	$	1.29	$	3,638	2,885	$	1.26

Acquisitions and Other Significant Events

12 Months Ended

Dec. 31, 2011

Acquisitions and Other Significant Events [Abstract]

Acquisitions and Other Significant Events

Year ended December 31 (in millions)			2011		2010
Operating costs and expenses:
	Transaction costs	$	63	$	80
	Transaction-related costs		92		-
Total operating costs and expenses			155		80
Other expense			16		129
Interest expense			-		7
Total		$	171	$	216

Note 4: Acquisitions and Other Significant Events

2011

NBCUniversal Transaction

On January 28, 2011, we closed our transaction with GE to form a new company named NBCUniversal, LLC (“NBCUniversal Holdings”). We now control and own 51% of NBCUniversal Holdings, and GE owns the remaining 49%. As part of the NBCUniversal transaction, GE contributed the businesses of NBCUniversal, which is now a wholly owned subsidiary of NBCUniversal Holdings. The NBCUniversal businesses that were contributed included its national cable networks, the NBC and Telemundo broadcast networks and its NBC and Telemundo owned local television stations, Universal Pictures, the Universal Studios Hollywood theme park, and other related assets. We contributed our national cable networks, our regional sports and news networks, certain of our Internet businesses, including DailyCandy and Fandango, and other related assets (the “Comcast Content Business”). In addition to contributing the Comcast Content Business, we also made a cash payment to GE of $6.2 billion, which included transaction-related costs. We expect to receive tax benefits related to the transaction and have agreed to share with GE certain of these future tax benefits as they are realized.

Under the terms of the operating agreement of NBCUniversal Holdings, during the six month period beginning on July 28, 2014, GE has the right to cause NBCUniversal Holdings to redeem, in cash, half of GE's interest in NBCUniversal Holdings, and we would have the immediate right to purchase the remainder of GE's interest. If, however, we elect not to exercise this right, during the six month period beginning January 28, 2018, GE has the right to cause NBCUniversal Holdings to redeem GE's remaining interest, if any. If GE does not exercise its first redemption right, we have the right, during the six month period beginning January 28, 2016, to purchase half of GE's interest in NBCUniversal Holdings, and during the six month period beginning January 28, 2019, we have the right to purchase GE's remaining interest, if any, in NBCUniversal Holdings. The purchase price to be paid in connection with any purchase or redemption described in this paragraph will be equal to the ownership percentage being purchased multiplied by an amount equal to 120% of the fully distributed public market trading value of NBCUniversal Holdings (determined pursuant to an appraisal process if NBCUniversal Holdings is not then publicly traded), less 50% of an amount (not less than zero) equal to the excess of 120% of the fully distributed public market trading value over $28.4 billion. Subject to various limitations, we are committed to fund up to $2.875 billion in cash or our common stock for each of the two redemptions (up to an aggregate of $5.75 billion) to the extent NBCUniversal Holdings cannot fund the redemptions, with amounts not used in the first redemption to be available for the second redemption.

Until July 28, 2014, GE may not directly or indirectly transfer its interest in NBCUniversal Holdings. Thereafter, GE may transfer its interest to a third party, subject to our right of first offer. The right of first offer would permit us to purchase all, but not less than all, of the interests proposed to be transferred. If GE makes a registration request in accordance with certain registration rights that are granted to it under the agreement, we will have the right to purchase, for cash at the market value (determined pursuant to an appraisal process if NBCUniversal Holdings is not then publicly traded), all of GE's interest in NBCUniversal Holdings that GE is seeking to register.

For so long as GE continues to own at least 20% of NBCUniversal Holdings, GE will have veto rights with respect to certain matters, which include: (i) certain issuances or repurchases of equity; (ii) certain distributions to equity holders; (iii) certain debt incurrences; and (iv) certain loans to or guarantees for other persons made outside of the ordinary course of business.

Allocation of Purchase Price

Because we now control NBCUniversal Holdings, we have applied acquisition accounting to the NBCUniversal contributed businesses and their results of operations are included in our consolidated results of operations following the acquisition date. The net assets of the NBCUniversal contributed businesses were recorded at their estimated fair value primarily using Level 3 inputs (see Note 11 for an explanation of Level 3 inputs). In valuing acquired assets and liabilities, fair value estimates are based on, but are not limited to, future expected cash flows, market rate assumptions for contractual obligations, actuarial assumptions for benefit plans and appropriate discount rates. The Comcast Content Business continues at its historical or carry-over basis. GE's interest in NBCUniversal Holdings is recorded as a redeemable noncontrolling interest in our consolidated financial statements due to the redemption provisions outlined above. GE's redeemable noncontrolling interest has been recorded at fair value for the portion attributable to the net assets we acquired, and at our historical cost for the portion attributable to the Comcast Content Business.

The tables below present the fair value of the consideration transferred and the allocation of purchase price to the assets and liabilities of the NBCUniversal businesses acquired as a result of the NBCUniversal transaction. We have revised our estimates during the year, which resulted in a decrease in goodwill of $1.1 billion from our initial allocation of purchase price. The changes related primarily to revisions in the estimated fair value of investments, property and equipment, and intangible assets.

Consideration Transferred
(in millions)
Cash	$	6,120
Fair value of 49% of the Comcast Content Business		4,308
Fair value of contingent consideration		590
Fair value of redeemable noncontrolling interest associated with net assets acquired		13,071
	$	24,089

Allocation of Purchase Price
(in millions)
Film and television costs (see Note 5)	$	5,049
Investments (see Note 6)		4,339
Property and equipment (see Note7)		2,322
Intangible assets (see Note 8)		14,585
Working capital		(1,734)
Long-term debt (see Note 9)		(9,115)
Deferred income tax liabilities		(35)
Other noncurrent assets and liabilities		(2,005)
Noncontrolling interests acquired		(262)
Fair value of identifiable net assets acquired		13,144
Goodwill (see Note 8)		10,945
	$	24,089

Income Taxes

We are responsible for the tax matters of both NBCUniversal Holdings and NBCUniversal, including the filing of returns and the administering of any proceedings with taxing authorities. See Note 16 for additional information on the partnership structure of NBCUniversal Holdings and NBCUniversal. GE has indemnified us and NBCUniversal Holdings for any income tax liability attributable to the NBCUniversal contributed businesses for periods prior to the acquisition date. We have also indemnified GE and NBCUniversal Holdings for any income tax liability attributable to the Comcast Content Business for periods prior to the acquisition date.

NBCUniversal recognized net deferred income tax liabilities of $35 million in the allocation of purchase price related primarily to acquired intangible assets in state and foreign jurisdictions. In addition, Comcast recognized $576 million of deferred tax liabilities in connection with the NBCUniversal transaction. Because we maintained control of the Comcast Content Business, the excess of fair value received over historical book value and the related tax impact were recorded to additional paid-in capital.

We agreed to share with GE certain tax benefits as they are realized that relate to the form and structure of the transaction. These payments to GE are contingent on us realizing tax benefits in the future and are accounted for as contingent consideration. We have recorded $590 million in other current and noncurrent liabilities in our acquisition accounting based on the present value of the expected future payments to GE.

Following the close of the NBCUniversal transaction, our provision for income taxes includes a federal and state tax provision on our allocable share of the earnings of NBCUniversal Holdings and NBCUniversal, as well as the state, local and foreign tax provisions of NBCUniversal Holdings and NBCUniversal, adjusted for any foreign tax credits.

Contingent Consideration
(in millions)
Balance, January 28, 2011	$	590
Fair value adjustments		29
Payments		(36)
Balance, December 31, 2011	$	583

Goodwill

Goodwill is calculated as the excess of the consideration transferred over the identifiable net assets acquired and represents the future economic benefits expected to arise from other intangible assets acquired that do not qualify for separate recognition, including assembled workforce, noncontractual relationships, and agreements between us and NBCUniversal. Due to the partnership structure of NBCUniversal Holdings, the goodwill is not deductible for tax purposes.

Transaction-Related Expenses

We have incurred significant transaction costs directly related to the NBCUniversal transaction. The incremental expenses related to legal, accounting and valuation services and investment banking fees are included in operating costs and expenses. We also incurred certain financing costs and other shared costs with GE associated with NBCUniversal's debt facilities that were entered into in December 2009 and the issuance of NBCUniversal's senior notes in 2010, which are included in other expense and interest expense. In addition, during 2011, NBCUniversal incurred transaction-related costs associated with severance and other related compensation charges, which are included in operating costs and expenses.

The table below presents the amounts related to these expenses included in our consolidated statement of income.

Universal Orlando Transaction

On July 1, 2011, NBCUniversal acquired the remaining 50% equity interest in Universal City Development Partners, Ltd. (“Universal Orlando”) that it did not already own for $1 billion. Universal Orlando is now a wholly owned consolidated subsidiary of NBCUniversal, the operations of which are reported in our Theme Parks segment. NBCUniversal funded this acquisition with cash on hand, borrowings under its revolving credit facility and a $250 million 1 year note due to us, which was repaid in December 2011.

Preliminary Allocation of Purchase Price

Because we now control Universal Orlando, we have applied acquisition accounting and its results of operations are included in our consolidated results of operations following the acquisition date.

The carrying value of our investment in Universal Orlando on July 1, 2011 was $1 billion, which approximated its fair value and, therefore, no gain or loss was recognized as a result of the acquisition. The estimated fair values of the assets and liabilities acquired are not yet final and are subject to change. We will finalize the amounts recognized as we obtain the information necessary to complete the analysis, but no later than 1 year from the acquisition date.

The table below presents the fair value of the consideration transferred and the preliminary allocation of purchase price to the assets and liabilities of Universal Orlando.

Consideration Transferred
(in millions)
Cash	$	1,019
Fair value of 50% equity method investment in Universal Orlando		1,039
	$	2,058

Preliminary Allocation of Purchase Price
(in millions)
Property and equipment (see Note 7)	$	2,409
Intangible assets (see Note 8)		492
Working capital		242
Long-term debt (see Note 9)		(1,505)
Deferred revenue		(89)
Other noncurrent assets and liabilities		(626)
Noncontrolling interests acquired		(5)
Fair value of identifiable net assets acquired		918
Goodwill (see Note 8)		1,140
	$	2,058

Due to the partnership structure of NBCUniversal Holdings, goodwill is not deductible for tax purposes.

Unaudited Actual and Pro Forma Information

Our consolidated revenue and net income (loss) attributable to Comcast Corporation for the year ended December 31, 2011 included $14.5 billion and $493 million, respectively, from the NBCUniversal contributed businesses.

Our consolidated revenue and net income (loss) attributable to Comcast Corporation for the year ended December 31, 2011 included $712 million and $42 million, respectively, from the acquisition of the remaining 50% equity interest in Universal Orlando.

The following unaudited pro forma information has been presented as if both the NBCUniversal transaction and the Universal Orlando transaction occurred on January 1, 2010. This information is based on historical results of operations, adjusted for the allocation of purchase price and other acquisition accounting adjustments, and is not necessarily indicative of what our results would have been had we operated the businesses since January 1, 2010. No pro forma adjustments have been made for our incremental transaction-related expenses.

Year ended December 31 (in millions except per share amounts)		2011		2010
Revenue	$	57,661	$	55,054
Net income from consolidated operations	$	5,169	$	4,584
Net income attributable to Comcast Corporation	$	4,149	$	3,844
Basic earnings per common share attributable to Comcast Corporation shareholders	$	1.51	$	1.37
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	1.49	$	1.36

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Appendix F
-Paragraph F4
-Subparagraph e

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 67-73
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1490-128463

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7008-128479

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1500-128463

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4926-128472

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4922-128472

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6996-128479

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1524-128463

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1392-128463

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7000-128479

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4934-128472

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1497-128463

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1486-128463

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6972119&loc=d3e1383-128463

+ Details

Film and Television Costs

12 Months Ended

Dec. 31, 2011

Film And Television Costs [Abstract]

Film and Television Costs

Note 5: Film and Television Costs

December 31 (in millions)			2011		2010
Film Costs:
	Released, less amortization	$	1,428	$	-
	Completed, not released		148		-
	In-production and in-development		1,374		-
			2,950		-
Television Costs:
	Released, less amortization		1,002		94
	In-production and in-development		201		43
			1,203		137
Programming rights, less amortization			2,061		445
			6,214		582
Less: Current portion of programming rights			987		122
Film and television costs		$	5,227	$	460

Based on management's estimates of ultimate revenue as of December 31, 2011, approximately $896 million of film and television costs associated with our original film and television productions that are released, or completed and not yet released, are expected to be amortized during 2012. Approximately 89% of unamortized film and television costs for our released productions, excluding amounts allocated to acquired libraries, are expected to be amortized through 2014.

As of December 31, 2011, acquired film and television libraries, which are included within Released, less amortization in the table above, had remaining unamortized costs of approximately $1.0 billion. These costs are generally amortized over a period not to exceed 20 years, and approximately 43% of these costs are expected to be amortized through 2014.

Investments

12 Months Ended

Dec. 31, 2011

Investments

Investments

Note 6: Investments

December 31 (in millions)			2011		2010
Fair Value Method		$	3,028	$	2,815
Equity Method:
	A&E Television Networks		2,021		-
	SpectrumCo		1,417		1,413
	The Weather Channel		463		-
	MSNBC.com		174		-
	Clearwire LLC		69		357
	Other		736		423
			4,880		2,193
Cost Method:
	AirTouch		1,523		1,508
	Other		477		235
			2,000		1,743
Total investments			9,908		6,751
Less: Current investments^(a)			54		81
Noncurrent investments		$	9,854	$	6,670
(a) Current investments are included in other current assets in our consolidated balance sheet.

Fair Value Method

As of December 31, 2011, we held as collateral $3.0 billion of fair value method equity securities related to our obligations under prepaid forward sale agreements, which represents 98.5% of the total fair value method debt and equity securities held as of the balance sheet date. These investments were primarily in Liberty Media-related and Cablevision-related investments. The obligations related to these investments are recorded to other noncurrent liabilities and terminate between 2013 and 2015. At termination, the counterparties are entitled to receive some or all of the equity securities, or an equivalent amount of cash at our option, based on the market value of the equity securities at that time. As of December 31, 2011 and 2010, our prepaid forward sale obligations had an estimated fair value of $2.5 billion and $2.4 billion, respectively.

Equity Method

Equity method investments held as of December 31, 2011 consist primarily of our investments in A&E Television Networks LLC (“A&E Television Networks”) (16%), SpectrumCo, LLC (“SpectrumCo”) (64%), The Weather Channel Holding Corp. (“The Weather Channel”) (25%), MSNBC Interactive News, LLC (“MSNBC.com”) (50%) and Clearwire Communications LLC (“Clearwire LLC”) (6%). NBCUniversal's recorded investments as of December 31, 2011, exceeded their proportionate interests in book value of the investees' net assets by $1.9 billion. The difference in values is primarily related to our investments in A&E Television Networks and MSNBC.com. This difference is amortized in equity in net income (losses) of investees, net over a period of less than 20 years. See below for additional information on certain of our larger equity method investments.

A&E Television Networks

A&E Television Networks consists of, among other channels, A&E, The History Channel, The Biography Channel and Lifetime. The dividends received from A&E Television Networks were approximately 57% of the total cash received from investees during 2011. In the first quarter of 2012 and in other specified future periods, we have the right to require A&E Television Networks to redeem a portion of our equity interest. A&E Television Networks has certain rights to purchase all or a portion of our interest beginning in the third quarter of 2017.

SpectrumCo

SpectrumCo is a joint venture in which we, along with Time Warner Cable and Bright House Networks, are partners. SpectrumCo was the successful bidder for 137 wireless services spectrum licenses for $2.4 billion in the FCC's advanced wireless services spectrum auction that concluded in September 2006. Our portion of the total cost to purchase the licenses was $1.3 billion. We account for this joint venture as an equity method investment based on its governance structure, notwithstanding our majority interest. In December 2011, SpectrumCo entered into an agreement to sell its advanced wireless services spectrum licenses for $3.6 billion, subject to regulatory approval. Our portion of the proceeds is expected to be $2.3 billion and we expect this transaction to close during 2012.

Cost Method

AirTouch Communications, Inc.

We hold two series of preferred stock of AirTouch Communications, Inc. (“AirTouch”), a subsidiary of Vodafone, which are redeemable in April 2020. The estimated fair value of the AirTouch preferred stock was $1.8 billion and $1.7 billion as of December 31, 2011 and 2010, respectively.

The dividend and redemption activity of the AirTouch preferred stock determines the dividend and redemption payments associated with substantially all of the preferred shares issued by one of our consolidated subsidiaries, which is a VIE. The subsidiary has three series of preferred stock outstanding with an aggregate redemption value of $1.75 billion. Substantially all of the preferred shares are redeemable in April 2020 at a redemption value of $1.65 billion. As of both December 31, 2011 and 2010, the two redeemable series of subsidiary preferred shares were recorded at $1.5 billion, and those amounts are included in other noncurrent liabilities. As of December 31, 2011 and 2010, these redeemable subsidiary preferred shares had an estimated fair value of $1.8 billion and $1.7 billion, respectively. The one nonredeemable series of subsidiary preferred shares was recorded at $100 million as of both December 31, 2011 and 2010 and those amounts are included in noncontrolling interests in our consolidated balance sheet. The carrying amounts of the nonredeemable subsidiary preferred shares approximate their fair value.

Investment Income (Loss), Net
Year ended December 31 (in millions)			2011		2010		2009
Gains on sales and exchanges of investments, net		$	41	$	13	$	28
Investment impairment losses			(5)		(24)		(44)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements			192		874		997
Mark to market adjustments on derivative component of prepaid forward sale
	agreements and indexed debt instruments		(119)		(665)		(807)
Interest and dividend income			110		94		102
Other, net			(60)		(4)		6
Investment income (loss), net		$	159	$	288	$	282

Property and Equipment

12 Months Ended

Dec. 31, 2011

Property and Equipment

Property and Equipment

Note 7: Property and Equipment

December 31 (in millions)	Weighted Average Original Useful Life at December 31, 2011		2011		2010
Cable distribution system	11 years	$	28,781	$	27,727
Customer premises equipment	6 years		23,552		21,716
Vehicles and other equipment	6 years		6,001		4,392
Buildings and building improvements	20 years		4,830		1,981
Land	-		923		204
Property and equipment, at cost			64,087		56,020
Less: Accumulated depreciation			36,528		32,505
Property and equipment, net		$	27,559	$	23,515

- Definition

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

+ References + Details

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill and Other Intangible Assets [Abstract]

Goodwill and Other Intangible Assets

Note 8: Goodwill and Other Intangible Assets

Goodwill
			NBCUniversal
(in millions)		Cable Communications		Cable Networks		Broadcast Television		Filmed Entertainment		Theme Parks		Corporate and Other		Total
Balance, December 31, 2009	$	12,128	$	2,628	$	-	$	-	$	-	$	177	$	14,933
Acquisitions		81		13		-		-		-		10		104
Impairments		-		(76)		-		-		-		-		(76)
Settlements and adjustments		(2)		(1)		-		-		-		-		(3)
Balance, December 31, 2010		12,207		2,564		-		-		-		187		14,958
Acquisitions		-		10,180		772		1		1,140		-		12,093
Dispositions		-		-		-		-		-		(174)		(174)
Settlements and adjustments		1		-		-		-		-		(4)		(3)
Balance, December 31, 2011	$	12,208	$	12,744	$	772	$	1	$	1,140	$	9	$	26,874

Other Intangible Assets

The gross carrying amount and accumulated amortization of our intangible assets are presented in the table below.

				2011				2010
December 31 (in millions)		Original Useful Life at December 31, 2011		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-Lived Intangible Assets:
	Customer relationships	4-20 years	$	15,079	$	(3,387)	$	6,968	$	(5,548)
	Cable franchise renewal costs and contractual operating rights	5-15 years		1,152		(581)		1,077		(608)
	Software	3-5 years		3,234		(1,839)		2,594		(1,624)
	Patents and other technology rights	3-12 years		344		(256)		307		(207)
	Other agreements and rights	3-36 years		1,379		(602)		1,272		(853)
Indefinite-Lived Intangible Assets:
	Trade names	N/A		3,006				53
	FCC licenses	N/A		636				-
Total			$	24,830	$	(6,665)	$	12,271	$	(8,840)

In 2011, the increase in the gross carrying amount is related to the close of the NBCUniversal and Universal Orlando transactions. The intangible assets recorded as a result of the NBCUniversal transaction include finite-lived intangible assets, primarily customer relationships with multichannel video providers and advertisers, and indefinite-lived intangible assets, primarily trade names and FCC licenses. The intangible assets recorded as a result of the Universal Orlando transaction primarily consist of the rights to use certain characters and trademarks in our theme parks. These increases were partially offset by a decrease in the gross carrying amount and accumulated amortization due to the write-off of fully amortized customer relationships and other intangible assets in our Cable Communications segment.

The estimated expenses for each of the next 5 years to be recognized in amortization expense are presented in the table below.

(in millions)		Amortization Expense
2012	$	1,512
2013	$	1,315
2014	$	1,134
2015	$	997
2016	$	805

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt

12 Months Ended

Dec. 31, 2011

Long-term Debt

Long-Term Debt

Note 9: Long-Term Debt

December 31 (in millions)	Weighted Average Interest Rate as of December 31, 2011			2011		2010
Commercial paper	0.508	%	$	550	$	-
Senior notes with maturities of 5 years or less	5.829	%		11,347		8,145
Senior notes with maturities between 6 and 10 years	5.512	%		10,689		8,381
Senior notes with maturities greater than 10 years^(a)	6.780	%		16,115		14,258
Other, including capital lease obligations	—			608		631
Total debt	5.89	%^(b)		39,309		31,415
Less: Current portion				1,367		1,800
Long-term debt			$	37,942	$	29,615
(a) The December 31, 2011 and 2010 amounts include £625 million of 5.50% notes due 2029 translated at $969 million and $976 million, respectively, using the exchange rates at these dates.
(b) Includes the effects of our derivative financial instruments.

As of December 31, 2011 and 2010, our debt had an estimated fair value of $45.1 billion and $34.3 billion, respectively. The estimated fair value of our publicly traded debt is based on quoted market values for the debt. To estimate the fair value of debt for which there are no quoted market prices, we use interest rates available to us for debt with similar terms and remaining maturities.

Some of our loan agreements require that we maintain certain financial ratios based on our debt and our operating income before depreciation and amortization. We were in compliance with all financial covenants for all periods presented. See Note 22 for additional information on our subsidiary guarantee structures.

As of December 31, 2011 and 2010, accrued interest on our debt was $612 million and $524 million, respectively, which is included in accrued expenses and other current liabilities..

As of the close of the NBCUniversal transaction on January 28, 2011, we consolidated $9.1 billion of NBCUniversal senior debt securities with maturities ranging from 2014 to 2041. We do not guarantee NBCUniversal's debt obligations. On July 1, 2011, we consolidated $1.5 billion of long-term debt obligations as a result of the Universal Orlando transaction. In accordance with acquisition accounting, these debt securities were recorded at fair value as of the respective acquisition dates. Borrowings under the NBCUniversal revolving credit facility, along with cash on hand at Universal Orlando, were used to terminate Universal Orlando's existing $801 million term loan immediately following the acquisition. In addition, on August 1, 2011, Universal Orlando redeemed $140 million aggregate principal amount of its 8.875% senior notes due 2015 and $79 million aggregate principal amount of its 10.875% senior subordinated notes due 2016. As of December 31, 2011, the carrying value on our consolidated balance sheet of Universal Orlando's senior notes and senior subordinated notes was $418 million.

Debt Maturities
December 31, 2011 (in millions)
2012	$	1,367
2013	$	2,411
2014	$	1,992
2015	$	3,660
2016	$	2,951
Thereafter	$	26,928

Debt Repayments and Repurchases
Year ended December 31, 2011 (in millions)
Comcast 6.75% notes due 2011	$	1,000
Comcast 5.5% notes due 2011		750
Universal Orlando term loan		801
Comcast 7% notes due 2055		345
Universal Orlando 8.875% notes due 2015		140
Universal Orlando 10.875% notes due 2016		79
Other		101
Total	$	3,216

During the first quarter of 2012, we plan to redeem $563 million principal amount of our $1.1 billion aggregate principal amount of 7% senior notes due 2055.

Debt Instruments

Commercial Paper Programs

Our commercial paper programs provide a lower cost source of borrowing to fund our short-term working capital requirements and are supported by our revolving credit facilities. Comcast has a maximum borrowing capacity of $2.25 billion and NBCUniversal has a maximum borrowing capacity of $1.5 billion. As of December 31, 2011, NBCUniversal had $550 million face amount of commercial paper outstanding. The proceeds from NBCUniversal's issuances of commercial paper, along with cash from operations, were used to repay the borrowings under the NBCUniversal revolving credit facility and fund NBCUniversal's short-term working capital requirements.

Revolving Credit Facilities

As of December 31, 2011, Comcast and Comcast Cable Communications, LLC had a $6.8 billion revolving credit facility due January 2013 with a syndicate of banks. The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on Comcast's credit rating. As of December 31, 2011, the borrowing margin for LIBOR-based borrowings was 0.35%. As of December 31, 2011, amounts available under this facility totaled approximately $6.5 billion.

As of December 31, 2011, NBCUniversal had a $1.5 billion revolving credit facility due June 2016 with a syndicate of banks. The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on NBCUniversal's credit rating. As of December 31, 2011, the borrowing margin for LIBOR-based borrowings was 1.125%. As of December 31, 2011, amounts available under this facility totaled $934 million.

Letters of Credit

As of December 31, 2011, we and certain of our subsidiaries had unused irrevocable standby letters of credit totaling $552 million to cover potential fundings under various agreements.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Derivative Financial Instruments

12 Months Ended

Dec. 31, 2011

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 10: Derivative Financial Instruments

We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in interest rates, foreign exchange rates and equity prices.

We manage our exposure to fluctuations in interest rates by using derivative financial instruments such as interest rate exchange agreements (“swaps”), interest rate lock agreements (“rate locks”) and interest rate collars (“collars”). We sometimes enter into rate locks or collars to hedge the risk that the cash flows related to the interest payments on an anticipated issuance or assumption of fixed-rate debt may be adversely affected by interest rate fluctuations.

For NBCUniversal's recognized balance sheet amounts denominated in foreign currency, anticipated foreign currency denominated production costs and rights, and anticipated international content-related revenue and royalties, we manage our exposure to fluctuations in foreign exchange rates by using foreign exchange contracts such as forward contracts and currency options. For our foreign currency denominated borrowings, we manage our exposure to fluctuations in foreign exchange rates by using cross-currency swaps, effectively converting these borrowings to U.S. dollar denominated borrowings.

We manage our exposure to and benefits from price fluctuations in the common stock of some of our investments by using equity derivative financial instruments embedded in other contracts, such as prepaid forward sale agreements, whose values, in part, are derived from the market value of certain publicly traded common stock.

We manage the credit risks associated with our derivative financial instruments through diversification and the evaluation and monitoring of the creditworthiness of the counterparties. Although we may be exposed to losses in the event of nonperformance by the counterparties, we do not expect such losses, if any, to be significant. We have agreements with certain counterparties that include collateral provisions. These provisions require a party with an aggregate unrealized loss position in excess of certain thresholds to post cash collateral for the amount in excess of the threshold. The threshold levels in our collateral agreements are based on our and the counterparties' credit ratings. As of December 31, 2011 and 2010, neither we nor any of the counterparties were required to post collateral under the terms of the agreements.

As of December 31, 2011, our derivative financial instruments designated as hedges included (i) our interest rate swap agreements, which are recorded to other current or noncurrent assets, (ii) certain of our foreign exchange contracts, which are recorded to other current assets or accrued expenses and other current liabilities, (iii) our cross-currency swaps, which are recorded to other noncurrent liabilities, and (iv) the derivative component of one of our prepaid forward sale agreements, which is recorded to other noncurrent liabilities.

As of December 31, 2011, our derivative financial instruments not designated as hedges were (i) certain of our foreign exchange contracts, which are recorded to other current assets or accrued expenses and other current liabilities, (ii) the derivative components of our indexed debt instruments, which are recorded to long-term debt, and (iii) the derivative components of certain of our prepaid forward sale agreements, which are recorded to other noncurrent liabilities.

See Note 11 for additional information on the fair values of our derivative financial instruments as of December 31, 2011 and 2010.

Fair Value Hedges

For derivative financial instruments designated as fair value hedges of interest rate risk, such as fixed to variable swaps, changes in the fair value of the derivative financial instrument substantially offset changes in the fair value of the underlying debt, each of which is recorded to interest expense. Using swaps, we agree to exchange, at specified dates, the difference between fixed and variable interest amounts calculated by reference to an agreed-upon notional principal amount.

Terms of Outstanding Fixed to Variable Swaps
December 31 (in millions)		2011			2010
Maturities		2012-2018			2011-2018
Notional amount	$	4,500		$	5,300
Average pay rate		4.1	%		4.8	%
Average receive rate		6.2	%		6.6	%
Estimated fair value	$	280		$	273

The notional amounts presented in the table above are used to measure interest to be paid or received and do not represent the amount of exposure to credit loss. Average pay rate is estimated using the average implied LIBOR through the year of maturity based on the yield curve in effect plus the applicable borrowing margin at the end of the period. The estimated fair value in the table above represents the approximate amount of net proceeds required to settle the contracts, including accrued interest of $34 million and $41 million as of December 31, 2011 and 2010, respectively.

For derivative financial instruments designated as fair value hedges of equity price risk, such as the derivative component of a prepaid forward sale agreement, changes in the fair value of the derivative financial instrument substantially offset changes in the fair value of the underlying investment, each of which is recorded to investment income (loss), net. As of December 31, 2011 and 2010, the fair value of our prepaid forward sale agreement designated as a fair value hedge was an asset of $4 million and a liability of $29 million, respectively.

