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Three Months Ended
March 31

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Document and Entity Information	3 Months Ended
Document and Entity Information	Mar. 31, 2017 shares
Document And Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
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
NBCUniversal Media LLC [Member]
Document And Entity Information [Line Items]
Entity Registrant Name	NBCUniversal Media, LLC
Entity Central Index Key	0000902739
Entity Filer Category	Non-accelerated Filer
Class A Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	4,733,512,494
Class B Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	9,444,375

Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 4,022	$ 3,301
Receivables, net	7,525	7,955
Programming rights	1,479	1,250
Other current assets	2,219	3,855
Total current assets	15,245	16,361
Film and television costs	6,968	7,252
Investments	5,938	5,247
Property and equipment, net	36,626	36,253
Franchise rights	59,364	59,364
Goodwill	36,592	35,980
Other intangible assets, net	19,014	17,274
Other noncurrent assets, net	2,732	2,769
Total assets	182,479	180,500
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	6,658	6,915
Accrued participations and residuals	1,811	1,726
Deferred revenue	1,234	1,132
Accrued expenses and other current liabilities	5,862	6,282
Current portion of long-term debt	3,509	5,480
Total current liabilities	19,074	21,535
Long-term debt, less current portion	58,276	55,566
Deferred income taxes	35,348	34,854
Other noncurrent liabilities	10,677	10,925
Commitments and contingencies
Redeemable noncontrolling interests	1,456	1,446
Equity:
Preferred stock—authorized, 20,000,000 shares; issued, zero	0	0
Common stock	56	56
Additional paid-in capital	38,115	38,230
Retained earnings	24,063	23,076
Treasury stock, 872,791,028 Class A common shares	(7,517)	(7,517)
Accumulated other comprehensive income (loss)	342	98
Total Comcast Corporation shareholders’ equity	55,059	53,943
Noncontrolling interests	2,589	2,231
Total equity	57,648	56,174
Total liabilities and equity	182,479	180,500
NBCUniversal Media LLC [Member]
Current Assets:
Cash and cash equivalents	1,882	1,966
Receivables, net	6,227	6,302
Programming rights	1,471	1,241
Other current assets	1,164	938
Total current assets	10,744	10,447
Film and television costs	6,961	7,245
Investments	1,940	1,263
Property and equipment, net	10,695	10,511
Goodwill	23,793	23,323
Intangible assets, net	13,655	13,777
Other noncurrent assets, net	1,561	1,688
Total assets	69,349	68,254
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	1,487	1,647
Accrued participations and residuals	1,811	1,726
Program obligations	681	807
Deferred revenue	1,143	1,016
Accrued expenses and other current liabilities	1,573	1,888
Note payable to Comcast	1,853	2,703
Current portion of long-term debt	115	127
Total current liabilities	8,663	9,914
Long-term debt, less current portion	11,623	11,461
Accrued participations, residuals and program obligations	1,164	1,202
Other noncurrent liabilities	4,039	4,130
Commitments and contingencies
Redeemable noncontrolling interests	527	530
Equity:
Member’s capital	40,792	39,036
Accumulated other comprehensive income (loss)	71	(135)
Total NBCUniversal member’s equity	40,863	38,901
Noncontrolling interests	2,470	2,116
Total equity	43,333	41,017
Total liabilities and equity	69,349	68,254
Class A Common Stock [Member]
Equity:
Common stock	56	56
Class B Common Stock [Member]
Equity:
Common stock	$ 0	$ 0

Condensed Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Accumulated depreciation	$ 49,991	$ 49,694
Accumulated amortization	11,442	11,013
NBCUniversal Media LLC [Member]
Accumulated depreciation	3,567	3,350
Accumulated amortization	$ 6,854	$ 6,568
Class A Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	7,500,000,000	7,500,000,000
Common stock, shares issued (in shares)	5,606,303,522	5,614,950,039
Common stock, shares outstanding (in shares)	4,733,512,494	4,742,159,011
Treasury stock (in shares)	872,791,028	872,791,028
Class B Common Stock [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	9,444,375	9,444,375
Common stock, shares outstanding (in shares)	9,444,375	9,444,375

Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue	$ 20,463	$ 18,790
Costs and Expenses:
Programming and production	6,074	5,431
Other operating and administrative	5,827	5,526
Advertising, marketing and promotion	1,530	1,466
Depreciation	1,915	1,785
Amortization	587	493
Total costs and expenses	15,933	14,701
Operating income	4,530	4,089
Other Income (Expense):
Interest expense	(755)	(703)
Investment income (loss), net	59	30
Equity in net income (losses) of investees, net	36	(11)
Other income (expense), net	35	130
Other income (expense) items, net	(625)	(554)
Income before income taxes	3,905	3,535
Income tax expense	(1,258)	(1,311)
Net income	2,647	2,224
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(81)	(90)
Net income attributable to Parent	$ 2,566	$ 2,134
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.54	$ 0.44
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	0.53	0.43
Dividends declared per common share (in dollars per share)	$ 0.1575	$ 0.1375
NBCUniversal Media LLC [Member]
Revenue	$ 7,868	$ 6,861
Costs and Expenses:
Programming and production	3,313	2,965
Other operating and administrative	1,832	1,595
Advertising, marketing and promotion	706	679
Depreciation	231	192
Amortization	277	222
Total costs and expenses	6,359	5,653
Operating income	1,509	1,208
Other Income (Expense):
Interest expense	(143)	(147)
Investment income (loss), net	14	6
Equity in net income (losses) of investees, net	(26)	(2)
Other income (expense), net	11	115
Other income (expense) items, net	(144)	(28)
Income before income taxes	1,365	1,180
Income tax expense	(92)	(98)
Net income	1,273	1,082
Net (income) loss attributable to noncontrolling interests	(73)	(80)
Net income attributable to Parent	$ 1,200	$ 1,002

Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net income	$ 2,647	$ 2,224
Unrealized gains (losses) on marketable securities, net of deferred taxes	104	2
Deferred gains (losses) on cash flow hedges, net of deferred taxes	7	(31)
Amounts reclassified to net income:
Realized (gains) losses on marketable securities, net of deferred taxes	0	(1)
Realized (gains) losses on cash flow hedges, net of deferred taxes	0	17
Employee benefit obligations, net of deferred taxes	63	2
Currency translation adjustments, net of deferred taxes	157	238
Comprehensive income	2,978	2,451
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(81)	(90)
Other comprehensive (income) loss attributable to noncontrolling interests	(87)	(137)
Comprehensive income attributable to Parent	2,810	2,224
NBCUniversal Media LLC [Member]
Net income	1,273	1,082
Unrealized gains (losses) on marketable securities, net of deferred taxes	1	0
Deferred gains (losses) on cash flow hedges, net of deferred taxes	(14)	(18)
Amounts reclassified to net income:
Employee benefit obligations, net of deferred taxes	106	4
Currency translation adjustments, net of deferred taxes	200	295
Comprehensive income	1,566	1,363
Net (income) loss attributable to noncontrolling interests	(73)	(80)
Other comprehensive (income) loss attributable to noncontrolling interests	(87)	(137)
Comprehensive income attributable to Parent	$ 1,406	$ 1,146

Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Unrealized gains (losses) on marketable securities, deferred taxes	$ (61)	$ (1)
Deferred gains (losses) on cash flow hedges, deferred taxes	(4)	18
Realized (gains) losses on marketable securities, deferred taxes	0	1
Realized (gains) losses on cash flow hedges, deferred taxes	0	(10)
Employee benefit obligations, deferred taxes	(37)	(2)
Currency translation adjustments, deferred taxes	$ (41)	$ (58)

Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net cash provided by operating activities	$ 5,656	$ 5,399
Investing Activities
Capital expenditures	(2,078)	(1,885)
Cash paid for intangible assets	(416)	(378)
Acquisitions and construction of real estate properties	(130)	(140)
Acquisitions, net of cash acquired	(216)	(24)
Proceeds from sales of investments	51	110
Purchases of investments	(1,062)	(448)
Other	57	56
Net cash provided by (used in) investing activities	(3,794)	(2,709)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,893)	(538)
Proceeds from borrowings	3,500	3,323
Repurchases and repayments of debt	(1,059)	(48)
Repurchases of common stock under repurchase program and employee plans	(996)	(1,427)
Dividends paid	(657)	(611)
Issuances of common stock	0	12
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(72)	(77)
Other	36	9
Net cash provided by (used in) financing activities	(1,141)	643
Increase (decrease) in cash and cash equivalents	721	3,333
Cash and cash equivalents, beginning of period	3,301	2,295
Cash and cash equivalents, end of period	4,022	5,628
NBCUniversal Media LLC [Member]
Operating Activities
Net cash provided by operating activities	1,477	1,177
Investing Activities
Capital expenditures	(285)	(295)
Cash paid for intangible assets	(55)	(52)
Acquisitions of real estate properties	0	(78)
Proceeds from sales of investments	10	101
Other	(105)	(14)
Net cash provided by (used in) investing activities	(435)	(338)
Financing Activities
Repurchases and repayments of debt	(49)	(35)
Proceeds from (repayments of) borrowings from Comcast, net	(849)	(875)
Distributions to member	(195)	(195)
Distributions to noncontrolling interests	(61)	(63)
Other	28	0
Net cash provided by (used in) financing activities	(1,126)	(1,168)
Increase (decrease) in cash and cash equivalents	(84)	(329)
Cash and cash equivalents, beginning of period	1,966	1,410
Cash and cash equivalents, end of period	$ 1,882	$ 1,081

Condensed Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Redeemable Noncontrolling Interests And Redeemable Subsidiary Preferred Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	NBCUniversal Media LLC [Member]	NBCUniversal Media LLC [Member] Redeemable Noncontrolling Interest [Member]	NBCUniversal Media LLC [Member] Member's Capital [Member]	NBCUniversal Media LLC [Member] Accumulated Other Comprehensive Income (Loss) [Member]	NBCUniversal Media LLC [Member] Noncontrolling Interest [Member]	Class A Common Stock [Member] Common Stock [Member]	Class B Common Stock [Member] Common Stock [Member]
Beginning balance at Dec. 31, 2015								$ 34,303		$ 32,834	$ (212)	$ 1,681
Beginning balance at Dec. 31, 2015	$ 53,978		$ 38,490	$ 21,413	$ (7,517)	$ (174)	$ 1,709						$ 57	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	228		228
Repurchases of common stock under repurchase program and employee plans	(1,437)		(310)	(1,127)
Employee stock purchase plans	33		33
Dividends declared	(670)			(670)				(195)		(195)
Contributions from (distributions to) noncontrolling interests, net	(36)						(36)	(41)				(41)
Other comprehensive income (loss)	227					90	137	281			144	137
Other	(5)		(5)					1		1
Net income (loss)	2,194			2,134			60	1,063		1,002		61
Ending balance at Mar. 31, 2016	54,512		38,436	21,750	(7,517)	(84)	1,870						57	0
Ending balance at Mar. 31, 2016								35,412		33,642	(68)	1,838
Beginning balance at Dec. 31, 2015		$ 1,221							$ 372
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions from (distributions to) noncontrolling interests, net		(5)							(22)
Other		(10)
Net income (loss)		30							19
Ending balance at Mar. 31, 2016		1,236							369
Beginning balance at Dec. 31, 2016								41,017		39,036	(135)	2,116
Beginning balance at Dec. 31, 2016	56,174		38,230	23,076	(7,517)	98	2,231						56	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	114		114
Repurchases of common stock under repurchase program and employee plans	(1,006)		(178)	(828)
Employee stock purchase plans	39		39
Dividends declared	(751)			(751)				(195)		(195)
Contributions from (distributions to) noncontrolling interests, net	(34)						(34)	(41)				(41)
Contribution from member								662		662
Other comprehensive income (loss)	331					244	87	293			206	87
Other	163		(90)				253	342		89		253
Net income (loss)	2,618			2,566			52	1,255		1,200		55
Ending balance at Mar. 31, 2017	57,648		$ 38,115	$ 24,063	$ (7,517)	$ 342	$ 2,589						$ 56	$ 0
Ending balance at Mar. 31, 2017								43,333		$ 40,792	$ 71	$ 2,470
Beginning balance at Dec. 31, 2016	1,446	1,446						530	530
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions from (distributions to) noncontrolling interests, net		(8)							(20)
Other		(11)							(1)
Net income (loss)		29							18
Ending balance at Mar. 31, 2017	$ 1,456	$ 1,456						$ 527	$ 527

Condensed Consolidated Financial Statements	3 Months Ended
Condensed Consolidated Financial Statements	Mar. 31, 2017
Condensed Consolidated Financial Statements [Line Items]
Condensed Consolidated Financial Statements	Condensed Consolidated Financial Statements Basis of Presentation We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year. The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2016 Annual Report on Form 10-K. Stock Split On January 24, 2017, our Board of Directors approved a two-for-one stock split in the form of a 100% stock dividend that was distributed on February 17, 2017 to shareholders of record as of February 8, 2017. The stock split was in the form of one additional share for every share held and was payable in shares of Class A common stock on the existing Class A common stock and Class B common stock. All share-based data, including the number of shares outstanding and per share amounts, have been adjusted to reflect the stock split for all periods presented. Reclassifications Reclassifications have been made to our condensed consolidated financial statements for the prior year period to conform to classifications used in 2017.
NBCUniversal Media LLC [Member]
Condensed Consolidated Financial Statements [Line Items]
Condensed Consolidated Financial Statements	Condensed Consolidated Financial Statements Basis of Presentation Unless indicated otherwise, throughout these notes to the condensed consolidated financial statements, we refer to NBCUniversal and its consolidated subsidiaries as “we,” “us” and “our.” We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year. The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2016 Annual Report on Form 10-K.

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Mar. 31, 2017
Recent Accounting Pronouncements [Line Items]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our financial position or results of operations. However, we do expect that the new standard will impact the timing of recognition for (1) our Cable Communications segment’s installation revenue and commission expenses, which upon adoption will be recognized as revenue and costs over a period of time instead of immediately, and (2) our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The updated guidance also requires additional disclosures regarding our revenue transactions. The updated guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Financial Assets and Financial Liabilities In January 2016, the FASB updated the accounting guidance related to the recognition and measurement of financial assets and financial liabilities. The updated accounting guidance, among other things, requires that all nonconsolidated equity investments, except those accounted for under the equity method, be measured at fair value and that the changes in fair value be recognized in net income. The updated guidance is effective for us as of January 1, 2018. The updated accounting guidance requires a cumulative effect adjustment to beginning retained earnings in the year the guidance is adopted with certain exceptions. If we had adopted the provisions of the updated guidance as of January 1, 2017 for our equity investments classified as available-for-sale securities, net income attributable to Comcast Corporation would have increased by $104 million for the three months ended March 31, 2017. We are currently in the process of determining the impact that the updated accounting guidance will have on our cost method investments. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Share-Based Compensation In March 2016, the FASB updated the accounting guidance that affects several aspects of the accounting for share-based compensation. The most significant change for us relates to the presentation of the income and withholding tax consequences of share-based compensation in our consolidated financial statements. Among the changes, the updated guidance requires that the excess income tax benefits or deficiencies that arise when the tax consequences of share-based compensation differ from amounts previously recognized in the statement of income be recognized as income tax benefit or expense in the statement of income rather than as additional paid-in capital in the balance sheet. The guidance also states that excess income tax benefits should not be presented separately from other income taxes in the statement of cash flows and, thus, should be classified as an operating activity rather than a financing activity as they were under the prior guidance. In addition, the updated guidance requires that, when an employer withholds shares upon exercise of options or the vesting of restricted stock for the purpose of meeting withholding tax requirements, the cash paid for withholding taxes be classified as a financing activity and we include these amounts in the caption “repurchases of common stock under repurchase program and employee plans” in our consolidated statement of cash flows. We previously recorded these amounts as operating activities. We adopted the updated guidance as of January 1, 2017 and as required, we prospectively adopted the provisions that relate to the recognition of the excess income tax benefits or deficiencies in the statement of income. The excess tax benefits resulted in a decrease to income tax expense of $139 million and an increase to diluted earnings per common share attributable to Comcast Corporation shareholders of $0.03 for the three months ended March 31, 2017. The prior year period in our consolidated statement of income was not adjusted as a result of these provisions. In addition, we retrospectively adopted the provisions of this guidance related to changes to the statement of cash flows for all periods presented. This resulted in increases to net cash provided by operating activities and decreases to net cash provided by (used in) financing activities of $385 million and $289 million for the three months ended March 31, 2017 and 2016, respectively.
NBCUniversal Media LLC [Member]
Recent Accounting Pronouncements [Line Items]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our financial position or results of operations. However, we do expect that the new standard will impact the timing of recognition for our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The updated guidance also requires additional disclosures regarding our revenue transactions. The updated guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Financial Assets and Financial Liabilities In January 2016, the FASB updated the accounting guidance related to the recognition and measurement of financial assets and financial liabilities. The updated accounting guidance, among other things, requires that all nonconsolidated equity investments, except those accounted for under the equity method, be measured at fair value and that the changes in fair value be recognized in net income, such as changes in the fair value of our investment in Snap Inc. (see Note 6). The updated guidance is effective for us as of January 1, 2018. The updated accounting guidance requires a cumulative effect adjustment to beginning retained earnings in the year the guidance is adopted with certain exceptions. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305

+ Details

Earnings Per Share

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Earnings Per Share

Computation of Diluted EPS



	Three Months Ended March 31
	2017					2016
(in millions, except per share amounts)	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	$	2,566	4,747	$	0.54	$	2,134	4,868	$	0.44
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			85					57
Diluted EPS attributable to Comcast Corporation shareholders	$	2,566	4,832	$	0.53	$	2,134	4,925	$	0.43

Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Our potentially dilutive securities include potential common shares related to our stock options and our restricted share units (“RSUs”). The amount of potential common shares related to our share-based compensation plans that were excluded from diluted EPS because their effect would have been antidilutive was not material for the three months ended March 31, 2017 and 2016.

