NBCUniversal Media 10-Q 29 Sep 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2017shares
Document And Entity Information [Line Items]
Entity Registrant Name	NBCUniversal Media, LLC
Entity Central Index Key	902,739
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Comcast Corp
Document And Entity Information [Line Items]
Entity Registrant Name	COMCAST CORP
Entity Central Index Key	1,166,691
Trading Symbol	cmcsa
Entity Filer Category	Large Accelerated Filer
Class A Common Stock [Member] | Comcast Corp
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	4,703,928,010
Class B Common Stock [Member] | Comcast Corp
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	9,444,375

Condensed Consolidated Balance

Condensed Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 2,693	$ 3,301
Receivables, net	7,849	7,955
Programming rights	1,633	1,250
Other current assets	2,657	3,855
Total current assets	14,832	16,361
Film and television costs	6,595	7,252
Investments	6,521	5,247
Property and equipment, net	37,171	36,253
Franchise rights	59,364	59,364
Goodwill	36,742	35,980
Other intangible assets, net	18,907	17,274
Other noncurrent assets, net	2,899	2,769
Total assets	183,031	180,500
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	6,730	6,915
Accrued participations and residuals	1,882	1,726
Deferred revenue	1,448	1,132
Accrued expenses and other current liabilities	5,858	6,282
Current portion of long-term debt	6,358	5,480
Total current liabilities	22,276	21,535
Long-term debt, less current portion	57,210	55,566
Deferred income taxes	35,409	34,854
Other noncurrent liabilities	10,837	10,925
Commitments and contingencies (Note 10)
Redeemable noncontrolling interests	1,451	1,446
Equity:
Preferred stock—authorized, 20,000,000 shares; issued, zero	0	0
Common stock	56	56
Additional paid-in capital	37,478	38,230
Retained earnings	24,560	23,076
Treasury stock, 872,791,028 Class A common shares	(7,517)	(7,517)
Accumulated other comprehensive income (loss)	428	98
Total Comcast Corporation shareholders’ equity	55,005	53,943
Noncontrolling interests	843	2,231
Total equity	55,848	56,174
Total liabilities and equity	183,031	180,500
NBCUniversal Media LLC [Member]
Current Assets:
Cash and cash equivalents	1,844	1,966
Receivables, net	6,319	6,302
Programming rights	1,625	1,241
Other current assets	1,496	938
Total current assets	11,284	10,447
Film and television costs	6,590	7,245
Investments	1,890	1,263
Property and equipment, net	10,845	10,511
Goodwill	23,946	23,323
Intangible assets, net	13,555	13,777
Other noncurrent assets, net	1,697	1,688
Total assets	69,807	68,254
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	1,490	1,647
Accrued participations and residuals	1,882	1,726
Program obligations	600	807
Deferred revenue	1,357	1,016
Accrued expenses and other current liabilities	1,914	1,888
Note payable to Comcast	2,981	2,703
Current portion of long-term debt	194	127
Total current liabilities	10,418	9,914
Long-term debt, less current portion	12,149	11,461
Accrued participations, residuals and program obligations	1,196	1,202
Other noncurrent liabilities	4,117	4,130
Commitments and contingencies (Note 10)
Redeemable noncontrolling interests	512	530
Equity:
Member’s capital	40,411	39,036
Accumulated other comprehensive income (loss)	56	(135)
Total NBCUniversal member’s equity	40,467	38,901
Noncontrolling interests	948	2,116
Total equity	41,415	41,017
Total liabilities and equity	69,807	68,254
Class A Common Stock [Member]
Equity:
Common stock	56	56
Class B Common Stock [Member]
Equity:
Common stock	$ 0	$ 0

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Property and equipment - accumulated depreciation	$ 49,951	$ 49,694
Other intangible assets - accumulated amortization	$ 11,900	$ 11,013
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
NBCUniversal Media LLC [Member]
Property and equipment - accumulated depreciation	$ 3,773	$ 3,350
Other intangible assets - accumulated amortization	$ 7,105	$ 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)	5,576,719,038	5,614,950,039
Common stock, shares outstanding (in shares)	4,703,928,010	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 Statemen