Amount of Gain (Loss) Recognized in Income
Year ended December 31 (in millions)		2011		2010
Interest Income (Expense):
Interest rate swap agreements (fixed to variable)	$	15	$	90
Long-term debt — interest rate swap agreements (fixed to variable)		(15)		(90)
Investment Income (Loss), Net:
Mark to market adjustments on derivative component of prepaid forward sale agreements		32		(49)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements		(48)		74
Gain (loss) on fair value hedging relationships	$	(16)	$	25

Cash Flow Hedges

For derivative financial instruments designated as cash flow hedges of interest rate risk, such as variable to fixed swaps, rate locks and collars, the effective portion of the hedge is reported in accumulated other comprehensive income (loss) and recognized as an adjustment to interest expense over the period in which the related interest cost is recognized in earnings. When hedged variable-rate debt is settled prior to maturity, any remaining unrealized gain or loss from the hedge is recognized in interest expense in a manner similar to debt extinguishment costs. When hedged forecasted debt issuances become probable of not occurring, any unrealized gain or loss is recognized in other income (expense).

For derivative financial instruments designated as cash flow hedges of foreign exchange risk, such as forward contracts, currency options and cross-currency swaps, the effective portion of the hedge is reported in accumulated other comprehensive income (loss). These amounts are recognized as an adjustment to earnings in the period in which the effects of the remeasurement of changes in exchange rates on the foreign currency denominated hedged items are recognized in earnings. When foreign currency denominated hedged items are settled, any remaining unrealized gain or loss from the hedge is recognized in earnings.

Pretax Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income
	2011							2010
Year ended December 31 (in millions)		Interest Rate Risk		Foreign Exchange Risk		Total		Interest Rate Risk		Foreign Exchange Risk		Total
Deferred gain (loss) recognized	$	-	$	(40)	$	(40)	$	(98)	$	(29)	$	(127)
Deferred (gain) loss reclassified to income^(a)		23		8		31		34		21		55
Total change in accumulated other comprehensive income	$	23	$	(32)	$	(9)	$	(64)	$	(8)	$	(72)
(a) The interest rate risk amount in 2010 includes an $18 million loss related to a forecasted debt issuance that did not occur.

Interest rate risk deferred losses relate to interest rate lock and collar agreements entered into to fix the interest rates of certain of our debt obligations in advance of their issuance. Unless we retire this debt early, these unrealized losses will be reclassified as an adjustment to interest expense, primarily through 2022, in the period in which the related interest expense is recognized in earnings. The foreign exchange risk deferred losses for 2011 relate to cross-currency swap agreements on foreign currency denominated debt due 2029 and foreign exchange contracts with initial maturities generally not exceeding 1 year and up to 18 months in certain circumstances. The amount of unrealized gains and losses expected to be reclassified to earnings over the next 12 months was not material as of December 31, 2011. See Note 14 for the components of accumulated other comprehensive income (loss).

Ineffectiveness related to our cash flow hedges was not material for 2011 or 2010.

Nondesignated Derivative Financial Instruments

In 2011, 2010 and 2009, certain derivative financial instruments relating to foreign exchange risk, equity price risk and interest rate risk were not designated as fair value or cash flow hedges. Changes in fair value for these instruments are recognized on a current basis in earnings.

For equity derivative financial instruments embedded in other contracts, such as a prepaid forward sale agreement, we separate the derivative component from the host contract. The derivative component is recorded at its estimated fair value in our consolidated balance sheet and changes in its value are recorded each period to investment income (loss), net.

Amount of Gain (Loss) Recognized in Income
Year ended December 31 (in millions)			2011		2010
Operating Costs and Expenses:
	Mark to market adjustments on foreign exchange contracts	$	(3)	$	-
Investment Income (Loss), Net:
	Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments		(151)		(616)
Other Income (Expense), Net:
	Mark to market adjustments on interest rate collars		-		15
Total gain (loss)		$	(154)	$	(601)

As of December 31, 2011, our nondesignated derivative financial instruments related to foreign exchange risk had a total notional value of $719 million. The notional amount is a measure of the activity related to our risk exposure and does not represent the amount of exposure to credit loss or market loss, or reflect the gains or losses associated with the exposures and transactions that the foreign exchange contracts are intended to offset. The amounts ultimately realized upon settlement of these derivative financial instruments, together with the gains and losses on the underlying exposures, will depend on actual market conditions during the remaining life of the derivative financial instruments.

- Definition

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80784-113994

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4E
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624181-113959

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624177-113959

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624258-113959

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708775-113959

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41635-113959

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708773-113959

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

+ Details

Fair Value Measurements

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Measurements

Note 11: Fair Value Measurements

The accounting guidance related to financial assets and financial liabilities (“financial instruments”) establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below.

Level 1: Consists of financial instruments whose values are based on quoted market prices for identical financial instruments in an active market.
Level 2: Consists of financial instruments that are valued using models or other valuation methodologies. These models use inputs that are observable either directly or indirectly. Level 2 inputs include (i) quoted prices for similar assets or liabilities in active markets, (ii) quoted prices for identical or similar assets or liabilities in markets that are not active, (iii) pricing models whose inputs are observable for substantially the full term of the financial instrument and (iv) pricing models whose inputs are derived principally from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument.
Level 3: Consists of financial instruments whose values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of financial instruments and their classification within the fair value hierarchy. Financial instruments are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. There have been no changes in the classification of any financial instruments within the fair value hierarchy in the periods presented. Our financial instruments that are accounted for at fair value on a recurring basis are presented in the table below.

Recurring Fair Value Measures
		Fair Value as of December 31, 2011								Fair Value as of December 31, 2010
(in millions)		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Trading securities	$	2,895	$	-	$	-	$	2,895	$	2,688	$	-	$	-	$	2,688
Available-for-sale securities		90		20		21		131		126		-		-		126
Equity warrants		-		-		2		2		-		-		1		1
Interest rate swap agreements		-		246		-		246		-		232		-		232
Foreign exchange contracts		-		10		-		10		-		-		-		-
	$	2,985	$	276	$	23	$	3,284	$	2,814	$	232	$	1	$	3,047
Liabilities
Derivative component of prepaid forward sale agreements and indexed debt instruments	$	-	$	1,234	$	-	$	1,234	$	-	$	1,029	$	-	$	1,029
Contingent consideration		-		-		583		583		-		-		-		-
Contractual obligations		-		-		1,004		1,004		-		-		-		-
Cross-currency swap agreements		-		69		-		69		-		29		-		29
Foreign exchange contracts		-		8		-		8		-		-		-		-
	$	-	$	1,311	$	1,587	$	2,898	$	-	$	1,058	$	-	$	1,058

Our financial instruments included in Level 3 primarily consist of contingent considerations and contractual obligations assumed as a result of the NBCUniversal and Universal Orlando transactions. See Note 4 and 19 for additional information on these obligations.

We have assets and liabilities required to be recorded at fair value on a nonrecurring basis when certain circumstances occur. In the case of film production costs, upon the occurrence of an event or change in circumstance that may indicate that the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film's fair value. The estimate of fair value of a film production is determined using Level 3 inputs, primarily an analysis of future expected cash flows. Impairment charges of $57 million were recorded in 2011 as a result of this analysis. In 2010, we recorded impairment charges to goodwill of $76 million in our Cable Networks segment representing the amount of excess of a reporting unit's carrying amount of goodwill over its implied fair value, which was determined using Level 3 measures.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13504-108611

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Noncontrolling Interests

12 Months Ended

Dec. 31, 2011

Noncontrolling Interests [Abstract]

Noncontrolling Interests

Note 12: Noncontrolling Interests

Certain of the subsidiaries that we consolidate are not wholly owned. Some of the agreements with the minority partners of these subsidiaries contain redemption features whereby interests held by the minority partners are redeemable either (i) at the option of the holder or (ii) upon the occurrence of an event that is not solely within our control. If interests were to be redeemed under these agreements, we would generally be required to purchase the interest at fair value on the date of redemption. These interests are presented on the balance sheet outside of equity under the caption “Redeemable noncontrolling interests.” Noncontrolling interests that do not contain such redemption features are presented in equity.

In connection with the NBCUniversal transaction in January 2011, GE obtained a 49% indirect noncontrolling interest in the Comcast Content Business in exchange for a portion of our interest in NBCUniversal Holdings. The difference between the fair value of the interest we received and the historical carrying value of the noncontrolling interest in the Comcast Content Business resulted in an increase of $1.7 billion, net of taxes, to additional paid-in capital of Comcast Corporation.

GE's 49% interest in NBCUniversal Holdings is recorded as a redeemable noncontrolling interest in our consolidated financial statements due to the redemption provisions discussed in Note 4. The initial value for the redeemable noncontrolling interest was based on the fair value for the portion attributable to the net assets of the NBCUniversal businesses we acquired and our historical cost for the portion attributable to the Comcast Content Business. We adjust GE's redeemable noncontrolling interest for its 49% interest in NBCUniversal Holdings' and NBCUniversal's earnings and changes in other comprehensive income, as well as for other capital transactions attributable to GE. The carrying amount of GE's redeemable noncontrolling interest was in excess of the redemption value as of December 31, 2011.

The table below presents the changes in equity resulting from net income attributable to Comcast Corporation and transfers to or from noncontrolling interests.

Year ended December 31 (in millions)				2011		2010
Net income attributable to Comcast Corporation			$	4,160	$	3,635
Transfers from (to) noncontrolling interests:
	Increase in Comcast Corporation additional paid-in capital resulting from the issuance
		of noncontrolling equity interest		1,650		-
	Increase in Comcast Corporation additional paid-in capital resulting from the purchase
		of noncontrolling interest		-		11
Changes in equity resulting from net income attributable to Comcast Corporation and
	transfers from (to) noncontrolling interests		$	5,810	$	3,646

- Definition

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

+ References + Details

Postretirement, Pension and Other Employee Benefit Plans

12 Months Ended

Dec. 31, 2011

Postretirement, Pension and Other Employee Benefit Plans

Postretirement, Pension and Other Employee Benefit Plans

Note 13: Postretirement, Pension and Other Employee Benefit Plans

Postretirement Benefit Plans

The Comcast Postretirement Healthcare Stipend Program (the “stipend plan”) covers substantially all of our employees, other than those of NBCUniversal, who meet certain age and service requirements. The stipend plan provides an annual stipend for reimbursement of healthcare costs to each eligible employee based on years of service. Under the stipend plan, we are not exposed to the increasing costs of healthcare because the benefits are fixed at a predetermined amount. A small number of eligible employees participate in legacy plans of acquired companies.

Following the close of the NBCUniversal transaction on January 28, 2011, NBCUniversal established new postretirement medical and life insurance plans for its employees. The plans that were established provide continuous coverage to employees eligible to receive such benefits and give credit for length of service provided before the close of the NBCUniversal transaction. Certain covered employees also retain the right, following retirement, to elect to participate in corresponding plans sponsored by GE. To the extent that NBCUniversal's employees make such elections, NBCUniversal will reimburse GE for any amounts due. NBCUniversal did not, however, assume any obligation for benefits due to employees who were retirees at the time of the close of the NBCUniversal transaction and were eligible to receive benefits under GE's postretirement benefit plans.

All of our postretirement benefit plans are unfunded and substantially all of our postretirement benefit obligations are recorded to noncurrent liabilities.

Pension Plans

Following the close of the NBCUniversal transaction on January 28, 2011, NBCUniversal established new defined benefit pension plans. NBCUniversal's qualified plan and nonqualified plan provide a lifetime income benefit based on an individual's length of service and related compensation. The qualified plan does not give credit to eligible participants for the length of service provided before the close of the NBCUniversal transaction and is not open to new participants. The nonqualified plan gives credit to eligible participants for the length of service provided before the close of the NBCUniversal transaction to the extent that participants did not vest in a supplemental pension plan sponsored by GE. NBCUniversal also assumed certain liabilities related to its obligation to reimburse GE for future benefit payments to those participants that were vested in the supplemental pension plan sponsored by GE at the time of the close of the NBCUniversal transaction. NBCUniversal expects to begin funding the qualified plan with contributions of approximately $100 million in 2012. The nonqualified plan is unfunded.

The tables below provide information on the changes in our projected benefit obligations, the funded status and the components of our benefit expense for our active postretirement benefit and pension plans.

			2011						2010			2009
Year ended December 31 (in millions)			Postretirement Benefits			Pension Benefits			Postretirement Benefits			Postretirement Benefits
Projected benefit obligation, beginning of the year		$	424		$	-		$	360		$	338
Projected benefit obligation, close of the NBCUniversal
	transaction		154			249			-			-
Service cost			19			99			31			27
Interest cost			30			12			21			20
Actuarial (gain) loss			(1)			71			16			(20)
Benefits paid			(8)			(4)			(4)			(5)
Projected benefit obligation, end of the year		$	618		$	427		$	424		$	360

Accumulated benefit obligation, end of the year		$	618		$	395		$	424		$	360
Plan funded status and recorded benefit obligation		$	(618)		$	(427)		$	(424)		$	(360)
Portion of benefit obligation not yet recognized in benefits
	expense	$	(17)		$	71		$	(18)		$	(36)
Discount rate			4.75	%		4.75-5.25	%		5.50	%		6.05	%

		2011				2010		2009
Year ended December 31 (in millions)		Postretirement Benefits		Pension Benefits		Postretirement Benefits		Postretirement Benefits
Service cost	$	19	$	99	$	31	$	27
Interest cost		30		12		21		20
Amortization		(2)		-		(2)		(2)
Total benefits expense	$	47	$	111	$	50	$	45

Expected Future Benefit Payments
(in millions)		Postretirement Benefits		Pension Benefits
2012	$	14	$	9
2013	$	16	$	11
2014	$	19	$	13
2015	$	21	$	16
2016	$	23	$	19
2017 - 2021	$	148	$	183

We also sponsor a qualified and a nonqualified pension plan that together provide benefits to former AT&T Broadband employees. Future benefits for both plans have been frozen. On December 30, 2011, we provided notice to plan participants of our intent to terminate the qualified pension plan effective February 29, 2012. We will seek approval from both the Internal Revenue Service (“IRS”) and Pension Benefit Guaranty Corporation before settling the plan. It is expected that final approval will be received in 2013, at which point we will fully fund the plan and settle all plan obligations.

The table below provides condensed information on our frozen pension benefit plans.

Year ended December 31 (in millions)		2011		2010			2009
Benefit obligation	$	211		$	197		$	184
Fair value of plan assets	$	176		$	183		$	176
Plan funded status and recorded benefit obligation	$	(35)		$	(14)		$	(8)
Portion of benefit obligation not yet recognized in benefit expense	$	66		$	51		$	46
Benefits expense	$	6		$	1		$	2
Discount rate		4.75	%		5.25	%		5.75	%
Expected return on plan assets		6.50	%		8.00	%		8.00	%

Other Employee Benefits

Multiemployer Benefit Plans

We also participate in various multiemployer pension and other benefit plans covering some of our employees who are represented by labor unions. We make periodic contributions to these plans in accordance with the terms of applicable collective bargaining agreements and laws but do not sponsor or administer these plans. We do not participate in any multiemployer benefit plans where we consider our contributions to be individually significant and the largest plans in which we participate are funded at a level of 80 percent or greater. The total contributions we made to multiemployer benefit plans were $42 million during 2011.

If we cease to be obligated to make contributions or otherwise withdraw from participation in one of these plans, applicable law requires us to fund our allocable share of the unfunded vested benefits, referred to as a withdrawal liability. In addition, actions taken by other participating employers may lead to adverse changes in the financial condition of a multiemployer benefit plan and our withdrawal liability may increase.

Deferred Compensation Plans

We maintain unfunded, nonqualified deferred compensation plans for certain members of management and nonemployee directors (each, a “participant”). The amount of compensation deferred by each participant is based on participant elections. Participant accounts, except for those in the NBCUniversal plan, are credited with income primarily based on a fixed annual rate. Participants in the NBCUniversal plan designate one or more valuation funds, independently established funds or indices, which are used to determine the amount of earnings to be credited or debited to the participant's account. Participants are eligible to receive distributions of the amounts credited to their account based on elected deferral periods that are consistent with the plans and applicable tax law. The table below presents the benefit obligation and expenses related to our deferred compensation plans.

Year ended December 31 (in millions)		2011		2010		2009
Benefit obligation	$	1,059	$	935	$	849
Interest expense	$	99	$	88	$	79

We have purchased life insurance policies to fund a portion of the unfunded obligation related to our deferred compensation plans. As of December 31, 2011 and 2010, the cash surrender value of these policies, which is recorded to other noncurrent assets, was approximately $409 million and $373 million, respectively.

Split-Dollar Life Insurance Agreements

We have collateral assignment split-dollar life insurance agreements with select key employees that require us to incur certain insurance-related costs. Under some of these agreements, our obligation to provide benefits to the employees extends beyond retirement.

The table below presents the benefit obligation and expense related to our split-dollar life insurance agreements.

Year ended December 31 (in millions)		2011		2010		2009
Benefit obligation	$	169	$	164	$	166
Operating costs and expenses	$	27	$	16	$	37

Retirement Investment Plans

We sponsor several 401(k) defined contribution retirement plans that allow eligible employees to contribute a portion of their compensation through payroll deductions in accordance with specified plan guidelines. We match a percentage of the employees' contributions up to certain limits. In 2011, 2010 and 2009, expenses related to these plans amounted to $226 million, $152 million and $182 million, respectively.

Severance Benefits

We provide severance benefits to certain former employees. A liability is recorded for benefits provided when payment is probable, the amount is reasonably estimable, and the obligation relates to rights that have vested or accumulated. During 2011, 2010 and 2009, we recorded $128 million, $67 million and $81 million, respectively, of severance costs. The increase in severance costs in 2011 was primarily related to the NBCUniversal transaction.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

+ Details

Equity

12 Months Ended

Dec. 31, 2011

Equity

Equity

Note 14: Equity

Common Stock

In the aggregate, holders of our Class A common stock have 66 2/3% of the voting power of our common stock and holders of our Class B common stock have 331/3% of the voting power of our common stock. Our Class A Special common stock is generally nonvoting. Each share of our Class B common stock is entitled to 15 votes. The number of votes held by each share of our Class A common stock depends on the number of shares of Class A and Class B common stock outstanding at any given time. The 331/3% aggregate voting power of our Class B common stock cannot be diluted by additional issuances of any other class of common stock. Our Class B common stock is convertible, share for share, into Class A or Class A Special common stock, subject to certain restrictions.

Share Repurchases

In 2011, we completed our share repurchases under our 2007 Board of Directors $7 billion share repurchase authorization.

In February 2012, our Board of Directors approved a $6.5 billion share repurchase authorization, which does not have an expiration date. Under this authorization, we may repurchase shares in the open market or in private transactions.

Share Repurchases
Year ended December 31 (in millions)		2011		2010		2009
Consideration	$	2,141	$	1,200	$	765
Shares repurchased		95		70		50

Changes in Common Stock Outstanding
(shares in millions)	A	A Special	B
Balance, January 1, 2009	2,061	810	9
Stock compensation plans	3	-	-
Repurchase and retirement of common stock	(5)	(45)	-
Employee stock purchase plan	4	-	-
Balance, December 31, 2009	2,063	765	9
Stock compensation plans	6	-	-
Repurchase and retirement of common stock	-	(70)	-
Employee stock purchase plan	3	-	-
Balance, December 31, 2010	2,072	695	9
Stock compensation plans	20	1	-
Repurchase and retirement of common stock	-	(95)	-
Employee stock purchase plan	3	-	-
Balance, December 31, 2011	2,095	601	9

Dividends

2011 Dividends Declared
Year ended December 31, 2011 (in millions, except per share amounts)
Month Declared		Per Share		Amount
January	$	0.1125	$	312
May		0.1125		309
July		0.1125		307
October (paid in January 2012)		0.1125		305
Total	$	0.45	$	1,233

2010 Dividends Declared
Year ended December 31, 2010 (in millions, except per share amounts)
Month Declared		Per Share		Amount
February	$	0.0945	$	267
May		0.0945		265
July		0.0945		264
October (paid in January 2011)		0.0945		263
Total	$	0.378	$	1,059

In February 2012, our Board of Directors approved an increase of 44% to $0.65 per share on an annualized basis and approved the first quarterly dividend of $0.1625 per share to be paid in April 2012.

Accumulated Other Comprehensive Income (Loss)

The table below presents the components of our accumulated other comprehensive income (loss), net of deferred taxes.

December 31 (in millions)		2011		2010
Unrealized gains (losses) on marketable securities	$	22	$	26
Deferred gains (losses) on cash flow hedges		(110)		(105)
Unrecognized gains (losses) on employee benefit obligations		(58)		(19)
Cumulative translation adjustments		(6)		(1)
Accumulated other comprehensive income (loss), net of deferred taxes	$	(152)	$	(99)

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Share-Based Compensation

12 Months Ended

Dec. 31, 2011

Share-Based Compensation

Share-Based Compensation

Note 15: Share-Based Compensation

Our approach to long-term incentive compensation includes the awarding of stock options and RSUs to certain employees and directors. We grant these awards under various plans. Additionally, through our employee stock purchase plans, employees are able to purchase shares of Comcast Class A common stock at a discount through payroll deductions.

Recognized Share-Based Compensation Expense
Year ended December 31 (in millions)		2011		2010		2009
Stock options	$	116	$	103	$	103
Restricted share units		149		136		93
Employee stock purchase plans		13		12		13
Total	$	278	$	251	$	209
Tax benefit	$	98	$	89	$	73

As of December 31, 2011, we had unrecognized pretax compensation expense of $317 million related to nonvested stock options and unrecognized pretax compensation expense of $327 million related to nonvested RSUs that will be recognized over a weighted-average period of approximately 2.0 years and 1.8 years, respectively. The amount of share-based compensation capitalized was not material to our consolidated financial statements for the periods presented.

When stock options are exercised or RSU awards are settled through the issuance of shares, any income tax benefit realized in excess of the amount previously recognized for financial reporting purposes associated with compensation expense is presented as a financing activity rather than as an operating activity in our consolidated statement of cash flows. In 2011 and 2010, the excess cash income tax benefit classified as a financing cash inflow was approximately $46 million and $4 million, respectively. In 2009, there was no excess cash income tax benefit classified as a financing cash inflow.

Option Plans

We maintain stock option plans for certain employees under which fixed-price stock options may be granted and the option price is generally not less than the fair value of a share of the underlying stock on the date of grant. Under our stock option plans, a combined total of approximately 241 million shares of our Class A and Class A Special common stock are reserved for the exercise of stock options, including options outstanding as of December 31, 2011. Option terms are generally 10 years, with options generally becoming exercisable within 5 years from the date of grant.

We use the Black-Scholes option pricing model to estimate the fair value of each stock option on the date of grant. The Black-Scholes option pricing model uses the assumptions summarized in the table below. Dividend yield is based on the yield on the date of grant. Expected volatility is based on a blend of implied and historical volatility of our Class A common stock. The risk-free rate is based on the U.S. Treasury yield curve in effect on the date of grant. We use historical data on the exercise of stock options and other factors expected to impact holders' behavior to estimate the expected term of the options granted.

The table below presents the weighted-average fair value on the date of grant of a Class A common stock option awarded under our stock option plans and the related weighted-average valuation assumptions.

		2011			2010			2009
Fair value	$	6.96		$	5.11		$	4.93
Dividend yield		1.8	%		2.1	%		1.9	%
Expected volatility		28.1	%		28.0	%		36.8	%
Risk-free interest rate		2.8	%		3.4	%		2.4	%
Expected option life (in years)		7.0			7.0			7.0

In 2007, we began granting net settled stock options instead of stock options exercised with a cash payment (“cash settled stock options”). The change to net settled stock options results in fewer shares being issued and no cash proceeds being received by us when a net settled option is exercised.

2011 Stock Option Activity
(in thousands, except per share amounts and years)		Net Settled Options		Cash Settled Options		Weighted-Average Exercise Price	Weighted-Average Remaining Contractual Term
Class A Common Stock
Outstanding as of January 1, 2011		125,358		27,037	$	18.74
Granted		25,700		-	$	24.98
Exercised		(15,081)		(10,472)	$	18.99
Forfeited		(5,773)		(21)	$	19.19
Expired		(25)		(2,987)	$	22.47
Outstanding as of December 31, 2011		130,179		13,557	$	19.71	6.2
Weighted-average exercise price, as of December 31, 2011	$	19.75	$	19.30
Exercisable as of December 31, 2011		44,638		13,160	$	19.55	4.0
Weighted-average exercise price, as of December 31, 2011	$	19.63	$	19.27
Weighted-average remaining contractual term		4.5		2.4
Class A Special Common Stock
Outstanding as of January 1, 2011		13,963		6,557	$	22.82
Exercised		(1,905)		(833)	$	19.93
Forfeited		-		(2)	$	14.27
Expired		(5,396)		(2,539)	$	24.93
Outstanding as of December 31, 2011		6,662		3,183	$	21.92	0.2
Weighted-average exercise price, as of December 31, 2011	$	22.55	$	20.61
Exercisable as of December 31, 2011		5,852		3,146	$	21.84	0.2
Weighted-average exercise price, as of December 31, 2011	$	22.47	$	20.66
Weighted-average remaining contractual term		0.2		0.2

2011 Aggregate Intrinsic Value
(in millions)			Net Settled Options		Cash Settled Options		Total
Class A Common Stock
	Outstanding as of December 31, 2011	$	568	$	62	$	630
	Exercisable as of December 31, 2011	$	198	$	60	$	258
Class A Special Common Stock
	Outstanding as of December 31, 2011	$	7	$	10	$	17
	Exercisable as of December 31, 2011	$	7	$	9	$	16

Exercised Stock Options
Year ended December 31 (in millions)		2011		2010		2009
Intrinsic value of options exercised	$	156	$	8	$	-
Tax benefit of options exercised	$	58	$	3	$	-
Cash received from options exercised	$	223	$	34	$	1

The stock option information above does not include 1.5 million stock options outstanding, with a weighted-average exercise price of $16.55 per share, for the year ended December 31, 2011. These stock options were issued under a stock option liquidity program in 2005 and will expire by the end of 2012. Cash received from options exercised under the stock option liquidity program during the year ended December 31, 2011 was $60 million.

We also maintain a deferred stock option plan for certain employees and directors that allowed the optionees to defer the receipt of shares of Class A or Class A Special common stock that would otherwise be deliverable when the stock options are exercised. As of December 31, 2011, approximately 1.9 million shares of Class A Special common stock were issuable under exercised options, the receipt of which was irrevocably deferred by participants.

Restricted Stock Plan

We maintain a restricted stock plan under which certain employees and directors (each, a “participant”) may be granted RSU awards in units of Class A common stock. Under the restricted stock plan, a combined total of approximately 69 million shares of our Class A and Class A Special common stock are reserved for issuance, including those RSU awards outstanding as of December 31, 2011. RSUs are valued based on the closing price on the date of grant and discounted for the lack of dividends, if any, during the vesting period and entitle participants to receive, at the time of vesting, one share of common stock for each RSU. The awards vest annually, generally over a period not to exceed 5 years, and do not have voting or dividend rights prior to vesting. The table below presents the weighted-average fair value on the date of grants of the RSUs.

		2011		2010		2009
Weighted-average fair value at grant date	$	22.78	$	16.94	$	13.60

2011 Restricted Stock Plan Activity
		Nonvested Restricted Share Unit Awards (in thousands)		Weighted-Average Fair Value at Grant Date
Class A Common Stock
Nonvested awards outstanding as of
	January 1, 2011	29,551	$	16.94
Granted		10,847	$	22.78
Vested		(8,058)	$	18.16
Forfeited		(2,455)	$	17.83
Nonvested awards outstanding as of
	December 31, 2011	29,885	$	18.65

Vested Restricted Share Units
Year ended December 31 (in millions)		2011		2010		2009
Intrinsic value of RSUs vested	$	197	$	99	$	61
Tax benefit of RSUs vested	$	69	$	36	$	22

The restricted stock plan also allows certain employees and directors to defer the receipt of shares of Class A or Class A Special common stock that would otherwise be deliverable when their RSUs vest. As of December 31, 2011, approximately 1.6 million and 34,000 shares of Class A common stock and Class A Special common stock, respectively, were issuable under vested RSU awards, the receipt of which was irrevocably deferred by participants.

Employee Stock Purchase Plans

We maintain employee stock purchase plans that allow employees to purchase shares of our Class A common stock at a 15% discount. We recognize the fair value of the discount associated with shares purchased under the plan as share-based compensation expense. In 2011, 2010 and 2009, the employee costs associated with participation in the plans were satisfied with payroll deductions of approximately $58 million, $50 million and $48 million, respectively.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

Note 16: Income Taxes

Components of Income Tax Expense
Year ended December 31 (in millions)			2011		2010		2009
Current expense (benefit):
	Federal	$	1,480	$	1,502	$	802
	State		359		385		(156)
	Foreign		153		-		-
			1,992		1,887		646
Deferred expense (benefit):
	Federal		658		463		945
	State		371		86		(113)
	Foreign		29		-		-
			1,058		549		832
Income tax expense		$	3,050	$	2,436	$	1,478

For U.S. federal income tax purposes, NBCUniversal Holdings is treated as a partnership and NBCUniversal is disregarded as an entity separate from NBCUniversal Holdings. Accordingly, neither NBCUniversal Holdings nor NBCUniversal and its subsidiaries incur any material current or deferred domestic income taxes. Current and deferred foreign income taxes are incurred by NBCUniversal's foreign subsidiaries.

In 2011, NBCUniversal had foreign income before taxes of $476 million, on which foreign income tax expense has been recorded. We recorded U.S. income tax expense on our allocable share of NBCUniversal's income before taxes, both domestic and foreign, reduced by a U.S. tax credit equal to our allocable share of NBCUniversal's foreign income tax expense.

Our income tax expense differs from the federal statutory amount because of the effect of the items detailed in the table below.