Significant Transactions

3 Months Ended

Mar. 31, 2017

Business Acquisition [Line Items]

Significant Transactions

FCC Spectrum Auction

On April 13, 2017, the Federal Communications Commission (“FCC”) announced the results of its spectrum auction. In the auction, NBCUniversal agreed to relinquish FCC licenses for spectrum in the New York, Philadelphia and Chicago designated market areas (“DMAs”) and will receive proceeds of $482 million. As of March 31, 2017, the book value of these licenses was $144 million and was recorded in other current assets in the condensed consolidated balance sheet. NBCUniversal will share broadcast signals for its NBC and Telemundo stations in these DMAs. In connection with the auction, we also agreed to acquire $1.7 billion of spectrum. We had previously made a deposit of $1.8 billion to participate in the auction, which was recorded in other intangible assets in the condensed consolidated balance sheet as of March 31, 2017.

Universal Studios Japan

On April 6, 2017, we acquired the remaining interests in Universal Studios Japan that we did not already own for approximately $2.3 billion. The acquisition was funded through cash on hand and borrowings under our commercial paper program. During the second quarter of 2017, we obtained commitments from lenders to refinance the Universal Studios Japan term loans, which we expect will, among other things, increase the borrowings, extend the maturity date and include a guarantee from us. We expect to use a portion of the Universal Studios Japan term loans proceeds to repay a portion of amounts outstanding under our commercial paper program.

DreamWorks Animation

On August 22, 2016, we acquired all of the outstanding stock of DreamWorks Animation for $3.8 billion. DreamWorks Animation’s stockholders received $41 in cash for each share of DreamWorks Animation common stock. DreamWorks Animation creates animated feature films, television series and specials, live entertainment, and related consumer products. The results of operations for DreamWorks Animation are reported in our Filmed Entertainment segment following the acquisition date.

Preliminary Allocation of Purchase Price

The transaction was accounted for under the acquisition method of accounting and, accordingly, the assets and liabilities are to be recorded at their fair market values as of the acquisition date. We recorded the acquired assets and liabilities of DreamWorks Animation at their estimated fair values based on preliminary valuation analyses. In valuing acquired assets and liabilities, fair value estimates were primarily based on Level 3 inputs, including future expected cash flows, market rate assumptions and discount rates. The fair value of the assumed debt was primarily based on quoted market values. The fair value of the liability related to a tax receivable agreement that DreamWorks Animation had previously entered into with one of its former stockholders (the “tax receivable agreement”) was based on the contractual settlement provisions in the agreement. Further, we recorded the deferred income taxes based on our estimates of the tax basis of the acquired net assets and the valuation allowances based on the expected use of net operating loss carryforwards. The goodwill is not deductible for tax purposes. During the three months ended March 31, 2017, we updated the preliminary allocation of purchase price for DreamWorks Animation, which primarily resulted in increases to intangible assets, noncontrolling interests and goodwill and a decrease in deferred income tax assets. The changes did not have a material impact on our condensed consolidated financial statements. We may adjust these amounts further as valuations are finalized and we obtain information necessary to complete the analyses, but no later than one year from the acquisition date.

The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation.



Preliminary Allocation of Purchase Price
(in millions)
Film and television costs	$	854
Intangible assets	362
Working capital	232
Debt	(381		)
Tax receivable agreement	(146		)
Deferred income taxes	293
Other noncurrent assets and liabilities	114
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interests	(337		)
Goodwill	2,782
Cash consideration transferred	$	3,773

The tax receivable agreement was settled immediately following the acquisition and the payment was recorded as an operating activity in our condensed consolidated statement of cash flows in the third quarter of 2016. In addition, we repaid all of the assumed debt of DreamWorks Animation in the third quarter of 2016.

Revenue and net income attributable to the acquisition of DreamWorks Animation were not material for the three months ended March 31, 2017.

NBCUniversal Media LLC [Member]

Business Acquisition [Line Items]

Significant Transactions

FCC Spectrum Auction

On April 13, 2017, the Federal Communications Commission (“FCC”) announced the results of its spectrum auction. In the auction, we agreed to relinquish FCC licenses for spectrum in the New York, Philadelphia and Chicago designated market areas (“DMAs”) and will receive proceeds of $482 million. As of March 31, 2017, the book value of these licenses was $144 million and was recorded in other current assets in the condensed consolidated balance sheet. We will share broadcast signals for our NBC and Telemundo stations in these DMAs.

Universal Studios Japan

On April 6, 2017, we acquired the remaining interests in Universal Studios Japan that we did not already own for approximately $2.3 billion. The acquisition was funded through borrowings under our revolving credit agreement with Comcast. During the second quarter of 2017, we obtained commitments from lenders to refinance the Universal Studios Japan term loans, which we expect will, among other things, increase the borrowings, extend the maturity date and include a guarantee from Comcast. We expect to use a portion of the Universal Studios Japan term loans proceeds to repay a portion of amounts outstanding under our revolving credit agreement with Comcast.

DreamWorks Animation

On August 22, 2016, Comcast acquired all of the outstanding stock of DreamWorks Animation for $3.8 billion. DreamWorks Animation’s stockholders received $41 in cash for each share of DreamWorks Animation common stock. DreamWorks Animation creates animated feature films, television series and specials, live entertainment, and related consumer products.

Following the acquisition, Comcast converted DreamWorks Animation to a limited liability company and contributed its equity to us as a capital contribution. The net assets contributed to us excluded deferred income taxes and other tax-related items recorded by Comcast. The results of operations for DreamWorks Animation are reported in our Filmed Entertainment segment following the acquisition date and are presented as if the initial equity contribution occurred on the date of Comcast’s acquisition.

Preliminary Allocation of Purchase Price

The transaction was accounted for under the acquisition method of accounting and, accordingly, the assets and liabilities are to be recorded at their fair market values as of the acquisition date. We recorded the acquired assets and liabilities of DreamWorks Animation at their estimated fair values based on preliminary valuation analyses. In valuing acquired assets and liabilities, fair value estimates were primarily based on Level 3 inputs, including future expected cash flows, market rate assumptions and discount rates. The fair value of the assumed debt was primarily based on quoted market values. The fair value of the liability related to a tax receivable agreement that DreamWorks Animation had previously entered into with one of its former stockholders (the “tax receivable agreement”) was based on the contractual settlement provisions in the agreement. During the three months ended March 31, 2017, we updated the preliminary allocation of purchase price for DreamWorks Animation, which primarily resulted in increases to intangible assets, noncontrolling interests and goodwill. The changes did not have a material impact on our condensed consolidated financial statements. We may adjust these amounts further as valuations are finalized and we obtain information necessary to complete the analyses, but no later than one year from the acquisition date.

The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation.



Preliminary Allocation of Purchase Price
(in millions)
Film and television costs	$	854
Intangible assets	362
Working capital	232
Debt	(381		)
Tax receivable agreement^(a)	(146		)
Other noncurrent assets and liabilities and other^(b)	407
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interests	(337		)
Goodwill	2,782
Cash consideration transferred	$	3,773

(a)

The tax receivable agreement was settled immediately following the acquisition and the payment was recorded as an operating activity in our condensed consolidated statement of cash flows in the third quarter of 2016. Comcast made a separate cash capital contribution of $146 million to fund the settlement which was recorded as a financing activity in our condensed consolidated statement of cash flows in the third quarter of 2016.


(b)	Other included $281 million recorded to member’s capital that represented deferred income tax assets and other tax-related items recorded by Comcast but excluded from the net assets contributed to us.

Revenue and net income attributable to the acquisition of DreamWorks Animation were not material for the three months ended March 31, 2017.

Related Party Transactions

3 Months Ended

Mar. 31, 2017

NBCUniversal Media LLC [Member]

Related Party Transactions

In the ordinary course of our business, we enter into transactions with Comcast.

We generate revenue from Comcast primarily from the distribution of our cable network programming, the fees received under retransmission consent agreements in our Broadcast Television segment and, to a lesser extent, the sale of advertising and our owned programming, and we incur expenses primarily related to advertising and various support services provided by Comcast to us.

Comcast is also the counterparty to one of our contractual obligations. As of March 31, 2017, the carrying value of the liability associated with this contractual obligation was $383 million.

The following tables present transactions with Comcast and its consolidated subsidiaries that are included in our condensed consolidated financial statements.

Condensed Consolidated Balance Sheet



(in millions)	March 31, 2017		December 31, 2016
Transactions with Comcast and Consolidated Subsidiaries
Receivables, net	$	322	$	285
Accounts payable and accrued expenses related to trade creditors	$	42	$	55
Accrued expenses and other current liabilities	$	19	$	4
Note payable to Comcast	$	1,853	$	2,703
Other noncurrent liabilities	$	389	$	389

Condensed Consolidated Statement of Income



	Three Months Ended March 31
(in millions)	2017			2016
Transactions with Comcast and Consolidated Subsidiaries
Revenue	$	459		$	406
Operating costs and expenses	$	(61	)	$	(60	)
Other income (expense)	$	(19	)	$	(13	)

Film and Television Costs

3 Months Ended

Mar. 31, 2017

Film And Television Cost [Line Items]

Film And Television Costs

Film and Television Costs



(in millions)	March 31, 2017		December 31, 2016
Film Costs:
Released, less amortization	$	1,657	$	1,750
Completed, not released	469		50
In production and in development	982		1,310
	3,108		3,110
Television Costs:
Released, less amortization	2,008		1,953
In production and in development	729		853
	2,737		2,806
Programming rights, less amortization	2,602		2,586
	8,447		8,502
Less: Current portion of programming rights	1,479		1,250
Film and television costs	$	6,968	$	7,252

NBCUniversal Media LLC [Member]

Film And Television Cost [Line Items]

Film And Television Costs

Film and Television Costs



(in millions)	March 31, 2017		December 31, 2016
Film Costs:
Released, less amortization	$	1,657	$	1,750
Completed, not released	469		50
In production and in development	982		1,310
	3,108		3,110
Television Costs:
Released, less amortization	2,008		1,953
In production and in development	729		853
	2,737		2,806
Programming rights, less amortization	2,587		2,570
	8,432		8,486
Less: Current portion of programming rights	1,471		1,241
Film and television costs	$	6,961	$	7,245

Investments

3 Months Ended

Mar. 31, 2017

Fair Value, Equity And Cost Method Investments [Line Items]

Investments



(in millions)	March 31, 2017		December 31, 2016
Fair Value Method:
Snap	$	662	$	—
Other	161		198
	823		198
Equity Method:
Atairos	1,624		1,601
Hulu	171		225
Other	631		550
	2,426		2,376
Cost Method:
AirTouch	1,602		1,599
BuzzFeed	400		400
Other	698		771
	2,700		2,770
Total investments	5,949		5,344
Less: Current investments	11		97
Noncurrent investments	$	5,938	$	5,247

Investment Income (Loss), Net



	Three Months Ended March 31
(in millions)	2017			2016
Gains (losses) on sales and exchanges of investments, net	$	(1	)	$	2
Investment impairment losses	(4		)	(20		)
Interest and dividend income	33			29
Other, net	31			19
Investment income (loss), net	$	59		$	30

Fair Value Method

Snap

In March 2017, we acquired an interest in Snap Inc. for $500 million as part of its initial public offering, which we have classified as available for sale. Snap is a camera company whose primary product is Snapchat, a camera app that was created to help people communicate through short videos and images.

Equity Method

Atairos

For the three months ended March 31, 2017, we made cash capital contributions totaling $457 million to Atairos Group, Inc., which included amounts accrued as of December 31, 2016. Atairos follows investment company accounting and records its investments at their fair values each reporting period with the net gains or losses reflected in its statement of income. We recognize our share of these gains and losses in equity in net income (losses) of investees, net. For the three months ended March 31, 2017, we recognized our share of Atairos income of $57 million. For the three months ended March 31, 2016, we recognized our share of Atairos losses of $15 million.

The Weather Channel

In January 2016, following a legal restructuring at The Weather Channel, we and the other investors sold the entity holding The Weather Channel’s product and technology businesses to IBM. Following the close of the transaction, we continue to hold an investment in The Weather Channel cable network through a new holding company. As a result of the sale of our investment, we recognized a pretax gain of $108 million in other income (expense), net for the three months ended March 31, 2016.

Cost Method

AirTouch

We hold two series of preferred stock of Verizon Americas, Inc., formerly known as AirTouch Communications, Inc. (“AirTouch”), a subsidiary of Verizon Communications Inc., which are redeemable in April 2020. As of March 31, 2017, the estimated fair value of the AirTouch preferred stock and the estimated fair value of the associated liability related to the redeemable subsidiary preferred shares issued by one of our consolidated subsidiaries were each $1.8 billion. The estimated fair values are based on Level 2 inputs that use pricing models whose inputs are derived primarily from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument.

NBCUniversal Media LLC [Member]

Fair Value, Equity And Cost Method Investments [Line Items]

Investments



(in millions)	March 31, 2017		December 31, 2016
Fair Value Method:
Snap	$	662	$	—
Other	7		6
	669		6
Equity Method:
Hulu	171		225
Other	400		336
	571		561
Cost Method:
BuzzFeed	400		400
Other	300		296
	700		696
Total investments	$	1,940	$	1,263

Fair Value Method

Snap

In March 2017, Comcast acquired an interest in Snap Inc. as part of its initial public offering. On March 31, 2017, Comcast contributed its investment in Snap to us as an equity contribution which was recorded in our condensed consolidated statement of equity based on the fair value of the investment as of March 31, 2017. We have classified our investment as available for sale. Snap is a camera company whose primary product is Snapchat, a camera app that was created to help people communicate through short videos and images.