Year ended December 31 (in millions)		2011		2010		2009
Federal tax at statutory rate	$	2,872	$	2,136	$	1,787
State income taxes, net of federal benefit		354		204		174
Foreign income taxes, net of federal credit		89		-		-
Nontaxable income attributable to noncontrolling interests		(410)		2		-
Benefit related to certain subsidiary reorganizations		-		-		(151)
Adjustments to uncertain and effectively settled tax positions, net		77		37		(178)
Accrued interest on uncertain and effectively settled tax positions, net		66		60		(120)
Other		2		(3)		(34)
Income tax expense	$	3,050	$	2,436	$	1,478

Components of Net Deferred Tax Liability
December 31 (in millions)			2011		2010
Deferred Tax Assets:
	Net operating loss carryforwards	$	468	$	343
	Differences between book and tax basis of long-term debt		114		123
	Nondeductible accruals and other		1,583		1,301
	Less: Valuation allowance		297		207
			1,868		1,560
Deferred Tax Liabilities:
	Differences between book and tax basis of property and equipment and intangible assets		29,185		28,468
	Differences between book and tax basis of investments		616		627
	Differences between book and tax basis of indexed debt securities		560		537
	Differences between book and tax outside basis of NBCUniversal		1,214		-
			31,575		29,632
Net deferred tax liability		$	29,707	$	28,072

Changes in net deferred income tax liabilities in 2011 that were not recorded as deferred income tax expense are related to decreases of $32 million associated with items included in other comprehensive income (loss) and to increases associated with the NBCUniversal transaction of $611 million. We accrued deferred tax expense of $85 million for our allocable share of NBCUniversal's undistributed foreign income. Our net deferred tax liability includes $23 billion related to franchise rights that will remain unchanged unless we recognize an impairment or dispose of a franchise.

Net deferred tax assets included in current assets are primarily related to our current investments and current liabilities. As of December 31, 2011, we had federal net operating loss carryforwards of $166 million and various state net operating loss carryforwards that expire in periods through 2031. As of December 31, 2011, we also had foreign net operating loss carryforwards of $271 million, the majority of which expire in periods through 2021, related to the foreign operations of NBCUniversal. The determination of the realization of the state net operating loss carryforwards is dependent on our subsidiaries' taxable income or loss, apportionment percentages, and state laws that can change from year to year and impact the amount of such carryforwards. We recognize a valuation allowance if we determine it is more likely than not that some portion, or all, of a deferred tax asset will not be realized. As of December 31, 2011 and 2010, our valuation allowance was related primarily to state and foreign net operating loss carryforwards. In 2011, 2010 and 2009, income tax benefits (expense) attributable to share-based compensation of approximately $(38) million, $(3) million and $14 million, respectively, were allocated to shareholders' equity.

Uncertain Tax Positions

Our uncertain tax positions as of December 31, 2011 totaled $1.4 billion, excluding the federal benefits on state tax positions that have been recorded as deferred income taxes, including $50 million related to tax positions of NBCUniversal for which we have been indemnified by GE. If we were to recognize the tax benefit for our uncertain tax positions in the future, approximately $1.1 billion would impact our effective tax rate and the remaining amount would increase our deferred income tax liability.

Reconciliation of Unrecognized Tax Benefits
(in millions)		2011		2010		2009
Balance, January 1	$	1,251	$	1,185	$	1,450
Additions based on tax positions related to the current year		87		69		57
Additions based on tax positions related to the prior years		75		59		-
Additions from acquired subsidiaries		57		-		-
Reductions for tax positions of prior years		(22)		(28)		(257)
Reductions due to expiration of statute of limitations		(5)		(24)		-
Settlements with taxing authorities		(8)		(10)		(65)
Balance, December 31	$	1,435	$	1,251	$	1,185

As of December 31, 2011 and 2010, we had accrued approximately $698 million, including $10 million related to tax positions of NBCUniversal for which we have been indemnified by GE, and $604 million, respectively, of interest associated with our uncertain tax positions.

The IRS is examining our 2009 through 2011 tax returns. The IRS completed its examination of our income tax returns for the years 2000 through 2008 and proposed adjustments that relate primarily to certain financing transactions. We are currently disputing those proposed adjustments, and we filed petitions with the United States Tax Court in January 2011. If the adjustments are sustained, they would not have a material impact on our effective tax rate.

Various states are examining our tax returns through 2010. The tax years of our state tax returns currently under examination vary by state. The majority of the periods under examination relate to tax years 2000 and forward, with a select few dating back to 1993.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Supplemental Financial Information

12 Months Ended

Dec. 31, 2011

Supplemental Financial Information [Abstract]

Supplemental Financial Information

Note 17: Supplemental Financial Information

Receivables
December 31 (in millions)		2011		2010
Receivables, gross	$	4,978	$	2,028
Less: Allowance for returns and customer incentives		425		-
Less: Allowance for doubtful accounts		202		173
Receivables, net	$	4,351	$	1,855

Operating Costs and Expenses
Year ended December 31 (in millions)		2011		2010		2009
Programming and production	$	16,623	$	8,555	$	7,846
Cable Communications technical labor		2,280		2,263		2,295
Cable Communications customer service		1,855		1,833		1,881
Advertising, marketing and promotion		4,240		2,415		2,056
Other		12,487		8,275		7,964
Operating costs and expenses (excluding depreciation and amortization)	$	37,485	$	23,341	$	22,042

Cash Payments for Interest and Income Taxes
Year ended December 31 (in millions)		2011		2010		2009
Interest	$	2,441	$	1,983	$	2,040
Income taxes	$	1,626	$	1,864	$	1,303

Noncash Investing and Financing Activities

During 2011, we:

• acquired 51% of NBCUniversal Holdings on January 28, 2011, for cash and a 49% interest in the Comcast Content Business (see Note 4 for additional information on the NBCUniversal transaction)

• acquired the remaining 50% equity interest in Universal Orlando (see Note 4 for additional information on the Universal Orlando transaction)

• recorded a liability of $305 million for a quarterly cash dividend of $0.1125 per common share paid in January 2012, which is a noncash financing activity

• acquired $1 billion of property and equipment and intangible assets that were accrued but unpaid, which is a noncash investing activity

During 2010, we:

• recorded a liability of $263 million for a quarterly cash dividend of $0.0945 per common share paid in January 2011, which is a noncash financing activity

• acquired $611 million of property and equipment and software that were accrued but unpaid, which is a noncash investing activity

During 2009, we:

• recorded a liability of $268 million for a quarterly cash dividend of $0.0945 per common share paid in January 2010, which is a noncash financing activity

• acquired $389 million of property and equipment and software that were accrued but unpaid, which is a noncash investing activity

Receivables Monetization

12 Months Ended

Dec. 31, 2011

Receivables Monetization [Abstract]

Receivables Monetization

Note 18: Receivables Monetization

NBCUniversal monetizes certain of its accounts receivable under programs with a syndicate of banks. We account for receivables monetized through these programs as sales in accordance with the appropriate accounting guidance. We receive deferred consideration from the assets sold in the form of a receivable, which is funded by residual cash flows after the senior interests have been fully paid. The deferred consideration is recorded in receivables, net at its initial fair value, which reflects the net cash flows we expect to receive related to these interests. The accounts receivable we sold that underlie the deferred consideration are generally short-term in nature and, therefore, the fair value of the deferred consideration approximated its carrying value as of December 31, 2011.

NBCUniversal is responsible for servicing the receivables and remitting collections to the purchasers under the securitization programs. NBCUniversal performs this service for a fee that is equal to the prevailing market rate for such services. As a result, no servicing asset or liability has been recorded in our consolidated balance sheet as of December 31, 2011. These servicing fees are a component of net loss (gain) on sale presented in the table below.

Effect on Income from Receivables Monetization and Cash Flows on Transfers
Year ended December 31 (in millions)		2011
Net (loss) gain on sale^(a)	$	(36)
Net cash proceeds (payments) on transfers^(b)	$	(237)

Net (loss) gain on sale is included in other income (expense), net in our consolidated statement of income.
Net cash proceeds (payments) on transfers are included within net cash provided by operating activities in our consolidated statement of cash flows.

Receivables Monetized and Deferred Consideration
December 31 (in millions)		2011
Monetized receivables sold	$	961
Deferred consideration	$	268

In addition to the amounts presented above, we had $781 million payable to our securitization programs as of December 31, 2011. This amount represents cash receipts that are not yet remitted to the securitization program as of the balance sheet date and is recorded to accounts payable and accrued expenses related to trade creditors.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies [Abstract]

Commitments and Contingencies

Note 19: Commitments and Contingencies

Commitments

NBCUniversal enters into long-term commitments with third parties in the ordinary course of its business, including commitments to acquire film and television programming, take or pay creative talent and employment agreements, and various other television commitments. Many of NBCUniversal's employees, including writers, directors, actors, technical and production personnel, and others, as well as some of its on-air and creative talent, are covered by collective bargaining agreements or works councils. As of December 31, 2011, the total number of NBCUniversal employees on its payroll covered by collective bargaining agreements was approximately 4,000 full-time equivalent employees. Of this total, approximately 46% of these full-time equivalent employees were covered by collective bargaining agreements that have expired or are scheduled to expire during 2012.

We, through Comcast Spectacor, have employment agreements with both players and coaches of the Philadelphia Flyers. Certain of these employment agreements, which provide for payments that are guaranteed regardless of employee injury or termination, are covered by disability insurance if certain conditions are met.

The table below summarizes our minimum annual programming and talent commitments and our minimum annual rental commitments for office space, equipment and transponder service agreements under operating leases. Programming and talent commitments include acquired film and television programming, including U.S. television rights to the future Olympic Games through 2020, NBC's Sunday Night Football through the 2022-23 season, and other programming commitments, as well as our various contracts with creative talent and employment agreements under take-or-pay contracts.

As of December 31, 2011 (in millions)		Programming and Talent Commitments		Operating Leases
2012	$	4,793	$	548
2013	$	2,388	$	448
2014	$	2,887	$	388
2015	$	1,976	$	333
2016	$	3,104	$	320
Thereafter	$	17,301	$	1,410

Included in the table above are specific payments for the U.S. television rights to the 2012 London Olympics. This programming commitment was considered an unfavorable contract in the application of acquisition accounting for the NBCUniversal transaction. We recorded a liability related to this contract which will be reversed in our consolidated financial statements at the time the corresponding revenue and expenses associated with this contract is recognized.

The table below presents our rental expense charged to operations.

Year ended December 31 (in millions)		2011		2010		2009
Rental expense	$	570	$	424	$	418

Other Commitments

In connection with the NBCUniversal and Universal Orlando transactions, we assumed two contractual obligations that involve perpetual financial interests held by third parties in certain NBCUniversal businesses. These interests are based upon a percentage of future revenue of the specified businesses. One of the contractual obligations provides the third party with the option, beginning in 2017, to require NBCUniversal to purchase the interest for cash in an amount equal to the fair value of the estimated future payments. These liabilities were recorded at fair value as of their respective acquisition dates, and subsequent fair value adjustments to these liabilities are recorded in other income (expense), net in our consolidated statement of income. Fair values are determined based on the terms of the contracts and Level 3 inputs, primarily including discounted future expected cash flows. As of December 31, 2011, these liabilities totaled $1 billion and the related expenses recognized in other income (expense), net in 2011 were $57 million.

Station Venture

NBCUniversal owns a 79.62% equity interest and a 50% voting interest in Station Venture Holdings, LLC (“Station Venture”), a variable interest entity. The remaining equity interests in Station Venture are held by LIN TV, Corp. (“LIN TV”). Station Venture holds an indirect interest in the NBC owned local television stations in Dallas, Texas and San Diego, California through its ownership interests in Station Venture Operations, LP (“Station LP”), a less than wholly owned consolidated subsidiary of NBCUniversal. Station Venture is the obligor on an $816 million senior secured note that is due in 2023 to General Electric Capital Corporation, as servicer. The note is nonrecourse to NBCUniversal, guaranteed by LIN TV and collateralized by substantially all of the assets of Station Venture and Station LP. In connection with the close of the NBCUniversal transaction, GE indemnified NBCUniversal for all liabilities NBCUniversal may incur as a result of any credit support, risk of loss or similar arrangement related to the senior secured note in existence prior to the close. We are not the primary beneficiary of, and accordingly do not consolidate, Station Venture. The carrying value of our equity method investment in Station Venture was zero as of December 31, 2011. Because the assets of Station LP serve as collateral for Station Venture's $816 million senior secured note, we have recorded a $482 million liability in our allocation of purchase price for the NBCUniversal transaction, which represents the fair value of the assets allocated in acquisition accounting that collateralize the note.

Contingencies

Antitrust Cases

We are defendants in two purported class actions originally filed in December 2003 in the United States District Courts for the District of Massachusetts and the Eastern District of Pennsylvania. The potential class in the Massachusetts case, which has been transferred to the Eastern District of Pennsylvania, is our customer base in the “Boston Cluster” area, and the potential class in the Pennsylvania case is our customer base in the “Philadelphia and Chicago Clusters,” as those terms are defined in the complaints. In each case, the plaintiffs allege that certain customer exchange transactions with other cable providers resulted in unlawful horizontal market restraints in those areas and seek damages under antitrust statutes, including treble damages.

Classes of Chicago Cluster and Philadelphia Cluster customers were certified in October 2007 and January 2010, respectively. We appealed the class certification in the Philadelphia Cluster case to the Third Circuit Court of Appeals, which affirmed the class certification in August 2011 and denied our petition for a rehearing en banc in September 2011. While we have given notice to the class, we filed a writ of certiorari with the U.S. Supreme Court asking that it review the Third Circuit Court of Appeals' ruling. In March 2010, we moved for summary judgment dismissing all of the plaintiffs' claims in the Philadelphia Cluster. A hearing on our summary judgment was held in January 2012. We expect that the Philadelphia Cluster case will proceed to trial in 2012. The plaintiffs' claims concerning the other two clusters are stayed pending determination of the Philadelphia Cluster claims.

We also are among the defendants in a purported class action filed in the United States District Court for the Central District of California in September 2007. The potential class is comprised of all persons residing in the United States who have subscribed to an expanded basic level of video service provided by one of the defendants. The plaintiffs allege that the defendants who produce video programming have entered into agreements with the defendants who distribute video programming via cable and satellite (including us), which preclude the distributor defendants from reselling channels to customers on an “unbundled” basis in violation of federal antitrust laws. The plaintiffs seek treble damages and injunctive relief requiring each distributor defendant to resell certain channels to its customers on an “unbundled” basis. In October 2009, the Central District of California issued an order dismissing the plaintiffs' complaint with prejudice. In June 2011, a panel of the Ninth Circuit Court of Appeals affirmed the District Court's order; however after the death of one of the judges on the Ninth Circuit panel, the Court withdrew its June 2011 opinion and, as a result, we expect that a new opinion will be issued.

In addition, we are the defendant in 22 purported class actions filed in federal district courts throughout the country. All of these actions have been consolidated by the Judicial Panel on Multidistrict Litigation in the United States District Court for the Eastern District of Pennsylvania for pre-trial proceedings. In a consolidated complaint filed in November 2009 on behalf of all plaintiffs in the multidistrict litigation, the plaintiffs allege that we improperly “tie” the rental of set-top boxes to the provision of premium cable services in violation of Section 1 of the Sherman Antitrust Act, various state antitrust laws and unfair/deceptive trade practices acts in California, Illinois and Alabama. The plaintiffs also allege a claim for unjust enrichment and seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California, Alabama, Illinois, Pennsylvania and Washington. In January 2010, we moved to compel arbitration of the plaintiffs' claims for unjust enrichment and violations of the unfair/deceptive trade practices acts of Illinois and Alabama. In September 2010, the plaintiffs filed an amended complaint alleging violations of additional state antitrust laws and unfair/deceptive trade practices acts on behalf of new subclasses in Connecticut, Florida, Minnesota, Missouri, New Jersey, New Mexico and West Virginia. In the amended complaint, plaintiffs omitted their unjust enrichment claim, as well as their state law claims on behalf of the Alabama, Illinois and Pennsylvania subclasses. In June 2011, the plaintiffs filed another amended complaint alleging only violations of Section 1 of the Sherman Antitrust Act, antitrust law in Washington and unfair/deceptive trade practices acts in California and Washington. The plaintiffs seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California and Washington. In July 2011, we moved to compel arbitration of most of the plaintiffs' claims and to stay the remaining claims pending arbitration.

The West Virginia Attorney General also filed a complaint in West Virginia state court in July 2009 alleging that we improperly “tie” the rental of set-top boxes to the provision of digital cable services in violation of the West Virginia Antitrust Act and the West Virginia Consumer Credit and Protection Act. The Attorney General also alleges a claim for unjust enrichment/restitution. We removed the case to the United States District Court for West Virginia, and it was subsequently transferred to the United States District Court for the Eastern District of Pennsylvania and consolidated with the multidistrict litigation described above. In March 2010, the Eastern District of Pennsylvania denied the Attorney General's motion to remand the case back to West Virginia state court. In June 2010, the Attorney General moved to sever and remand the portion of the claims seeking civil penalties and injunctive relief back to West Virginia state court. We filed a brief in opposition to the motion in July 2010.

We believe the claims in each of the pending actions described above in this item are without merit and intend to defend the actions vigorously. We cannot predict the outcome of any of the actions described above, including a range of possible loss, or how the final resolution of any such actions would impact our results of operations or cash flows for any one period or our consolidated financial position. In addition, as any action nears a trial, there is an increased possibility that the action may be settled by the parties. Nevertheless, the final disposition of any of the above actions is not expected to have a material adverse effect on our consolidated financial position, but could possibly be material to our consolidated results of operations or cash flows for any one period.

Other

We are a defendant in several unrelated lawsuits claiming infringement of various patents relating to various aspects of our businesses. In certain of these cases other industry participants are also defendants, and also in certain of these cases we expect that any potential liability would be in part or in whole the responsibility of our equipment and technology vendors under applicable contractual indemnification provisions. We are also subject to other legal proceedings and claims that arise in the ordinary course of our business. While the amount of ultimate liability with respect to such actions is not expected to materially affect our financial position, results of operations or cash flows, any litigation resulting from any such legal proceedings or claims could be time consuming, costly and injure our reputation.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Financial Data by Business Segment

12 Months Ended

Dec. 31, 2011

Financial Data By Business Segment [Abstract]

Financial Data by Business Segment

Note 20: Financial Data by Business Segment

Following the NBCUniversal transaction, we present our operations in five reportable segments; Cable Communications, Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks. The Comcast Content Business is presented with NBCUniversal's businesses in the Cable Networks segment. The businesses of Comcast Interactive Media (previously presented in Corporate and Other) that were not contributed to NBCUniversal are included in the Cable Communications segment. We recast our segment presentation for the years ended December 31, 2010 and 2009, in order to reflect our current reportable segments. Operating income (loss) before depreciation and amortization for our Theme Parks segment includes 100% of the results of operations of Universal Orlando for the period January 29, 2011 through December 31, 2011, to reflect our current measure of operating performance for our Theme Parks segment. See Note 4 for additional information on the NBCUniversal and Universal Orlando transactions. Our financial data by business segment is presented in the tables below.

(in millions)			Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures		Assets^(h)
2011
Cable Communications^(a)		$	37,226	$	15,288	$	6,395	$	8,893	$	4,806	$	120,729
NBCUniversal
	Cable Networks^(b)		8,108		3,185		718		2,467		48		29,578
	Broadcast Television^(c)		5,935		138		79		59		61		6,213
	Filmed Entertainment^(c)		4,239		27		20		7		6		3,891
	Theme Parks^(c)		1,874		830		146		684		154		6,197
	Headquarters and Other^(d)		45		(484)		168		(652)		165		5,443
	Eliminations^(e)		(941)		(234)		1		(235)		-		(538)
NBCUniversal			19,260		3,462		1,132		2,330		434		50,784
Corporate and Other^(c)			558		(416)		93		(509)		67		6,224
Eliminations^(e)			(1,202)		23		16		7		-		(19,919)
Comcast Consolidated		$	55,842	$	18,357	$	7,636	$	10,721	$	5,307	$	157,818

(in millions)		Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
2010
Cable Communications^(a)	$	35,363	$	14,302	$	6,232	$	8,070	$	4,853
Cable Networks^(b)		2,719		732		323		409		51
Corporate and Other^(c)		168		(438)		61		(499)		57
Eliminations^(e)		(313)		-		-		-		-
Comcast Consolidated	$	37,937	$	14,596	$	6,616	$	7,980	$	4,961

(in millions)		Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
2009
Cable Communications^(a)	$	33,544	$	13,459	$	6,199	$	7,260	$	5,031
Cable Networks^(b)		2,415		606		278		328		55
Corporate and Other^(c)		49		(351)		23		(374)		31
Eliminations^(e)		(252)		-		-		-		-
Comcast Consolidated	$	35,756	$	13,714	$	6,500	$	7,214	$	5,117

(a) Our Cable Communications segment consists primarily of our cable services business and the businesses of Comcast Interactive Media that were not contributed to NBCUniversal.

For the years ended December 31, 2011, 2010 and 2009, Cable Communications segment revenue was derived from the following sources:

		2011		2010		2009
Residential:
	Video	52.7	%	54.8	%	57.5	%
	High-speed Internet	23.5	%	22.5	%	21.7	%
	Voice	9.4	%	9.3	%	9.2	%
Advertising		5.4	%	5.7	%	4.8	%
Business services		4.8	%	3.6	%	2.5	%
Other		4.2	%	4.1	%	4.3	%
Total		100	%	100	%	100	%

Subscription revenue received from customers who purchase bundled services at a discounted rate is allocated proportionally to each service based on the individual service's price on a stand-alone basis. For 2011, 2010 and 2009, 2.8%, 2.8% and 2.5%, respectively, of Cable Communications revenue was derived from franchise and other regulatory fees.

(b) For 2011, our Cable Networks segment consists primarily of NBCUniversal's national cable networks, international cable networks, cable television production studio and certain digital media properties, and the Comcast Content Business. For 2010 and 2009, our Cable Networks segment consisted of the Comcast Content Business.

(d) NBCUniversal Headquarters and Other activities include costs associated with overhead, allocations and employee benefits.

(e) Eliminations include the results of operations for Universal Orlando for the period January 29, 2011 through June 30, 2011. The Theme Parks segment includes these amounts to reflect our current measure of operating performance for our Theme Parks segment but these amounts are not included when we measure total NBCUniversal and our consolidated results of operations because we recorded Universal Orlando as an equity method investment in our consolidated financial statements during this period.

Also included in Eliminations are transactions that our segments enter into with one another. The most common types of transactions are the following:

• our Cable Networks and Broadcast Television segments generate revenue by selling programming to our Cable Communications segment, which represents a substantial majority of the revenue elimination amount

• our Cable Communications segment receives incentives offered by our Cable Networks segment in connection with its distribution of the Cable Networks' content that are recorded as a reduction to programming expenses

• our Cable Communications segment generates revenue by selling advertising and by selling the use of satellite feeds to our Cable Networks segment

• our Filmed Entertainment and Broadcast Television segments generate revenue by licensing content to our Cable Networks segment

Revenue from customers located outside of the U.S., primarily in Europe and Asia, for year ended December 31, 2011, was $4.1 billion. Revenue from customers located outside of the U.S. was not significant for the years ended December 31, 2010 and 2009. No single customer accounted for a significant amount of our revenue in any period.
We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses from the sale of assets, if any, to measure the profit or loss of our operating segments. This measure eliminates the significant level of noncash depreciation and amortization expense that results from the capital-intensive nature of certain of our businesses and from intangible assets recognized in business combinations. It is also unaffected by our capital structure or investment activities. We use this measure to evaluate our consolidated operating performance, the operating performance of our operating segments and to allocate resources and capital to our operating segments. It is also a significant performance measure in our annual incentive compensation programs. We believe that this measure is useful to investors because it is one of the bases for comparing our operating performance with other companies in our industries, although our measure may not be directly comparable to similar measures used by other companies. This measure should not be considered a substitute for operating income (loss), net income (loss) attributable to Comcast Corporation, net cash provided by operating activities, or other measures of performance or liquidity reported in accordance with GAAP.
Property and equipment, net associated with operations located outside the U.S., primarily in Europe and Asia, was $60 million in 2011. Property and equipment, net associated with operations located outside the U.S. was not significant in 2010.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 32
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599

+ Details

Quarterly Financial Information

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information

Quarterly Financial Information

Note 21: Quarterly Financial Information (Unaudited)

(in millions, except per share data)		First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Total Year
2011
Revenue	$	12,128	$	14,333	$	14,339	$	15,042	$	55,842
Operating income	$	2,224	$	2,938	$	2,641	$	2,918	$	10,721
Net income attributable to Comcast Corporation	$	943	$	1,022	$	908	$	1,287	$	4,160
Basic earnings per common share attributable to Comcast Corporation shareholders	$	0.34	$	0.37	$	0.33	$	0.47	$	1.51
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	0.34	$	0.37	$	0.33	$	0.47	$	1.50
Dividends declared per common share attributable to Comcast Corporation shareholders	$	0.1125	$	0.1125	$	0.1125	$	0.1125	$	0.45
2010
Revenue	$	9,202	$	9,525	$	9,489	$	9,721	$	37,937
Operating income	$	1,935	$	2,078	$	1,954	$	2,013	$	7,980
Net income attributable to Comcast Corporation	$	866	$	884	$	867	$	1,018	$	3,635
Basic earnings per common share attributable to Comcast Corporation shareholders	$	0.31	$	0.31	$	0.31	$	0.37	$	1.29
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	0.31	$	0.31	$	0.31	$	0.36	$	1.29
Dividends declared per common share attributable to Comcast Corporation shareholders	$	0.0945	$	0.0945	$	0.0945	$	0.0945	$	0.378

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References + Details

Condensed Consolidating Financial Information

12 Months Ended

Dec. 31, 2011

Condensed Consolidating Financial Information [Abstract]

Condensed Consolidating Financial Information

Note 22: Condensed Consolidating Financial Information

Comcast Corporation and four of our 100% owned cable holding company subsidiaries, Comcast Cable Communications, LLC (“CCCL”), Comcast MO Group, Inc. (“Comcast MO Group”), Comcast Cable Holdings, LLC (“CCH”) and Comcast MO of Delaware, LLC (“Comcast MO of Delaware”), have fully and unconditionally guaranteed each other's debt securities. Comcast MO Group, CCH and Comcast MO of Delaware are collectively referred to as the “Combined CCHMO Parents.” The debt securities within the guarantee structure have the following maturities: $580 million in 2012; $2.4 billion in 2013; $1.1 billion in 2014; $2.3 billion in 2015; $1.8 billion in 2016; and $20.6 billion thereafter.

Comcast Corporation provides an unconditional subordinated guarantee of the $185 million principal amount currently outstanding of Comcast Holdings' ZONES due October 2029 and the $202 million principal amount currently outstanding of Comcast Holdings' 10 5/8% senior subordinated debentures due 2012. Comcast Corporation does not guarantee the $62 million principal amount currently outstanding of Comcast Holdings' ZONES due November 2029.

As a result of the NBCUniversal transaction on January 28, 2011, our investments in NBCUniversal Holdings are held by the Comcast parent and Comcast Holdings. Certain entities of the Comcast Content Business were subsidiaries of Comcast Holdings. Since these entities were contributed to NBCUniversal Holdings, they are included with the Comcast Parent's investment in NBCUniversal Holdings. However, the operations of these businesses are presented in the nonguarantor subsidiaries column. Effective October 2011, NBCUniversal provided an unconditional guarantee of Universal Orlando's senior and senior subordinated notes due 2015 and 2016. Comcast Corporation does not guarantee this obligation. The operations of NBCUniversal and Universal Orlando are presented in the nonguarantor subsidiaries column. Our condensed consolidating financial information is presented in the tables below.

Condensed Consolidating Balance Sheet
December 31, 2011
(in millions)			Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Assets
	Cash and cash equivalents	$	-	$	-	$	-	$	-	$	1,620	$	-	$	1,620
	Receivables, net		-		-		-		-		4,351		-		4,351
	Programming rights		-		-		-		-		987		-		987
	Other current assets		235		8		3		-		1,369		-		1,615
Total current assets			235		8		3		-		8,327		-		8,573
Film and television costs			-		-		-		-		5,227		-		5,227
Investments			-		-		-		-		9,854		-		9,854
Investments in and amounts due from subsidiaries eliminated upon consolidation			71,222		89,568		45,725		88,336		36,949		(331,800)		-
Property and equipment, net			262		-		-		-		27,297		-		27,559
Franchise rights			-		-		-		-		59,376		-		59,376
Goodwill			-		-		-		-		26,874		-		26,874
Other intangible assets, net			9		-		-		-		18,156		-		18,165
Other noncurrent assets, net			912		30		5		148		1,761		(666)		2,190
Total assets		$	72,640	$	89,606	$	45,733	$	88,484	$	193,821	$	(332,466)	$	157,818

Liabilities and Equity
	Accounts payable and accrued expenses related to trade creditors	$	10	$	-	$	-	$	-	$	5,695	$	-	$	5,705
	Accrued participations and residuals		-		-		-		-		1,255		-		1,255
	Accrued expenses and other current liabilities		1,030		189		77		272		3,346		-		4,914
	Current portion of long-term debt		26		-		554		202		585		-		1,367
Total current liabilities			1,066		189		631		474		10,881		-		13,241
Long-term debt, less current portion			22,451		3,953		1,764		111		9,663		-		37,942
Deferred income taxes			-		-		-		727		29,728		(523)		29,932
Other noncurrent liabilities			1,849		-		-		-		11,328		(143)		13,034
Redeemable noncontrolling interests			-		-		-		-		16,014		-		16,014
Equity:
	Common stock		32		-		-		-		-		-		32
	Other shareholders’ equity		47,242		85,464		43,338		87,172		115,826		(331,800)		47,242
Total Comcast Corporation shareholders’ equity			47,274		85,464		43,338		87,172		115,826		(331,800)		47,274
Noncontrolling interests			-		-		-		-		381		-		381
Total equity			47,274		85,464		43,338		87,172		116,207		(331,800)		47,655
Total liabilities and equity		$	72,640	$	89,606	$	45,733	$	88,484	$	193,821	$	(332,466)	$	157,818

Condensed Consolidating Balance Sheet
December 31, 2010
(in millions)			Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Assets
	Cash and cash equivalents	$	-	$	-	$	-	$	-	$	5,984	$	-	$	5,984
	Receivables, net		-		-		-		-		1,855		-		1,855
	Programming rights		-		-		-		-		122		-		122
	Other current assets		162		-		-		-		763		-		925
Total current assets			162		-		-		-		8,724		-		8,886
Film and television costs			-		-		-		-		460		-		460
Investments			-		-		-		-		6,670		-		6,670
Investments in and amounts due from subsidiaries eliminated upon consolidation			68,987		90,076		52,652		72,629		12,339		(296,683)		-
Property and equipment, net			278		-		-		-		23,237		-		23,515
Franchise rights			-		-		-		-		59,442		-		59,442
Goodwill			-		-		-		-		14,958		-		14,958
Other intangible assets, net			10		-		-		-		3,421		-		3,431
Other noncurrent assets, net			1,128		45		-		148		670		(819)		1,172
Total assets		$	70,565	$	90,121	$	52,652	$	72,777	$	129,921	$	(297,502)	$	118,534

Liabilities and Equity
	Accounts payable and accrued expenses related to trade creditors	$	6	$	3	$	-	$	-	$	3,282	$	-	$	3,291
	Accrued expenses and other current liabilities		1,038		187		74		266		1,578		-		3,143
	Current portion of long-term debt		755		1,000		-		-		45		-		1,800
Total current liabilities			1,799		1,190		74		266		4,905		-		8,234
Long-term debt, less current portion			22,754		3,963		2,339		310		249		-		29,615
Deferred income taxes			-		-		-		704		28,218		(676)		28,246
Other noncurrent liabilities			1,658		-		-		-		6,347		(143)		7,862
Redeemable noncontrolling interests			-		-		-		-		143		-		143
Equity:
	Common stock		32		-		-		-		-		-		32
	Other shareholders’ equity		44,322		84,968		50,239		71,497		89,979		(296,683)		44,322
Total Comcast Corporation shareholders’ equity			44,354		84,968		50,239		71,497		89,979		(296,683)		44,354
Noncontrolling interests			-		-		-		-		80		-		80
Total equity			44,354		84,968		50,239		71,497		90,059		(296,683)		44,434
Total liabilities and equity		$	70,565	$	90,121	$	52,652	$	72,777	$	129,921	$	(297,502)	$	118,534

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2011
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	55,842	$	-	$	55,842
Management fee revenue		800		784		488		-		-		(2,072)		-
		800		784		488		-		55,842		(2,072)		55,842
Costs and Expenses:
Operating costs and expenses		420		784		488		5		37,860		(2,072)		37,485
Depreciation		29		-		-		-		6,011		-		6,040
Amortization		3		-		-		-		1,593		-		1,596
		452		784		488		5		45,464		(2,072)		45,121
Operating income (loss)		348		-		-		(5)		10,378		-		10,721
Other Income (Expense):
Interest expense		(1,439)		(338)		(172)		(32)		(524)		-		(2,505)
Investment income (loss), net		3		-		-		2		154		-		159
Equity in net income (losses) of investees, net		4,879		5,598		3,361		5,734		(35)		(19,572)		(35)
Other income (expense), net		(19)		-		-		1		(115)		-		(133)
		3,424		5,260		3,189		5,705		(520)		(19,572)		(2,514)
Income (loss) before income taxes		3,772		5,260		3,189		5,700		9,858		(19,572)		8,207
Income tax (expense) benefit		388		118		60		12		(3,628)		-		(3,050)
Net income (loss) from consolidated operations		4,160		5,378		3,249		5,712		6,230		(19,572)		5,157
Net (income) loss attributable to noncontrolling interests		-		-		-		-		(997)		-		(997)
Net income (loss) attributable to Comcast Corporation	$	4,160	$	5,378	$	3,249	$	5,712	$	5,233	$	(19,572)	$	4,160

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2010
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	37,937	$	-	$	37,937
Management fee revenue		808		726		452		-		-		(1,986)		-
		808		726		452		-		37,937		(1,986)		37,937
Costs and Expenses:
Operating costs and expenses		444		726		452		59		23,646		(1,986)		23,341
Depreciation		29		-		-		-		5,510		-		5,539
Amortization		3		-		-		-		1,074		-		1,077
		476		726		452		59		30,230		(1,986)		29,957
Operating income (loss)		332		-		-		(59)		7,707		-		7,980
Other Income (Expense):
Interest expense		(1,402)		(402)		(173)		(33)		(146)		-		(2,156)
Investment income (loss), net		8		-		-		7		273		-		288
Equity in net income (losses) of investees, net		4,329		4,741		3,015		4,675		(141)		(16,760)		(141)
Other income (expense), net		(5)		-		-		-		138		-		133
		2,930		4,339		2,842		4,649		124		(16,760)		(1,876)
Income (loss) before income taxes		3,262		4,339		2,842		4,590		7,831		(16,760)		6,104
Income tax (expense) benefit		373		141		61		30		(3,041)		-		(2,436)
Net income (loss) from consolidated operations		3,635		4,480		2,903		4,620		4,790		(16,760)		3,668
Net (income) loss attributable to noncontrolling interests		-		-		-		-		(33)		-		(33)
Net income (loss) attributable to Comcast Corporation	$	3,635	$	4,480	$	2,903	$	4,620	$	4,757	$	(16,760)	$	3,635

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2009
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	35,756	$	-	$	35,756
Management fee revenue		768		678		439		-		-		(1,885)		-
		768		678		439		-		35,756		(1,885)		35,756
Costs and Expenses:
Operating costs and expenses		362		678		439		57		22,391		(1,885)		22,042
Depreciation		29		-		-		-		5,454		-		5,483
Amortization		-		-		-		-		1,017		-		1,017
		391		678		439		57		28,862		(1,885)		28,542
Operating income (loss)		377		-		-		(57)		6,894		-		7,214
Other Income (Expense):
Interest expense		(1,296)		(666)		(223)		(29)		(134)		-		(2,348)
Investment income (loss), net		3		-		-		8		271		-		282
Equity in net income (losses) of investees, net		4,233		4,913		3,275		4,781		(64)		(17,202)		(64)
Other income (expense), net		-		-		-		-		22		-		22
		2,940		4,247		3,052		4,760		95		(17,202)		(2,108)
Income (loss) before income taxes		3,317		4,247		3,052		4,703		6,989		(17,202)		5,106
Income tax (expense) benefit		321		233		78		27		(2,137)		-		(1,478)
Net income (loss) from consolidated operations		3,638		4,480		3,130		4,730		4,852		(17,202)		3,628
Net (income) loss attributable to noncontrolling interests		-		-		-		-		10		-		10
Net income (loss) attributable to Comcast Corporation	$	3,638	$	4,480	$	3,130	$	4,730	$	4,862	$	(17,202)	$	3,638

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2011
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(513)	$	(209)	$	(131)	$	(19)	$	15,217	$	-	$	14,345
Investing Activities:
Net transactions with affiliates		4,615		1,209		131		19		(5,974)		-		-
Capital expenditures		(7)		-		-		-		(5,300)		-		(5,307)
Cash paid for intangible assets		(2)		-		-		-		(952)		-		(954)
Acquisitions, net of cash acquired		-		-		-		-		(6,407)		-		(6,407)
Proceeds from sales of businesses and investments		-		-		-		-		277		-		277
Purchases of investments		-		-		-		-		(135)		-		(135)
Other		-		-		-		-		18		-		18
Net cash provided by (used in) investing activities		4,606		1,209		131		19		(18,473)		-		(12,508)
Financing Activities:
Proceeds from (repayments of) short-term borrowings, net		(4)		-		-		-		548		-		544
Proceeds from borrowings		-		-		-		-		-		-		-
Repurchases and repayments of debt		(1,095)		(1,000)		-		-		(1,121)		-		(3,216)
Repurchases and retirements of common stock		(2,141)		-		-		-		-		-		(2,141)
Dividends paid		(1,187)		-		-		-		-		-		(1,187)
Issuances of common stock		283		-		-		-		-		-		283
Distributions to noncontrolling interests		-		-		-		-		(325)		-		(325)
Other		51		-		-		-		(210)		-		(159)
Net cash provided by (used in) financing activities		(4,093)		(1,000)		-		-		(1,108)		-		(6,201)
Increase (decrease) in cash and cash equivalents		-		-		-		-		(4,364)		-		(4,364)
Cash and cash equivalents, beginning of year		-		-		-		-		5,984		-		5,984
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	1,620	$	-	$	1,620

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2010
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(391)	$	(257)	$	(132)	$	(235)	$	12,194	$	-	$	11,179
Investing Activities:
Net transactions with affiliates		488		257		132		248		(1,125)		-		-
Capital expenditures		(7)		-		-		-		(4,954)		-		(4,961)
Cash paid for intangible assets		(2)		-		-		-		(534)		-		(536)
Acquisitions, net of cash acquired		-		-		-		-		(183)		-		(183)
Proceeds from sales of businesses and investments		-		-		-		-		99		-		99
Purchases of investments		-		-		-		-		(260)		-		(260)
Other		-		-		-		-		130		-		130
Net cash provided by (used in) investing activities		479		257		132		248		(6,827)		-		(5,711)
Financing Activities:
Proceeds from borrowings		3,390		-		-		-		30		-		3,420
Repurchases and repayments of debt		(1,100)		-		-		(13)		(40)		-		(1,153)
Repurchases and retirements of common stock		(1,200)		-		-		-		-		-		(1,200)
Dividends paid		(1,064)		-		-		-		-		-		(1,064)
Issuances of common stock		34		-		-		-		-		-		34
Distributions to noncontrolling interests		-		-		-		-		(67)		-		(67)
Other		(148)		-		-		-		23		-		(125)
Net cash provided by (used in) financing activities		(88)		-		-		(13)		(54)		-		(155)
Increase (decrease) in cash and cash equivalents		-		-		-		-		5,313		-		5,313
Cash and cash equivalents, beginning of year		-		-		-		-		671		-		671
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	5,984	$	-	$	5,984

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2009
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	115	$	(472)	$	(185)	$	3	$	10,820	$	-	$	10,281
Investing Activities:
Net transactions with affiliates		1,215		3,438		539		259		(5,451)		-		-
Capital expenditures		(25)		-		-		-		(5,092)		-		(5,117)
Cash paid for intangible assets		(11)		-		-		-		(511)		-		(522)
Acquisitions, net of cash acquired		-		-		-		-		(88)		-		(88)
Proceeds from sales of businesses and investments		-		-		-		-		102		-		102
Purchases of investments		-		-		-		-		(346)		-		(346)
Other		-		-		-		-		74		-		74
Net cash provided by (used in) investing activities		1,179		3,438		539		259		(11,312)		-		(5,897)
Financing Activities:
Proceeds from borrowings		1,492		-		-		-		72		-		1,564
Repurchases and repayments of debt		(1,241)		(2,836)		(312)		(262)		(87)		-		(4,738)
Repurchases and retirements of common stock		(765)		-		-		-		-		-		(765)
Dividends paid		(761)		-		-		-		-		-		(761)
Issuances of common stock		1		-		-		-		-		-		1
Distributions to noncontrolling interests		-		-		-		-		(49)		-		(49)
Other		(20)		(130)		(42)		-		32		-		(160)
Net cash provided by (used in) financing activities		(1,294)		(2,966)		(354)		(262)		(32)		-		(4,908)
Increase (decrease) in cash and cash equivalents		-		-		-		-		(524)		-		(524)
Cash and cash equivalents, beginning of year		-		-		-		-		1,195		-		1,195
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	671	$	-	$	671

- Definition

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

+ References + Details

Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Comcast Corporation and Subsidiaries
Schedule II—Valuation and Qualifying Accounts
Year ended December 31, 2011, 2010 and 2009

Year Ended December 31 (in millions)			Balance at Beginning of Year	Additions Charged to Costs and Expenses	Deductions from Reserves		Balance at End of Year

2011
	Allowance for doubtful accounts	$	173	306	277	$	202
	Sales returns and allowances		-	536	111		425
2010
	Allowance for doubtful accounts	$	175	327	329	$	173
2009
	Allowance for doubtful accounts	$	190	385	400	$	175

Summary of Significant Accounting Policies (Policy)	12 Months Ended
Summary of Significant Accounting Policies (Policy)	Dec. 31, 2011
Summary of Significant Accounting Policies
Basis of Consolidation	Basis of Consolidation The accompanying consolidated financial statements include (i) all of our accounts, (ii) all entities in which we have a controlling voting interest (“subsidiaries”) and (iii) variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”). We have eliminated intercompany accounts and transactions among consolidated entities.
Cash Equivalents	Cash Equivalents The carrying amounts of our cash equivalents approximate their fair value. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of less than three months when purchased.
Use of Estimates	Use of Estimates We prepare our consolidated financial statements in accordance with GAAP, which requires us to make estimates and assumptions that affect the reported amounts and disclosures. Actual results could differ from those estimates. Estimates are used when accounting for various items, including the fair value of acquisition-related assets and liabilities, allowances for doubtful accounts, amortization of owned and acquired programming, impairment of capitalized film and television costs, participation and residual accruals, investments, derivative financial instruments, asset impairments, nonmonetary transactions, pensions and other postretirement benefits, revenue recognition, estimates of DVD and Blu-ray discs (together, “DVDs”) returns and customer incentives, depreciation and amortization, income taxes, legal contingencies, and other contingent liabilities. See Note 11 for our discussion on fair value measurements.
Film And Television Costs	Film and Television Costs We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to operating costs and expenses. We record the amortization and the accrued costs using the ratio of the current period's actual revenue to the estimated total remaining gross revenue from all sources, which is referred to as ultimate revenue. Estimates of total revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the exhibition, licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of film and television programming. In determining the estimated lives and method of amortization of acquired film and television libraries, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset. Upon the occurrence of an event or change in circumstance that may indicate that the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film's fair value. We enter into arrangements with third parties to jointly finance and distribute certain of our film productions. These arrangements, which are referred to as cofinancing arrangements, can take various forms. In most cases, the form of the arrangement involves the grant of an economic interest in a film to a third-party investor. The number of investors and the terms of these arrangements can also vary, although in most cases an investor assumes full risk for the portion of the film acquired in these arrangements. We account for our proceeds under these arrangements as a reduction to our capitalized film costs. In these arrangements, the investor owns an undivided copyright interest in the film and, therefore, in each period we record either a charge or benefit to operating costs and expenses to reflect the estimate of the third-party investor's interest in the profit or loss of the film. The estimate of the third-party investor's interest in profit or loss of a film is determined by reference to the ratio of actual revenue earned to date in relation to the ultimate revenue expected to be recognized over a film's useful life. We capitalize costs of programming content that we license, but do not own, including rights to multiyear live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is available for use. We amortize capitalized programming costs as the associated programs are broadcast. We amortize multiyear, live-event sports programming rights using the ratio of the current period's actual direct revenue to the estimated total remaining direct revenue or over the contract term. We state the costs of acquired programming at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Acquired programming used in our Cable Networks segment is tested on a channel basis for impairment, whereas acquired programming in our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we will recognize an impairment charge to operating costs and expenses. See Note 5 for additional information on our film and television costs.
Investments	Investments We classify publicly traded investments that are not accounted for under the equity method as available-for-sale (“AFS”) or trading securities and record them at fair value. For AFS securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of other comprehensive income (loss), except when we consider declines in value to be other than temporary. For trading securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of investment income (loss), net. We recognize realized gains and losses associated with our fair value method investments using the specific identification method. We classify the cash flows related to purchases of and proceeds from the sale of trading securities based on the nature of the securities and the purpose for which they were acquired. Investments in privately held companies are generally stated at cost. We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee's operating and financial policies. Equity method investments are recorded at cost and are adjusted to recognize (i) our proportionate share of the investee's net income or losses after the date of investment, (ii) amortization of the recorded investment that exceeds our share of the book value of the investees' net assets, (iii) additional contributions made and dividends received, and (iv) impairments resulting from other-than-temporary declines in fair value. For certain investments, we record our share of the investee's net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net. We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our AFS and cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net. If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income.
Property and Equipment	Property and Equipment Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense. We capitalize the costs associated with the construction of and improvements to our cable transmission and distribution facilities and new service installations. Costs include all direct labor and materials, as well as various indirect costs. We capitalize initial customer installation costs that are directly attributable to installation of the drop, including material, labor and indirect costs, in accordance with accounting guidance related to cable television companies. All costs incurred in connection with subsequent service disconnections and reconnections are expensed as they are incurred. We record depreciation using the straight-line method over the asset's estimated useful life. See Note 7 for our significant components of property and equipment. We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeds its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.
Intangible Assets	Intangible Assets Indefinite-Lived Intangible Assets Franchise Rights Our franchise rights consist primarily of cable franchise rights. Cable franchise rights represent the value we attributed to agreements with state and local authorities that allow access to homes and businesses in cable service areas acquired in business combinations. We also have sports franchise rights, which represent the value we attributed to our professional sports team that was acquired in a business combination. We do not amortize our franchise rights because we have determined that they meet the definition of an indefinite-lived intangible asset. We reassess this determination periodically or whenever events or substantive changes in circumstances occur. Costs we incur in negotiating and renewing cable franchise agreements are included in other intangible assets and are generally amortized on a straight-line basis over the term of the franchise agreement. Other Other indefinite-lived intangible assets include trade names and FCC licenses. * * * We evaluate the recoverability of our franchise rights and other indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. We estimate the fair value of our cable franchise rights and other indefinite-lived intangible assets primarily based on a discounted cash flow analysis. In analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the value of our cable franchise rights or other indefinite-lived intangible assets were less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. We also evaluate the unit of account used to test for impairment of our cable franchise rights and other indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The Cable Communications divisions represent the units of account we use to test for impairment for our cable franchise rights. Goodwill We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the asset might be impaired. In our Cable Communications business, since components one level below the segment level (Cable Communications divisions) are not separate reporting units and have similar economic characteristics, we aggregate the components into one reporting unit at the Cable Communications segment level. In our NBCUniversal businesses, our reporting units containing goodwill are also aggregated at the segment level. The assessment of recoverability considers if the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit's goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense. Finite-Lived Intangible Assets Finite-lived intangible assets subject to amortization consist primarily of customer relationships acquired in business combinations, cable franchise renewal costs, contractual operating rights, intellectual property rights and software. These assets are amortized primarily on a straight-line basis over their estimated useful lives or the terms of the respective agreements. See Note 8 for the ranges of useful lives of our intangible assets. We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs within other intangible assets and amortize them on a straight-line basis over a period not to exceed 5 years, beginning when the asset is substantially ready for use. We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware. * * * We evaluate the recoverability of our intangible assets subject to amortization whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows is less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeds its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
Asset Retirement Obligations	Asset Retirement Obligations We recognize a liability for an asset retirement obligation in the period in which it is incurred if a reasonable estimate of fair value can be made. Certain of our cable franchise agreements and lease agreements contain provisions requiring us to restore facilities or remove property in the event that the franchise or lease agreement is not renewed. We expect to continually renew our cable franchise agreements and therefore cannot reasonably estimate any liabilities associated with such agreements. A remote possibility exists that franchise agreements could be terminated unexpectedly, which could result in us incurring significant expense in complying with restoration or removal provisions. The disposal obligations related to our properties are not material to our consolidated financial statements. We do not have any significant liabilities related to asset retirements recorded in our consolidated financial statements.
Revenue Recognition	Revenue Recognition Cable Communications Segment Our Cable Communications segment generates revenue primarily from subscriptions to our video, high-speed Internet and voice services (“cable services”) and from the sale of advertising. We recognize revenue from cable services as each service is provided. We manage credit risk by screening applicants through the use of internal customer information, identification verification tools and credit bureau data. If a customer's account is delinquent, various measures are used to collect outstanding amounts, including termination of the customer's cable service. Since installation revenue obtained from the connection of customers to our cable systems is less than related direct selling costs, we recognize revenue as connections are completed. As part of our programming license agreements with cable networks, we generally receive an allocation of scheduled advertising time that we may sell to local, regional and national advertisers. We recognize advertising revenue when the advertising is aired and based on the broadcast calendar. In most cases, the available advertising time is sold by our sales force. In some cases, we work with representation firms as an extension of our sales force to sell a portion of the advertising time allocated to us. We also coordinate the advertising sales efforts of other multichannel video providers in some markets, and in some markets we operate advertising interconnects. Since we are acting as the principal in these arrangements, we report the advertising that is sold as revenue and the fees paid to representation firms and multichannel video providers as operating costs and expenses. Revenue earned from other sources is recognized when services are provided or events occur. Under the terms of our cable franchise agreements, we are generally required to pay to the franchising authority an amount based on our gross video revenue. We normally pass these fees through to our cable customers and classify the fees as a component of revenue with the corresponding costs included in operating costs and expenses. We present other taxes imposed on a revenue-producing transaction as revenue if we are acting as the principal or as a reduction to operating costs and expenses if we are acting as an agent. Cable Networks and Broadcast Television Segments Our Cable Networks segment primarily generates revenue from the distribution of our cable network programming, the sale of advertising and the licensing and sale of our owned programming. Our Broadcast Television segment primarily generates revenue from the sale of advertising and the licensing and sale of our owned programming. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee viewer ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until such shortfall is settled, primarily by providing additional advertising time. We record revenue from the licensing of television productions when the content is available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the advertising time component of revenue when the advertisements are aired. Filmed Entertainment Segment Our Filmed Entertainment segment generates revenue from the worldwide theatrical release of our owned and acquired films, the licensing of owned and acquired films to broadcast, cable and premium networks, and the licensing and sale of our owned and acquired films on DVD and through various digital media platforms. We also generate revenue from distributing third parties' filmed entertainment, producing stage plays, publishing music and licensing consumer products. We recognize <>revenue from the theatrical distribution of films when films are exhibited. We record revenue from the licensing of a film when the content is available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the advertising time component of revenue when the advertisements are aired. We recognize revenue from DVD sales, net of estimated returns and customer incentives, on the date that DVDs are delivered to and made available for sale by retailers. Theme Parks Segment Our Theme Parks segment generates revenue primarily from theme park attendance and per capita spending, as well as from management, licensing and other fees. We recognize <>revenue from advance theme park ticket sales when the tickets are used. For multiday or annual passes, we recognize revenue over the period of benefit based on estimated usage patterns that are derived from historical experience.
Cable Communications Programming Expenses	Cable Communications Programming Expenses Cable Communications programming expenses are the fees we pay to license the programming we distribute to our video customers. Programming is acquired for distribution to our video customers, generally under multiyear distribution agreements, with rates typically based on the number of customers that receive the programming, adjusted for channel positioning and the extent of distribution. From time to time these contracts expire and programming continues to be provided under interim arrangements while the parties negotiate new contractual terms, sometimes with effective dates that affect prior periods. While payments are typically made under the prior contract's terms, the amount of our programming expenses recorded during these interim arrangements is based on our estimates of the ultimate contractual terms expected to be negotiated. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. When our Cable Communications segment receives incentives from cable networks for the licensing of their programming, we defer a portion of these incentives, which are included in other current and noncurrent liabilities, and recognize them over the term of the contract as a reduction to programming expenses, which are included in operating costs and expenses.
Advertising Expenses	Advertising Expenses Advertising costs are expensed as incurred. See Note 17 for additional information on advertising costs incurred.
Share-Based Compensation	Share-Based Compensation Our share-based compensation consists of awards of stock options and restricted share units (“RSUs”) and the discounted sale of company stock to employees through our employee stock purchase plans. For stock options and RSUs, associated costs are based on an award's estimated fair value at the date of grant and are recognized over the period in which any related services are provided. See Note 15 for additional information on our share-based compensation.
Postretirement and Pension Benefits	Postretirement and Pension Benefits We provide postretirement medical benefits for substantially all of our employees who meet certain age and service requirements. Following the close of the NBCUniversal transaction on January 28, 2011, NBCUniversal established new defined benefit plans covering the majority of its U.S. employees (the “qualified plan”) and executives (the “nonqualified plan”) and other postretirement plans, such as medical and life insurance plans. NBCUniversal's new defined benefit pension plans are currently unfunded noncontributory plans. The qualified plan is not open to new participants. As of December 31, 2011, we also sponsored two pension plans that together provided benefits to substantially all former AT&T Broadband employees. Future benefits for both pension plans have been frozen. Pension and other postretirement benefits are based on formulas that reflect the employees' years of service, compensation during their employment period and participation in the plans. The expense we recognize related to our benefit plans is determined using certain assumptions, including the expected long-term rate of return on plan assets and discount rate, among others. We recognize the funded or unfunded status of our defined benefit and other postretirement plans, other than multiemployer plans, as an asset or liability in our consolidated balance sheet and recognize changes in the funded status in the year in which the changes occur through accumulated other comprehensive income (loss). See Note 13 for additional information on our postretirement and pension benefits.
Income Taxes	Income Taxes We base our provision for income taxes on our current period income, changes in our deferred income tax assets and liabilities, income tax rates, changes in estimates of our uncertain tax positions, and tax planning opportunities available in the jurisdictions in which we operate. We recognize deferred tax assets and liabilities when there are temporary differences between the financial reporting basis and tax basis of our assets and liabilities and for the expected benefits of using net operating loss carryforwards. When a change in the tax rate or tax law has an impact on deferred taxes, we apply the change based on the years in which the temporary differences are expected to reverse. We record the change in our consolidated financial statements in the period of enactment. Income tax consequences that arise in connection with a business combination include identifying the tax basis of assets and liabilities acquired and any contingencies associated with uncertain tax positions assumed or resulting from the business combination. Deferred tax assets and liabilities related to temporary differences of an acquired entity are recorded as of the date of the business combination and are based on our estimate of the ultimate tax basis that will be accepted by the various taxing authorities. We record liabilities for contingencies associated with prior tax returns filed by the acquired entity based on criteria set forth in the accounting guidance related to accounting for uncertainty in income taxes. We adjust the deferred tax accounts and the liabilities periodically to reflect any revised estimated tax basis and any estimated settlements with the various taxing authorities. The effects of these adjustments are recorded to income tax expense. We classify interest and penalties, if any, associated with our uncertain tax positions as a component of income tax expense.
Derivative Financial Instruments	Derivative Financial Instruments We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in interest rates, foreign exchange rates and equity prices. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Derivative financial instruments are recorded in our consolidated balance sheet at fair value. We formally document, at the inception of the relationship, derivative financial instruments designated to hedge the exposure to changes in the fair value of a recognized asset or liability or an unrecognized firm commitment (“fair value hedge”) or the exposure to changes in cash flows of a forecasted transaction (“cash flow hedge”), and we evaluate them for effectiveness at the time they are designated, as well as throughout the hedging period. For derivative financial instruments designated as fair value hedges, changes in the fair value of the derivative financial instrument substantially offset changes in the fair value of the hedged item, each of which is recorded to the same line in our consolidated statement of income. When fair value hedges are terminated, sold, exercised or have expired, any gain or loss resulting from changes in the fair value of the hedged item is deferred and recognized in earnings over the remaining life of the hedged item. When the hedged item is settled or sold, the unamortized adjustment is recognized in earnings. For derivative financial instruments designated as cash flow hedges, the effective portion of the change in fair value of the derivative financial instrument is reported in accumulated other comprehensive income (loss) and recognized as an adjustment to earnings over the period in which the hedged item is recognized in our consolidated statement of income. When the hedged item is settled or becomes probable of not occurring, any remaining unrealized gain or loss from the hedge is recognized in earnings. Cash flows from hedging activities are classified under the same category as the cash flows from the hedged items in our consolidated statement of cash flows. The ineffective portion of changes in fair value for designated hedges is recognized on a current basis in earnings. For those derivative financial instruments that are not designated as hedges, changes in fair value are recognized on a current basis in earnings. Derivative financial instruments embedded in other contracts are separated from their host contract. The derivative component is recorded at its estimated fair value in our consolidated balance sheet and changes in its fair value are recognized on a current basis in earnings. We do not engage in any speculative or leveraged derivative transactions. All derivative transactions must comply with the derivatives policy approved by our Board of Directors. See Note 10 for additional information on our derivative financial instruments.
Foreign Currency Translation	Foreign Currency Translation Functional currencies are determined based on entity-specific economic and management indicators. We translate assets and liabilities of our foreign subsidiaries where the functional currency is the local currency, primarily the euro and the British pound, into U.S. dollars at the exchange rate in effect at the balance sheet date. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss). We translate revenue and expenses using average monthly exchange rates. Foreign currency transaction gains and losses are included in operating costs and expenses or other income (expense), depending on the nature of the underlying transaction
Reclassifications	Reclassifications Reclassifications have been made to the prior year's consolidated balance sheet to programming rights, other current assets, film and television costs, other intangible assets, net and other noncurrent assets, net to adjust to classifications used in the current year as a result of the acquisition of the NBCUniversal businesses.

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share

Computation of diluted EPS

Computation of Diluted EPS
		2011					2010					2009
Year ended December 31 (in millions, except per share data)		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
Basic EPS attributable to Comcast Corporation shareholders	$	4,160	2,746	$	1.51	$	3,635	2,808	$	1.29	$	3,638	2,875	$	1.27
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			32					12					10
Diluted EPS attributable to Comcast Corporation shareholders	$	4,160	2,778	$	1.50	$	3,635	2,820	$	1.29	$	3,638	2,885	$	1.26

- Definition

Tabular disclosure of the effect of income (loss) on an entity's diluted earnings per share.