Equity Method

The Weather Channel

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References + Details

Long-Term Debt	3 Months Ended
Long-Term Debt	Mar. 31, 2017
Debt Instrument [Line Items]
Long-Term Debt	Long-Term Debt As of March 31, 2017, our debt had a carrying value of $61.8 billion and an estimated fair value of $66.7 billion. The estimated fair value of our publicly traded debt was primarily based on Level 1 inputs that use quoted market values for the debt. The estimated fair value of debt for which there are no quoted market prices was based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities. Debt Borrowings and Repayments In March 2017, we issued $1.005 billion aggregate principal amount of 4.45% senior notes due 2047. In January 2017, we issued $1.25 billion aggregate principal amount of 3.00% senior notes due 2024 and $1.25 billion aggregate principal amount of 3.30% senior notes due 2027. In January 2017, we repaid at maturity $1.0 billion aggregate principal amount of 6.50% senior notes due 2017. Revolving Credit Facilities As of March 31, 2017, amounts available under our consolidated revolving credit facilities, net of amounts outstanding under our commercial paper programs and outstanding letters of credit, totaled $7.4 billion, which included $585 million available under NBCUniversal Enterprise’s revolving credit facility. Commercial Paper Programs As of March 31, 2017, NBCUniversal Enterprise had $915 million face amount of commercial paper outstanding. Comcast had no commercial paper outstanding.
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Long-Term Debt	Long-Term Debt As of March 31, 2017, our debt, excluding the note payable to Comcast, had a carrying value of $11.7 billion and an estimated fair value of $12.6 billion. The estimated fair value of our publicly traded debt was primarily based on Level 1 inputs that use quoted market values for the debt. The estimated fair value of debt for which there are no quoted market prices was based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities. Cross-Guarantee Structure We, Comcast and a 100% owned cable holding company subsidiary of Comcast (“CCCL Parent”) have fully and unconditionally guaranteed each other’s debt securities, including the $7 billion Comcast revolving credit facility due 2021. As of March 31, 2017, outstanding debt securities of $45.5 billion of Comcast and CCCL Parent were subject to the guarantee structure. We do not, however, guarantee the obligations of NBCUniversal Enterprise with respect to its $3.3 billion aggregate principal amount of senior notes, $1.5 billion revolving credit facility, commercial paper program, or $725 million liquidation preference of Series A cumulative preferred stock. None of Comcast, CCCL Parent nor NBCUniversal guarantee the $3.4 billion of Universal Studios Japan term loans.

Share-Based Compensation

3 Months Ended

Mar. 31, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation

Our share-based compensation plans consist primarily of awards of RSUs and stock options to certain employees and directors as part of our approach to long-term incentive compensation. Additionally, through our employee stock purchase plans, employees are able to purchase shares of our common stock at a discount through payroll deductions.

In March 2017, we granted 10.6 million RSUs and 39.1 million stock options related to our annual management awards. The weighted-average fair values associated with these grants were $37.42 per RSU and $7.01 per stock option.

Recognized Share-Based Compensation Expense



	Three Months Ended March 31
(in millions)	2017		2016
Restricted share units	$	74	$	70
Stock options	40		37
Employee stock purchase plans	10		8
Total	$	124	$	115

As of March 31, 2017, we had unrecognized pretax compensation expense of $1.0 billion and $569 million related to nonvested RSUs and nonvested stock options, respectively.

NBCUniversal Media LLC [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-Based Compensation

Comcast maintains share-based compensation plans that consist primarily of awards of restricted share units and stock options to certain employees and directors as part of its approach to long-term incentive compensation. Additionally, through its employee stock purchase plans, employees are able to purchase shares of Comcast common stock at a discount through payroll deductions. Certain of our employees participate in these plans and the expense associated with their participation is settled in cash with Comcast.

Recognized Share-Based Compensation Expense



	Three Months Ended March 31
(in millions)	2017		2016
Restricted share units	$	20	$	18
Stock options	2		2
Employee stock purchase plans	3		3
Total	$	25	$	23

- 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 + Details

Supplemental Financial Information

3 Months Ended

Mar. 31, 2017

Supplemental Financial Information [Line Items]

Supplemental Financial Information

Receivables



(in millions)	March 31, 2017		December 31, 2016
Receivables, gross	$	8,111	$	8,622
Less: Allowance for returns and customer incentives	347		417
Less: Allowance for doubtful accounts	239		250
Receivables, net	$	7,525	$	7,955

Accumulated Other Comprehensive Income (Loss)



(in millions)	March 31, 2017			March 31, 2016
Unrealized gains (losses) on marketable securities	$	104		$	2
Deferred gains (losses) on cash flow hedges	(7		)	(60		)
Unrecognized gains (losses) on employee benefit obligations	282			8
Cumulative translation adjustments	(37		)	(34		)
Accumulated other comprehensive income (loss), net of deferred taxes	$	342		$	(84	)

Net Cash Provided by Operating Activities



	Three Months Ended March 31
(in millions)	2017			2016
Net income	$	2,647		$	2,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,502			2,278
Share-based compensation	173			153
Noncash interest expense (income), net	58			55
Equity in net (income) losses of investees, net	(36		)	11
Cash received from investees	17			16
Net (gain) loss on investment activity and other	(53		)	(126		)
Deferred income taxes	265			217
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	465			562
Film and television costs, net	46			(80		)
Accounts payable and accrued expenses related to trade creditors	(190		)	12
Other operating assets and liabilities	(238		)	77
Net cash provided by operating activities	$	5,656		$	5,399

Cash Payments for Interest and Income Taxes



	Three Months Ended March 31
(in millions)	2017		2016
Interest	$	895	$	723
Income taxes	$	132	$	190

Noncash Investing and Financing Activities

During the three months ended March 31, 2017:


•	we acquired $1.2 billion of property and equipment and intangible assets that were accrued but unpaid


•	we recorded a liability of $747 million for a quarterly cash dividend of $0.1575 per common share to be paid in April 2017

NBCUniversal Media LLC [Member]

Supplemental Financial Information [Line Items]

Supplemental Financial Information

Receivables



(in millions)	March 31, 2017		December 31, 2016
Receivables, gross	$	6,647	$	6,799
Less: Allowance for returns and customer incentives	343		413
Less: Allowance for doubtful accounts	77		84
Receivables, net	$	6,227	$	6,302

Accumulated Other Comprehensive Income (Loss)



(in millions)	March 31, 2017			March 31, 2016
Unrealized gains (losses) on marketable securities	$	1		$	—
Deferred gains (losses) on cash flow hedges	9			(19		)
Unrecognized gains (losses) on employee benefit obligations	120			3
Cumulative translation adjustments	(59		)	(52		)
Accumulated other comprehensive income (loss)	$	71		$	(68	)

Net Cash Provided by Operating Activities



	Three Months Ended March 31
(in millions)	2017			2016
Net income	$	1,273		$	1,082
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	508			414
Equity in net (income) losses of investees, net	26			2
Cash received from investees	14			12
Net (gain) loss on investment activity and other	(18		)	(114		)
Deferred income taxes	9			48
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	104			349
Film and television costs, net	46			(84		)
Accounts payable and accrued expenses related to trade creditors	(190		)	(139		)
Other operating assets and liabilities	(295		)	(393		)
Net cash provided by operating activities	$	1,477		$	1,177

Cash Payments for Interest and Income Taxes

Noncash Investing and Financing Activities

During the three months ended March 31, 2017:


•	we acquired $216 million of property and equipment and intangible assets that were accrued but unpaid


•	Comcast contributed its investment in Snap to us at its fair value as of March 31, 2017, which was a noncash transaction (see Note 6 for additional information)

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Redeemable Subsidiary Preferred Stock As of March 31, 2017, the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $763 million. The estimated fair value is based on Level 2 inputs that use pricing models whose inputs are derived primarily from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument. Contingencies We are a defendant in a lawsuit filed in December 2011 by Sprint Communications Company L.P. (“Sprint”) in the United States District Court for the District of Kansas. Sprint’s initial complaint alleged that Comcast Digital Voice and XFINITY Voice infringe twelve Sprint patents covering various aspects of a telecommunications system. In March 2015, Sprint withdrew its allegations of infringement for two of the patents. In December 2016, the Court granted summary judgment for Comcast with respect to non-infringement of one of the patents and granted summary judgment for Sprint of one of the patents as to infringement, but not as to the patent’s validity, with respect to some but not all of Comcast’s accused telecommunications systems. In January 2017, the Court entered judgment in favor of Comcast on Sprint’s claims for infringement of two of the patents. In March 2017, Sprint indicated that it would not proceed to trial on three of the patents. Trial with respect to the four remaining patents, including the patent for which the Court granted partial summary judgment to Sprint, is set to begin in late October 2017. Sprint seeks approximately $950 million in damages, plus pre-judgment interest. Sprint has further indicated that it may seek to add an allegation that Comcast willfully infringed Sprint’s patents and should be subject to increased damages, which could as much as triple the amount of any damages awarded. We believe the claims in the Sprint lawsuit are without merit and are defending the action vigorously. We cannot predict the outcome of the Sprint lawsuit, estimate a range of possible loss or determine how the final resolution of the action would affect 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, we do not expect the final disposition of the Sprint lawsuit to have a material adverse effect on our consolidated financial position, but it could be material to our consolidated results of operations or cash flows for any one period. We also 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, including the Sprint lawsuit above. In addition, we are 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 results of operations, cash flows or financial position, any litigation resulting from any such legal proceedings or claims could be time-consuming and injure our reputation.

Financial Data by Business Segment

3 Months Ended

Mar. 31, 2017

Segment Reporting Information [Line Items]

Financial Data by Business Segment

We present our operations in five reportable business segments:


•	Cable Communications: Consists of the operations of Comcast Cable, which is one of the nation’s largest providers of video, high-speed Internet, voice, and security and automation services to residential customers under the XFINITY brand; we also provide these and other services to business customers and sell advertising.


•	Cable Networks: Consists primarily of our national cable networks, our regional sports and news networks, our international cable networks, and our cable television studio production operations.


•	Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, the NBC Universo national cable network, and our broadcast television studio production operations.


•	Filmed Entertainment: Consists primarily of the operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide; our films are also produced under the Illumination, Focus Features and DreamWorks Animation names.


•	Theme Parks: Consists primarily of our Universal theme parks in Orlando, Florida; Hollywood, California; and Osaka, Japan.

We use Adjusted EBITDA (formerly operating income before depreciation and amortization) to evaluate the profitability of our operating segments and the components of net income attributable to Comcast Corporation below Adjusted EBITDA are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.



	Three Months Ended March 31, 2017
(in millions)	Revenue^(e)			Adjusted EBITDA^(f)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Communications^(a)	$	12,912		$	5,198		$	1,980	$	3,218		$	1,781	$	352
NBCUniversal
Cable Networks	2,641			1,116			214		902			2		3
Broadcast Television	2,208			322			32		290			29		3
Filmed Entertainment	1,981			368			21		347			10		5
Theme Parks	1,118			397			142		255			229		13
Headquarters and Other^(b)	8			(185		)	99		(284		)	15		31
Eliminations^(c)	(88		)	(1		)	—		(1		)	—		—
NBCUniversal	7,868			2,017			508		1,509			285		55
Corporate and Other^(d)	208			(194		)	14		(208		)	12		9
Eliminations^(c)	(525		)	11			—		11			—		—
Comcast Consolidated	$	20,463		$	7,032		$	2,502	$	4,530		$	2,078	$	416



	Three Months Ended March 31, 2016
(in millions)	Revenue^(e)			Adjusted EBITDA^(f)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Communications^(a)	$	12,204		$	4,889		$	1,843	$	3,046		$	1,576	$	324
NBCUniversal
Cable Networks	2,453			956			190		766			1		1
Broadcast Television	2,084			284			32		252			19		3
Filmed Entertainment	1,383			167			8		159			3		3
Theme Parks	1,026			375			98		277			200		9
Headquarters and Other^(b)	3			(160		)	86		(246		)	72		36
Eliminations^(c)	(88		)	—			—		—			—		—
NBCUniversal	6,861			1,622			414		1,208			295		52
Corporate and Other^(d)	199			(154		)	21		(175		)	14		2
Eliminations^(c)	(474		)	10			—		10			—		—
Comcast Consolidated	$	18,790		$	6,367		$	2,278	$	4,089		$	1,885	$	378


(a)	For the three months ended March 31, 2017 and 2016, Cable Communications segment revenue was derived from the following sources:



	Three Months Ended March 31
	2017		2016
Residential:
Video	44.7	%	45.4	%
High-speed Internet	27.9	%	26.8	%
Voice	6.7	%	7.3	%
Business services	11.5	%	10.7	%
Advertising	4.0	%	4.5	%
Other	5.2	%	5.3	%
Total	100.0	%	100.0	%

Subscription revenue received from customers who purchase bundled services at a discounted rate is allocated proportionally to each cable service based on the individual service’s price on a stand-alone basis.

For the three months ended March 31, 2017 and 2016, 2.8% and 2.9%, respectively, of Cable Communications segment revenue was derived from franchise and other regulatory fees.


(b)	NBCUniversal Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives.


(c)	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 segment generates revenue by selling programming to our Cable Communications segment, which represents a substantial majority of the revenue elimination amount


•	our Broadcast Television segment generates revenue from the fees received under retransmission consent agreements with our Cable Communications segment


•	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 from the licensing of film and television content to our Cable Networks segment


(d)	Corporate and Other activities include costs associated with overhead and personnel, the costs of corporate initiatives and branding, including our new wireless phone service, and the operations of Comcast Spectacor, which owns the Philadelphia Flyers and the Wells Fargo Center arena in Philadelphia, Pennsylvania and operates arena management-related businesses.


(e)	No single customer accounted for a significant amount of revenue in any period.

(f)

We use Adjusted EBITDA as the measure of profit or loss for our operating segments. Adjusted EBITDA is defined as net income attributable to Comcast Corporation before net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock, income tax expense, other income (expense) items, net, and depreciation and amortization, and excluding impairment charges related to fixed and intangible assets and gains or losses on the sale of long-lived assets, if any. Other income (expense) items, net include interest expense, investment income (loss), equity in net income (losses) of investees, and other income (expense), net (as stated in our condensed consolidated statement of income). 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. Additionally, it is unaffected by our capital and tax structures and by our investment activities. We use this measure to evaluate our consolidated operating performance and 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 that of 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), net income (loss) attributable to Comcast Corporation, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP. Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before income taxes is presented in the table below.



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	7,032		$	6,367
Depreciation	(1,915		)	(1,785		)
Amortization	(587		)	(493		)
Other income (expense) items, net	(625		)	(554		)
Income before income taxes	$	3,905		$	3,535

NBCUniversal Media LLC [Member]

Segment Reporting Information [Line Items]

Financial Data by Business Segment

We present our operations in four reportable business segments:


•	Cable Networks: Consists primarily of our national cable networks, our regional sports and news networks, our international cable networks, and our cable television studio production operations.


•	Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, the NBC Universo national cable network, and our broadcast television studio production operations.


•	Filmed Entertainment: Consists primarily of the operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide; our films are also produced under the Illumination, Focus Features and DreamWorks Animation names.


•	Theme Parks: Consists primarily of our Universal theme parks in Orlando, Florida; Hollywood, California; and Osaka, Japan.

We use Adjusted EBITDA (formerly operating income before depreciation and amortization) to evaluate the profitability of our operating segments and the components of net income attributable to NBCUniversal below Adjusted EBITDA are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.



	Three Months Ended March 31, 2017
(in millions)	Revenue^(c)			Adjusted EBITDA^(d)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Networks	$	2,641		$	1,116		$	214	$	902		$	2	$	3
Broadcast Television	2,208			322			32		290			29		3
Filmed Entertainment	1,981			368			21		347			10		5
Theme Parks	1,118			397			142		255			229		13
Headquarters and Other^(a)	8			(185		)	99		(284		)	15		31
Eliminations^(b)	(88		)	(1		)	—		(1		)	—		—
Total	$	7,868		$	2,017		$	508	$	1,509		$	285	$	55



	Three Months Ended March 31, 2016
(in millions)	Revenue^(c)			Adjusted EBITDA^(d)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Networks	$	2,453		$	956		$	190	$	766		$	1	$	1
Broadcast Television	2,084			284			32		252			19		3
Filmed Entertainment	1,383			167			8		159			3		3
Theme Parks	1,026			375			98		277			200		9
Headquarters and Other^(a)	3			(160		)	86		(246		)	72		36
Eliminations^(b)	(88		)	—			—		—			—		—
Total	$	6,861		$	1,622		$	414	$	1,208		$	295	$	52


(a)	Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives.