+ References + Details

Acquisitions and Other Significant Events (Tables)

12 Months Ended

Dec. 31, 2011

Contingent Consideration

Contingent Consideration
(in millions)
Balance, January 28, 2011	$	590
Fair value adjustments		29
Payments		(36)
Balance, December 31, 2011	$	583

Transaction-Related Expenses

Year ended December 31 (in millions)			2011		2010
Operating costs and expenses:
	Transaction costs	$	63	$	80
	Transaction-related costs		92		-
Total operating costs and expenses			155		80
Other expense			16		129
Interest expense			-		7
Total		$	171	$	216

Unaudited Pro Forma Information

Year ended December 31 (in millions except per share amounts)		2011		2010
Revenue	$	57,661	$	55,054
Net income from consolidated operations	$	5,169	$	4,584
Net income attributable to Comcast Corporation	$	4,149	$	3,844
Basic earnings per common share attributable to Comcast Corporation shareholders	$	1.51	$	1.37
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	1.49	$	1.36

Universal Orlando [Member]

Consideration Transferred

Consideration Transferred
(in millions)
Cash	$	1,019
Fair value of 50% equity method investment in Universal Orlando		1,039
	$	2,058

Preliminary Allocation of Purchase Price
(in millions)
Property and equipment (see Note 7)	$	2,409
Intangible assets (see Note 8)		492
Working capital		242
Long-term debt (see Note 9)		(1,505)
Deferred revenue		(89)
Other noncurrent assets and liabilities		(626)
Noncontrolling interests acquired		(5)
Fair value of identifiable net assets acquired		918
Goodwill (see Note 8)		1,140
	$	2,058

NBCUniversal [Member]

Consideration Transferred

Consideration Transferred
(in millions)
Cash	$	6,120
Fair value of 49% of the Comcast Content Business		4,308
Fair value of contingent consideration		590
Fair value of redeemable noncontrolling interest associated with net assets acquired		13,071
	$	24,089

Allocation of Purchase Price
(in millions)
Film and television costs (see Note 5)	$	5,049
Investments (see Note 6)		4,339
Property and equipment (see Note7)		2,322
Intangible assets (see Note 8)		14,585
Working capital		(1,734)
Long-term debt (see Note 9)		(9,115)
Deferred income tax liabilities		(35)
Other noncurrent assets and liabilities		(2,005)
Noncontrolling interests acquired		(262)
Fair value of identifiable net assets acquired		13,144
Goodwill (see Note 8)		10,945
	$	24,089

- Definition

Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

+ References + Details

Film and Television Costs (Tables)

12 Months Ended

Dec. 31, 2011

Film And Television Costs [Abstract]

Film and Television Costs

December 31 (in millions)			2011		2010
Film Costs:
	Released, less amortization	$	1,428	$	-
	Completed, not released		148		-
	In-production and in-development		1,374		-
			2,950		-
Television Costs:
	Released, less amortization		1,002		94
	In-production and in-development		201		43
			1,203		137
Programming rights, less amortization			2,061		445
			6,214		582
Less: Current portion of programming rights			987		122
Film and television costs		$	5,227	$	460

Investments (Tables)

12 Months Ended

Dec. 31, 2011

Investments

Investment Summary

December 31 (in millions)			2011		2010
Fair Value Method		$	3,028	$	2,815
Equity Method:
	A&E Television Networks		2,021		-
	SpectrumCo		1,417		1,413
	The Weather Channel		463		-
	MSNBC.com		174		-
	Clearwire LLC		69		357
	Other		736		423
			4,880		2,193
Cost Method:
	AirTouch		1,523		1,508
	Other		477		235
			2,000		1,743
Total investments			9,908		6,751
Less: Current investments^(a)			54		81
Noncurrent investments		$	9,854	$	6,670
(a) Current investments are included in other current assets in our consolidated balance sheet.

Investment Income (Loss), Net

Investment Income (Loss), Net
Year ended December 31 (in millions)			2011		2010		2009
Gains on sales and exchanges of investments, net		$	41	$	13	$	28
Investment impairment losses			(5)		(24)		(44)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements			192		874		997
Mark to market adjustments on derivative component of prepaid forward sale
	agreements and indexed debt instruments		(119)		(665)		(807)
Interest and dividend income			110		94		102
Other, net			(60)		(4)		6
Investment income (loss), net		$	159	$	288	$	282

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property and Equipment

Property and Equipment

December 31 (in millions)	Weighted Average Original Useful Life at December 31, 2011		2011		2010
Cable distribution system	11 years	$	28,781	$	27,727
Customer premises equipment	6 years		23,552		21,716
Vehicles and other equipment	6 years		6,001		4,392
Buildings and building improvements	20 years		4,830		1,981
Land	-		923		204
Property and equipment, at cost			64,087		56,020
Less: Accumulated depreciation			36,528		32,505
Property and equipment, net		$	27,559	$	23,515

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Other Intangible Assets [Abstract]

Carrying Amount of Goodwill

Goodwill
			NBCUniversal
(in millions)		Cable Communications		Cable Networks		Broadcast Television		Filmed Entertainment		Theme Parks		Corporate and Other		Total
Balance, December 31, 2009	$	12,128	$	2,628	$	-	$	-	$	-	$	177	$	14,933
Acquisitions		81		13		-		-		-		10		104
Impairments		-		(76)		-		-		-		-		(76)
Settlements and adjustments		(2)		(1)		-		-		-		-		(3)
Balance, December 31, 2010		12,207		2,564		-		-		-		187		14,958
Acquisitions		-		10,180		772		1		1,140		-		12,093
Dispositions		-		-		-		-		-		(174)		(174)
Settlements and adjustments		1		-		-		-		-		(4)		(3)
Balance, December 31, 2011	$	12,208	$	12,744	$	772	$	1	$	1,140	$	9	$	26,874

Other Intangible Assets

				2011				2010
December 31 (in millions)		Original Useful Life at December 31, 2011		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Finite-Lived Intangible Assets:
	Customer relationships	4-20 years	$	15,079	$	(3,387)	$	6,968	$	(5,548)
	Cable franchise renewal costs and contractual operating rights	5-15 years		1,152		(581)		1,077		(608)
	Software	3-5 years		3,234		(1,839)		2,594		(1,624)
	Patents and other technology rights	3-12 years		344		(256)		307		(207)
	Other agreements and rights	3-36 years		1,379		(602)		1,272		(853)
Indefinite-Lived Intangible Assets:
	Trade names	N/A		3,006				53
	FCC licenses	N/A		636				-
Total			$	24,830	$	(6,665)	$	12,271	$	(8,840)

Amortization of Intangible Assets

(in millions)		Amortization Expense
2012	$	1,512
2013	$	1,315
2014	$	1,134
2015	$	997
2016	$	805

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References + Details

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2011

Schedule of Long-Term Debt

December 31 (in millions)	Weighted Average Interest Rate as of December 31, 2011			2011		2010
Commercial paper	0.508	%	$	550	$	-
Senior notes with maturities of 5 years or less	5.829	%		11,347		8,145
Senior notes with maturities between 6 and 10 years	5.512	%		10,689		8,381
Senior notes with maturities greater than 10 years^(a)	6.780	%		16,115		14,258
Other, including capital lease obligations	—			608		631
Total debt	5.89	%^(b)		39,309		31,415
Less: Current portion				1,367		1,800
Long-term debt			$	37,942	$	29,615
(a) The December 31, 2011 and 2010 amounts include £625 million of 5.50% notes due 2029 translated at $969 million and $976 million, respectively, using the exchange rates at these dates.
(b) Includes the effects of our derivative financial instruments.

Debt Maturities

Debt Maturities
December 31, 2011 (in millions)
2012	$	1,367
2013	$	2,411
2014	$	1,992
2015	$	3,660
2016	$	2,951
Thereafter	$	26,928

Debt Repayments and Repurchases

Debt Repayments and Repurchases
Year ended December 31, 2011 (in millions)
Comcast 6.75% notes due 2011	$	1,000
Comcast 5.5% notes due 2011		750
Universal Orlando term loan		801
Comcast 7% notes due 2055		345
Universal Orlando 8.875% notes due 2015		140
Universal Orlando 10.875% notes due 2016		79
Other		101
Total	$	3,216

Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Terms of Outstanding Fixed to Variable Swaps

Terms of Outstanding Fixed to Variable Swaps
December 31 (in millions)		2011			2010
Maturities		2012-2018			2011-2018
Notional amount	$	4,500		$	5,300
Average pay rate		4.1	%		4.8	%
Average receive rate		6.2	%		6.6	%
Estimated fair value	$	280		$	273

Amount of Gain (Loss) Recognized in Income - Fair Value Hedges

Amount of Gain (Loss) Recognized in Income
Year ended December 31 (in millions)		2011		2010
Interest Income (Expense):
Interest rate swap agreements (fixed to variable)	$	15	$	90
Long-term debt — interest rate swap agreements (fixed to variable)		(15)		(90)
Investment Income (Loss), Net:
Mark to market adjustments on derivative component of prepaid forward sale agreements		32		(49)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements		(48)		74
Gain (loss) on fair value hedging relationships	$	(16)	$	25

Pretax Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income - Cash Flow Hedges

Pretax Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income
	2011							2010
Year ended December 31 (in millions)		Interest Rate Risk		Foreign Exchange Risk		Total		Interest Rate Risk		Foreign Exchange Risk		Total
Deferred gain (loss) recognized	$	-	$	(40)	$	(40)	$	(98)	$	(29)	$	(127)
Deferred (gain) loss reclassified to income^(a)		23		8		31		34		21		55
Total change in accumulated other comprehensive income	$	23	$	(32)	$	(9)	$	(64)	$	(8)	$	(72)
(a) The interest rate risk amount in 2010 includes an $18 million loss related to a forecasted debt issuance that did not occur.

Amount of Gain (Loss) Recognized in Income - Nondesignated

Amount of Gain (Loss) Recognized in Income
Year ended December 31 (in millions)			2011		2010
Operating Costs and Expenses:
	Mark to market adjustments on foreign exchange contracts	$	(3)	$	-
Investment Income (Loss), Net:
	Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments		(151)		(616)
Other Income (Expense), Net:
	Mark to market adjustments on interest rate collars		-		15
Total gain (loss)		$	(154)	$	(601)

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Fair Value Assets and Liabilities Measured on Recurring Basis

Recurring Fair Value Measures
		Fair Value as of December 31, 2011								Fair Value as of December 31, 2010
(in millions)		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Assets
Trading securities	$	2,895	$	-	$	-	$	2,895	$	2,688	$	-	$	-	$	2,688
Available-for-sale securities		90		20		21		131		126		-		-		126
Equity warrants		-		-		2		2		-		-		1		1
Interest rate swap agreements		-		246		-		246		-		232		-		232
Foreign exchange contracts		-		10		-		10		-		-		-		-
	$	2,985	$	276	$	23	$	3,284	$	2,814	$	232	$	1	$	3,047
Liabilities
Derivative component of prepaid forward sale agreements and indexed debt instruments	$	-	$	1,234	$	-	$	1,234	$	-	$	1,029	$	-	$	1,029
Contingent consideration		-		-		583		583		-		-		-		-
Contractual obligations		-		-		1,004		1,004		-		-		-		-
Cross-currency swap agreements		-		69		-		69		-		29		-		29
Foreign exchange contracts		-		8		-		8		-		-		-		-
	$	-	$	1,311	$	1,587	$	2,898	$	-	$	1,058	$	-	$	1,058

Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2011

Noncontrolling Interests [Abstract]

Schedule Summarizing Changes in Equity Resulting from Net Income Attributable to Parent and Transfers to or from Noncontrolling Interests

Year ended December 31 (in millions)				2011		2010
Net income attributable to Comcast Corporation			$	4,160	$	3,635
Transfers from (to) noncontrolling interests:
	Increase in Comcast Corporation additional paid-in capital resulting from the issuance
		of noncontrolling equity interest		1,650		-
	Increase in Comcast Corporation additional paid-in capital resulting from the purchase
		of noncontrolling interest		-		11
Changes in equity resulting from net income attributable to Comcast Corporation and
	transfers from (to) noncontrolling interests		$	5,810	$	3,646

Postretirement, Pension and Other Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Postretirement, Pension and Other Employee Benefit Plans

Condensed Information On Our Postretirement And Pension Benefit Plans [Text Block]

			2011						2010			2009
Year ended December 31 (in millions)			Postretirement Benefits			Pension Benefits			Postretirement Benefits			Postretirement Benefits
Projected benefit obligation, beginning of the year		$	424		$	-		$	360		$	338
Projected benefit obligation, close of the NBCUniversal
	transaction		154			249			-			-
Service cost			19			99			31			27
Interest cost			30			12			21			20
Actuarial (gain) loss			(1)			71			16			(20)
Benefits paid			(8)			(4)			(4)			(5)
Projected benefit obligation, end of the year		$	618		$	427		$	424		$	360

Accumulated benefit obligation, end of the year		$	618		$	395		$	424		$	360
Plan funded status and recorded benefit obligation		$	(618)		$	(427)		$	(424)		$	(360)
Portion of benefit obligation not yet recognized in benefits
	expense	$	(17)		$	71		$	(18)		$	(36)
Discount rate			4.75	%		4.75-5.25	%		5.50	%		6.05	%

Components of Our Benefit Expense

		2011				2010		2009
Year ended December 31 (in millions)		Postretirement Benefits		Pension Benefits		Postretirement Benefits		Postretirement Benefits
Service cost	$	19	$	99	$	31	$	27
Interest cost		30		12		21		20
Amortization		(2)		-		(2)		(2)
Total benefits expense	$	47	$	111	$	50	$	45

Expected Future Benefit Payments

Expected Future Benefit Payments
(in millions)		Postretirement Benefits		Pension Benefits
2012	$	14	$	9
2013	$	16	$	11
2014	$	19	$	13
2015	$	21	$	16
2016	$	23	$	19
2017 - 2021	$	148	$	183

Condensed Information on Our Pension Benefit Plans

Year ended December 31 (in millions)		2011		2010			2009
Benefit obligation	$	211		$	197		$	184
Fair value of plan assets	$	176		$	183		$	176
Plan funded status and recorded benefit obligation	$	(35)		$	(14)		$	(8)
Portion of benefit obligation not yet recognized in benefit expense	$	66		$	51		$	46
Benefits expense	$	6		$	1		$	2
Discount rate		4.75	%		5.25	%		5.75	%
Expected return on plan assets		6.50	%		8.00	%		8.00	%

Deferred Compensation Plans

Year ended December 31 (in millions)		2011		2010		2009
Benefit obligation	$	1,059	$	935	$	849
Interest expense	$	99	$	88	$	79

Benefit Obligation and Expense for Our Split-Dollar Life Insurance Agreements

Year ended December 31 (in millions)		2011		2010		2009
Benefit obligation	$	169	$	164	$	166
Operating costs and expenses	$	27	$	16	$	37

Equity (Tables)

12 Months Ended

Dec. 31, 2011

Equity

Aggregate Share Repurchases

Share Repurchases
Year ended December 31 (in millions)		2011		2010		2009
Consideration	$	2,141	$	1,200	$	765
Shares repurchased		95		70		50

Changes in Common Stock

Changes in Common Stock Outstanding
(shares in millions)	A	A Special	B
Balance, January 1, 2009	2,061	810	9
Stock compensation plans	3	-	-
Repurchase and retirement of common stock	(5)	(45)	-
Employee stock purchase plan	4	-	-
Balance, December 31, 2009	2,063	765	9
Stock compensation plans	6	-	-
Repurchase and retirement of common stock	-	(70)	-
Employee stock purchase plan	3	-	-
Balance, December 31, 2010	2,072	695	9
Stock compensation plans	20	1	-
Repurchase and retirement of common stock	-	(95)	-
Employee stock purchase plan	3	-	-
Balance, December 31, 2011	2,095	601	9

Dividends

Dividends

2011 Dividends Declared
Year ended December 31, 2011 (in millions, except per share amounts)
Month Declared		Per Share		Amount
January	$	0.1125	$	312
May		0.1125		309
July		0.1125		307
October (paid in January 2012)		0.1125		305
Total	$	0.45	$	1,233

2010 Dividends Declared
Year ended December 31, 2010 (in millions, except per share amounts)
Month Declared		Per Share		Amount
February	$	0.0945	$	267
May		0.0945		265
July		0.0945		264
October (paid in January 2011)		0.0945		263
Total	$	0.378	$	1,059

Accumulated Other Comprehensive Income (Loss)

December 31 (in millions)		2011		2010
Unrealized gains (losses) on marketable securities	$	22	$	26
Deferred gains (losses) on cash flow hedges		(110)		(105)
Unrecognized gains (losses) on employee benefit obligations		(58)		(19)
Cumulative translation adjustments		(6)		(1)
Accumulated other comprehensive income (loss), net of deferred taxes	$	(152)	$	(99)

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation

Recognized Share-Based Compensation Expense

Recognized Share-Based Compensation Expense
Year ended December 31 (in millions)		2011		2010		2009
Stock options	$	116	$	103	$	103
Restricted share units		149		136		93
Employee stock purchase plans		13		12		13
Total	$	278	$	251	$	209
Tax benefit	$	98	$	89	$	73

Stock Option Fair Value and Significant Assumptions

		2011			2010			2009
Fair value	$	6.96		$	5.11		$	4.93
Dividend yield		1.8	%		2.1	%		1.9	%
Expected volatility		28.1	%		28.0	%		36.8	%
Risk-free interest rate		2.8	%		3.4	%		2.4	%
Expected option life (in years)		7.0			7.0			7.0

Stock Option Activity

2011 Stock Option Activity
(in thousands, except per share amounts and years)		Net Settled Options		Cash Settled Options		Weighted-Average Exercise Price	Weighted-Average Remaining Contractual Term
Class A Common Stock
Outstanding as of January 1, 2011		125,358		27,037	$	18.74
Granted		25,700		-	$	24.98
Exercised		(15,081)		(10,472)	$	18.99
Forfeited		(5,773)		(21)	$	19.19
Expired		(25)		(2,987)	$	22.47
Outstanding as of December 31, 2011		130,179		13,557	$	19.71	6.2
Weighted-average exercise price, as of December 31, 2011	$	19.75	$	19.30
Exercisable as of December 31, 2011		44,638		13,160	$	19.55	4.0
Weighted-average exercise price, as of December 31, 2011	$	19.63	$	19.27
Weighted-average remaining contractual term		4.5		2.4
Class A Special Common Stock
Outstanding as of January 1, 2011		13,963		6,557	$	22.82
Exercised		(1,905)		(833)	$	19.93
Forfeited		-		(2)	$	14.27
Expired		(5,396)		(2,539)	$	24.93
Outstanding as of December 31, 2011		6,662		3,183	$	21.92	0.2
Weighted-average exercise price, as of December 31, 2011	$	22.55	$	20.61
Exercisable as of December 31, 2011		5,852		3,146	$	21.84	0.2
Weighted-average exercise price, as of December 31, 2011	$	22.47	$	20.66
Weighted-average remaining contractual term		0.2		0.2

2011 Aggregate Intrinsic Value
(in millions)			Net Settled Options		Cash Settled Options		Total
Class A Common Stock
	Outstanding as of December 31, 2011	$	568	$	62	$	630
	Exercisable as of December 31, 2011	$	198	$	60	$	258
Class A Special Common Stock
	Outstanding as of December 31, 2011	$	7	$	10	$	17
	Exercisable as of December 31, 2011	$	7	$	9	$	16

Exercised Stock Options

Exercised Stock Options
Year ended December 31 (in millions)		2011		2010		2009
Intrinsic value of options exercised	$	156	$	8	$	-
Tax benefit of options exercised	$	58	$	3	$	-
Cash received from options exercised	$	223	$	34	$	1

Weighted Average Fair Value of Restricted Stock Units

		2011		2010		2009
Weighted-average fair value at grant date	$	22.78	$	16.94	$	13.60

Restricted Stock Plan Activity

2011 Restricted Stock Plan Activity
		Nonvested Restricted Share Unit Awards (in thousands)		Weighted-Average Fair Value at Grant Date
Class A Common Stock
Nonvested awards outstanding as of
	January 1, 2011	29,551	$	16.94
Granted		10,847	$	22.78
Vested		(8,058)	$	18.16
Forfeited		(2,455)	$	17.83
Nonvested awards outstanding as of
	December 31, 2011	29,885	$	18.65

Vested Restricted Share Units

Vested Restricted Share Units
Year ended December 31 (in millions)		2011		2010		2009
Intrinsic value of RSUs vested	$	197	$	99	$	61
Tax benefit of RSUs vested	$	69	$	36	$	22

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Components of Income Tax Expense

Components of Income Tax Expense
Year ended December 31 (in millions)			2011		2010		2009
Current expense (benefit):
	Federal	$	1,480	$	1,502	$	802
	State		359		385		(156)
	Foreign		153		-		-
			1,992		1,887		646
Deferred expense (benefit):
	Federal		658		463		945
	State		371		86		(113)
	Foreign		29		-		-
			1,058		549		832
Income tax expense		$	3,050	$	2,436	$	1,478

Schedule of Items That Effect Income Tax Expense

Year ended December 31 (in millions)		2011		2010		2009
Federal tax at statutory rate	$	2,872	$	2,136	$	1,787
State income taxes, net of federal benefit		354		204		174
Foreign income taxes, net of federal credit		89		-		-
Nontaxable income attributable to noncontrolling interests		(410)		2		-
Benefit related to certain subsidiary reorganizations		-		-		(151)
Adjustments to uncertain and effectively settled tax positions, net		77		37		(178)
Accrued interest on uncertain and effectively settled tax positions, net		66		60		(120)
Other		2		(3)		(34)
Income tax expense	$	3,050	$	2,436	$	1,478

Components of Net Deferred Tax Liability

Components of Net Deferred Tax Liability
December 31 (in millions)			2011		2010
Deferred Tax Assets:
	Net operating loss carryforwards	$	468	$	343
	Differences between book and tax basis of long-term debt		114		123
	Nondeductible accruals and other		1,583		1,301
	Less: Valuation allowance		297		207
			1,868		1,560
Deferred Tax Liabilities:
	Differences between book and tax basis of property and equipment and intangible assets		29,185		28,468
	Differences between book and tax basis of investments		616		627
	Differences between book and tax basis of indexed debt securities		560		537
	Differences between book and tax outside basis of NBCUniversal		1,214		-
			31,575		29,632
Net deferred tax liability		$	29,707	$	28,072

Reconciliation of Unrecognized Tax Benefits

Reconciliation of Unrecognized Tax Benefits
(in millions)		2011		2010		2009
Balance, January 1	$	1,251	$	1,185	$	1,450
Additions based on tax positions related to the current year		87		69		57
Additions based on tax positions related to the prior years		75		59		-
Additions from acquired subsidiaries		57		-		-
Reductions for tax positions of prior years		(22)		(28)		(257)
Reductions due to expiration of statute of limitations		(5)		(24)		-
Settlements with taxing authorities		(8)		(10)		(65)
Balance, December 31	$	1,435	$	1,251	$	1,185

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Supplemental Financial Information (Tables)

12 Months Ended

Dec. 31, 2011

Supplemental Financial Information [Abstract]

Receivable

Receivables
December 31 (in millions)		2011		2010
Receivables, gross	$	4,978	$	2,028
Less: Allowance for returns and customer incentives		425		-
Less: Allowance for doubtful accounts		202		173
Receivables, net	$	4,351	$	1,855

Operating Costs and Expenses (Excluding Depreciation and Amortization)

Operating Costs and Expenses
Year ended December 31 (in millions)		2011		2010		2009
Programming and production	$	16,623	$	8,555	$	7,846
Cable Communications technical labor		2,280		2,263		2,295
Cable Communications customer service		1,855		1,833		1,881
Advertising, marketing and promotion		4,240		2,415		2,056
Other		12,487		8,275		7,964
Operating costs and expenses (excluding depreciation and amortization)	$	37,485	$	23,341	$	22,042

Cash Payments For Interest and Income Taxes

Cash Payments for Interest and Income Taxes
Year ended December 31 (in millions)		2011		2010		2009
Interest	$	2,441	$	1,983	$	2,040
Income taxes	$	1,626	$	1,864	$	1,303

Receivables Monetization (Tables)

12 Months Ended

Dec. 31, 2011

Receivables Monetization [Abstract]

Effect on Income From Receivables Monetization and Cash Flows on Transfers

Effect on Income from Receivables Monetization and Cash Flows on Transfers
Year ended December 31 (in millions)		2011
Net (loss) gain on sale^(a)	$	(36)
Net cash proceeds (payments) on transfers^(b)	$	(237)

Receivables Monetized and Deferred Consideration

Receivables Monetized and Deferred Consideration
December 31 (in millions)		2011
Monetized receivables sold	$	961
Deferred consideration	$	268

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2011

Commitments and Contingencies [Abstract]

Commitments Disclosure [Table Text Block]

As of December 31, 2011 (in millions)		Programming and Talent Commitments		Operating Leases
2012	$	4,793	$	548
2013	$	2,388	$	448
2014	$	2,887	$	388
2015	$	1,976	$	333
2016	$	3,104	$	320
Thereafter	$	17,301	$	1,410

Rental Expense [Table Text Block]

The table below presents our rental expense charged to operations.

Year ended December 31 (in millions)		2011		2010		2009
Rental expense	$	570	$	424	$	418

Financial Data by Business Segment (Tables)

12 Months Ended

Dec. 31, 2011

Financial Data By Business Segment [Abstract]

Financial Data by Business Segment

(in millions)			Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures		Assets^(h)
2011
Cable Communications^(a)		$	37,226	$	15,288	$	6,395	$	8,893	$	4,806	$	120,729
NBCUniversal
	Cable Networks^(b)		8,108		3,185		718		2,467		48		29,578
	Broadcast Television^(c)		5,935		138		79		59		61		6,213
	Filmed Entertainment^(c)		4,239		27		20		7		6		3,891
	Theme Parks^(c)		1,874		830		146		684		154		6,197
	Headquarters and Other^(d)		45		(484)		168		(652)		165		5,443
	Eliminations^(e)		(941)		(234)		1		(235)		-		(538)
NBCUniversal			19,260		3,462		1,132		2,330		434		50,784
Corporate and Other^(c)			558		(416)		93		(509)		67		6,224
Eliminations^(e)			(1,202)		23		16		7		-		(19,919)
Comcast Consolidated		$	55,842	$	18,357	$	7,636	$	10,721	$	5,307	$	157,818

(in millions)		Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
2010
Cable Communications^(a)	$	35,363	$	14,302	$	6,232	$	8,070	$	4,853
Cable Networks^(b)		2,719		732		323		409		51
Corporate and Other^(c)		168		(438)		61		(499)		57
Eliminations^(e)		(313)		-		-		-		-
Comcast Consolidated	$	37,937	$	14,596	$	6,616	$	7,980	$	4,961

(in millions)		Revenue^(f)		Operating Income (Loss) Before Depreciation and Amortization^(g)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
2009
Cable Communications^(a)	$	33,544	$	13,459	$	6,199	$	7,260	$	5,031
Cable Networks^(b)		2,415		606		278		328		55
Corporate and Other^(c)		49		(351)		23		(374)		31
Eliminations^(e)		(252)		-		-		-		-
Comcast Consolidated	$	35,756	$	13,714	$	6,500	$	7,214	$	5,117

Cable Segment Revenue Sources

		2011		2010		2009
Residential:
	Video	52.7	%	54.8	%	57.5	%
	High-speed Internet	23.5	%	22.5	%	21.7	%
	Voice	9.4	%	9.3	%	9.2	%
Advertising		5.4	%	5.7	%	4.8	%
Business services		4.8	%	3.6	%	2.5	%
Other		4.2	%	4.1	%	4.3	%
Total		100	%	100	%	100	%

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information

Quarterly Financial Information (Unaudited)

(in millions, except per share data)		First Quarter		Second Quarter		Third Quarter		Fourth Quarter		Total Year
2011
Revenue	$	12,128	$	14,333	$	14,339	$	15,042	$	55,842
Operating income	$	2,224	$	2,938	$	2,641	$	2,918	$	10,721
Net income attributable to Comcast Corporation	$	943	$	1,022	$	908	$	1,287	$	4,160
Basic earnings per common share attributable to Comcast Corporation shareholders	$	0.34	$	0.37	$	0.33	$	0.47	$	1.51
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	0.34	$	0.37	$	0.33	$	0.47	$	1.50
Dividends declared per common share attributable to Comcast Corporation shareholders	$	0.1125	$	0.1125	$	0.1125	$	0.1125	$	0.45
2010
Revenue	$	9,202	$	9,525	$	9,489	$	9,721	$	37,937
Operating income	$	1,935	$	2,078	$	1,954	$	2,013	$	7,980
Net income attributable to Comcast Corporation	$	866	$	884	$	867	$	1,018	$	3,635
Basic earnings per common share attributable to Comcast Corporation shareholders	$	0.31	$	0.31	$	0.31	$	0.37	$	1.29
Diluted earnings per common share attributable to Comcast Corporation shareholders	$	0.31	$	0.31	$	0.31	$	0.36	$	1.29
Dividends declared per common share attributable to Comcast Corporation shareholders	$	0.0945	$	0.0945	$	0.0945	$	0.0945	$	0.378

Condensed Consolidating Financial Information (Tables)

12 Months Ended

Dec. 31, 2011

Condensed Consolidating Financial Information [Abstract]

Schedule of Condensed Consolidating Balance Sheets

Condensed Consolidating Balance Sheet
December 31, 2011
(in millions)			Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Assets
	Cash and cash equivalents	$	-	$	-	$	-	$	-	$	1,620	$	-	$	1,620
	Receivables, net		-		-		-		-		4,351		-		4,351
	Programming rights		-		-		-		-		987		-		987
	Other current assets		235		8		3		-		1,369		-		1,615
Total current assets			235		8		3		-		8,327		-		8,573
Film and television costs			-		-		-		-		5,227		-		5,227
Investments			-		-		-		-		9,854		-		9,854
Investments in and amounts due from subsidiaries eliminated upon consolidation			71,222		89,568		45,725		88,336		36,949		(331,800)		-
Property and equipment, net			262		-		-		-		27,297		-		27,559
Franchise rights			-		-		-		-		59,376		-		59,376
Goodwill			-		-		-		-		26,874		-		26,874
Other intangible assets, net			9		-		-		-		18,156		-		18,165
Other noncurrent assets, net			912		30		5		148		1,761		(666)		2,190
Total assets		$	72,640	$	89,606	$	45,733	$	88,484	$	193,821	$	(332,466)	$	157,818

Liabilities and Equity
	Accounts payable and accrued expenses related to trade creditors	$	10	$	-	$	-	$	-	$	5,695	$	-	$	5,705
	Accrued participations and residuals		-		-		-		-		1,255		-		1,255
	Accrued expenses and other current liabilities		1,030		189		77		272		3,346		-		4,914
	Current portion of long-term debt		26		-		554		202		585		-		1,367
Total current liabilities			1,066		189		631		474		10,881		-		13,241
Long-term debt, less current portion			22,451		3,953		1,764		111		9,663		-		37,942
Deferred income taxes			-		-		-		727		29,728		(523)		29,932
Other noncurrent liabilities			1,849		-		-		-		11,328		(143)		13,034
Redeemable noncontrolling interests			-		-		-		-		16,014		-		16,014
Equity:
	Common stock		32		-		-		-		-		-		32
	Other shareholders’ equity		47,242		85,464		43,338		87,172		115,826		(331,800)		47,242
Total Comcast Corporation shareholders’ equity			47,274		85,464		43,338		87,172		115,826		(331,800)		47,274
Noncontrolling interests			-		-		-		-		381		-		381
Total equity			47,274		85,464		43,338		87,172		116,207		(331,800)		47,655
Total liabilities and equity		$	72,640	$	89,606	$	45,733	$	88,484	$	193,821	$	(332,466)	$	157,818

Condensed Consolidating Balance Sheet
December 31, 2010
(in millions)			Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Assets
	Cash and cash equivalents	$	-	$	-	$	-	$	-	$	5,984	$	-	$	5,984
	Receivables, net		-		-		-		-		1,855		-		1,855
	Programming rights		-		-		-		-		122		-		122
	Other current assets		162		-		-		-		763		-		925
Total current assets			162		-		-		-		8,724		-		8,886
Film and television costs			-		-		-		-		460		-		460
Investments			-		-		-		-		6,670		-		6,670
Investments in and amounts due from subsidiaries eliminated upon consolidation			68,987		90,076		52,652		72,629		12,339		(296,683)		-
Property and equipment, net			278		-		-		-		23,237		-		23,515
Franchise rights			-		-		-		-		59,442		-		59,442
Goodwill			-		-		-		-		14,958		-		14,958
Other intangible assets, net			10		-		-		-		3,421		-		3,431
Other noncurrent assets, net			1,128		45		-		148		670		(819)		1,172
Total assets		$	70,565	$	90,121	$	52,652	$	72,777	$	129,921	$	(297,502)	$	118,534

Liabilities and Equity
	Accounts payable and accrued expenses related to trade creditors	$	6	$	3	$	-	$	-	$	3,282	$	-	$	3,291
	Accrued expenses and other current liabilities		1,038		187		74		266		1,578		-		3,143
	Current portion of long-term debt		755		1,000		-		-		45		-		1,800
Total current liabilities			1,799		1,190		74		266		4,905		-		8,234
Long-term debt, less current portion			22,754		3,963		2,339		310		249		-		29,615
Deferred income taxes			-		-		-		704		28,218		(676)		28,246
Other noncurrent liabilities			1,658		-		-		-		6,347		(143)		7,862
Redeemable noncontrolling interests			-		-		-		-		143		-		143
Equity:
	Common stock		32		-		-		-		-		-		32
	Other shareholders’ equity		44,322		84,968		50,239		71,497		89,979		(296,683)		44,322
Total Comcast Corporation shareholders’ equity			44,354		84,968		50,239		71,497		89,979		(296,683)		44,354
Noncontrolling interests			-		-		-		-		80		-		80
Total equity			44,354		84,968		50,239		71,497		90,059		(296,683)		44,434
Total liabilities and equity		$	70,565	$	90,121	$	52,652	$	72,777	$	129,921	$	(297,502)	$	118,534

Schedule of Condensed Consolidating Statement of Operations

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2011
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	55,842	$	-	$	55,842
Management fee revenue		800		784		488		-		-		(2,072)		-
		800		784		488		-		55,842		(2,072)		55,842
Costs and Expenses:
Operating costs and expenses		420		784		488		5		37,860		(2,072)		37,485
Depreciation		29		-		-		-		6,011		-		6,040
Amortization		3		-		-		-		1,593		-		1,596
		452		784		488		5		45,464		(2,072)		45,121
Operating income (loss)		348		-		-		(5)		10,378		-		10,721
Other Income (Expense):
Interest expense		(1,439)		(338)		(172)		(32)		(524)		-		(2,505)
Investment income (loss), net		3		-		-		2		154		-		159
Equity in net income (losses) of investees, net		4,879		5,598		3,361		5,734		(35)		(19,572)		(35)
Other income (expense), net		(19)		-		-		1		(115)		-		(133)
		3,424		5,260		3,189		5,705		(520)		(19,572)		(2,514)
Income (loss) before income taxes		3,772		5,260		3,189		5,700		9,858		(19,572)		8,207
Income tax (expense) benefit		388		118		60		12		(3,628)		-		(3,050)
Net income (loss) from consolidated operations		4,160		5,378		3,249		5,712		6,230		(19,572)		5,157
Net (income) loss attributable to noncontrolling interests		-		-		-		-		(997)		-		(997)
Net income (loss) attributable to Comcast Corporation	$	4,160	$	5,378	$	3,249	$	5,712	$	5,233	$	(19,572)	$	4,160

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2010
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	37,937	$	-	$	37,937
Management fee revenue		808		726		452		-		-		(1,986)		-
		808		726		452		-		37,937		(1,986)		37,937
Costs and Expenses:
Operating costs and expenses		444		726		452		59		23,646		(1,986)		23,341
Depreciation		29		-		-		-		5,510		-		5,539
Amortization		3		-		-		-		1,074		-		1,077
		476		726		452		59		30,230		(1,986)		29,957
Operating income (loss)		332		-		-		(59)		7,707		-		7,980
Other Income (Expense):
Interest expense		(1,402)		(402)		(173)		(33)		(146)		-		(2,156)
Investment income (loss), net		8		-		-		7		273		-		288
Equity in net income (losses) of investees, net		4,329		4,741		3,015		4,675		(141)		(16,760)		(141)
Other income (expense), net		(5)		-		-		-		138		-		133
		2,930		4,339		2,842		4,649		124		(16,760)		(1,876)
Income (loss) before income taxes		3,262		4,339		2,842		4,590		7,831		(16,760)		6,104
Income tax (expense) benefit		373		141		61		30		(3,041)		-		(2,436)
Net income (loss) from consolidated operations		3,635		4,480		2,903		4,620		4,790		(16,760)		3,668
Net (income) loss attributable to noncontrolling interests		-		-		-		-		(33)		-		(33)
Net income (loss) attributable to Comcast Corporation	$	3,635	$	4,480	$	2,903	$	4,620	$	4,757	$	(16,760)	$	3,635

Condensed Consolidating Statement of Income
For the Year Ended December 31, 2009
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
Service revenue	$	-	$	-	$	-	$	-	$	35,756	$	-	$	35,756
Management fee revenue		768		678		439		-		-		(1,885)		-
		768		678		439		-		35,756		(1,885)		35,756
Costs and Expenses:
Operating costs and expenses		362		678		439		57		22,391		(1,885)		22,042
Depreciation		29		-		-		-		5,454		-		5,483
Amortization		-		-		-		-		1,017		-		1,017
		391		678		439		57		28,862		(1,885)		28,542
Operating income (loss)		377		-		-		(57)		6,894		-		7,214
Other Income (Expense):
Interest expense		(1,296)		(666)		(223)		(29)		(134)		-		(2,348)
Investment income (loss), net		3		-		-		8		271		-		282
Equity in net income (losses) of investees, net		4,233		4,913		3,275		4,781		(64)		(17,202)		(64)
Other income (expense), net		-		-		-		-		22		-		22
		2,940		4,247		3,052		4,760		95		(17,202)		(2,108)
Income (loss) before income taxes		3,317		4,247		3,052		4,703		6,989		(17,202)		5,106
Income tax (expense) benefit		321		233		78		27		(2,137)		-		(1,478)
Net income (loss) from consolidated operations		3,638		4,480		3,130		4,730		4,852		(17,202)		3,628
Net (income) loss attributable to noncontrolling interests		-		-		-		-		10		-		10
Net income (loss) attributable to Comcast Corporation	$	3,638	$	4,480	$	3,130	$	4,730	$	4,862	$	(17,202)	$	3,638

Schedule of Condensed Consolidating Statement of Cash Flows

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2011
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(513)	$	(209)	$	(131)	$	(19)	$	15,217	$	-	$	14,345
Investing Activities:
Net transactions with affiliates		4,615		1,209		131		19		(5,974)		-		-
Capital expenditures		(7)		-		-		-		(5,300)		-		(5,307)
Cash paid for intangible assets		(2)		-		-		-		(952)		-		(954)
Acquisitions, net of cash acquired		-		-		-		-		(6,407)		-		(6,407)
Proceeds from sales of businesses and investments		-		-		-		-		277		-		277
Purchases of investments		-		-		-		-		(135)		-		(135)
Other		-		-		-		-		18		-		18
Net cash provided by (used in) investing activities		4,606		1,209		131		19		(18,473)		-		(12,508)
Financing Activities:
Proceeds from (repayments of) short-term borrowings, net		(4)		-		-		-		548		-		544
Proceeds from borrowings		-		-		-		-		-		-		-
Repurchases and repayments of debt		(1,095)		(1,000)		-		-		(1,121)		-		(3,216)
Repurchases and retirements of common stock		(2,141)		-		-		-		-		-		(2,141)
Dividends paid		(1,187)		-		-		-		-		-		(1,187)
Issuances of common stock		283		-		-		-		-		-		283
Distributions to noncontrolling interests		-		-		-		-		(325)		-		(325)
Other		51		-		-		-		(210)		-		(159)
Net cash provided by (used in) financing activities		(4,093)		(1,000)		-		-		(1,108)		-		(6,201)
Increase (decrease) in cash and cash equivalents		-		-		-		-		(4,364)		-		(4,364)
Cash and cash equivalents, beginning of year		-		-		-		-		5,984		-		5,984
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	1,620	$	-	$	1,620

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2010
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(391)	$	(257)	$	(132)	$	(235)	$	12,194	$	-	$	11,179
Investing Activities:
Net transactions with affiliates		488		257		132		248		(1,125)		-		-
Capital expenditures		(7)		-		-		-		(4,954)		-		(4,961)
Cash paid for intangible assets		(2)		-		-		-		(534)		-		(536)
Acquisitions, net of cash acquired		-		-		-		-		(183)		-		(183)
Proceeds from sales of businesses and investments		-		-		-		-		99		-		99
Purchases of investments		-		-		-		-		(260)		-		(260)
Other		-		-		-		-		130		-		130
Net cash provided by (used in) investing activities		479		257		132		248		(6,827)		-		(5,711)
Financing Activities:
Proceeds from borrowings		3,390		-		-		-		30		-		3,420
Repurchases and repayments of debt		(1,100)		-		-		(13)		(40)		-		(1,153)
Repurchases and retirements of common stock		(1,200)		-		-		-		-		-		(1,200)
Dividends paid		(1,064)		-		-		-		-		-		(1,064)
Issuances of common stock		34		-		-		-		-		-		34
Distributions to noncontrolling interests		-		-		-		-		(67)		-		(67)
Other		(148)		-		-		-		23		-		(125)
Net cash provided by (used in) financing activities		(88)		-		-		(13)		(54)		-		(155)
Increase (decrease) in cash and cash equivalents		-		-		-		-		5,313		-		5,313
Cash and cash equivalents, beginning of year		-		-		-		-		671		-		671
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	5,984	$	-	$	5,984

Condensed Consolidating Statement of Cash Flows
For the Year Ended December 31, 2009
(in millions)		Comcast Parent		CCCL Parent		Combined CCHMO Parents		Comcast Holdings		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	115	$	(472)	$	(185)	$	3	$	10,820	$	-	$	10,281
Investing Activities:
Net transactions with affiliates		1,215		3,438		539		259		(5,451)		-		-
Capital expenditures		(25)		-		-		-		(5,092)		-		(5,117)
Cash paid for intangible assets		(11)		-		-		-		(511)		-		(522)
Acquisitions, net of cash acquired		-		-		-		-		(88)		-		(88)
Proceeds from sales of businesses and investments		-		-		-		-		102		-		102
Purchases of investments		-		-		-		-		(346)		-		(346)
Other		-		-		-		-		74		-		74
Net cash provided by (used in) investing activities		1,179		3,438		539		259		(11,312)		-		(5,897)
Financing Activities:
Proceeds from borrowings		1,492		-		-		-		72		-		1,564
Repurchases and repayments of debt		(1,241)		(2,836)		(312)		(262)		(87)		-		(4,738)
Repurchases and retirements of common stock		(765)		-		-		-		-		-		(765)
Dividends paid		(761)		-		-		-		-		-		(761)
Issuances of common stock		1		-		-		-		-		-		1
Distributions to noncontrolling interests		-		-		-		-		(49)		-		(49)
Other		(20)		(130)		(42)		-		32		-		(160)
Net cash provided by (used in) financing activities		(1,294)		(2,966)		(354)		(262)		(32)		-		(4,908)
Increase (decrease) in cash and cash equivalents		-		-		-		-		(524)		-		(524)
Cash and cash equivalents, beginning of year		-		-		-		-		1,195		-		1,195
Cash and cash equivalents, end of year	$	-	$	-	$	-	$	-	$	671	$	-	$	671

Schedule II Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Schedule II-Valuation and Qualifying Accounts

Comcast Corporation and Subsidiaries
Schedule II—Valuation and Qualifying Accounts
Year ended December 31, 2011, 2010 and 2009

Year Ended December 31 (in millions)			Balance at Beginning of Year	Additions Charged to Costs and Expenses	Deductions from Reserves		Balance at End of Year

2011
	Allowance for doubtful accounts	$	173	306	277	$	202
	Sales returns and allowances		-	536	111		425
2010
	Allowance for doubtful accounts	$	175	327	329	$	173
2009
	Allowance for doubtful accounts	$	190	385	400	$	175

Organization and Business (Details) numberofcustomers in Millions	12 Months Ended
	Dec. 31, 2011 numberofcustomers numberofnetworks
Ownership percentage	51.00%
Number of regional sports and news networks \| numberofnetworks	13
Video Customers [Member]
Number of customers	22.3
High-speed Internet Customers [Member]
Number of customers	18.1
Phone Customers [Member]
Number of customers	9.3

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share
Excluded shares from diluted EPS because their inclusion would have an antidilutive effect									45	168	195
Net income attributable to Comcast Corporation	$ 1,287	$ 908	$ 1,022	$ 943	$ 1,018	$ 867	$ 884	$ 866	$ 4,160	$ 3,635	$ 3,638
Basic shares attributable to Comcast Corporation shareholders									2,746	2,808	2,875
Assumed exercise or issuance of shares relating to stock plans									32	12	10
Diluted shares attributable to Comcast Corporation shareholders									2,778	2,820	2,885
Basic earnings per common share attributable to Comcast Corporation shareholders	$ 0.47	$ 0.33	$ 0.37	$ 0.34	$ 0.37	$ 0.31	$ 0.31	$ 0.31	$ 1.51	$ 1.29	$ 1.27
Diluted earnings per common share attributable to Comcast Corporation shareholders	$ 0.47	$ 0.33	$ 0.37	$ 0.34	$ 0.36	$ 0.31	$ 0.31	$ 0.31	$ 1.50	$ 1.29	$ 1.26

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1252-109256

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=6945512&loc=d3e4984-109258

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.23)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 87-21
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e565-108580

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Acquisitions and Other Significant Events (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 28, 2011	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Item]
Ownership percentage		51.00%
Cash payment including transaction-related cost	$ 6,200
The purchase price to be paid in connection with any purchase described in this paragraph will be equal to the ownership percentage being purchased multiplied by an amount equal to 120% of the fully distributed public market trading value of NBCUniversal Holdings (determined pursuant to an appraisal process if NBCUniversal Holdings is not then publicly traded), less 50% of an amount (not less than zero) equal to the excess of 120% of the fully distributed public market trading value over $28.4 billion	120.00%
Amount used for determining redemption and purchase price	$ 28,400
Cash or common stock funding commitment for each of the two GE redemption rights	2,875
Aggregate cash or common stock funding commitment for noncontrolling investor redemption rights	5,750
Measurement period decrease in goodwill		$ 1,100
Deferred tax on exchange transaction	576
Contingent consideration	590	$ 583	$ 0
NBCUniversal [Member]
Business Acquisition [Line Item]
Deferred income tax liabilities	(35)
Contingent consideration	590
Remaining equity interest acquired		50.00%
Total cost of acquired entity	$ 6,120	$ 1,000
Intercompany note		250
Revenue attributable to acquired company		14,500
Net income (loss) attributable to acquired company		$ 493
Universal Orlando [Member]
Business Acquisition [Line Item]
Remaining equity interest acquired		50.00%
Total cost of acquired entity		$ 1,019
Carrying value of our investment		1,000
Revenue attributable to acquired company		712
Net income (loss) attributable to acquired company		$ 42
GE [Member]
Business Acquisition [Line Item]
GE ownership percentage in new company formed in connection with the NBC Universal transaction		49.00%

Acquisitions and Other Significant Events (Consideration Transferred) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Jan. 28, 2011	Dec. 31, 2010
Fair value of 49% of the Comcast Content Business		$ 4,308
Fair value of contingent consideration	$ 583	590	$ 0
Fair value of redeemable noncontrolling interest associated with net assets acquired		$ 13,071

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph f
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph g(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 29, 30, 41, 42, 64
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 65
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 30
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4237-128469

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 25
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3629-128468

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6910684&loc=d3e4570-128470

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(3),(c)(1)
-URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 30
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=6910544&loc=d3e4243-128469

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 25
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6946367&loc=d3e3642-128468

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 40
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6910732&loc=d3e4805-128471

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

Acquisitions and Other Significant Events (Allocation of Purchase Price) (Details) - NBCUniversal [Member] $ in Millions	Jan. 28, 2011 USD ($)
Business Acquisition [Line Items]
Film and television costs (see Note 5)	$ 5,049
Investments (see Note 6)	4,339
Property and equipment (see Note 17)	2,322
Intangible assets (see Note 8)	14,585
Working Capital	(1,734)
Long-term debt (see Note 9)	(9,115)
Deferred income tax liabilities	(35)
Other noncurrent assets and liabilities	(2,005)
Noncontrolling interests acquired	(262)
Fair value of identifiable net assets acquired	13,144
Goodwill	10,945
Assets and liabilities acquired, total	$ 24,089

Acquisitions and Other Significant Events (Contingent Consideration)(Details) $ in Millions	11 Months Ended
	Dec. 31, 2011 USD ($)
Acquisition And Other Significant Events Details [Abstract]
Balance, January 28, 2011	$ 590
Fair value adjustments	29
Payments	(36)
Balance, December 31, 2011	$ 583

- Definition

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

+ Details

Acquisitions and Other Significant Events (Transaction-Related Expenses)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Acquisition And Other Significant Events Details [Abstract]
Transaction costs	$ 63	$ 80
Transacation-related costs	92	0
Total operating costs and expenses	155	80
Other expense	16	129
Interest expense	0	7
Total	$ 171	$ 216

Acquisitions and Other Significant Events (Consideration Transferred Universal Orlando) (Details) - Universal Orlando [Member] $ in Millions	Dec. 31, 2011 USD ($)
Cash	$ 1,019
Fair value of 50% equity method investment in Universal Orlando	1,039
Total consideration transferred	$ 2,058

Acquisitions and Other Significant Events (Preliminary Allocation of Purchase Price Universal Orlando)(Details) - Universal Orlando [Member] $ in Millions	Dec. 31, 2011 USD ($)
Business Acquisition [Line Items]
Property and equipment (see Note 17)	$ 2,409
Intangible assets (see Note 8)	492
Working Capital	242
Long-term debt (see Note 9)	(1,505)
Deferred revenue	(89)
Other noncurrent assets and liabilities	(626)
Noncontrolling interests acquired	(5)
Fair value of identifiable net assets acquired	918
Goodwill	1,140
Assets and liabilities acquired, total	$ 2,058

Acquisitions and Other Significant Events (Pro Forma Information)(Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Revenue	$ 57,661	$ 55,054
Net income from consolidated operations	5,169	4,584
Net income attributable to Comcast Corporation	$ 4,149	$ 3,844
Basic earnings per common share attributable to Comcast Corporation shareholders	$ 1.51	$ 1.37
Diluted earnings per common share attributable to Comcast Corporation shareholders	$ 1.49	$ 1.36

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References + Details

Film and Television Costs (Narrative Details) $ in Millions	Dec. 31, 2011 USD ($)
Amortization of original film and television production expected to be amortized during the next fiscal year	$ 896
Percentage of unamortized film and television costs for released productions to be amortized in the next three years	89.00%
Unamortized film and television libraries	$ 1,000
Percentage of acquired film and television libraries to be amortized in the next three years	43.00%

Film and Television Costs (Film and Television Costs)(Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Film And Television Costs [Line Items]
Programming rights, less amortization	$ 2,061	$ 445
Total film costs, television costs and programming rights	6,214	582
Less: Current portion of programming rights	987	122
Film and television costs	5,227	460
Film Costs [Member]
Film And Television Costs [Line Items]
Released, less amortization	1,428	0
Completed, not released	148	0
In-production and in-development	1,374	0
Total film costs	2,950	0
Television Costs [Member]
Film And Television Costs [Line Items]
Released, less amortization	1,002	94
Completed, not released	0	0
In-production and in-development	201	43
Total television costs	$ 1,203	$ 137

Investments (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Fair value method	$ 3,028	$ 2,815
Equity method	4,880	2,193
Cost method	2,000	1,743
Total Investments	9,908	6,751
Less: Current investments	54	81
Noncurrent investments	9,854	6,670
Spectrum Co, LLC [Member]
Equity method	1,417	1,413
Clearwire LLC [Member]
Equity method	69	357
Other Equity Method Investments [Member]
Equity method	736	423
Air Touch [Member]
Cost method	1,523	1,508
Other Cost Method Investment [Member]
Cost method	477	235
A E Television Networks LLC [Member]
Equity method	2,021	0
The Weather Channel [Member]
Equity method	463	0
Msnbccom [Member]
Equity method	$ 174	$ 0

Investments (Fair Value Method Investments) (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Prepaid Forward Sale Obligations [Member]
Prepaid forward sale obligations fair value	$ 2.5	$ 2.4
Fair Value Method [Member]
Equity securities held as collateral	$ 3.0
Percentage of fair value debt and equity securities held as collateral	98.50%

Investments (Equity Method Investments) (Details) - USD ($) $ in Billions		12 Months Ended
	Nov. 01, 2006	Dec. 31, 2011
Spectrum Co, LLC [Member]
Equity method investment ownership percentage		64.00%
Number of wireless spectrum licenses		137
Total cost to purchase the licenses	$ 1.3
Clearwire LLC [Member]
Equity method investment ownership percentage		6.00%
A E Television Networks LLC [Member]
Equity method investment ownership percentage		16.00%
Percentage of cash received from investees		57.00%
Msnbccom [Member]
Equity method investment ownership percentage		50.00%
The Weather Channel [Member]
Equity method investment ownership percentage		25.00%
NBCUniversal [Member]
Difference between carrying amount and net assets		$ 1.9
Spectrum Co, LLC [Member]
Cash paid by equity method investment for intangible assets		2.4
Expected proceeds received by equity method investment for sale of intangible assets		3.6
Expected proceeds from sale of equity method investment		$ 2.3

Investments (Cost Method Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Redeemable noncontrolling interests	$ 16,014	$ 143
Air Touch [Member]
AirTouch preferred stock	1,800	1,700
Aggregate redemption value	1,750
Carrying amount of redeemable preferred stock	1,500	1,500
Fair value amount of redeemable preferred stock	1,800	1,700
Nonredeemable preferred stock	100	$ 100
Preferred Shares Redeemable in April 2020 [Member]
Aggregate redemption value	$ 1,650

- Definition

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 43
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 43
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 27
-Appendix A
-Subparagraph c

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (12)(c)
-Section S99
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=6802392&loc=SL6540498-122764

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph 14
-Paragraph 3A
-Section S99
-URI http://asc.fasb.org/extlink&oid=6802392&loc=SL6540498-122764

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph 15
-Paragraph 3A
-Section S99
-URI http://asc.fasb.org/extlink&oid=6802392&loc=SL6540498-122764

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (16)(c)
-Paragraph 3A
-Section S99
-URI http://asc.fasb.org/extlink&oid=6802392&loc=SL6540498-122764

+ Details

Investments (Investment Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments
Gains on sales and exchanges of investments, net	$ 41	$ 13	$ 28
Investment impairment losses	(5)	(24)	(44)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements	192	874	997
Mark to market adjustments on derivative component of prepaid forward sale agreements	(119)	(665)	(807)
Interest and dividend income	110	94	102
Other, net	(60)	(4)	6
Investment income (loss), net	$ 159	$ 288	$ 282

- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e25351-111560

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 16B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-2/124-2
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Property and Equipment (Details) $ in Millions	Dec. 31, 2011 USD ($) numberofyears	Dec. 31, 2010 USD ($)
Cable distribution system	$ 28,781	$ 27,727
Customer premises equipment	23,552	21,716
Vehicles and other equipment	6,001	4,392
Buildings and building improvements	4,830	1,981
Land	923	204
Property and equipment, at cost	64,087	56,020
Less: Accumulated depreciation	(36,528)	(32,505)
Property and equipment, net	$ 27,559	$ 23,515
Cable Distribution System [Member]
Weighted average original useful life (in years) \| numberofyears	11
Customer Premises Equipment [Member]
Weighted average original useful life (in years) \| numberofyears	6
Vehicles And Other Equipment [Member]
Weighted average original useful life (in years) \| numberofyears	6
Building and Building Improvements [Member]
Weighted average original useful life (in years) \| numberofyears	20

Goodwill and Other Intangible Assets (Carrying Amount of Goodwill)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Goodwill beginning balance	$ 14,958	$ 14,933
Acquisitions	12,093	104
Dispositions	(174)
Impairments		(76)
Settlements and adjustments	(3)	(3)
Goodwill ending balance	26,874	14,958
Cable Communications [Member]
Goodwill beginning balance	12,207	12,128
Acquisitions	0	81
Dispositions	0
Impairments		0
Settlements and adjustments	1	(2)
Goodwill ending balance	12,208	12,207
Cable Networks [Member]
Goodwill beginning balance	2,564	2,628
Acquisitions	10,180	13
Dispositions	0
Impairments		(76)
Settlements and adjustments		(1)
Goodwill ending balance	12,744	2,564
Broadcast Television [Member]
Goodwill beginning balance	0	0
Acquisitions	772	0
Dispositions	0
Impairments		0
Settlements and adjustments	0	0
Goodwill ending balance	772	0
Filmed Entertainment [Member]
Goodwill beginning balance	0	0
Acquisitions	1	0
Dispositions	0
Impairments		0
Settlements and adjustments	0	0
Goodwill ending balance	1	0
Theme Parks [Member]
Goodwill beginning balance	0	0
Acquisitions	1,140	0
Dispositions	0
Impairments		0
Settlements and adjustments	0	0
Goodwill ending balance	1,140	0
Corporate and Other [Member]
Goodwill beginning balance	187	177
Acquisitions	0	10
Dispositions	(174)
Impairments		0
Settlements and adjustments	(4)	0
Goodwill ending balance	$ 9	$ 187

Goodwill and Other Intangible Assets (Other Intangible Assets) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) numberofyears	Dec. 31, 2010 USD ($)
Finite-lived intangible assets, accumulated amortization	$ (6,665)	$ (8,840)
Total	24,830	12,271
Trade Names [Member]
Indefinite-lived intangible assets, gross	3,006	53
Federal Communications Commission Licenses [Member]
Indefinite-lived intangible assets, gross	$ 636	0
Customer Relationships [Member]
Finite-Lived Intangible Assets, Useful Life, Minimum \| numberofyears	4
Finite-Lived Intangible Assets, Useful Life, Maximum \| numberofyears	20
Finite-lived intangible assets, gross	$ 15,079	6,968
Finite-lived intangible assets, accumulated amortization	$ (3,387)	(5,548)
Cable franchise renewal costs and contractual operating rights [Member]
Finite-Lived Intangible Assets, Useful Life, Minimum \| numberofyears	5
Finite-Lived Intangible Assets, Useful Life, Maximum \| numberofyears	15
Finite-lived intangible assets, gross	$ 1,152	1,077
Finite-lived intangible assets, accumulated amortization	$ (581)	(608)
Software [Member]
Finite-Lived Intangible Assets, Useful Life, Minimum \| numberofyears	3
Finite-Lived Intangible Assets, Useful Life, Maximum \| numberofyears	5
Finite-lived intangible assets, gross	$ 3,234	2,594
Finite-lived intangible assets, accumulated amortization	$ (1,839)	(1,624)
Patents and other technology rights [Member]
Finite-Lived Intangible Assets, Useful Life, Minimum \| numberofyears	3
Finite-Lived Intangible Assets, Useful Life, Maximum \| numberofyears	12
Finite-lived intangible assets, gross	$ 344	307
Finite-lived intangible assets, accumulated amortization	$ (256)	(207)
Other agreements and rights [Member]
Finite-Lived Intangible Assets, Useful Life, Minimum \| numberofyears	3
Finite-Lived Intangible Assets, Useful Life, Maximum \| numberofyears	36
Finite-lived intangible assets, gross	$ 1,379	1,272
Finite-lived intangible assets, accumulated amortization	$ (602)	$ (853)

Goodwill and Other Intangible Assets (Amortization of Intangible Assets) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Future amortization expense, 2012	$ 1,512
Future amortization expense, 2013	1,315
Future amortization expense, 2014	1,134
Future amortization expense, 2015	997
Future amortization expense, 2016	$ 805