(b)	Included in Eliminations are transactions that our segments enter into with one another, which consist primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment.


(c)	No single customer accounted for a significant amount of revenue in any period.

(d)

We use Adjusted EBITDA as the measure of profit or loss for our operating segments. Adjusted EBITDA is defined as net income attributable to NBCUniversal before net (income) loss attributable to noncontrolling interests, income tax expense, other income (expense) items, net, and depreciation and amortization, and excluding impairment charges related to fixed and intangible assets and gains or losses on the sale of long-lived assets, if any. Other income (expense) items, net include interest expense, investment income (loss), equity in net income (losses) of investees, and other income (expense), net (as stated in our condensed consolidated statement of income). This measure eliminates the significant level of noncash amortization expense that results from intangible assets recognized in connection with business combinations. Additionally, it is unaffected by our capital and tax structures and by our investment activities. We use this measure to evaluate our consolidated operating performance and 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 that of 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), net income (loss) attributable to NBCUniversal, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP. Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before income taxes is presented in the table below.



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	2,017		$	1,622
Depreciation	(231		)	(192		)
Amortization	(277		)	(222		)
Other income (expense) items, net	(144		)	(28		)
Income before income taxes	$	1,365		$	1,180

- 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 Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8380-108599

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8933-108599

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8844-108599

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Topic 280
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8984-108599

Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 40
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599

Reference 11: 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=68060357&loc=d3e8538-108599

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

+ Details

Condensed Consolidating Financial Information

3 Months Ended

Mar. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Financial Information

Comcast (“Comcast Parent”), Comcast Cable Communications, LLC (“CCCL Parent”), and NBCUniversal (“NBCUniversal Media Parent”) have fully and unconditionally guaranteed each other’s debt securities, including the Comcast revolving credit facility.

Comcast Parent and CCCL Parent also fully and unconditionally guarantee NBCUniversal Enterprise’s $3.3 billion principal amount of senior notes, revolving credit facility and commercial paper program. NBCUniversal Media Parent does not guarantee the NBCUniversal Enterprise senior notes, revolving credit facility or commercial paper program.

Comcast Parent provides an unconditional subordinated guarantee of the $185 million principal amount currently outstanding of Comcast Holdings’ ZONES due October 2029. Neither CCCL Parent nor NBCUniversal Media Parent guarantee the Comcast Holdings’ ZONES due October 2029. None of Comcast Parent, CCCL Parent nor NBCUniversal Media Parent guarantee the $62 million principal amount currently outstanding of Comcast Holdings’ ZONES due November 2029 or the $3.4 billion of Universal Studios Japan term loans.

Condensed Consolidating Balance Sheet

March 31, 2017



(in millions)	Comcast Parent		Comcast Holdings		CCCL Parent		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Assets
Cash and cash equivalents	$	—	$	—	$	—	$	270	$	3,752	$	—		$	4,022
Receivables, net	—		—		—		—		7,525		—			7,525
Programming rights	—		—		—		—		1,479		—			1,479
Other current assets	96		—		—		60		2,063		—			2,219
Total current assets	96		—		—		330		14,819		—			15,245
Film and television costs	—		—		—		—		6,968		—			6,968
Investments	84		—		10		657		5,187		—			5,938
Investments in and amounts due from subsidiaries eliminated upon consolidation	100,103		123,806		120,362		49,537		104,918		(498,726		)	—
Property and equipment, net	364		—		—		—		36,262		—			36,626
Franchise rights	—		—		—		—		59,364		—			59,364
Goodwill	—		—		—		—		36,592		—			36,592
Other intangible assets, net	12		—		—		—		19,002		—			19,014
Other noncurrent assets, net	1,115		666		—		80		1,876		(1,005		)	2,732
Total assets	$	101,774	$	124,472	$	120,372	$	50,604	$	284,988	$	(499,731	)	$	182,479
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	$	17	$	—	$	—	$	—	$	6,641	$	—		$	6,658
Accrued participations and residuals	—		—		—		—		1,811		—			1,811
Accrued expenses and other current liabilities	1,582		—		211		361		4,942		—			7,096
Current portion of long-term debt	1,905		—		550		4		1,050		—			3,509
Total current liabilities	3,504		—		761		365		14,444		—			19,074
Long-term debt, less current portion	40,711		143		2,100		8,204		7,118		—			58,276
Deferred income taxes	—		524		—		69		35,760		(1,005		)	35,348
Other noncurrent liabilities	2,500		—		—		1,103		7,074		—			10,677
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	—		—		—		—		1,456		—			1,456
Equity:
Common stock	56		—		—		—		—		—			56
Other shareholders’ equity	55,003		123,805		117,511		40,863		216,547		(498,726		)	55,003
Total Comcast Corporation shareholders’ equity	55,059		123,805		117,511		40,863		216,547		(498,726		)	55,059
Noncontrolling interests	—		—		—		—		2,589		—			2,589
Total equity	55,059		123,805		117,511		40,863		219,136		(498,726		)	57,648
Total liabilities and equity	$	101,774	$	124,472	$	120,372	$	50,604	$	284,988	$	(499,731	)	$	182,479

Condensed Consolidating Balance Sheet

December 31, 2016



(in millions)	Comcast Parent		Comcast Holdings		CCCL Parent		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Assets
Cash and cash equivalents	$	—	$	—	$	—	$	482	$	2,819	$	—		$	3,301
Receivables, net	—		—		—		—		7,955		—			7,955
Programming rights	—		—		—		—		1,250		—			1,250
Other current assets	151		—		—		36		3,668		—			3,855
Total current assets	151		—		—		518		15,692		—			16,361
Film and television costs	—		—		—		—		7,252		—			7,252
Investments	75		—		—		651		4,521		—			5,247
Investments in and amounts due from subsidiaries eliminated upon consolidation	98,350		120,071		117,696		47,393		97,704		(481,214		)	—
Property and equipment, net	298		—		—		—		35,955		—			36,253
Franchise rights	—		—		—		—		59,364		—			59,364
Goodwill	—		—		—		—		35,980		—			35,980
Other intangible assets, net	13		—		—		—		17,261		—			17,274
Other noncurrent assets, net	1,138		638		—		89		1,921		(1,017		)	2,769
Total assets	$	100,025	$	120,709	$	117,696	$	48,651	$	275,650	$	(482,231	)	$	180,500
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	$	23	$	—	$	—	$	—	$	6,892	$	—		$	6,915
Accrued participations and residuals	—		—		—		—		1,726		—			1,726
Accrued expenses and other current liabilities	1,726		—		341		302		5,045		—			7,414
Current portion of long-term debt	3,739		—		550		4		1,187		—			5,480
Total current liabilities	5,488		—		891		306		14,850		—			21,535
Long-term debt, less current portion	38,123		141		2,100		8,208		6,994		—			55,566
Deferred income taxes	—		542		—		70		35,259		(1,017		)	34,854
Other noncurrent liabilities	2,471		—		—		1,166		7,288		—			10,925
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	—		—		—		—		1,446		—			1,446
Equity:
Common stock	56		—		—		—		—		—			56
Other shareholders’ equity	53,887		120,026		114,705		38,901		207,582		(481,214		)	53,887
Total Comcast Corporation shareholders’ equity	53,943		120,026		114,705		38,901		207,582		(481,214		)	53,943
Noncontrolling interests	—		—		—		—		2,231		—			2,231
Total equity	53,943		120,026		114,705		38,901		209,813		(481,214		)	56,174
Total liabilities and equity	$	100,025	$	120,709	$	117,696	$	48,651	$	275,650	$	(482,231	)	$	180,500

Condensed Consolidating Statement of Income

For the Three Months Ended March 31, 2017



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Revenue:
Service revenue	$	—		$	—		$	—		$	—		$	20,463		$	—		$	20,463
Management fee revenue	275			—			270			—			—			(545		)	—
	275			—			270			—			20,463			(545		)	20,463
Costs and Expenses:
Programming and production	—			—			—			—			6,074			—			6,074
Other operating and administrative	170			—			270			306			5,626			(545		)	5,827
Advertising, marketing and promotion	—			—			—			—			1,530			—			1,530
Depreciation	7			—			—			—			1,908			—			1,915
Amortization	2			—			—			—			585			—			587
	179			—			270			306			15,723			(545		)	15,933
Operating income (loss)	96			—			—			(306		)	4,740			—			4,530
Other Income (Expense):
Interest expense	(517		)	(3		)	(60		)	(112		)	(63		)	—			(755		)
Investment income (loss), net	1			28			—			(4		)	34			—			59
Equity in net income (losses) of investees, net	2,839			2,650			2,320			1,597			1,236			(10,606		)	36
Other income (expense), net	—			—			—			28			7			—			35
	2,323			2,675			2,260			1,509			1,214			(10,606		)	(625		)
Income (loss) before income taxes	2,419			2,675			2,260			1,203			5,954			(10,606		)	3,905
Income tax (expense) benefit	147			(9		)	21			(3		)	(1,414		)	—			(1,258		)
Net income (loss)	2,566			2,666			2,281			1,200			4,540			(10,606		)	2,647
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	—			—			—			—			(81		)	—			(81		)
Net income (loss) attributable to Comcast Corporation	$	2,566		$	2,666		$	2,281		$	1,200		$	4,459		$	(10,606	)	$	2,566
Comprehensive income (loss) attributable to Comcast Corporation	$	2,810		$	2,716		$	2,282		$	1,406		$	4,703		$	(11,107	)	$	2,810

Condensed Consolidating Statement of Income

For the Three Months Ended March 31, 2016



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Revenue:
Service revenue	$	—		$	—		$	—		$	—		$	18,790		$	—		$	18,790
Management fee revenue	259			—			254			—			—			(513		)	—
	259			—			254			—			18,790			(513		)	18,790
Costs and Expenses:
Programming and production	—			—			—			—			5,431			—			5,431
Other operating and administrative	156			—			254			295			5,334			(513		)	5,526
Advertising, marketing and promotion	—			—			—			—			1,466			—			1,466
Depreciation	8			—			—			—			1,777			—			1,785
Amortization	1			—			—			—			492			—			493
	165			—			254			295			14,500			(513		)	14,701
Operating income (loss)	94			—			—			(295		)	4,290			—			4,089
Other Income (Expense):
Interest expense	(451		)	(3		)	(59		)	(117		)	(73		)	—			(703		)
Investment income (loss), net	—			—			—			(2		)	32			—			30
Equity in net income (losses) of investees, net	2,366			2,264			2,114			1,297			991			(9,043		)	(11		)
Other income (expense), net	—			—			—			124			6			—			130
	1,915			2,261			2,055			1,302			956			(9,043		)	(554		)
Income (loss) before income taxes	2,009			2,261			2,055			1,007			5,246			(9,043		)	3,535
Income tax (expense) benefit	125			1			21			(5		)	(1,453		)	—			(1,311		)
Net income (loss)	2,134			2,262			2,076			1,002			3,793			(9,043		)	2,224
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	—			—			—			—			(90		)	—			(90		)
Net income (loss) attributable to Comcast Corporation	$	2,134		$	2,262		$	2,076		$	1,002		$	3,703		$	(9,043	)	$	2,134
Comprehensive income (loss) attributable to Comcast Corporation	$	2,224		$	2,306		$	2,078		$	1,146		$	3,705		$	(9,235	)	$	2,224

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2017



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(453	)	$	(10	)	$	(168	)	$	(330	)	$	6,617		$	—	$	5,656
Investing Activities
Net transactions with affiliates	1,385			10			168			115			(1,678		)	—		—
Capital expenditures	(1		)	—			—			—			(2,077		)	—		(2,078		)
Cash paid for intangible assets	—			—			—			—			(416		)	—		(416		)
Acquisitions and construction of real estate properties	(69		)	—			—			—			(61		)	—		(130		)
Acquisitions, net of cash acquired	—			—			—			—			(216		)	—		(216		)
Proceeds from sales of investments	—			—			—			10			41			—		51
Purchases of investments	(9		)	—			—			(4		)	(1,049		)	—		(1,062		)
Other	55			—			—			—			2			—		57
Net cash provided by (used in) investing activities	1,361			10			168			121			(5,454		)	—		(3,794		)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,739		)	—			—			—			(154		)	—		(1,893		)
Proceeds from borrowings	3,500			—			—			—			—			—		3,500
Repurchases and repayments of debt	(1,000		)	—			—			(3		)	(56		)	—		(1,059		)
Repurchases of common stock under repurchase program and employee plans	(996		)	—			—			—			—			—		(996		)
Dividends paid	(657		)	—			—			—			—			—		(657		)
Issuances of common stock	—			—			—			—			—			—		—
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	—			—			—			—			(72		)	—		(72		)
Other	(16		)	—			—			—			52			—		36
Net cash provided by (used in) financing activities	(908		)	—			—			(3		)	(230		)	—		(1,141		)
Increase (decrease) in cash and cash equivalents	—			—			—			(212		)	933			—		721
Cash and cash equivalents, beginning of period	—			—			—			482			2,819			—		3,301
Cash and cash equivalents, end of period	$	—		$	—		$	—		$	270		$	3,752		$	—	$	4,022

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2016



(in millions)	Comcast Parent			Comcast Holdings		CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(201	)	$	—	$	78		$	(391	)	$	5,913		$	—	$	5,399
Investing Activities
Net transactions with affiliates	(679		)	—		(78		)	63			694			—		—
Capital expenditures	(3		)	—		—			—			(1,882		)	—		(1,885		)
Cash paid for intangible assets	—			—		—			—			(378		)	—		(378		)
Acquisitions and construction of real estate properties	—			—		—			—			(140		)	—		(140		)
Acquisitions, net of cash acquired	—			—		—			—			(24		)	—		(24		)
Proceeds from sales of investments	—			—		—			101			9			—		110
Purchases of investments	(7		)	—		—			—			(441		)	—		(448		)
Other	7			—		—			(5		)	54			—		56
Net cash provided by (used in) investing activities	(682		)	—		(78		)	159			(2,108		)	—		(2,709		)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(400		)	—		—			—			(138		)	—		(538		)
Proceeds from borrowings	3,323			—		—			—			—			—		3,323
Repurchases and repayments of debt	—			—		—			(4		)	(44		)	—		(48		)
Repurchases of common stock under repurchase program and employee plans	(1,427		)	—		—			—			—			—		(1,427		)
Dividends paid	(611		)	—		—			—			—			—		(611		)
Issuances of common stock	12			—		—			—			—			—		12
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	—			—		—			—			(77		)	—		(77		)
Other	(14		)	—		—			—			23			—		9
Net cash provided by (used in) financing activities	883			—		—			(4		)	(236		)	—		643
Increase (decrease) in cash and cash equivalents	—			—		—			(236		)	3,569			—		3,333
Cash and cash equivalents, beginning of period	—			—		—			414			1,881			—		2,295
Cash and cash equivalents, end of period	$	—		$	—	$	—		$	178		$	5,450		$	—	$	5,628

- 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

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Computation of diluted EPS

Computation of Diluted EPS



	Three Months Ended March 31
	2017					2016
(in millions, except per share amounts)	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	$	2,566	4,747	$	0.54	$	2,134	4,868	$	0.44
Effect of dilutive securities:
Assumed exercise or issuance of shares relating to stock plans			85					57
Diluted EPS attributable to Comcast Corporation shareholders	$	2,566	4,832	$	0.53	$	2,134	4,925	$	0.43

Significant Transactions (Tables) - DreamWorks Animation [Member]

3 Months Ended

Mar. 31, 2017

Business Acquisition [Line Items]

Schedule of Business Acquisitions, by Acquisition

The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation.



Preliminary Allocation of Purchase Price
(in millions)
Film and television costs	$	854
Intangible assets	362
Working capital	232
Debt	(381		)
Tax receivable agreement	(146		)
Deferred income taxes	293
Other noncurrent assets and liabilities	114
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interests	(337		)
Goodwill	2,782
Cash consideration transferred	$	3,773

NBCUniversal Media LLC [Member]

Business Acquisition [Line Items]

Schedule of Business Acquisitions, by Acquisition

The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation.



Preliminary Allocation of Purchase Price
(in millions)
Film and television costs	$	854
Intangible assets	362
Working capital	232
Debt	(381		)
Tax receivable agreement^(a)	(146		)
Other noncurrent assets and liabilities and other^(b)	407
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interests	(337		)
Goodwill	2,782
Cash consideration transferred	$	3,773

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2017

NBCUniversal Media LLC [Member]

The following tables present transactions with Comcast and its consolidated subsidiaries that are included in our condensed consolidated financial statements.

Condensed Consolidated Balance Sheet



(in millions)	March 31, 2017		December 31, 2016
Transactions with Comcast and Consolidated Subsidiaries
Receivables, net	$	322	$	285
Accounts payable and accrued expenses related to trade creditors	$	42	$	55
Accrued expenses and other current liabilities	$	19	$	4
Note payable to Comcast	$	1,853	$	2,703
Other noncurrent liabilities	$	389	$	389

Condensed Consolidated Statement of Income



	Three Months Ended March 31
(in millions)	2017			2016
Transactions with Comcast and Consolidated Subsidiaries
Revenue	$	459		$	406
Operating costs and expenses	$	(61	)	$	(60	)
Other income (expense)	$	(19	)	$	(13	)

Film and Television Costs (Tables)

3 Months Ended

Mar. 31, 2017

Film And Television Cost [Line Items]

Film and Television Costs



(in millions)	March 31, 2017		December 31, 2016
Film Costs:
Released, less amortization	$	1,657	$	1,750
Completed, not released	469		50
In production and in development	982		1,310
	3,108		3,110
Television Costs:
Released, less amortization	2,008		1,953
In production and in development	729		853
	2,737		2,806
Programming rights, less amortization	2,602		2,586
	8,447		8,502
Less: Current portion of programming rights	1,479		1,250
Film and television costs	$	6,968	$	7,252

NBCUniversal Media LLC [Member]

Film And Television Cost [Line Items]

Film and Television Costs



(in millions)	March 31, 2017		December 31, 2016
Film Costs:
Released, less amortization	$	1,657	$	1,750
Completed, not released	469		50
In production and in development	982		1,310
	3,108		3,110
Television Costs:
Released, less amortization	2,008		1,953
In production and in development	729		853
	2,737		2,806
Programming rights, less amortization	2,587		2,570
	8,432		8,486
Less: Current portion of programming rights	1,471		1,241
Film and television costs	$	6,961	$	7,245

Investments (Tables)

3 Months Ended

Mar. 31, 2017

Fair Value, Equity And Cost Method Investments [Line Items]

Investment Summary



(in millions)	March 31, 2017		December 31, 2016
Fair Value Method:
Snap	$	662	$	—
Other	161		198
	823		198
Equity Method:
Atairos	1,624		1,601
Hulu	171		225
Other	631		550
	2,426		2,376
Cost Method:
AirTouch	1,602		1,599
BuzzFeed	400		400
Other	698		771
	2,700		2,770
Total investments	5,949		5,344
Less: Current investments	11		97
Noncurrent investments	$	5,938	$	5,247

Investment Income (Loss), Net



	Three Months Ended March 31
(in millions)	2017			2016
Gains (losses) on sales and exchanges of investments, net	$	(1	)	$	2
Investment impairment losses	(4		)	(20		)
Interest and dividend income	33			29
Other, net	31			19
Investment income (loss), net	$	59		$	30

NBCUniversal Media LLC [Member]

Fair Value, Equity And Cost Method Investments [Line Items]

Investment Summary



(in millions)	March 31, 2017		December 31, 2016
Fair Value Method:
Snap	$	662	$	—
Other	7		6
	669		6
Equity Method:
Hulu	171		225
Other	400		336
	571		561
Cost Method:
BuzzFeed	400		400
Other	300		296
	700		696
Total investments	$	1,940	$	1,263

Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of recognized share-based compensation expense

Recognized Share-Based Compensation Expense



	Three Months Ended March 31
(in millions)	2017		2016
Restricted share units	$	74	$	70
Stock options	40		37
Employee stock purchase plans	10		8
Total	$	124	$	115

NBCUniversal Media LLC [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of recognized share-based compensation expense

Recognized Share-Based Compensation Expense



	Three Months Ended March 31
(in millions)	2017		2016
Restricted share units	$	20	$	18
Stock options	2		2
Employee stock purchase plans	3		3
Total	$	25	$	23

Supplemental Financial Information (Tables)

3 Months Ended

Mar. 31, 2017

Supplemental Financial Information [Line Items]

Schedule of receivables, net

Receivables



(in millions)	March 31, 2017		December 31, 2016
Receivables, gross	$	8,111	$	8,622
Less: Allowance for returns and customer incentives	347		417
Less: Allowance for doubtful accounts	239		250
Receivables, net	$	7,525	$	7,955

Schedule of accumulated other comprehensive income (loss)

Accumulated Other Comprehensive Income (Loss)



(in millions)	March 31, 2017			March 31, 2016
Unrealized gains (losses) on marketable securities	$	104		$	2
Deferred gains (losses) on cash flow hedges	(7		)	(60		)
Unrecognized gains (losses) on employee benefit obligations	282			8
Cumulative translation adjustments	(37		)	(34		)
Accumulated other comprehensive income (loss), net of deferred taxes	$	342		$	(84	)

Schedule of adjustments to reconcile net income to net cash provided by operating activities

Net Cash Provided by Operating Activities



	Three Months Ended March 31
(in millions)	2017			2016
Net income	$	2,647		$	2,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,502			2,278
Share-based compensation	173			153
Noncash interest expense (income), net	58			55
Equity in net (income) losses of investees, net	(36		)	11
Cash received from investees	17			16
Net (gain) loss on investment activity and other	(53		)	(126		)
Deferred income taxes	265			217
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	465			562
Film and television costs, net	46			(80		)
Accounts payable and accrued expenses related to trade creditors	(190		)	12
Other operating assets and liabilities	(238		)	77
Net cash provided by operating activities	$	5,656		$	5,399

Schedule of cash payments for interest and income taxes

Cash Payments for Interest and Income Taxes



	Three Months Ended March 31
(in millions)	2017		2016
Interest	$	895	$	723
Income taxes	$	132	$	190

NBCUniversal Media LLC [Member]

Supplemental Financial Information [Line Items]

Schedule of receivables, net

Receivables



(in millions)	March 31, 2017		December 31, 2016
Receivables, gross	$	6,647	$	6,799
Less: Allowance for returns and customer incentives	343		413
Less: Allowance for doubtful accounts	77		84
Receivables, net	$	6,227	$	6,302

Schedule of accumulated other comprehensive income (loss)

Accumulated Other Comprehensive Income (Loss)



(in millions)	March 31, 2017			March 31, 2016
Unrealized gains (losses) on marketable securities	$	1		$	—
Deferred gains (losses) on cash flow hedges	9			(19		)
Unrecognized gains (losses) on employee benefit obligations	120			3
Cumulative translation adjustments	(59		)	(52		)
Accumulated other comprehensive income (loss)	$	71		$	(68	)

Schedule of adjustments to reconcile net income to net cash provided by operating activities

Net Cash Provided by Operating Activities



	Three Months Ended March 31
(in millions)	2017			2016
Net income	$	1,273		$	1,082
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	508			414
Equity in net (income) losses of investees, net	26			2
Cash received from investees	14			12
Net (gain) loss on investment activity and other	(18		)	(114		)
Deferred income taxes	9			48
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	104			349
Film and television costs, net	46			(84		)
Accounts payable and accrued expenses related to trade creditors	(190		)	(139		)
Other operating assets and liabilities	(295		)	(393		)
Net cash provided by operating activities	$	1,477		$	1,177

Schedule of cash payments for interest and income taxes

Cash Payments for Interest and Income Taxes

Financial Data by Business Segment (Tables)

3 Months Ended

Mar. 31, 2017

Segment Reporting Information [Line Items]

Financial Data by Business Segment



	Three Months Ended March 31, 2017
(in millions)	Revenue^(e)			Adjusted EBITDA^(f)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Communications^(a)	$	12,912		$	5,198		$	1,980	$	3,218		$	1,781	$	352
NBCUniversal
Cable Networks	2,641			1,116			214		902			2		3
Broadcast Television	2,208			322			32		290			29		3
Filmed Entertainment	1,981			368			21		347			10		5
Theme Parks	1,118			397			142		255			229		13
Headquarters and Other^(b)	8			(185		)	99		(284		)	15		31
Eliminations^(c)	(88		)	(1		)	—		(1		)	—		—
NBCUniversal	7,868			2,017			508		1,509			285		55
Corporate and Other^(d)	208			(194		)	14		(208		)	12		9
Eliminations^(c)	(525		)	11			—		11			—		—
Comcast Consolidated	$	20,463		$	7,032		$	2,502	$	4,530		$	2,078	$	416



	Three Months Ended March 31, 2016
(in millions)	Revenue^(e)			Adjusted EBITDA^(f)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Communications^(a)	$	12,204		$	4,889		$	1,843	$	3,046		$	1,576	$	324
NBCUniversal
Cable Networks	2,453			956			190		766			1		1
Broadcast Television	2,084			284			32		252			19		3
Filmed Entertainment	1,383			167			8		159			3		3
Theme Parks	1,026			375			98		277			200		9
Headquarters and Other^(b)	3			(160		)	86		(246		)	72		36
Eliminations^(c)	(88		)	—			—		—			—		—
NBCUniversal	6,861			1,622			414		1,208			295		52
Corporate and Other^(d)	199			(154		)	21		(175		)	14		2
Eliminations^(c)	(474		)	10			—		10			—		—
Comcast Consolidated	$	18,790		$	6,367		$	2,278	$	4,089		$	1,885	$	378


(a)	For the three months ended March 31, 2017 and 2016, Cable Communications segment revenue was derived from the following sources:



	Three Months Ended March 31
	2017		2016
Residential:
Video	44.7	%	45.4	%
High-speed Internet	27.9	%	26.8	%
Voice	6.7	%	7.3	%
Business services	11.5	%	10.7	%
Advertising	4.0	%	4.5	%
Other	5.2	%	5.3	%
Total	100.0	%	100.0	%

For the three months ended March 31, 2017 and 2016, 2.8% and 2.9%, respectively, of Cable Communications segment revenue was derived from franchise and other regulatory fees.


(b)	NBCUniversal Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives.


(c)	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 segment generates revenue by selling programming to our Cable Communications segment, which represents a substantial majority of the revenue elimination amount


•	our Broadcast Television segment generates revenue from the fees received under retransmission consent agreements with our Cable Communications segment


•	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 from the licensing of film and television content to our Cable Networks segment


(d)	Corporate and Other activities include costs associated with overhead and personnel, the costs of corporate initiatives and branding, including our new wireless phone service, and the operations of Comcast Spectacor, which owns the Philadelphia Flyers and the Wells Fargo Center arena in Philadelphia, Pennsylvania and operates arena management-related businesses.


(e)	No single customer accounted for a significant amount of revenue in any period.

(f)



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	7,032		$	6,367
Depreciation	(1,915		)	(1,785		)
Amortization	(587		)	(493		)
Other income (expense) items, net	(625		)	(554		)
Income before income taxes	$	3,905		$	3,535

Cable Communications Segment Revenue Sources



	Three Months Ended March 31
	2017		2016
Residential:
Video	44.7	%	45.4	%
High-speed Internet	27.9	%	26.8	%
Voice	6.7	%	7.3	%
Business services	11.5	%	10.7	%
Advertising	4.0	%	4.5	%
Other	5.2	%	5.3	%
Total	100.0	%	100.0	%

Reconciliation of Adjusted EBITDA from Segments to Consolidated

Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before income taxes is presented in the table below.



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	7,032		$	6,367
Depreciation	(1,915		)	(1,785		)
Amortization	(587		)	(493		)
Other income (expense) items, net	(625		)	(554		)
Income before income taxes	$	3,905		$	3,535

NBCUniversal Media LLC [Member]

Segment Reporting Information [Line Items]

Financial Data by Business Segment



	Three Months Ended March 31, 2017
(in millions)	Revenue^(c)			Adjusted EBITDA^(d)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Networks	$	2,641		$	1,116		$	214	$	902		$	2	$	3
Broadcast Television	2,208			322			32		290			29		3
Filmed Entertainment	1,981			368			21		347			10		5
Theme Parks	1,118			397			142		255			229		13
Headquarters and Other^(a)	8			(185		)	99		(284		)	15		31
Eliminations^(b)	(88		)	(1		)	—		(1		)	—		—
Total	$	7,868		$	2,017		$	508	$	1,509		$	285	$	55



	Three Months Ended March 31, 2016
(in millions)	Revenue^(c)			Adjusted EBITDA^(d)			Depreciation and Amortization		Operating Income (Loss)			Capital Expenditures		Cash Paid for Intangible Assets
Cable Networks	$	2,453		$	956		$	190	$	766		$	1	$	1
Broadcast Television	2,084			284			32		252			19		3
Filmed Entertainment	1,383			167			8		159			3		3
Theme Parks	1,026			375			98		277			200		9
Headquarters and Other^(a)	3			(160		)	86		(246		)	72		36
Eliminations^(b)	(88		)	—			—		—			—		—
Total	$	6,861		$	1,622		$	414	$	1,208		$	295	$	52


(a)	Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives.


(b)	Included in Eliminations are transactions that our segments enter into with one another, which consist primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment.


(c)	No single customer accounted for a significant amount of revenue in any period.

(d)



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	2,017		$	1,622
Depreciation	(231		)	(192		)
Amortization	(277		)	(222		)
Other income (expense) items, net	(144		)	(28		)
Income before income taxes	$	1,365		$	1,180

Reconciliation of Adjusted EBITDA from Segments to Consolidated

Our reconciliation of the aggregate amount of Adjusted EBITDA for our reportable segments to consolidated income before income taxes is presented in the table below.