Long-Term Debt (Details) £ in Millions, $ in Millions	3 Months Ended	12 Months Ended
Long-Term Debt (Details) £ in Millions, $ in Millions	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 GBP (£)	Dec. 31, 2010 GBP (£)
Line of Credit Facility, Interest Rate Description		The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on Comcast’s credit rating.
Principal amount	$ 1,100
Total debt		$ 39,309	$ 31,415
Less: current portion		1,367	1,800
Long-term debt, less current portion		$ 37,942	29,615
Debt weighted average		5.89%			5.89%
Debt, estimated fair value		$ 45,100	34,300
Accrued interest		612	524
Maturity date	2055
Debt Repayments and Repurchases	$ 563	$ 3,216	1,153	$ 4,738
Interest rate	7.00%
NBCUniversal [Member]
Line of Credit Facility, Interest Rate Description		The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on NBCUniversal’s credit rating.
Principal amount		$ 9,100
Universal Orlando [Member]
Principal amount		1,500
Total debt		418
Senior notes with maturities of 5 years or less [Member]
Senior notes		$ 11,347	8,145
Debt weighted average		5.829%			5.829%
Senior notes with maturities between 6 and 10 years [Member]
Senior notes		$ 10,689	8,381
Debt weighted average		5.512%			5.512%
Senior notes with maturities greater than 10 years [Member]
Senior notes		$ 16,115	14,258
Debt weighted average		6.78%			6.78%
Commercial Paper [Member]
Revolving credit facilities		$ 550
Debt weighted average		0.508%			0.508%
Other, including capital lease obligations [Member]
Other, including capital lease obligations		$ 608	631
Notes 5.50% Due 2029 [Member]
Principal amount \| £					£ 625	£ 625
Senior notes		$ 969	$ 976
Debt weighted average		5.50%	5.50%		5.50%	5.50%
Maturity date		2029	2029
8.875% Senior Notes Due 2015 [Member] \| Universal Orlando [Member]
Maturity date		2015
Debt Repayments and Repurchases		$ 140
Interest rate		8.875%			8.875%
10.875% Senior Subordinated Notes Due 2016 [Member] \| Universal Orlando [Member]
Maturity date		2016
Debt Repayments and Repurchases		$ 79
Interest rate		10.875%			10.875%
Minimum [Member] \| NBCUniversal [Member]
Maturity date		2014
Maximum [Member] \| NBCUniversal [Member]
Maturity date		2041
Universal Orlando Term Loan [Member]
Debt Repayments and Repurchases		$ 801

Long-Term Debt (Debt Maturities) (Details) $ in Millions	Dec. 31, 2011 USD ($)
2012	$ 1,367
2013	2,411
2014	1,992
2015	3,660
2016	2,951
Thereafter	$ 26,928

Long-Term Debt (Debt Borrowings) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Proceeds from borrowings		$ 0	$ 3,420	$ 1,564
Interest rate	7.00%
Debt Instrument, Maturity Date, Description	2055
Principal amount	$ 1,100

Long-Term Debt (Debt Repayments and Repurchases) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt Repayments and Repurchases	$ 563	$ 3,216	$ 1,153	$ 4,738
Interest rate	7.00%
Notes 6.75% due 2011 [Member]
Debt Repayments and Repurchases		$ 1,000
Interest rate		6.75%
Notes 5.5% due 2011 [Member]
Debt Repayments and Repurchases		$ 750
Interest rate		5.50%
Universal Orlando Term Loan [Member]
Debt Repayments and Repurchases		$ 801
Notes 7.00% due 2055 [Member]
Debt Repayments and Repurchases		$ 345
Interest rate		7.00%
10.875% Senior Subordinated Notes Due 2016 [Member] \| Universal Orlando [Member]
Debt Repayments and Repurchases		$ 79
Interest rate		10.875%
8.875% Senior Notes Due 2015 [Member] \| Universal Orlando [Member]
Debt Repayments and Repurchases		$ 140
Interest rate		8.875%
Other Long-Term Debt [Member]
Debt Repayments and Repurchases		$ 101

Long-Term Debt (Commercial Paper Program) (Details) $ in Millions	Dec. 31, 2011 USD ($)
Commercial paper	$ 2,250
NBCUniversal [Member]
Commercial paper	1,500
Commercial paper issued, net of repayments	$ 550

Long-Term Debt (Revolving Bank Credit Facilities) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Revolving bank credit facility	$ 6,800
Base rate, option on credit facility	The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on Comcast’s credit rating.
Basis spread on variable rate	0.35%
NBCUniversal [Member]
Revolving bank credit facility	$ 1,500
Base rate, option on credit facility	The interest rate on this facility consists of a base rate plus a borrowing margin that is determined based on NBCUniversal’s credit rating.
Basis spread on variable rate	1.125%
Revolving bank credit facility [Member]
Unused lines of credit	$ 6,500
Revolving bank credit facility [Member] \| NBCUniversal [Member]
Unused lines of credit	934
Line of Credit [Member]
Unused lines of credit	$ 552

Derivative Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Fair values of our prepaid forward sale agreements	$ 1,234	$ 1,029
Designated Prepaid Forward Sale Agreements [Member]
Derivative [Line Items]
Fair values of our prepaid forward sale agreements	4	29
Nondesignated [Member]
Derivative [Line Items]
Derivative, Notional Amount	719
Interest Rate Swap [Member]
Derivative [Line Items]
Accrued Swap Interest	34	41
Derivative, Notional Amount	$ 4,500	$ 5,300

Terms of Outstanding Fixed to Variable Swaps (Details) - Interest Rate Swap [Member] - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Derivative, remaining maturity low range	2012	2011
Derivative, remaining maturity high range	2018	2018
Derivative, notional amount	$ 4,500	$ 5,300
Derivative, average pay rate	4.10%	4.80%
Derivative, average receive rate	6.20%	6.60%
Interest rate swap, estimated fair value	$ 280	$ 273

Derivative Financial Instruments (Amount of Gain (Loss) Recognized in Income - Fair Value Hedges) Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Gain (loss) on fair value hedging relationships	$ (16)	$ 25
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Change in unrealized gain (loss) on fair value hedging instruments	15	90
Interest Rate Swap Agreements, Long-Term Debt Portion [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(15)	(90)
Prepaid Forward Sale Agreements Securities [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(48)	74
Prepaid Forward Sale Agreement Derivative [Member]
Derivative [Line Items]
Change in unrealized gain (loss) on fair value hedging instruments	$ 32	$ (49)

Derivative Financial Instruments (Pretax Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income - Cash Flow Hedges) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Deferred gain (loss) recognized, total	$ (40)	$ (127)
Deferred (gain) loss reclassified to income, total	31	55
Total change in accumulated other comprehensive income	(9)	(72)
Foreign Exchange Risk [Member]
Derivative [Line Items]
Deferred gain (loss) recognized, foreign exchange risk	(40)	(29)
Deferred (gain) loss reclassified to income, foreign exchange risk	8	21
Total change in accumulated other comprehensive income	(32)	(8)
Interest Rate Risk [Member]
Derivative [Line Items]
Deferred gain (loss) recognized, interest rate risk	0	(98)
Deferred (gain) loss reclassified to income, interest rate risk	23	34
Total change in accumulated other comprehensive income	$ 23	(64)
Loss related to a forecasted debt issuance		$ 18

Derivative Financial Instruments (Amount of Gain (Loss) Recognized in Income - Nondesignated) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Nondesignated Prepaid Forward Sale Agreements [Member]
Derivative [Line Items]
Mark to market adjustments on derivative	$ (151)	$ (616)
Interest Rate Collar [Member]
Derivative [Line Items]
Mark to market adjustments on derivative	0	15
Nondesignated [Member]
Derivative [Line Items]
Total gain (loss)	(154)	(601)
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Mark to market adjustments on derivative	$ (3)	$ 0

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References + Details

Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Jan. 28, 2011
Trading securities	$ 2,895	$ 2,688
Available-for-sale securities	131	126
Equity warrants	2	1
Interest rate swap agreements	246	232
Fair value, assets measured on recurring basis, total	3,284	3,047
Derivative component of prepaid forward sale agreements and indexed debt instruments	1,234	1,029
Contingent consideration	583	0	$ 590
Contractual obligations	1,004	0
Fair value liabilities measured on recurring basis	2,898	1,058
Goodwill impairment charges		76
Fair Value, Inputs, Level 1 [Member]
Trading securities	2,895	2,688
Available-for-sale securities	90	126
Equity warrants	0	0
Interest rate swap agreements	0	0
Fair value, assets measured on recurring basis, total	2,985	2,814
Derivative component of prepaid forward sale agreements and indexed debt instruments	0	0
Contingent consideration	0	0
Contractual obligations	0	0
Fair value liabilities measured on recurring basis	0	0
Fair Value, Inputs, Level 2 [Member]
Trading securities	0	0
Available-for-sale securities	20	0
Equity warrants	0	0
Interest rate swap agreements	246	232
Fair value, assets measured on recurring basis, total	276	232
Derivative component of prepaid forward sale agreements and indexed debt instruments	1,234	1,029
Contingent consideration	0	0
Contractual obligations	0	0
Fair value liabilities measured on recurring basis	1,311	1,058
Fair Value, Inputs, Level 3 [Member]
Trading securities	0	0
Available-for-sale securities	21	0
Equity warrants	2	1
Interest rate swap agreements	0	0
Fair value, assets measured on recurring basis, total	23	1
Derivative component of prepaid forward sale agreements and indexed debt instruments	0	0
Contingent consideration	583	0
Contractual obligations	1,004	0
Fair value liabilities measured on recurring basis	1,587	0
Cross Currency Swap Agreements [Member]
Foreign currency contracts	69	29
Cross Currency Swap Agreements [Member] \| Fair Value, Inputs, Level 1 [Member]
Foreign currency contracts	0	0
Cross Currency Swap Agreements [Member] \| Fair Value, Inputs, Level 2 [Member]
Foreign currency contracts	69	29
Cross Currency Swap Agreements [Member] \| Fair Value, Inputs, Level 3 [Member]
Foreign currency contracts	0	0
Foreign Exchange Contracts [Member]
Foreign exchange contracts	10	0
Foreign currency contracts	8	0
Foreign Exchange Contracts [Member] \| Fair Value, Inputs, Level 1 [Member]
Foreign exchange contracts	0	0
Foreign currency contracts	0	0
Foreign Exchange Contracts [Member] \| Fair Value, Inputs, Level 2 [Member]
Foreign exchange contracts	10	0
Foreign currency contracts	8	0
Foreign Exchange Contracts [Member] \| Fair Value, Inputs, Level 3 [Member]
Foreign exchange contracts	0	0
Foreign currency contracts	0	$ 0
Film Production [Member]
Impairment charges	$ 57

Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
Noncontrolling Interests (Details) - USD ($) $ in Millions	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Additional paid-in capital as a result of the NBCUniversal transaction	$ 1,700								$ 1,700
Net income attributable to Comcast Corporation	$ 1,287	$ 908	$ 1,022	$ 943	$ 1,018	$ 867	$ 884	$ 866	4,160	$ 3,635	$ 3,638
Increase in Comcast Corporation additional paid-in capital resulting from the issuance of noncontrolling equity interest									1,650	0
Increase in Comcast Corporation additional paid-in capital resulting from the purchase of noncontrolling interest									0	11
Changes in equity resulting from net income attributable to Comcast Corporation and transfers from (to) noncontrolling interests									$ 5,810	$ 3,646
GE [Member]
GE ownership percentage in new company formed in connection with the NBC Universal transaction	49.00%								49.00%

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Postretirement, Pension and Other Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
NBCUniversal [Member]
Multiemployer plan contributions	$ 42
Pension Benefits [Member] \| NBCUniversal [Member]
Expected to fund	100
Deferred Compensation Plans [Member]
Cash surrender value of life insurance policies	409	$ 373
Retirement Investment Plans [Member]
Expenses related to retirement investment plans	226	152	$ 182
Employee Severance [Member]
Severance costs	$ 128	$ 67	$ 81

Postretirement, Pension and Other Employee Benefit Plans (Condensed Information On Our Postretirement and Pension Benefit Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	$ 424	$ 360	$ 338
Projected benefit obligation, close of the NBCUniversal transaction	154	0
Service cost	19	31	27
Interest cost	30	21	20
Actuarial (gain) loss	(1)	16	(20)
Benefits paid	(8)	(4)	(5)
Projected benefit obligation, end of the year	618	424	360
Accumulated benefit obligation	618	424	360
Plan funded status and recorded benefit obligation	(618)	(424)	(360)
Portion of benefit obligation not yet recognized in benefits expense	$ (17)	$ (18)	$ (36)
Discount rate	4.75%	5.50%	6.05%
Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation, beginning of the year	$ 0
Projected benefit obligation, close of the NBCUniversal transaction	249	$ 0
Service cost	99
Interest cost	12
Actuarial (gain) loss	71
Benefits paid	(4)
Projected benefit obligation, end of the year	427	$ 0
Accumulated benefit obligation	395
Plan funded status and recorded benefit obligation	(427)
Portion of benefit obligation not yet recognized in benefits expense	$ 71
Discount rate	5.25%
Pension Benefits [Member] \| Minimum [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Discount rate	4.75%

Postretirement, Pension and Other Employee Benefit Plans (Components of Benefits Expense)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 31	$ 27
Interest cost	30	21	20
Amortization	(2)	(2)	(2)
Total benefits expense	47	$ 50	$ 45
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	99
Interest cost	12
Amortization	0
Total benefits expense	$ 111

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References + Details

- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

+ Details

- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

+ References + Details

Postretirement, Pension and Other Employee Benefit Plans (Expected Future Benefit Payments)(Details) $ in Millions	Dec. 31, 2011 USD ($)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	$ 14
2013	16
2014	19
2015	21
2016	23
2017 - 2021	148
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2012	9
2013	11
2014	13
2015	16
2016	19
2017 - 2021	$ 183

Postretirement, Pension and Other Employee Benefit Plans (Condensed Information On Our Frozen Pension Benefit Plans) (Details) - Defined Benefit Frozen Pension [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Benefit obligation	$ 211	$ 197	$ 184
Fair value of plan assets	176	183	176
Plan funded status and recorded benefit obligation	(35)	(14)	(8)
Portion of benefit obligation not yet recognized in benefits expense	66	51	46
Benefit expenses	$ 6	$ 1	$ 2
Discount rate	4.75%	5.25%	5.75%
Expected return on plan assets	6.50%	8.00%	8.00%

- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

+ Details

- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References + Details

- Definition

The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 11
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

Postretirement, Pension and Other Employee Benefit Plans (Deferred Compensation Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Benefit obligation	$ 1,059	$ 935	$ 849
Interest expense	$ 99	$ 88	$ 79

Postretirement, Pension and Other Employee Benefit Plans (Benefit Obligation and Expense for Our Split-Dollar Life Insurance Agreements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Benefit obligation	$ 169	$ 164	$ 166
Expense	$ 27	$ 16	$ 37

Equity (Narrative) (Details) $ in Billions	1 Months Ended	3 Months Ended	12 Months Ended
Equity (Narrative) (Details) $ in Billions	Feb. 29, 2012 USD ($) $ / shares	Mar. 31, 2012 $ / shares	Dec. 31, 2011	Dec. 31, 2007 USD ($)
Number of votes entitled of each class B common stock			15
Share repurchase authorization \| $	$ 6.5			$ 7.0
Dividends per share declared after the reporting period		0.1625
Increase to planned annual dividend	44.00%
Per share annual planned dividend	$ 0.65
Class A Common Stock [Member]
Voting power			66.67%
Class B Common Stock [Member]
Voting power			33.33%

Equity (Aggregate Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Equity
Aggregate consideration	$ 2,141	$ 1,200	$ 765
Shares repurchased	95	70	50

Equity (Changes in Common Stock) (Details) - shares	12 Months Ended
Equity (Changes in Common Stock) (Details) - shares	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Repurchase and retirement of common stock	95,000,000	70,000,000	50,000,000
Class A Common Stock [Member]
Common Stock, Shares, Outstanding, Beginning Balance	2,071,820,901	2,063,000,000	2,061,000,000
Stock compensation plans	20,000,000	6,000,000	3,000,000
Repurchase and retirement of common stock	0	0	(5,000,000)
Employee stock purchase plan	3,000,000	3,000,000	4,000,000
Common Stock, Shares, Outstanding, Ending Balance	2,095,476,503	2,071,820,901	2,063,000,000
Class A Special Common Stock [Member]
Common Stock, Shares, Outstanding, Beginning Balance	695,233,894	765,000,000	810,000,000
Stock compensation plans	1,000,000	0	0
Repurchase and retirement of common stock	(95,000,000)	(70,000,000)	(45,000,000)
Employee stock purchase plan	0	0	0
Common Stock, Shares, Outstanding, Ending Balance	601,012,813	695,233,894	765,000,000
Class B Common Stock [Member]
Common Stock, Shares, Outstanding, Beginning Balance	9,444,375	9,000,000	9,000,000
Stock compensation plans	0	0	0
Repurchase and retirement of common stock	0	0	0
Employee stock purchase plan	0	0	0
Common Stock, Shares, Outstanding, Ending Balance	9,444,375	9,444,375	9,000,000

- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

+ References + Details

- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividend per share	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.45	$ 0.378	$ 0.297
Amount									$ 1,233	$ 1,059	$ 850
January [Member]
Dividend per share									$ 0.1125
Amount									$ 312
February [Member]
Dividend per share										$ 0.0945
Amount										$ 267
May [Member]
Dividend per share									$ 0.1125	$ 0.0945
Amount									$ 309	$ 265
July [Member]
Dividend per share									$ 0.1125	$ 0.0945
Amount									$ 307	$ 264
October [Member]
Dividend per share									$ 0.1125	$ 0.0945
Amount									$ 305	$ 263

Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Equity
Unrealized gains (losses) on marketable securities	$ 22	$ 26
Deferred gains (losses) on cash flow hedges	(110)	(105)
Unrecognized gains (losses) on employee benefit obligations	(58)	(19)
Cumulative translation adjustments	(6)	(1)
Accumulated other comprehensive income (loss), net of deferred taxes	$ (152)	$ (99)

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e681-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Share-Based Compensation (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) $ / shares numberofyears shares	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)
Excess cash income tax benefit \| $	$ 46	$ 4	$ 0
Stock Options [Member]
Unrecognized pretax compensation expense on nonvested awards \| $	$ 317
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years) \| numberofyears	2.0
Restricted Share Units [Member]
Unrecognized pretax compensation expense on nonvested awards \| $	$ 327
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years) \| numberofyears	1.8
Employee Stock Purchase Plan [Member]
Share-based compensation arrangement by share-based payment award, discount from market price	15.00%
Cash received from exercise of stock options \| $	$ 58	$ 50	$ 48
Option Plans [Member]
Share-based compensation arrangement by share-based payment award, award expiration year	10
Common stock, capital shares reserved for future issuance	241,000,000
Share-based compensation arrangement by share-based payment award, award vesting period in years	5
Restricted Stock Plan [Member]
Share-based compensation arrangement by share-based payment award, award requisite service period, maximum (in years) \| numberofyears	5
Share-based payment award, number of shares authorized	69,000,000
Stock Option Liquidity Program [Member]
Stock option liquidity program expiration year	2012
Stock options outstanding	1,500,000
Weighted-average exercise price of the options outstanding \| $ / shares	16.55
Cash received from exercise of stock options \| $	$ 60
Class A Common Stock [Member] \| Restricted Stock Plan [Member]
Share-based compensation arrangement by share-based payment award, options, outstanding, number	1,600,000
Class A Special Common Stock [Member] \| Deferred Stock Option Plan [Member]
Share-based compensation arrangement by share-based payment award, options, outstanding, number	1,900,000
Class A Special Common Stock [Member] \| Restricted Stock Plan [Member]
Share-based compensation arrangement by share-based payment award, options, outstanding, number	34,000

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allocated share-based compensation expense	$ 278	$ 251	$ 209
Tax benefit	98	89	73
Stock Options [Member]
Allocated share-based compensation expense	116	103	103
Restricted Share Units [Member]
Allocated share-based compensation expense	149	136	93
Employee Stock Purchase Plan [Member]
Allocated share-based compensation expense	$ 13	$ 12	$ 13

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References + Details

Share-Based Compensation (Stock Option Fair Value) (Details)	12 Months Ended
	Dec. 31, 2011 numberofyears $ / shares	Dec. 31, 2010 numberofyears $ / shares	Dec. 31, 2009 numberofyears $ / shares
Fair value \| $ / shares	$ 6.96	$ 5.11	$ 4.93
Dividend yield	1.80%	2.10%	1.90%
Expected volatility	28.10%	28.00%	36.80%
Risk-free interest rate	2.80%	3.40%	2.40%
Expected option life (in years) \| numberofyears	7.0	7.0	7.0

Share-Based Compensation (Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2011 numberofyears $ / shares shares	Dec. 31, 2011 USD ($) numberofyears $ / shares shares
Class A Common Stock [Member]
Weighted-average exercise price, as of December 31, 2011	$ 18.74	$ 19.71
Weighted-average exercise price		$ 19.55
Weighted-average remaining contractual term \| numberofyears	4.0
Aggregate intrinsic value (in millions) \| $		$ 258
Weighted average exercise price, Outstanding as of January 1, 2011	$ 18.74
Weighted average exercise price, Granted		$ 24.98
Weighted average exercise price, Exercised		18.99
Weighted average exercise price, Forfeited		19.19
Weighted average exercise price, Expired		$ 22.47
Weighted average exercise price, Outstanding as of December 31, 2011	19.71
Aggregate intrinsic value (in millions) \| $		$ 630
Weighted-average remaining contractual term \| numberofyears		6.2
Class A Special Common Stock [Member]
Weighted-average exercise price, as of December 31, 2011	$ 22.82	$ 21.92
Weighted-average exercise price		$ 21.84
Weighted-average remaining contractual term \| numberofyears	0.2
Aggregate intrinsic value (in millions) \| $		$ 16
Weighted average exercise price, Outstanding as of January 1, 2011	$ 22.82
Weighted average exercise price, Exercised		$ 19.93
Weighted average exercise price, Forfeited		14.27
Weighted average exercise price, Expired		$ 24.93
Weighted average exercise price, Outstanding as of December 31, 2011	$ 21.92
Aggregate intrinsic value (in millions) \| $		$ 17
Weighted-average remaining contractual term \| numberofyears		0.2
Cash Settled Options [Member] \| Class A Common Stock [Member]
Outstanding as of January 1, 2011 \| shares	27,037
Granted \| shares	0
Exercised \| shares	(10,472)
Forfeited \| shares	(21)
Expired \| shares	(2,987)
Outstanding as of December 31,2011 \| shares	13,557
Weighted-average exercise price, as of December 31, 2011	$ 19.30	$ 19.30
Exercisable as of December 31, 2011 \| shares		13,160
Weighted-average exercise price		$ 19.27
Weighted-average remaining contractual term \| numberofyears	2.4
Aggregate intrinsic value (in millions) \| $		$ 60
Weighted average exercise price, Outstanding as of December 31, 2011	$ 19.30
Aggregate intrinsic value (in millions) \| $		$ 62
Cash Settled Options [Member] \| Class A Special Common Stock [Member]
Outstanding as of January 1, 2011 \| shares	6,557
Exercised \| shares	(833)
Forfeited \| shares	(2)
Expired \| shares	(2,539)
Outstanding as of December 31,2011 \| shares	3,183
Weighted-average exercise price, as of December 31, 2011	$ 20.61	$ 20.61
Exercisable as of December 31, 2011 \| shares		3,146
Weighted-average exercise price		$ 20.66
Weighted-average remaining contractual term \| numberofyears	0.2
Aggregate intrinsic value (in millions) \| $		$ 9
Weighted average exercise price, Outstanding as of December 31, 2011	$ 20.61
Aggregate intrinsic value (in millions) \| $		$ 10
Net Settled Options [Member] \| Class A Common Stock [Member]
Outstanding as of January 1, 2011 \| shares	125,358
Granted \| shares	25,700
Exercised \| shares	(15,081)
Forfeited \| shares	(5,773)
Expired \| shares	(25)
Outstanding as of December 31,2011 \| shares	130,179
Weighted-average exercise price, as of December 31, 2011	$ 19.75	$ 19.75
Exercisable as of December 31, 2011 \| shares		44,638
Weighted-average exercise price		$ 19.63
Weighted-average remaining contractual term \| numberofyears	4.5
Aggregate intrinsic value (in millions) \| $		$ 198
Weighted average exercise price, Outstanding as of December 31, 2011	$ 19.75
Aggregate intrinsic value (in millions) \| $		$ 568
Net Settled Options [Member] \| Class A Special Common Stock [Member]
Outstanding as of January 1, 2011 \| shares	13,963
Exercised \| shares	(1,905)
Forfeited \| shares	0
Expired \| shares	(5,396)
Outstanding as of December 31,2011 \| shares	6,662
Weighted-average exercise price, as of December 31, 2011	$ 22.55	$ 22.55
Exercisable as of December 31, 2011 \| shares		5,852
Weighted-average exercise price		$ 22.47
Weighted-average remaining contractual term \| numberofyears	0.2
Aggregate intrinsic value (in millions) \| $		$ 7
Weighted average exercise price, Outstanding as of December 31, 2011	$ 22.55
Aggregate intrinsic value (in millions) \| $		$ 7

Share-Based Compensation (Exercised Stock Options) (Details) - Exercised Stock Options [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intrinsic value of options exercised	$ 156	$ 8	$ 0
Tax benefit of options exercised	58	3	0
Cash received from options exercised	$ 223	$ 34	$ 1

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3255-108585

+ Details

Share-Based Compensation (Weighted-Average Fair Value of Grants) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 22.78	$ 16.94	$ 13.60
Restricted Stock Plan [Member]
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 22.78

Share-Based Compensation (Restricted Stock Plan Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted average grant date fair value, Granted	$ 22.78	$ 16.94	$ 13.60
Nonvested Restricted Share Unit Awards [Member]
Nonvested awards outstanding as of January 1, 2011	29,551
Granted	10,847
Vested	(8,058)
Forfeited	(2,455)
Nonvested awards outstanding as of December 31, 2011	29,885	29,551
Restricted Stock Plan [Member]
Nonvested awards outstanding as of January 1, 2011	$ 16.94
Weighted average grant date fair value, Granted	22.78
Weighted average grant date fair value, Vested	18.16
Weighted average grant date fair value, Forfeited	17.83
Nonvested awards outstanding as of December 31, 2011	$ 18.65	$ 16.94

Share-Based Compensation (Vested Restricted Share Units) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Intrinsic value of RSUs vested	$ 197	$ 99	$ 61
Tax benefit of RSUs vested	$ 69	$ 36	$ 22

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Undistributed foreign earnings	$ 85
Deferred tax assets, operating loss carryforwards, domestic	166
Liability for uncertain tax positions, noncurrent	1,400
Unrecognized tax benefits that would impact effective tax rate	1,100
Unrecognized tax benefits, interest on income taxes accrued	698	$ 604
Franchise Rights [Member]
Net deferred tax liability, franchise rights	23,000
NBCUniversal [Member]
Foreign income before taxes	476
Deferred tax assets, operating loss carryforwards, foreign	271
Liability for uncertain tax positions, noncurrent	50
Unrecognized tax benefits, interest on income taxes accrued	10
Other Comprehensive Income (Loss) [Member]
Income tax effects allocated directly to equity, other	32
Additional Paid-In Capital [Member]
Income tax effects allocated directly to equity, other	611
Share-Based Compensation [Member]
Income tax effects allocated directly to equity, other	$ (38)	$ (3)	$ 14

Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal	$ 1,480	$ 1,502	$ 802
State	359	385	(156)
Foreign	153	0	0
Current income tax expense (benefit)	1,992	1,887	646
Federal	658	463	945
State	371	86	(113)
Foreign	29	0	0
Deferred income tax expense (benefit)	1,058	549	832
Income tax expense	$ 3,050	$ 2,436	$ 1,478

Income Taxes (Federal Statutory) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Federal tax at statutory rate	$ 2,872	$ 2,136	$ 1,787
State income taxes, net of federal benefit	354	204	174
Foreign income taxes, net of federal credit	89	0	0
Nontaxable income attributable to noncontrolling interests	(410)	2	0
Benefit related to certain subsidiary reorganizations	0	0	(151)
Income tax expense	3,050	2,436	1,478
Uncertain and effectively settled tax positions, net
Other adjustments	77	37	(178)
Accrued interest on uncertain and effectively settled tax positions, net [Member]
Other adjustments	66	60	(120)
Other [Member]
Other adjustments	$ 2	$ (3)	$ (34)

Income Taxes (Components of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Net operating loss carryforwards	$ 468	$ 343
Nondeductible accruals and other	1,583	1,301
Less: Valuation allowance	297	207
Total deferred tax assets	1,868	1,560
Total deferred tax liabilities	31,575	29,632
Net deferred tax liability	29,707	28,072
NBCUniversal [Member]
Deferred tax liabilities, other	1,214	0
Debt [Member]
Differences between book and tax basis of long-term debt	114	123
Property And Equipment And Intangible Assets [Member]
Deferred tax liabilities, other	29,185	28,468
Investments [Member]
Deferred tax liabilities, other	616	627
Indexed Debt Securities [Member]
Deferred tax liabilities, other	$ 560	$ 537

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Beginning balance	$ 1,251	$ 1,185	$ 1,450
Additions based on tax positions related to the current year	87	69	57
Additions based on tax positions related to prior years	75	59	0
Additions from acquired subsidiaries	57	0	0
Reductions for tax positions of prior years	(22)	(28)	(257)
Reductions due to expiration of statute of limitations	(5)	(24)	0
Settlements with taxing authorities	(8)	(10)	(65)
Ending balance	$ 1,435	$ 1,251	$ 1,185