	Three Months Ended March 31
(in millions)	2017			2016
Adjusted EBITDA	$	2,017		$	1,622
Depreciation	(231		)	(192		)
Amortization	(277		)	(222		)
Other income (expense) items, net	(144		)	(28		)
Income before income taxes	$	1,365		$	1,180

Condensed Consolidating Financial Information (Tables)

3 Months Ended

Mar. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Financial Statements

Condensed Consolidating Balance Sheet

March 31, 2017



(in millions)	Comcast Parent		Comcast Holdings		CCCL Parent		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Assets
Cash and cash equivalents	$	—	$	—	$	—	$	270	$	3,752	$	—		$	4,022
Receivables, net	—		—		—		—		7,525		—			7,525
Programming rights	—		—		—		—		1,479		—			1,479
Other current assets	96		—		—		60		2,063		—			2,219
Total current assets	96		—		—		330		14,819		—			15,245
Film and television costs	—		—		—		—		6,968		—			6,968
Investments	84		—		10		657		5,187		—			5,938
Investments in and amounts due from subsidiaries eliminated upon consolidation	100,103		123,806		120,362		49,537		104,918		(498,726		)	—
Property and equipment, net	364		—		—		—		36,262		—			36,626
Franchise rights	—		—		—		—		59,364		—			59,364
Goodwill	—		—		—		—		36,592		—			36,592
Other intangible assets, net	12		—		—		—		19,002		—			19,014
Other noncurrent assets, net	1,115		666		—		80		1,876		(1,005		)	2,732
Total assets	$	101,774	$	124,472	$	120,372	$	50,604	$	284,988	$	(499,731	)	$	182,479
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	$	17	$	—	$	—	$	—	$	6,641	$	—		$	6,658
Accrued participations and residuals	—		—		—		—		1,811		—			1,811
Accrued expenses and other current liabilities	1,582		—		211		361		4,942		—			7,096
Current portion of long-term debt	1,905		—		550		4		1,050		—			3,509
Total current liabilities	3,504		—		761		365		14,444		—			19,074
Long-term debt, less current portion	40,711		143		2,100		8,204		7,118		—			58,276
Deferred income taxes	—		524		—		69		35,760		(1,005		)	35,348
Other noncurrent liabilities	2,500		—		—		1,103		7,074		—			10,677
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	—		—		—		—		1,456		—			1,456
Equity:
Common stock	56		—		—		—		—		—			56
Other shareholders’ equity	55,003		123,805		117,511		40,863		216,547		(498,726		)	55,003
Total Comcast Corporation shareholders’ equity	55,059		123,805		117,511		40,863		216,547		(498,726		)	55,059
Noncontrolling interests	—		—		—		—		2,589		—			2,589
Total equity	55,059		123,805		117,511		40,863		219,136		(498,726		)	57,648
Total liabilities and equity	$	101,774	$	124,472	$	120,372	$	50,604	$	284,988	$	(499,731	)	$	182,479

Condensed Consolidating Balance Sheet

December 31, 2016



(in millions)	Comcast Parent		Comcast Holdings		CCCL Parent		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Assets
Cash and cash equivalents	$	—	$	—	$	—	$	482	$	2,819	$	—		$	3,301
Receivables, net	—		—		—		—		7,955		—			7,955
Programming rights	—		—		—		—		1,250		—			1,250
Other current assets	151		—		—		36		3,668		—			3,855
Total current assets	151		—		—		518		15,692		—			16,361
Film and television costs	—		—		—		—		7,252		—			7,252
Investments	75		—		—		651		4,521		—			5,247
Investments in and amounts due from subsidiaries eliminated upon consolidation	98,350		120,071		117,696		47,393		97,704		(481,214		)	—
Property and equipment, net	298		—		—		—		35,955		—			36,253
Franchise rights	—		—		—		—		59,364		—			59,364
Goodwill	—		—		—		—		35,980		—			35,980
Other intangible assets, net	13		—		—		—		17,261		—			17,274
Other noncurrent assets, net	1,138		638		—		89		1,921		(1,017		)	2,769
Total assets	$	100,025	$	120,709	$	117,696	$	48,651	$	275,650	$	(482,231	)	$	180,500
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	$	23	$	—	$	—	$	—	$	6,892	$	—		$	6,915
Accrued participations and residuals	—		—		—		—		1,726		—			1,726
Accrued expenses and other current liabilities	1,726		—		341		302		5,045		—			7,414
Current portion of long-term debt	3,739		—		550		4		1,187		—			5,480
Total current liabilities	5,488		—		891		306		14,850		—			21,535
Long-term debt, less current portion	38,123		141		2,100		8,208		6,994		—			55,566
Deferred income taxes	—		542		—		70		35,259		(1,017		)	34,854
Other noncurrent liabilities	2,471		—		—		1,166		7,288		—			10,925
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	—		—		—		—		1,446		—			1,446
Equity:
Common stock	56		—		—		—		—		—			56
Other shareholders’ equity	53,887		120,026		114,705		38,901		207,582		(481,214		)	53,887
Total Comcast Corporation shareholders’ equity	53,943		120,026		114,705		38,901		207,582		(481,214		)	53,943
Noncontrolling interests	—		—		—		—		2,231		—			2,231
Total equity	53,943		120,026		114,705		38,901		209,813		(481,214		)	56,174
Total liabilities and equity	$	100,025	$	120,709	$	117,696	$	48,651	$	275,650	$	(482,231	)	$	180,500

Condensed Consolidating Statement of Income

For the Three Months Ended March 31, 2017



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Revenue:
Service revenue	$	—		$	—		$	—		$	—		$	20,463		$	—		$	20,463
Management fee revenue	275			—			270			—			—			(545		)	—
	275			—			270			—			20,463			(545		)	20,463
Costs and Expenses:
Programming and production	—			—			—			—			6,074			—			6,074
Other operating and administrative	170			—			270			306			5,626			(545		)	5,827
Advertising, marketing and promotion	—			—			—			—			1,530			—			1,530
Depreciation	7			—			—			—			1,908			—			1,915
Amortization	2			—			—			—			585			—			587
	179			—			270			306			15,723			(545		)	15,933
Operating income (loss)	96			—			—			(306		)	4,740			—			4,530
Other Income (Expense):
Interest expense	(517		)	(3		)	(60		)	(112		)	(63		)	—			(755		)
Investment income (loss), net	1			28			—			(4		)	34			—			59
Equity in net income (losses) of investees, net	2,839			2,650			2,320			1,597			1,236			(10,606		)	36
Other income (expense), net	—			—			—			28			7			—			35
	2,323			2,675			2,260			1,509			1,214			(10,606		)	(625		)
Income (loss) before income taxes	2,419			2,675			2,260			1,203			5,954			(10,606		)	3,905
Income tax (expense) benefit	147			(9		)	21			(3		)	(1,414		)	—			(1,258		)
Net income (loss)	2,566			2,666			2,281			1,200			4,540			(10,606		)	2,647
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	—			—			—			—			(81		)	—			(81		)
Net income (loss) attributable to Comcast Corporation	$	2,566		$	2,666		$	2,281		$	1,200		$	4,459		$	(10,606	)	$	2,566
Comprehensive income (loss) attributable to Comcast Corporation	$	2,810		$	2,716		$	2,282		$	1,406		$	4,703		$	(11,107	)	$	2,810

Condensed Consolidating Statement of Income

For the Three Months Ended March 31, 2016



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments			Consolidated Comcast Corporation
Revenue:
Service revenue	$	—		$	—		$	—		$	—		$	18,790		$	—		$	18,790
Management fee revenue	259			—			254			—			—			(513		)	—
	259			—			254			—			18,790			(513		)	18,790
Costs and Expenses:
Programming and production	—			—			—			—			5,431			—			5,431
Other operating and administrative	156			—			254			295			5,334			(513		)	5,526
Advertising, marketing and promotion	—			—			—			—			1,466			—			1,466
Depreciation	8			—			—			—			1,777			—			1,785
Amortization	1			—			—			—			492			—			493
	165			—			254			295			14,500			(513		)	14,701
Operating income (loss)	94			—			—			(295		)	4,290			—			4,089
Other Income (Expense):
Interest expense	(451		)	(3		)	(59		)	(117		)	(73		)	—			(703		)
Investment income (loss), net	—			—			—			(2		)	32			—			30
Equity in net income (losses) of investees, net	2,366			2,264			2,114			1,297			991			(9,043		)	(11		)
Other income (expense), net	—			—			—			124			6			—			130
	1,915			2,261			2,055			1,302			956			(9,043		)	(554		)
Income (loss) before income taxes	2,009			2,261			2,055			1,007			5,246			(9,043		)	3,535
Income tax (expense) benefit	125			1			21			(5		)	(1,453		)	—			(1,311		)
Net income (loss)	2,134			2,262			2,076			1,002			3,793			(9,043		)	2,224
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	—			—			—			—			(90		)	—			(90		)
Net income (loss) attributable to Comcast Corporation	$	2,134		$	2,262		$	2,076		$	1,002		$	3,703		$	(9,043	)	$	2,134
Comprehensive income (loss) attributable to Comcast Corporation	$	2,224		$	2,306		$	2,078		$	1,146		$	3,705		$	(9,235	)	$	2,224

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2017



(in millions)	Comcast Parent			Comcast Holdings			CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(453	)	$	(10	)	$	(168	)	$	(330	)	$	6,617		$	—	$	5,656
Investing Activities
Net transactions with affiliates	1,385			10			168			115			(1,678		)	—		—
Capital expenditures	(1		)	—			—			—			(2,077		)	—		(2,078		)
Cash paid for intangible assets	—			—			—			—			(416		)	—		(416		)
Acquisitions and construction of real estate properties	(69		)	—			—			—			(61		)	—		(130		)
Acquisitions, net of cash acquired	—			—			—			—			(216		)	—		(216		)
Proceeds from sales of investments	—			—			—			10			41			—		51
Purchases of investments	(9		)	—			—			(4		)	(1,049		)	—		(1,062		)
Other	55			—			—			—			2			—		57
Net cash provided by (used in) investing activities	1,361			10			168			121			(5,454		)	—		(3,794		)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,739		)	—			—			—			(154		)	—		(1,893		)
Proceeds from borrowings	3,500			—			—			—			—			—		3,500
Repurchases and repayments of debt	(1,000		)	—			—			(3		)	(56		)	—		(1,059		)
Repurchases of common stock under repurchase program and employee plans	(996		)	—			—			—			—			—		(996		)
Dividends paid	(657		)	—			—			—			—			—		(657		)
Issuances of common stock	—			—			—			—			—			—		—
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	—			—			—			—			(72		)	—		(72		)
Other	(16		)	—			—			—			52			—		36
Net cash provided by (used in) financing activities	(908		)	—			—			(3		)	(230		)	—		(1,141		)
Increase (decrease) in cash and cash equivalents	—			—			—			(212		)	933			—		721
Cash and cash equivalents, beginning of period	—			—			—			482			2,819			—		3,301
Cash and cash equivalents, end of period	$	—		$	—		$	—		$	270		$	3,752		$	—	$	4,022

Condensed Consolidating Statement of Cash Flows

For the Three Months Ended March 31, 2016



(in millions)	Comcast Parent			Comcast Holdings		CCCL Parent			NBCUniversal Media Parent			Non- Guarantor Subsidiaries			Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities	$	(201	)	$	—	$	78		$	(391	)	$	5,913		$	—	$	5,399
Investing Activities
Net transactions with affiliates	(679		)	—		(78		)	63			694			—		—
Capital expenditures	(3		)	—		—			—			(1,882		)	—		(1,885		)
Cash paid for intangible assets	—			—		—			—			(378		)	—		(378		)
Acquisitions and construction of real estate properties	—			—		—			—			(140		)	—		(140		)
Acquisitions, net of cash acquired	—			—		—			—			(24		)	—		(24		)
Proceeds from sales of investments	—			—		—			101			9			—		110
Purchases of investments	(7		)	—		—			—			(441		)	—		(448		)
Other	7			—		—			(5		)	54			—		56
Net cash provided by (used in) investing activities	(682		)	—		(78		)	159			(2,108		)	—		(2,709		)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(400		)	—		—			—			(138		)	—		(538		)
Proceeds from borrowings	3,323			—		—			—			—			—		3,323
Repurchases and repayments of debt	—			—		—			(4		)	(44		)	—		(48		)
Repurchases of common stock under repurchase program and employee plans	(1,427		)	—		—			—			—			—		(1,427		)
Dividends paid	(611		)	—		—			—			—			—		(611		)
Issuances of common stock	12			—		—			—			—			—		12
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	—			—		—			—			(77		)	—		(77		)
Other	(14		)	—		—			—			23			—		9
Net cash provided by (used in) financing activities	883			—		—			(4		)	(236		)	—		643
Increase (decrease) in cash and cash equivalents	—			—		—			(236		)	3,569			—		3,333
Cash and cash equivalents, beginning of period	—			—		—			414			1,881			—		2,295
Cash and cash equivalents, end of period	$	—		$	—	$	—		$	178		$	5,450		$	—	$	5,628

Condensed Consolidated Financial Statements (Details)	Jan. 24, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 5,656	$ 5,399
Net cash provided by (used in) financing activities	(1,141)	643
Financial Assets and Financial Liabilities New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement impact on net income if adopted	104
Share Based Compensation New Accounting Pronouncement [Member] \| Effect of Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in income tax expense	$ 139
Increase in diluted earnings per share (in dollars per share)	$ 0.03
Net cash provided by operating activities	$ 385	289
Net cash provided by (used in) financing activities	$ (385)	$ (289)

- Definition

Amount of the effect of a change in accounting principle on diluted earnings per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=66092750

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794

Reference 5: 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=64863997&loc=d3e1252-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256

+ Details

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to parent	$ 2,566	$ 2,134
Basic EPS attributable to Comcast Corporation shareholders (in shares)	4,747	4,868
Assumed exercise or issuance of shares relating to stock plans (in shares)	85	57
Diluted EPS attributable to Comcast Corporation shareholders (in shares)	4,832	4,925
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.54	$ 0.44
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.53	$ 0.43

Significant Transactions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Apr. 06, 2017	Aug. 22, 2016	Mar. 31, 2017
DreamWorks Animation [Member]
Business Acquisition [Line Items]
Cash consideration transferred		$ 3,773
Business acquisition, price paid per share (in dollars per share)		$ 41
Universal Studios Japan [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest	$ 2,300
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Contribution from member			$ 662
NBCUniversal Media LLC [Member] \| DreamWorks Animation [Member]
Business Acquisition [Line Items]
Cash consideration transferred		$ 3,773
NBCUniversal Media LLC [Member] \| DreamWorks Animation [Member] \| Member's contribution that represented Deferred Income Tax Assets and Other Tax-related Items recorded by Parent but excluded from net assets contributed [Member]
Business Acquisition [Line Items]
Contribution from member		281
NBCUniversal Media LLC [Member] \| DreamWorks Animation [Member] \| Tax Receivable Agreement [Member]
Business Acquisition [Line Items]
Contribution from member		146
NBCUniversal Media LLC [Member] \| DreamWorks Animation [Member] \| Cash Consideration Transferred By Comcast [Member]
Business Acquisition [Line Items]
Cash consideration transferred		$ 3,773
Business acquisition, price paid per share (in dollars per share)		$ 41
NBCUniversal Media LLC [Member] \| Universal Studios Japan [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest	$ 2,300

Significant Transactions (Preliminary Allocation of Purchase Price) (Details) - USD ($) $ in Millions	Aug. 22, 2016	Mar. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 36,592	$ 35,980
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Goodwill		$ 23,793	$ 23,323
DreamWorks Animation [Member]
Business Acquisition [Line Items]
Film and television costs	$ 854
Intangible assets	362
Working capital	232
Debt	(381)
Tax receivable agreement	(146)
Deferred income taxes	293
Other noncurrent assets and liabilities and other	114
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interest	(337)
Goodwill	2,782
Cash consideration transferred by Comcast	3,773
DreamWorks Animation [Member] \| NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Film and television costs	854
Intangible assets	362
Working capital	232
Debt	(381)
Tax receivable agreement	(146)
Other noncurrent assets and liabilities and other	407
Identifiable net assets (liabilities) acquired	1,328
Noncontrolling interest	(337)
Goodwill	2,782
Cash consideration transferred by Comcast	$ 3,773

Significant Transactions Schedule of FCC Spectrum Auction (Details) - Subsequent Event [Member] - FCC Spectrum Auction [Member] $ in Millions	Apr. 13, 2017 USD ($)
FCC Spectrum Auction [Line Items]
Expected Proceeds From Spectrum Auction	$ 482
Assets Held-for-sale, Not Part of Disposal Group, Current, Other	144
Amount to acquire broadcast spectrum	1,700
Deposit To Acquire Intangible Asset	1,800
NBCUniversal Media LLC [Member]
FCC Spectrum Auction [Line Items]
Expected Proceeds From Spectrum Auction	482
Assets Held-for-sale, Not Part of Disposal Group, Current, Other	$ 144

Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Other noncurrent liabilities	$ 10,677	$ 10,925
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Other noncurrent liabilities	4,039	$ 4,130
NBCUniversal Media LLC [Member] \| Carrying Value Of Related Party Contractual Obligation [Member]
Related Party Transaction [Line Items]
Other noncurrent liabilities	$ 383