Supplemental Financial Information (Narrative)(Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Ownership percentage	51.00%
Dividends payable, amount	$ 305	$ 263	$ 268
Dividends payable, amount per share	$ 0.1125	$ 0.0945	$ 0.0945
Capital expenditures incurred but not yet paid	$ 1,000	$ 611	$ 389
GE [Member]
GE ownership percentage in new company formed in connection with the NBC Universal transaction	49.00%
Universal Orlando [Member]
Remaining equity interest acquired	50.00%

Supplemental Financial Information (Receivables)(Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010
Supplemental Financial Information [Abstract]
Receivables, gross	$ 4,978	$ 2,028
Less: Allowance for returns and customer incentives	425	0
Less: Allowance for doubtful accounts	202	173
Receivables, net	$ 4,351	$ 1,855

Supplemental Financial Information (Operating Costs and Expenses (Excluding Depreciation and Amortization))(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Financial Information [Abstract]
Programming and production	$ 16,623	$ 8,555	$ 7,846
Cable Communications technical labor	2,280	2,263	2,295
Cable Communications customer service	1,855	1,833	1,881
Advertising, marketing and promotion	4,240	2,415	2,056
Other	12,487	8,275	7,964
Operating costs and expenses (excluding depreciation and amortization)	$ 37,485	$ 23,341	$ 22,042

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental Financial Information [Abstract]
Interest	$ 2,441	$ 1,983	$ 2,040
Income taxes	$ 1,626	$ 1,864	$ 1,303

Receivables Monetization (Narrative)(Details) $ in Millions	Dec. 31, 2011 USD ($)
Receivables Monetization [Abstract]
Securitization programs payable	$ 781

Receivables Monetization (Effect on Income From Receivables Monetization and Cash Flows on Transfers)(Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Receivables Monetization [Abstract]
Net (loss) gain on sale	$ (36)
Net cash proceeds (payments) on transfers	$ (237)

Receivables Monetization (Receivables Monetized and Deferred Consideration)(Details) $ in Millions	Dec. 31, 2011 USD ($)
Receivables Monetization [Abstract]
Monetized receivables sold	$ 961
Deferred consideration	$ 268

Commitments and Contingencies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($) numberofemployees	Dec. 31, 2010 USD ($)
Contractual obligations	$ 1,004	$ 0
Collateral liability for unconsolidated subsidiary debt	$ 482
NBCUniversal [Member]
Number of employees covered under collective bargaining agreements \| numberofemployees	4,000
Percentage of employees covered under collective bargaining agreements that have expired or are scheduled to expire during 2012	46.00%
Contractual obligations	$ 1,000
Fair value adjustments	$ 57
Equity interest in Station Venture Holdings	79.62%
Voting interest in Station Venture Holdings	50.00%
Station Venture Senior Secured Note Due In 2023 [Member]
Debt of unconsolidated variable interest entity	$ 816
Maturity year	2023

Commitments and Contingencies (Minimum Annual Commitments under the Programming License Agreements) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2011 USD ($)
Programming and talent commitments future minimum payments, 2012	$ 4,793
Programming and talent commitments future minimum payments, 2013	2,388
Programming and talent commitments future minimum payments, 2014	2,887
Programming and talent commitments future minimum payments, 2015	1,976
Programming and talent commitments future minimum payments, 2016	3,104
Programming and talent commitments future minimum payments, thereafter	17,301
Operating leases future minimum payments, 2012	548
Operating leases future minimum payments, 2013	448
Operating leases future minimum payments, 2014	388
Operating leases future minimum payments, 2015	333
Operating leases future minimum payments, 2016	320
Operating leases future minimum payments, thereafter	$ 1,410

Commitments and Contingencies (Rental expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Rental expense	$ 570	$ 424	$ 418

Financial Data by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue	$ 15,042	$ 14,339	$ 14,333	$ 12,128	$ 9,721	$ 9,489	$ 9,525	$ 9,202	$ 55,842	$ 37,937	$ 35,756
Operating income (loss) before depreciation and amortization									18,357	14,596	13,714
Depreciation and amortization									7,636	6,616	6,500
Operating income (loss)	2,918	$ 2,641	$ 2,938	$ 2,224	2,013	$ 1,954	$ 2,078	$ 1,935	10,721	7,980	7,214
Capital expenditures									5,307	4,961	$ 5,117
Assets	157,818				$ 118,534				157,818	$ 118,534
Non US revenue									$ 4,100
Cable segment revenue types as percentage of total cable revenue									100.00%	100.00%	100.00%
Non US property and equipment	60								$ 60
Cable Communications [Member]
Revenue									37,226	$ 35,363	$ 33,544
Operating income (loss) before depreciation and amortization									15,288	14,302	13,459
Depreciation and amortization									6,395	6,232	6,199
Operating income (loss)									8,893	8,070	7,260
Capital expenditures									4,806	4,853	5,031
Assets	120,729								120,729
Cable Networks [Member]
Revenue									8,108	2,719	2,415
Operating income (loss) before depreciation and amortization									3,185	732	606
Depreciation and amortization									718	323	278
Operating income (loss)									2,467	409	328
Capital expenditures									48	51	55
Assets	29,578								29,578
Non US revenue									0
Broadcast Television [Member]
Revenue									5,935
Operating income (loss) before depreciation and amortization									138
Depreciation and amortization									79
Operating income (loss)									59
Capital expenditures									61
Assets	6,213								6,213
Non US revenue									0
Filmed Entertainment [Member]
Revenue									4,239
Operating income (loss) before depreciation and amortization									27
Depreciation and amortization									20
Operating income (loss)									7
Capital expenditures									6
Assets	3,891								3,891
Non US revenue									0
Theme Parks [Member]
Revenue									1,874
Operating income (loss) before depreciation and amortization									830
Depreciation and amortization									146
Operating income (loss)									684
Capital expenditures									154
Assets	6,197								6,197
Non US revenue									0
Headquarters And Other [Member]
Revenue									45
Operating income (loss) before depreciation and amortization									(484)
Depreciation and amortization									168
Operating income (loss)									(652)
Capital expenditures									165
Assets	5,443								5,443
NBCUniversal Eliminations [Member]
Revenue									(941)
Operating income (loss) before depreciation and amortization									(234)
Depreciation and amortization									1
Operating income (loss)									(235)
Capital expenditures									0
Assets	(538)								(538)
NBCUniversal [Member]
Revenue									19,260
Operating income (loss) before depreciation and amortization									3,462
Depreciation and amortization									1,132
Operating income (loss)									2,330
Capital expenditures									434
Assets	50,784								50,784
Corporate and Other [Member]
Revenue									558	168	49
Operating income (loss) before depreciation and amortization									(416)	(438)	(351)
Depreciation and amortization									93	61	23
Operating income (loss)									(509)	(499)	(374)
Capital expenditures									67	57	31
Assets	6,224								6,224
Eliminations [Member]
Revenue									(1,202)	(313)	(252)
Operating income (loss) before depreciation and amortization									23	0	0
Depreciation and amortization									16	0	0
Operating income (loss)									7	0	0
Capital expenditures									0	$ 0	$ 0
Assets	$ (19,919)								$ (19,919)
Cable Communications Segment Revenue Percentage-Video [Member]
Cable segment revenue types as percentage of total cable revenue									52.70%	54.80%	57.50%
Cable Communications Segment Revenue Percentage - High-speed Internet [Member]
Cable segment revenue types as percentage of total cable revenue									23.50%	22.50%	21.70%
Cable Communications Segment Revenue Percentage- Phone [Member]
Cable segment revenue types as percentage of total cable revenue									9.40%	9.30%	9.20%
Cable Communications Segment Revenue Percentage- Advertising [Member]
Cable segment revenue types as percentage of total cable revenue									5.40%	5.70%	4.80%
Cable Communications Segment Revenue Percentage- Business Services [Member]
Cable segment revenue types as percentage of total cable revenue									4.80%	3.60%	2.50%
Cable Communications Segment Revenue Percentage- Other [Member]
Cable segment revenue types as percentage of total cable revenue									4.20%	4.10%	4.30%
Cable Communications Segment Revenue Percentage- Franchise fees [Member]
Cable segment revenue types as percentage of total cable revenue									2.80%	2.80%	2.50%

Quarterly Financial Information (Components of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Information
Revenue	$ 15,042	$ 14,339	$ 14,333	$ 12,128	$ 9,721	$ 9,489	$ 9,525	$ 9,202	$ 55,842	$ 37,937	$ 35,756
Operating income	2,918	2,641	2,938	2,224	2,013	1,954	2,078	1,935	10,721	7,980	7,214
Net income attributable to Comcast Corporation	$ 1,287	$ 908	$ 1,022	$ 943	$ 1,018	$ 867	$ 884	$ 866	$ 4,160	$ 3,635	$ 3,638
Basic earnings per common share attributable to Comcast Corporation shareholders	$ 0.47	$ 0.33	$ 0.37	$ 0.34	$ 0.37	$ 0.31	$ 0.31	$ 0.31	$ 1.51	$ 1.29	$ 1.27
Diluted earnings per common share attributable to Comcast Corporation shareholders	0.47	0.33	0.37	0.34	0.36	0.31	0.31	0.31	1.50	1.29	1.26
Dividends declared per common share attributable to Comcast Corporation shareholders	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.1125	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.0945	$ 0.45	$ 0.378	$ 0.297

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

+ Details

- Definition

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Condensed Consolidating Financial Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Holding company ownership in subsidiaries		100.00%
Interest rate	7.00%
Debt Instrument, Maturity Date, Description	2055
2012		$ 1,367
2013		2,411
2014		1,992
2015		3,660
2016		2,951
Thereafter		26,928
Comcast Holdings' ZONES due October 2029 [Member]
Amount of unconditional guarantee of principal amount outstanding of Comcast Holdings		$ 185
Debt Instrument, Maturity Date, Description		2029
Comcast Holdings' 10 5/8% senior subordinated debentures due 2012 [Member]
Current principal balance		$ 202
Interest rate		10.625%
Debt Instrument, Maturity Date, Description		2012
Comcast Holdings' ZONES due November 2029 [Member]
Current principal balance		$ 62
Debt Instrument, Maturity Date, Description		2029
Universal Orlando Senior Notes Due 2015 [Member]
Debt Instrument, Maturity Date, Description		2015
Universal Orlando Senior Notes Due 2016 [Member]
Debt Instrument, Maturity Date, Description		2016
Guarantor Subsidiaries [Member]
2012		$ 580
2013		2,400
2014		1,100
2015		2,300
2016		1,800
Thereafter		$ 20,600

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Cash and cash equivalents	$ 1,620	$ 5,984	$ 671	$ 1,195
Receivables, net	4,351	1,855
Programming rights	987	122
Other current assets	1,615	925
Total current assets	8,573	8,886
Film and television costs	5,227	460
Investments	9,854	6,670
Investments in and amounts due from subsidiaries eliminated upon consolidation	0	0
Property and equipment, net	27,559	23,515
Franchise rights	59,376	59,442
Goodwill	26,874	14,958	14,933
Other intangible assets, net	18,165	3,431
Other noncurrent assets, net	2,190	1,172
Total assets	157,818	118,534
Accounts payable and accrued expenses related to trade creditors	5,705	3,291
Accrued participations and residuals	1,255	0
Accrued expenses and other current liabilities	4,914	3,143
Current portion of long-term debt	1,367	1,800
Total current liabilities	13,241	8,234
Long-term debt, less current portion	37,942	29,615
Deferred income taxes	29,932	28,246
Other noncurrent liabilities	13,034	7,862
Redeemable noncontrolling interests	16,014	143
Common stock	32	32
Other shareholders' equity	47,242	44,322
Total Comcast Corporation shareholders' equity	47,274	44,354
Noncontrolling interests	381	80
Total equity	47,655	44,434	42,811	40,576
Total liabilities and equity	157,818	118,534
Comcast [Member]
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	235	162
Total current assets	235	162
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	71,222	68,987
Property and equipment, net	262	278
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	9	10
Other noncurrent assets, net	912	1,128
Total assets	72,640	70,565
Accounts payable and accrued expenses related to trade creditors	10	6
Accrued participations and residuals	0
Accrued expenses and other current liabilities	1,030	1,038
Current portion of long-term debt	26	755
Total current liabilities	1,066	1,799
Long-term debt, less current portion	22,451	22,754
Deferred income taxes	0	0
Other noncurrent liabilities	1,849	1,658
Redeemable noncontrolling interests	0	0
Common stock	32	32
Other shareholders' equity	47,242	44,322
Total Comcast Corporation shareholders' equity	47,274	44,354
Noncontrolling interests	0	0
Total equity	47,274	44,354
Total liabilities and equity	72,640	70,565
CCCL Parent [Member]
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	8	0
Total current assets	8	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	89,568	90,076
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	30	45
Total assets	89,606	90,121
Accounts payable and accrued expenses related to trade creditors	0	3
Accrued participations and residuals	0
Accrued expenses and other current liabilities	189	187
Current portion of long-term debt	0	1,000
Total current liabilities	189	1,190
Long-term debt, less current portion	3,953	3,963
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Common stock	0	0
Other shareholders' equity	85,464	84,968
Total Comcast Corporation shareholders' equity	85,464	84,968
Noncontrolling interests	0	0
Total equity	85,464	84,968
Total liabilities and equity	89,606	90,121
Combined CCHMO Parents [Member]
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	3	0
Total current assets	3	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	45,725	52,652
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	5	0
Total assets	45,733	52,652
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0
Accrued expenses and other current liabilities	77	74
Current portion of long-term debt	554	0
Total current liabilities	631	74
Long-term debt, less current portion	1,764	2,339
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Common stock	0	0
Other shareholders' equity	43,338	50,239
Total Comcast Corporation shareholders' equity	43,338	50,239
Noncontrolling interests	0	0
Total equity	43,338	50,239
Total liabilities and equity	45,733	52,652
Comcast Holdings [Member]
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	88,336	72,629
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	148	148
Total assets	88,484	72,777
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0
Accrued expenses and other current liabilities	272	266
Current portion of long-term debt	202	0
Total current liabilities	474	266
Long-term debt, less current portion	111	310
Deferred income taxes	727	704
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Common stock	0	0
Other shareholders' equity	87,172	71,497
Total Comcast Corporation shareholders' equity	87,172	71,497
Noncontrolling interests	0	0
Total equity	87,172	71,497
Total liabilities and equity	88,484	72,777
Comcast Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	1,620	5,984	671	1,195
Receivables, net	4,351	1,855
Programming rights	987	122
Other current assets	1,369	763
Total current assets	8,327	8,724
Film and television costs	5,227	460
Investments	9,854	6,670
Investments in and amounts due from subsidiaries eliminated upon consolidation	36,949	12,339
Property and equipment, net	27,297	23,237
Franchise rights	59,376	59,442
Goodwill	26,874	14,958
Other intangible assets, net	18,156	3,421
Other noncurrent assets, net	1,761	670
Total assets	193,821	129,921
Accounts payable and accrued expenses related to trade creditors	5,695	3,282
Accrued participations and residuals	1,255
Accrued expenses and other current liabilities	3,346	1,578
Current portion of long-term debt	585	45
Total current liabilities	10,881	4,905
Long-term debt, less current portion	9,663	249
Deferred income taxes	29,728	28,218
Other noncurrent liabilities	11,328	6,347
Redeemable noncontrolling interests	16,014	143
Common stock	0	0
Other shareholders' equity	115,826	89,979
Total Comcast Corporation shareholders' equity	115,826	89,979
Noncontrolling interests	381	80
Total equity	116,207	90,059
Total liabilities and equity	193,821	129,921
Elimination and Consolidation Adjustments [Member]
Cash and cash equivalents	0	0	$ 0	$ 0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	(331,800)	(296,683)
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	(666)	(819)
Total assets	(332,466)	(297,502)
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0
Accrued expenses and other current liabilities	0	0
Current portion of long-term debt	0	0
Total current liabilities	0	0
Long-term debt, less current portion	0	0
Deferred income taxes	(523)	(676)
Other noncurrent liabilities	(143)	(143)
Redeemable noncontrolling interests	0	0
Common stock	0	0
Other shareholders' equity	(331,800)	(296,683)
Total Comcast Corporation shareholders' equity	(331,800)	(296,683)
Noncontrolling interests	0	0
Total equity	(331,800)	(296,683)
Total liabilities and equity	$ (332,466)	$ (297,502)

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Service revenue									$ 55,842	$ 37,937	$ 35,756
Management fee revenue									0	0	0
Revenue	$ 15,042	$ 14,339	$ 14,333	$ 12,128	$ 9,721	$ 9,489	$ 9,525	$ 9,202	55,842	37,937	35,756
Operating costs and expenses									37,485	23,341	22,042
Depreciation									6,040	5,539	5,483
Amortization									1,596	1,077	1,017
Costs and expenses, total									45,121	29,957	28,542
Operating income (loss)	2,918	2,641	2,938	2,224	2,013	1,954	2,078	1,935	10,721	7,980	7,214
Interest expense									(2,505)	(2,156)	(2,348)
Investment income (loss), net									159	288	282
Equity in net income (losses) of investees, net									(35)	(141)	(64)
Other income (expense), net									(133)	133	22
Nonoperating income (Expense), Total									(2,514)	(1,876)	(2,108)
Income (loss) before income taxes									8,207	6,104	5,106
Income tax (expense) benefit									(3,050)	(2,436)	(1,478)
Net income (loss) from consolidated operations									5,157	3,668	3,628
Net (income) loss attributable to noncontrolling interests									(997)	(33)	10
Net income (loss) attributable to Comcast Corporation	$ 1,287	$ 908	$ 1,022	$ 943	$ 1,018	$ 867	$ 884	$ 866	4,160	3,635	3,638
Comcast [Member]
Service revenue									0	0	0
Management fee revenue									800	808	768
Revenue									800	808	768
Operating costs and expenses									420	444	362
Depreciation									29	29	29
Amortization									3	3	0
Costs and expenses, total									452	476	391
Operating income (loss)									348	332	377
Interest expense									(1,439)	(1,402)	(1,296)
Investment income (loss), net									3	8	3
Equity in net income (losses) of investees, net									4,879	4,329	4,233
Other income (expense), net									(19)	(5)	0
Nonoperating income (Expense), Total									3,424	2,930	2,940
Income (loss) before income taxes									3,772	3,262	3,317
Income tax (expense) benefit									388	373	321
Net income (loss) from consolidated operations									4,160	3,635	3,638
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Comcast Corporation									4,160	3,635	3,638
CCCL Parent [Member]
Service revenue									0	0	0
Management fee revenue									784	726	678
Revenue									784	726	678
Operating costs and expenses									784	726	678
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									784	726	678
Operating income (loss)									0	0	0
Interest expense									(338)	(402)	(666)
Investment income (loss), net									0	0	0
Equity in net income (losses) of investees, net									5,598	4,741	4,913
Other income (expense), net									0	0	0
Nonoperating income (Expense), Total									5,260	4,339	4,247
Income (loss) before income taxes									5,260	4,339	4,247
Income tax (expense) benefit									118	141	233
Net income (loss) from consolidated operations									5,378	4,480	4,480
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Comcast Corporation									5,378	4,480	4,480
Combined CCHMO Parents [Member]
Service revenue									0	0	0
Management fee revenue									488	452	439
Revenue									488	452	439
Operating costs and expenses									488	452	439
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									488	452	439
Operating income (loss)									0	0	0
Interest expense									(172)	(173)	(223)
Investment income (loss), net									0	0	0
Equity in net income (losses) of investees, net									3,361	3,015	3,275
Other income (expense), net									0	0	0
Nonoperating income (Expense), Total									3,189	2,842	3,052
Income (loss) before income taxes									3,189	2,842	3,052
Income tax (expense) benefit									60	61	78
Net income (loss) from consolidated operations									3,249	2,903	3,130
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Comcast Corporation									3,249	2,903	3,130
Comcast Holdings [Member]
Service revenue									0	0	0
Management fee revenue									0	0	0
Revenue									0	0	0
Operating costs and expenses									5	59	57
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									5	59	57
Operating income (loss)									(5)	(59)	(57)
Interest expense									(32)	(33)	(29)
Investment income (loss), net									2	7	8
Equity in net income (losses) of investees, net									5,734	4,675	4,781
Other income (expense), net									1	0	0
Nonoperating income (Expense), Total									5,705	4,649	4,760
Income (loss) before income taxes									5,700	4,590	4,703
Income tax (expense) benefit									12	30	27
Net income (loss) from consolidated operations									5,712	4,620	4,730
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Comcast Corporation									5,712	4,620	4,730
Comcast Non-Guarantor Subsidiaries [Member]
Service revenue									55,842	37,937	35,756
Management fee revenue									0	0	0
Revenue									55,842	37,937	35,756
Operating costs and expenses									37,860	23,646	22,391
Depreciation									6,011	5,510	5,454
Amortization									1,593	1,074	1,017
Costs and expenses, total									45,464	30,230	28,862
Operating income (loss)									10,378	7,707	6,894
Interest expense									(524)	(146)	(134)
Investment income (loss), net									154	273	271
Equity in net income (losses) of investees, net									(35)	(141)	(64)
Other income (expense), net									(115)	138	22
Nonoperating income (Expense), Total									(520)	124	95
Income (loss) before income taxes									9,858	7,831	6,989
Income tax (expense) benefit									(3,628)	(3,041)	(2,137)
Net income (loss) from consolidated operations									6,230	4,790	4,852
Net (income) loss attributable to noncontrolling interests									(997)	(33)	10
Net income (loss) attributable to Comcast Corporation									5,233	4,757	4,862
Elimination and Consolidation Adjustments [Member]
Service revenue									0	0	0
Management fee revenue									(2,072)	(1,986)	(1,885)
Revenue									(2,072)	(1,986)	(1,885)
Operating costs and expenses									(2,072)	(1,986)	(1,885)
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									(2,072)	(1,986)	(1,885)
Operating income (loss)									0	0	0
Interest expense									0	0	0
Investment income (loss), net									0	0	0
Equity in net income (losses) of investees, net									(19,572)	(16,760)	(17,202)
Other income (expense), net									0	0	0
Nonoperating income (Expense), Total									(19,572)	(16,760)	(17,202)
Income (loss) before income taxes									(19,572)	(16,760)	(17,202)
Income tax (expense) benefit									0	0	0
Net income (loss) from consolidated operations									(19,572)	(16,760)	(17,202)
Net (income) loss attributable to noncontrolling interests									0	0	0
Net income (loss) attributable to Comcast Corporation									$ (19,572)	$ (16,760)	$ (17,202)

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net cash provided by (used in) operating activities		$ 14,345	$ 11,179	$ 10,281
Investing Activities
Net transactions with affiliates		0	0	0
Capital expenditures		(5,307)	(4,961)	(5,117)
Cash paid for intangible assets		(954)	(536)	(522)
Acquisitions, net of cash acquired		(6,407)	(183)	(88)
Proceeds from sales of businesses and investments		277	99	102
Purchases of investments		(135)	(260)	(346)
Other		18	130	74
Net cash provided by (used in) investing activities		(12,508)	(5,711)	(5,897)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		544	0	0
Proceeds from borrowings		0	3,420	1,564
Repurchases and repayments of debt	$ (563)	(3,216)	(1,153)	(4,738)
Repurchases and retirements of common stock		(2,141)	(1,200)	(765)
Dividends paid		(1,187)	(1,064)	(761)
Issuances of common stock		283	34	1
Distributions (to) from noncontrolling interests		(325)	(67)	(49)
Other		(159)	(125)	(160)
Net cash provided by (used in) financing activities		(6,201)	(155)	(4,908)
Increase (decrease) in cash and cash equivalents		(4,364)	5,313	(524)
Cash and cash equivalents, beginning of year	1,620	5,984	671	1,195
Cash and cash equivalents, end of year		1,620	5,984	671
Comcast [Member]
Operating Activities
Net cash provided by (used in) operating activities		(513)	(391)	115
Investing Activities
Net transactions with affiliates		4,615	488	1,215
Capital expenditures		(7)	(7)	(25)
Cash paid for intangible assets		(2)	(2)	(11)
Acquisitions, net of cash acquired		0	0	0
Proceeds from sales of businesses and investments		0	0	0
Purchases of investments		0	0	0
Other		0	0	0
Net cash provided by (used in) investing activities		4,606	479	1,179
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		(4)
Proceeds from borrowings		0	3,390	1,492
Repurchases and repayments of debt		(1,095)	(1,100)	(1,241)
Repurchases and retirements of common stock		(2,141)	(1,200)	(765)
Dividends paid		(1,187)	(1,064)	(761)
Issuances of common stock		283	34	1
Distributions (to) from noncontrolling interests		0	0	0
Other		51	(148)	(20)
Net cash provided by (used in) financing activities		(4,093)	(88)	(1,294)
Increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0
Cash and cash equivalents, end of year		0	0	0
CCCL Parent [Member]
Operating Activities
Net cash provided by (used in) operating activities		(209)	(257)	(472)
Investing Activities
Net transactions with affiliates		1,209	257	3,438
Capital expenditures		0	0	0
Cash paid for intangible assets		0	0	0
Acquisitions, net of cash acquired		0	0	0
Proceeds from sales of businesses and investments		0	0	0
Purchases of investments		0	0	0
Other		0	0	0
Net cash provided by (used in) investing activities		1,209	257	3,438
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		0
Proceeds from borrowings		0	0	0
Repurchases and repayments of debt		(1,000)	0	(2,836)
Repurchases and retirements of common stock		0	0	0
Dividends paid		0	0	0
Issuances of common stock		0	0	0
Distributions (to) from noncontrolling interests		0	0	0
Other		0	0	(130)
Net cash provided by (used in) financing activities		(1,000)	0	(2,966)
Increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0
Cash and cash equivalents, end of year		0	0	0
Combined CCHMO Parents [Member]
Operating Activities
Net cash provided by (used in) operating activities		(131)	(132)	(185)
Investing Activities
Net transactions with affiliates		131	132	539
Capital expenditures		0	0	0
Cash paid for intangible assets		0	0	0
Acquisitions, net of cash acquired		0	0	0
Proceeds from sales of businesses and investments		0	0	0
Purchases of investments		0	0	0
Other		0	0	0
Net cash provided by (used in) investing activities		131	132	539
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		0
Proceeds from borrowings		0	0	0
Repurchases and repayments of debt		0	0	(312)
Repurchases and retirements of common stock		0	0	0
Dividends paid		0	0	0
Issuances of common stock		0	0	0
Distributions (to) from noncontrolling interests		0	0	0
Other		0	0	(42)
Net cash provided by (used in) financing activities		0	0	(354)
Increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0
Cash and cash equivalents, end of year		0	0	0
Comcast Holdings [Member]
Operating Activities
Net cash provided by (used in) operating activities		(19)	(235)	3
Investing Activities
Net transactions with affiliates		19	248	259
Capital expenditures		0	0	0
Cash paid for intangible assets		0	0	0
Acquisitions, net of cash acquired		0	0	0
Proceeds from sales of businesses and investments		0	0	0
Purchases of investments		0	0	0
Other		0	0	0
Net cash provided by (used in) investing activities		19	248	259
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		0
Proceeds from borrowings		0	0	0
Repurchases and repayments of debt		0	(13)	(262)
Repurchases and retirements of common stock		0	0	0
Dividends paid		0	0	0
Issuances of common stock		0	0	0
Distributions (to) from noncontrolling interests		0	0	0
Other		0	0	0
Net cash provided by (used in) financing activities		0	(13)	(262)
Increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents, beginning of year	0	0	0	0
Cash and cash equivalents, end of year		0	0	0
Comcast Non-Guarantor Subsidiaries [Member]
Operating Activities
Net cash provided by (used in) operating activities		15,217	12,194	10,820
Investing Activities
Net transactions with affiliates		(5,974)	(1,125)	(5,451)
Capital expenditures		(5,300)	(4,954)	(5,092)
Cash paid for intangible assets		(952)	(534)	(511)
Acquisitions, net of cash acquired		(6,407)	(183)	(88)
Proceeds from sales of businesses and investments		277	99	102
Purchases of investments		(135)	(260)	(346)
Other		18	130	74
Net cash provided by (used in) investing activities		(18,473)	(6,827)	(11,312)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		548
Proceeds from borrowings		0	30	72
Repurchases and repayments of debt		(1,121)	(40)	(87)
Repurchases and retirements of common stock		0	0	0
Dividends paid		0	0	0
Issuances of common stock		0	0	0
Distributions (to) from noncontrolling interests		(325)	(67)	(49)
Other		(210)	23	32
Net cash provided by (used in) financing activities		(1,108)	(54)	(32)
Increase (decrease) in cash and cash equivalents		(4,364)	5,313	(524)
Cash and cash equivalents, beginning of year	1,620	5,984	671	1,195
Cash and cash equivalents, end of year		1,620	5,984	671
Elimination and Consolidation Adjustments [Member]
Operating Activities
Net cash provided by (used in) operating activities		0	0	0
Investing Activities
Net transactions with affiliates		0	0	0
Capital expenditures		0	0	0
Cash paid for intangible assets		0	0	0
Acquisitions, net of cash acquired		0	0	0
Proceeds from sales of businesses and investments		0	0	0
Purchases of investments		0	0	0
Other		0	0	0
Net cash provided by (used in) investing activities		0	0	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net		0
Proceeds from borrowings		0	0	0
Repurchases and repayments of debt		0	0	0
Repurchases and retirements of common stock		0	0	0
Dividends paid		0	0	0
Issuances of common stock		0	0	0
Distributions (to) from noncontrolling interests		0	0	0
Other		0	0	0
Net cash provided by (used in) financing activities		0	0	0
Increase (decrease) in cash and cash equivalents		0	0	0
Cash and cash equivalents, beginning of year	$ 0	0	0	0
Cash and cash equivalents, end of year		$ 0	$ 0	$ 0

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 173	$ 175	$ 190
Additions Charged to Costs and Expenses	306	327	385
Deductions from Reserves	277	329	400
Balance at End of Year	202	173	$ 175
Sales Returns and Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	0
Additions Charged to Costs and Expenses	536
Deductions from Reserves	111
Balance at End of Year	$ 425	$ 0