Related Party Transactions (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Receivables, net	$ 7,525	$ 7,955
Accounts payable and accrued expenses related to trade creditors	6,658	6,915
Accrued expenses and other current liabilities	5,862	6,282
Other noncurrent liabilities	10,677	10,925
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	6,227	6,302
Accounts payable and accrued expenses related to trade creditors	1,487	1,647
Accrued expenses and other current liabilities	1,573	1,888
Note payable to Comcast	1,853	2,703
Other noncurrent liabilities	4,039	4,130
Comcast And Consolidated Subsidiaries [Member] \| NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	322	285
Accounts payable and accrued expenses related to trade creditors	42	55
Accrued expenses and other current liabilities	19	4
Note payable to Comcast	1,853	2,703
Other noncurrent liabilities	$ 389	$ 389

Related Party Transactions (Condensed Consolidated Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Related Party Transaction [Line Items]
Revenue	$ 20,463	$ 18,790
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue	7,868	6,861
Comcast And Consolidated Subsidiaries [Member] \| NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue	459	406
Operating costs and expenses	(61)	(60)
Other income (expense)	$ (19)	$ (13)

Film and Television Costs (Film and Television Costs)(Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Film Costs:
Released, less amortization	$ 1,657	$ 1,750
Completed, not released	469	50
In production and in development	982	1,310
Total film costs	3,108	3,110
Television Costs:
Released, less amortization	2,008	1,953
In production and in development	729	853
Total television costs	2,737	2,806
Programming rights, less amortization	2,602	2,586
Total film costs, television costs and programming rights	8,447	8,502
Less: Current portion of programming rights	1,479	1,250
Film and television costs	6,968	7,252
NBCUniversal Media LLC [Member]
Film Costs:
Released, less amortization	1,657	1,750
Completed, not released	469	50
In production and in development	982	1,310
Total film costs	3,108	3,110
Television Costs:
Released, less amortization	2,008	1,953
In production and in development	729	853
Total television costs	2,737	2,806
Programming rights, less amortization	2,587	2,570
Total film costs, television costs and programming rights	8,432	8,486
Less: Current portion of programming rights	1,471	1,241
Film and television costs	$ 6,961	$ 7,245

Investments (Schedule of Investments) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	$ 823	$ 198
Equity method	2,426	2,376
Cost method	2,700	2,770
Total Investments	5,949	5,344
Less: Current investments	11	97
Noncurrent Investments	5,938	5,247
Snap [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	662	0
Other Fair Value Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	161	198
Atairos [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	1,624	1,601
Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	171	225
Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	631	550
AirTouch [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	1,602	1,599
BuzzFeed [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	400	400
Other Cost Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	698	771
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	669	6
Equity method	571	561
Cost method	700	696
Total Investments	1,940	1,263
Noncurrent Investments	1,940	1,263
NBCUniversal Media LLC [Member] \| Snap [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	662	0
NBCUniversal Media LLC [Member] \| Other Fair Value Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	7	6
NBCUniversal Media LLC [Member] \| Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	171	225
NBCUniversal Media LLC [Member] \| Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	400	336
NBCUniversal Media LLC [Member] \| BuzzFeed [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	400	400
NBCUniversal Media LLC [Member] \| Other Cost Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	$ 300	$ 296

Investments (Investment Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Gains (losses) on sales and exchanges of investments, net	$ (1)	$ 2
Investment impairment losses	(4)	(20)
Interest and dividend income	33	29
Other, net	31	19
Investment income (loss), net	$ 59	$ 30

Investments (Fair Value Method Investments) (Details) $ in Millions	1 Months Ended
	Mar. 31, 2017 USD ($)
Snap [Member]
Schedule of Fair Value Method Investments [Line Items]
Payments to acquire available-for-sale securities	$ 500

Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity in net income (losses) of investees		$ 36	$ (11)
Atairos [Member]
Schedule of Equity Method Investments [Line Items]
Purchases of investments		457
Equity in net income (losses) of investees		57	(15)
The Weather Channel [Member]
Schedule of Equity Method Investments [Line Items]
Pretax gain on sale of investment	$ 108
NBCUniversal Media LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net income (losses) of investees		$ (26)	$ (2)
NBCUniversal Media LLC [Member] \| The Weather Channel [Member]
Schedule of Equity Method Investments [Line Items]
Pretax gain on sale of investment	$ 108

Investments (Cost Method Investments) (Details) $ in Billions	3 Months Ended
	Mar. 31, 2017 USD ($) preferred_stock_series
AirTouch [Member]
Schedule of Cost-method Investments [Line Items]
Number of Preferred Stock Series \| preferred_stock_series	2
Level 2 [Member] \| AirTouch [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value Of Cost Method Investment Redeemable Preferred Shares	$ 1.8
AirTouch [Member] \| Level 2 [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of redeemable preferred shares	$ 1.8

Long-Term Debt (Narrative) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Total debt	$ 61,800
Fair value of debt	66,700
Amounts available under revolving credit facilities	7,400
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Total debt	11,700
Fair value of debt	$ 12,600
Ownership in cable holding company subsidiaries	100.00%
NBCUniversal Enterprise [Member] \| NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Related party aggregate principal amount senior notes not subject to guarantee	$ 3,300
Related party credit facility not subject to guarantee	1,500
Related party liquidation preference preferred stock not subject to guarantee	725
Comcast Revolving Credit Facility [Member] \| NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	7,000
Comcast and CCCL Parent Debt Securities [Member] \| NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	45,500
NBCUniversal Enterprise Credit Facility [Member]
Debt Instrument [Line Items]
Amounts available under revolving credit facilities	585
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper	0
NBCUniversal Enterprise Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper	915
Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Non Guarantee Obligations Current Principal Balance	3,400
Universal Studios Japan Term Loans [Member] \| NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Non Guarantee Obligations Current Principal Balance	$ 3,400

Long-Term Debt (Debt Borrowings)(Details) - USD ($) $ in Millions	Mar. 31, 2017	Jan. 31, 2017
Senior 4.45% Notes Due 2047 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,005
Interest rate	4.45%
Senior 3.0% Notes Due 2024 [Member]
Debt Instrument [Line Items]
Debt face amount		$ 1,250
Interest rate		3.00%
Senior 3.3% Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt face amount		$ 1,250
Interest rate		3.30%

Long-term Debt (Debt Repayments) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 1,059	$ 48
Senior 6.50% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt	$ 1,000
Interest rate	6.50%

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 124	$ 115
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	25	23
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	74	70
Restricted Stock Units (RSUs) [Member] \| NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	20	18
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	40	37
Stock Options [Member] \| NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	2	2
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	10	8
Employee Stock Purchase Plans [Member] \| NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 3	$ 3

Share-Based Compensation (Narrative) (Details) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards \| $	$ 1,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards \| $	$ 569
Management Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted (in shares) \| shares	39.1
Weighted average fair value of stock options granted (in dollars per share) \| $ / shares	$ 7.01
Management Grant [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted share units granted (in shares) \| shares	10.6
Weighted average fair value of restricted share units granted (in dollars per share) \| $ / shares	$ 37.42

Supplemental Financial Information (Receivables)(Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Supplemental Financial Information [Line Items]
Receivables, gross	$ 8,111	$ 8,622
Less: Allowance for returns and customer incentives	347	417
Less: Allowance for doubtful accounts	239	250
Receivables, net	7,525	7,955
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Receivables, gross	6,647	6,799
Less: Allowance for returns and customer incentives	343	413
Less: Allowance for doubtful accounts	77	84
Receivables, net	$ 6,227	$ 6,302

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities	$ 104		$ 2
Deferred gains (losses) on cash flow hedges	(7)		(60)
Unrecognized gains (losses) on employee benefit obligations	282		8
Cumulative translation adjustments	(37)		(34)
Accumulated other comprehensive income (loss)	342	$ 98	(84)
NBCUniversal Media LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities	1		0
Deferred gains (losses) on cash flow hedges	9		(19)
Unrecognized gains (losses) on employee benefit obligations	120		3
Cumulative translation adjustments	(59)		(52)
Accumulated other comprehensive income (loss)	$ 71	$ (135)	$ (68)

Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Financial Information [Line Items]
Net income	$ 2,647	$ 2,224
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,502	2,278
Share-based compensation	173	153
Noncash interest expense (income), net	58	55
Equity in net (income) losses of investees, net	(36)	11
Cash received from investees	17	16
Net (gain) loss on investment activity and other	(53)	(126)
Deferred income taxes	265	217
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	465	562
Film and television costs, net	46	(80)
Accounts payable and accrued expenses related to trade creditors	(190)	12
Other operating assets and liabilities	(238)	77
Net cash provided by operating activities	5,656	5,399
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Net income	1,273	1,082
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	508	414
Equity in net (income) losses of investees, net	26	2
Cash received from investees	14	12
Net (gain) loss on investment activity and other	(18)	(114)
Deferred income taxes	9	48
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	104	349
Film and television costs, net	46	(84)
Accounts payable and accrued expenses related to trade creditors	(190)	(139)
Other operating assets and liabilities	(295)	(393)
Net cash provided by operating activities	$ 1,477	$ 1,177

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Payments for Interest and Income Taxes
Interest	$ 895	$ 723
Income taxes	132	190
NBCUniversal Media LLC [Member]
Cash Payments for Interest and Income Taxes
Interest	77	66
Income taxes	$ 52	$ 59

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares
Supplemental Financial Information [Line Items]
Capital expenditures incurred but not yet paid	$ 1,200
Dividends payable	$ 747
Dividends payable (in dollars per share) \| $ / shares	$ 0.1575
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Capital expenditures incurred but not yet paid	$ 216

Commitments and Contingencies (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Commitment And Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 950
Level 2 [Member] \| Redeemable Preferred Stock [Member] \| NBCUniversal Enterprise [Member]
Commitment And Contingencies [Line Items]
Temporary Equity, Fair Value Of Redeemable Subsidiary Preferred Stock	$ 763

Financial Data by Business Segment (Details) $ in Millions	3 Months Ended
Financial Data by Business Segment (Details) $ in Millions	Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	5
Revenue	$ 20,463	$ 18,790
Adjusted EBITDA	7,032	6,367
Depreciation and amortization	2,502	2,278
Operating income (loss)	4,530	4,089
Capital Expenditures	2,078	1,885
Cash paid for intangible assets	$ 416	378
Segment Reporting, Disclosure of Major Customers	No single customer accounted for a significant amount of revenue in any period.
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	4
Revenue	$ 7,868	6,861
Adjusted EBITDA	2,017	1,622
Depreciation and amortization	508	414
Operating income (loss)	1,509	1,208
Capital Expenditures	285	295
Cash paid for intangible assets	$ 55	52
Segment Reporting, Disclosure of Major Customers	No single customer accounted for a significant amount of revenue in any period.
NBCUniversal [Member]
Segment Reporting Information [Line Items]
Revenue	$ 7,868	6,861
Adjusted EBITDA	2,017	1,622
Depreciation and amortization	508	414
Operating income (loss)	1,509	1,208
Capital Expenditures	285	295
Cash paid for intangible assets	55	52
Operating Segments [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Revenue	12,912	12,204
Adjusted EBITDA	5,198	4,889
Depreciation and amortization	1,980	1,843
Operating income (loss)	3,218	3,046
Capital Expenditures	1,781	1,576
Cash paid for intangible assets	$ 352	$ 324
Cable segment revenue types as percentage of total cable revenue	100.00%	100.00%
Operating Segments [Member] \| Cable Networks [Member]
Segment Reporting Information [Line Items]
Revenue	$ 2,641	$ 2,453
Adjusted EBITDA	1,116	956
Depreciation and amortization	214	190
Operating income (loss)	902	766
Capital Expenditures	2	1
Cash paid for intangible assets	3	1
Operating Segments [Member] \| Cable Networks [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	2,641	2,453
Adjusted EBITDA	1,116	956
Depreciation and amortization	214	190
Operating income (loss)	902	766
Capital Expenditures	2	1
Cash paid for intangible assets	3	1
Operating Segments [Member] \| Broadcast Television [Member]
Segment Reporting Information [Line Items]
Revenue	2,208	2,084
Adjusted EBITDA	322	284
Depreciation and amortization	32	32
Operating income (loss)	290	252
Capital Expenditures	29	19
Cash paid for intangible assets	3	3
Operating Segments [Member] \| Broadcast Television [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	2,208	2,084
Adjusted EBITDA	322	284
Depreciation and amortization	32	32
Operating income (loss)	290	252
Capital Expenditures	29	19
Cash paid for intangible assets	3	3
Operating Segments [Member] \| Filmed Entertainment [Member]
Segment Reporting Information [Line Items]
Revenue	1,981	1,383
Adjusted EBITDA	368	167
Depreciation and amortization	21	8
Operating income (loss)	347	159
Capital Expenditures	10	3
Cash paid for intangible assets	5	3
Operating Segments [Member] \| Filmed Entertainment [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	1,981	1,383
Adjusted EBITDA	368	167
Depreciation and amortization	21	8
Operating income (loss)	347	159
Capital Expenditures	10	3
Cash paid for intangible assets	5	3
Operating Segments [Member] \| Theme Parks [Member]
Segment Reporting Information [Line Items]
Revenue	1,118	1,026
Adjusted EBITDA	397	375
Depreciation and amortization	142	98
Operating income (loss)	255	277
Capital Expenditures	229	200
Cash paid for intangible assets	13	9
Operating Segments [Member] \| Theme Parks [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	1,118	1,026
Adjusted EBITDA	397	375
Depreciation and amortization	142	98
Operating income (loss)	255	277
Capital Expenditures	229	200
Cash paid for intangible assets	13	9
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue	208	199
Adjusted EBITDA	(194)	(154)
Depreciation and amortization	14	21
Operating income (loss)	(208)	(175)
Capital Expenditures	12	14
Cash paid for intangible assets	9	2
Corporate, Non-Segment [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	8	3
Adjusted EBITDA	(185)	(160)
Depreciation and amortization	99	86
Operating income (loss)	(284)	(246)
Capital Expenditures	15	72
Cash paid for intangible assets	31	36
Corporate, Non-Segment [Member] \| NBCUniversal [Member]
Segment Reporting Information [Line Items]
Revenue	8	3
Adjusted EBITDA	(185)	(160)
Depreciation and amortization	99	86
Operating income (loss)	(284)	(246)
Capital Expenditures	15	72
Cash paid for intangible assets	31	36
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue	(525)	(474)
Adjusted EBITDA	11	10
Depreciation and amortization	0	0
Operating income (loss)	11	10
Capital Expenditures	0	0
Cash paid for intangible assets	0	0
Consolidation, Eliminations [Member] \| NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue	(88)	(88)
Adjusted EBITDA	(1)	0
Depreciation and amortization	0	0
Operating income (loss)	(1)	0
Capital Expenditures	0	0
Cash paid for intangible assets	0	0
Consolidation, Eliminations [Member] \| NBCUniversal [Member]
Segment Reporting Information [Line Items]
Revenue	(88)	(88)
Adjusted EBITDA	(1)	0
Depreciation and amortization	0	0
Operating income (loss)	(1)	0
Capital Expenditures	0	0
Cash paid for intangible assets	$ 0	$ 0
Residential Video Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	44.70%	45.40%
Residential High-speed Internet Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	27.90%	26.80%
Residential Voice Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	6.70%	7.30%
Business Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	11.50%	10.70%
Advertising Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	4.00%	4.50%
Other Products And Services [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	5.20%	5.30%
Franchise And Other Regulatory Fees [Member] \| Operating Segments [Member] \| Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue	2.80%	2.90%

Financial Data by Business Segment Financial Data by Business Segment (Reconciliation of Adjusted EBITDA from Segment to Consolidated Statements) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	$ 7,032	$ 6,367
Depreciation	(1,915)	(1,785)
Amortization	(587)	(493)
Other income (expense) items, net	(625)	(554)
Income before income taxes	3,905	3,535
NBCUniversal Media LLC [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	2,017	1,622
Depreciation	(231)	(192)
Amortization	(277)	(222)
Other income (expense) items, net	(144)	(28)
Income before income taxes	$ 1,365	$ 1,180

Condensed Consolidating Financial Information (Narrative) (Details) $ in Millions	Mar. 31, 2017 USD ($)
NBCUniversal Enterprise Senior Debt Securities [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	$ 3,300
Comcast Holdings' ZONES due October 2029 [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	185
Comcast Holdings' ZONES due November 2029 [Member]
Debt Instrument [Line Items]
Principal amount of debt securities not subject to guarantee	62
Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Principal amount of debt securities not subject to guarantee	$ 3,400

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 4,022	$ 3,301	$ 5,628	$ 2,295
Receivables, net	7,525	7,955
Programming rights	1,479	1,250
Other current assets	2,219	3,855
Total current assets	15,245	16,361
Film and television costs	6,968	7,252
Investments	5,938	5,247
Investments in and amounts due from subsidiaries eliminated upon consolidation	0	0
Property and equipment, net	36,626	36,253
Franchise rights	59,364	59,364
Goodwill	36,592	35,980
Other intangible assets, net	19,014	17,274
Other noncurrent assets, net	2,732	2,769
Total assets	182,479	180,500
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,658	6,915
Accrued participations and residuals	1,811	1,726
Accrued expenses and other current liabilities	7,096	7,414
Current portion of long-term debt	3,509	5,480
Total current liabilities	19,074	21,535
Long-term debt, less current portion	58,276	55,566
Deferred income taxes	35,348	34,854
Other noncurrent liabilities	10,677	10,925
Redeemable noncontrolling interests	1,456	1,446
Equity:
Common stock	56	56
Other shareholders' equity	55,003	53,887
Total Comcast Corporation shareholders’ equity	55,059	53,943
Noncontrolling interests	2,589	2,231
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	57,648	56,174	54,512	53,978
Total liabilities and equity	182,479	180,500
Elimination and Consolidation Adjustments [Member]
Assets
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	(498,726)	(481,214)
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	(1,005)	(1,017)
Total assets	(499,731)	(482,231)
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	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	(1,005)	(1,017)
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders' equity	(498,726)	(481,214)
Total Comcast Corporation shareholders’ equity	(498,726)	(481,214)
Noncontrolling interests	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(498,726)	(481,214)
Total liabilities and equity	(499,731)	(482,231)
Comcast Parent [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	96	151
Total current assets	96	151
Film and television costs	0	0
Investments	84	75
Investments in and amounts due from subsidiaries eliminated upon consolidation	100,103	98,350
Property and equipment, net	364	298
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	12	13
Other noncurrent assets, net	1,115	1,138
Total assets	101,774	100,025
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	17	23
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities	1,582	1,726
Current portion of long-term debt	1,905	3,739
Total current liabilities	3,504	5,488
Long-term debt, less current portion	40,711	38,123
Deferred income taxes	0	0
Other noncurrent liabilities	2,500	2,471
Redeemable noncontrolling interests	0	0
Equity:
Common stock	56	56
Other shareholders' equity	55,003	53,887
Total Comcast Corporation shareholders’ equity	55,059	53,943
Noncontrolling interests	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	55,059	53,943
Total liabilities and equity	101,774	100,025
Comcast Holdings [Member]
Assets
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	123,806	120,071
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	666	638
Total assets	124,472	120,709
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	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	143	141
Deferred income taxes	524	542
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders' equity	123,805	120,026
Total Comcast Corporation shareholders’ equity	123,805	120,026
Noncontrolling interests	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	123,805	120,026
Total liabilities and equity	124,472	120,709
CCCL Parent [Member]
Assets
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	10	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	120,362	117,696
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	0	0
Total assets	120,372	117,696
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities	211	341
Current portion of long-term debt	550	550
Total current liabilities	761	891
Long-term debt, less current portion	2,100	2,100
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders' equity	117,511	114,705
Total Comcast Corporation shareholders’ equity	117,511	114,705
Noncontrolling interests	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	117,511	114,705
Total liabilities and equity	120,372	117,696
NBCUniversal Media Parent [Member]
Assets
Cash and cash equivalents	270	482	178	414
Receivables, net	0	0
Programming rights	0	0
Other current assets	60	36
Total current assets	330	518
Film and television costs	0	0
Investments	657	651
Investments in and amounts due from subsidiaries eliminated upon consolidation	49,537	47,393
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	80	89
Total assets	50,604	48,651
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities	361	302
Current portion of long-term debt	4	4
Total current liabilities	365	306
Long-term debt, less current portion	8,204	8,208
Deferred income taxes	69	70
Other noncurrent liabilities	1,103	1,166
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders' equity	40,863	38,901
Total Comcast Corporation shareholders’ equity	40,863	38,901
Noncontrolling interests	0	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	40,863	38,901
Total liabilities and equity	50,604	48,651
Comcast Non-Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	3,752	2,819	$ 5,450	$ 1,881
Receivables, net	7,525	7,955
Programming rights	1,479	1,250
Other current assets	2,063	3,668
Total current assets	14,819	15,692
Film and television costs	6,968	7,252
Investments	5,187	4,521
Investments in and amounts due from subsidiaries eliminated upon consolidation	104,918	97,704
Property and equipment, net	36,262	35,955
Franchise rights	59,364	59,364
Goodwill	36,592	35,980
Other intangible assets, net	19,002	17,261
Other noncurrent assets, net	1,876	1,921
Total assets	284,988	275,650
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,641	6,892
Accrued participations and residuals	1,811	1,726
Accrued expenses and other current liabilities	4,942	5,045
Current portion of long-term debt	1,050	1,187
Total current liabilities	14,444	14,850
Long-term debt, less current portion	7,118	6,994
Deferred income taxes	35,760	35,259
Other noncurrent liabilities	7,074	7,288
Redeemable noncontrolling interests	1,456	1,446
Equity:
Common stock	0	0
Other shareholders' equity	216,547	207,582
Total Comcast Corporation shareholders’ equity	216,547	207,582
Noncontrolling interests	2,589	2,231
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	219,136	209,813
Total liabilities and equity	$ 284,988	$ 275,650

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue:
Service revenue	$ 20,463	$ 18,790
Management fee revenue	0	0
Revenue	20,463	18,790
Costs and Expenses:
Programming and production	6,074	5,431
Other operating and administrative	5,827	5,526
Advertising, marketing and promotion	1,530	1,466
Depreciation	1,915	1,785
Amortization	587	493
Costs and expenses, total	15,933	14,701
Operating income (loss)	4,530	4,089
Other Income (Expense):
Interest expense	(755)	(703)
Investment income (loss), net	59	30
Equity in net income (losses) of investees, net	36	(11)
Other income (expense), net	35	130
Other income (expense) items, net	(625)	(554)
Income (loss) before income taxes	3,905	3,535
Income tax (expense) benefit	(1,258)	(1,311)
Net income (loss)	2,647	2,224
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(81)	(90)
Net income (loss) attributable to Parent	2,566	2,134
Comprehensive income attributable to Parent	2,810	2,224
Elimination and Consolidation Adjustments [Member]
Revenue:
Service revenue	0	0
Management fee revenue	(545)	(513)
Revenue	(545)	(513)
Costs and Expenses:
Programming and production	0	0
Other operating and administrative	(545)	(513)
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	(545)	(513)
Operating income (loss)	0	0
Other Income (Expense):
Interest expense	0	0
Investment income (loss), net	0	0
Equity in net income (losses) of investees, net	(10,606)	(9,043)
Other income (expense), net	0	0
Other income (expense) items, net	(10,606)	(9,043)
Income (loss) before income taxes	(10,606)	(9,043)
Income tax (expense) benefit	0	0
Net income (loss)	(10,606)	(9,043)
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	(10,606)	(9,043)
Comprehensive income attributable to Parent	(11,107)	(9,235)
Comcast Parent [Member]
Revenue:
Service revenue	0	0
Management fee revenue	275	259
Revenue	275	259
Costs and Expenses:
Programming and production	0	0
Other operating and administrative	170	156
Advertising, marketing and promotion	0	0
Depreciation	7	8
Amortization	2	1
Costs and expenses, total	179	165
Operating income (loss)	96	94
Other Income (Expense):
Interest expense	(517)	(451)
Investment income (loss), net	1	0
Equity in net income (losses) of investees, net	2,839	2,366
Other income (expense), net	0	0
Other income (expense) items, net	2,323	1,915
Income (loss) before income taxes	2,419	2,009
Income tax (expense) benefit	147	125
Net income (loss)	2,566	2,134
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	2,566	2,134
Comprehensive income attributable to Parent	2,810	2,224
Comcast Holdings [Member]
Revenue:
Service revenue	0	0
Management fee revenue	0	0
Revenue	0	0
Costs and Expenses:
Programming and production	0	0
Other operating and administrative	0	0
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	0	0
Operating income (loss)	0	0
Other Income (Expense):
Interest expense	(3)	(3)
Investment income (loss), net	28	0
Equity in net income (losses) of investees, net	2,650	2,264
Other income (expense), net	0	0
Other income (expense) items, net	2,675	2,261
Income (loss) before income taxes	2,675	2,261
Income tax (expense) benefit	(9)	1
Net income (loss)	2,666	2,262
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	2,666	2,262
Comprehensive income attributable to Parent	2,716	2,306
CCCL Parent [Member]
Revenue:
Service revenue	0	0
Management fee revenue	270	254
Revenue	270	254
Costs and Expenses:
Programming and production	0	0
Other operating and administrative	270	254
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	270	254
Operating income (loss)	0	0
Other Income (Expense):
Interest expense	(60)	(59)
Investment income (loss), net	0	0
Equity in net income (losses) of investees, net	2,320	2,114
Other income (expense), net	0	0
Other income (expense) items, net	2,260	2,055
Income (loss) before income taxes	2,260	2,055
Income tax (expense) benefit	21	21
Net income (loss)	2,281	2,076
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	2,281	2,076
Comprehensive income attributable to Parent	2,282	2,078
NBCUniversal Media Parent [Member]
Revenue:
Service revenue	0	0
Management fee revenue	0	0
Revenue	0	0
Costs and Expenses:
Programming and production	0	0
Other operating and administrative	306	295
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	306	295
Operating income (loss)	(306)	(295)
Other Income (Expense):
Interest expense	(112)	(117)
Investment income (loss), net	(4)	(2)
Equity in net income (losses) of investees, net	1,597	1,297
Other income (expense), net	28	124
Other income (expense) items, net	1,509	1,302
Income (loss) before income taxes	1,203	1,007
Income tax (expense) benefit	(3)	(5)
Net income (loss)	1,200	1,002
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	1,200	1,002
Comprehensive income attributable to Parent	1,406	1,146
Comcast Non-Guarantor Subsidiaries [Member]
Revenue:
Service revenue	20,463	18,790
Management fee revenue	0	0
Revenue	20,463	18,790
Costs and Expenses:
Programming and production	6,074	5,431
Other operating and administrative	5,626	5,334
Advertising, marketing and promotion	1,530	1,466
Depreciation	1,908	1,777
Amortization	585	492
Costs and expenses, total	15,723	14,500
Operating income (loss)	4,740	4,290
Other Income (Expense):
Interest expense	(63)	(73)
Investment income (loss), net	34	32
Equity in net income (losses) of investees, net	1,236	991
Other income (expense), net	7	6
Other income (expense) items, net	1,214	956
Income (loss) before income taxes	5,954	5,246
Income tax (expense) benefit	(1,414)	(1,453)
Net income (loss)	4,540	3,793
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(81)	(90)
Net income (loss) attributable to Parent	4,459	3,703
Comprehensive income attributable to Parent	$ 4,703	$ 3,705

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	$ 5,656	$ 5,399
Investing Activities
Net transactions with affiliates	0	0
Capital expenditures	(2,078)	(1,885)
Cash paid for intangible assets	(416)	(378)
Acquisitions and construction of real estate properties	(130)	(140)
Acquisitions, net of cash acquired	(216)	(24)
Proceeds from sales of investments	51	110
Purchases of investments	(1,062)	(448)
Other	57	56
Net Cash Provided by (Used in) Investing Activities	(3,794)	(2,709)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,893)	(538)
Proceeds from borrowings	3,500	3,323
Repurchases and repayments of debt	(1,059)	(48)
Repurchases of common stock under repurchase program and employee plans	(996)	(1,427)
Dividends paid	(657)	(611)
Issuances of common stock	0	12
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(72)	(77)
Other	36	9
Net Cash Provided by (Used in) Financing Activities	(1,141)	643
Cash and Cash Equivalents, Period Increase (Decrease)	721	3,333
Cash and cash equivalents, beginning of period	3,301	2,295
Cash and cash equivalents, end of period	4,022	5,628
Elimination and Consolidation Adjustments [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	0	0
Investing Activities
Net transactions with affiliates	0	0
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of investments	0	0
Purchases of investments	0	0
Other	0	0
Net Cash Provided by (Used in) Investing Activities	0	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases of common stock under repurchase program and employee plans	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Comcast Parent [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	(453)	(201)
Investing Activities
Net transactions with affiliates	1,385	(679)
Capital expenditures	(1)	(3)
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	(69)	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of investments	0	0
Purchases of investments	(9)	(7)
Other	55	7
Net Cash Provided by (Used in) Investing Activities	1,361	(682)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,739)	(400)
Proceeds from borrowings	3,500	3,323
Repurchases and repayments of debt	(1,000)	0
Repurchases of common stock under repurchase program and employee plans	(996)	(1,427)
Dividends paid	(657)	(611)
Issuances of common stock	0	12
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	(16)	(14)
Net Cash Provided by (Used in) Financing Activities	(908)	883
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Comcast Holdings [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	(10)	0
Investing Activities
Net transactions with affiliates	10	0
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of investments	0	0
Purchases of investments	0	0
Other	0	0
Net Cash Provided by (Used in) Investing Activities	10	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases of common stock under repurchase program and employee plans	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
CCCL Parent [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	(168)	78
Investing Activities
Net transactions with affiliates	168	(78)
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of investments	0	0
Purchases of investments	0	0
Other	0	0
Net Cash Provided by (Used in) Investing Activities	168	(78)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases of common stock under repurchase program and employee plans	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net Cash Provided by (Used in) Financing Activities	0	0
Cash and Cash Equivalents, Period Increase (Decrease)	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
NBCUniversal Media Parent [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	(330)	(391)
Investing Activities
Net transactions with affiliates	115	63
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of investments	10	101
Purchases of investments	(4)	0
Other	0	(5)
Net Cash Provided by (Used in) Investing Activities	121	159
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	(3)	(4)
Repurchases of common stock under repurchase program and employee plans	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net Cash Provided by (Used in) Financing Activities	(3)	(4)
Cash and Cash Equivalents, Period Increase (Decrease)	(212)	(236)
Cash and cash equivalents, beginning of period	482	414
Cash and cash equivalents, end of period	270	178
Comcast Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Cash Provided by (Used in) Operating Activities	6,617	5,913
Investing Activities
Net transactions with affiliates	(1,678)	694
Capital expenditures	(2,077)	(1,882)
Cash paid for intangible assets	(416)	(378)
Acquisitions and construction of real estate properties	(61)	(140)
Acquisitions, net of cash acquired	(216)	(24)
Proceeds from sales of investments	41	9
Purchases of investments	(1,049)	(441)
Other	2	54
Net Cash Provided by (Used in) Investing Activities	(5,454)	(2,108)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(154)	(138)
Proceeds from borrowings	0	0
Repurchases and repayments of debt	(56)	(44)
Repurchases of common stock under repurchase program and employee plans	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(72)	(77)
Other	52	23
Net Cash Provided by (Used in) Financing Activities	(230)	(236)
Cash and Cash Equivalents, Period Increase (Decrease)	933	3,569
Cash and cash equivalents, beginning of period	2,819	1,881
Cash and cash equivalents, end of period	$ 3,752	$ 5,450