Condensed Consolidated Statement of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 21,165	$ 19,269	$ 41,628	$ 38,059
Costs and Expenses:
Programming and production	6,341	5,492	12,415	10,923
Other operating and administrative	6,060	5,763	11,887	11,289
Advertising, marketing and promotion	1,665	1,559	3,195	3,025
Depreciation	1,970	1,868	3,885	3,653
Amortization	571	521	1,158	1,014
Total costs and expenses	16,607	15,203	32,540	29,904
Operating income	4,558	4,066	9,088	8,155
Other Income (Expense):
Interest expense	(758)	(732)	(1,513)	(1,435)
Investment income (loss), net	64	58	123	88
Equity in net income (losses) of investees, net	15	(19)	51	(30)
Other income (expense), net	20	(15)	55	115
Total other income (expense)	(659)	(708)	(1,284)	(1,262)
Income before income taxes	3,899	3,358	7,804	6,893
Income tax expense	(1,364)	(1,278)	(2,622)	(2,589)
Net income	2,535	2,080	5,182	4,304
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(22)	(52)	(103)	(142)
Net income attributable to Comcast Corporation	$ 2,513	$ 2,028	$ 5,079	$ 4,162
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.53	$ 0.42	$ 1.07	$ 0.86
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	0.52	0.41	1.05	0.85
Dividends declared per common share (in dollars per share)	$ 0.1575	$ 0.1375	$ 0.315	$ 0.275
NBCUniversal Media LLC [Member]
Revenue	$ 8,331	$ 7,103	$ 16,199	$ 13,964
Costs and Expenses:
Programming and production	3,587	3,037	6,900	6,002
Other operating and administrative	1,895	1,652	3,727	3,247
Advertising, marketing and promotion	778	725	1,484	1,404
Depreciation	265	223	496	415
Amortization	255	242	532	464
Total costs and expenses	6,780	5,879	13,139	11,532
Operating income	1,551	1,224	3,060	2,432
Other Income (Expense):
Interest expense	(149)	(146)	(292)	(293)
Investment income (loss), net	10	8	24	14
Equity in net income (losses) of investees, net	(29)	(19)	(55)	(21)
Other income (expense), net	4	(18)	15	97
Total other income (expense)	(164)	(175)	(308)	(203)
Income before income taxes	1,387	1,049	2,752	2,229
Income tax expense	(99)	(74)	(191)	(172)
Net income	1,288	975	2,561	2,057
Net (income) loss attributable to noncontrolling interests	(12)	(42)	(85)	(122)
Net income attributable to Comcast Corporation	$ 1,276	$ 933	$ 2,476	$ 1,935

Condensed Consolidated Stateme5

Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income	$ 2,535	$ 2,080	$ 5,182	$ 4,304
Unrealized gains (losses) on marketable securities, net of deferred taxes	(87)	1	17	3
Deferred gains (losses) on cash flow hedges, net of deferred taxes	5	(60)	12	(91)
Amounts reclassified to net income:
Realized (gains) losses on marketable securities, net of deferred taxes	0	0	0	(1)
Realized (gains) losses on cash flow hedges, net of deferred taxes	(14)	45	(14)	62
Employee benefit obligations, net of deferred taxes	(6)	0	57	2
Currency translation adjustments, net of deferred taxes	(11)	249	146	487
Comprehensive income	2,422	2,315	5,400	4,766
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(22)	(52)	(103)	(142)
Other comprehensive (income) loss attributable to noncontrolling interests	5	(150)	(82)	(287)
Comprehensive income attributable to Parent	2,405	2,113	5,215	4,337
NBCUniversal Media LLC [Member]
Net income	1,288	975	2,561	2,057
Unrealized gains (losses) on marketable securities, net of deferred taxes	(140)	0	(139)	0
Deferred gains (losses) on cash flow hedges, net of deferred taxes	(8)	6	(22)	(12)
Amounts reclassified to net income:
Employee benefit obligations, net of deferred taxes	(2)	0	104	4
Currency translation adjustments, net of deferred taxes	(11)	307	189	602
Comprehensive income	1,127	1,288	2,693	2,651
Net (income) loss attributable to noncontrolling interests	(12)	(42)	(85)	(122)
Other comprehensive (income) loss attributable to noncontrolling interests	5	(150)	(82)	(287)
Comprehensive income attributable to Parent	$ 1,120	$ 1,096	$ 2,526	$ 2,242

Condensed Consolidated Stateme6

Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gains (losses) on marketable securities, deferred taxes	$ 52	$ 0	$ (9)	$ (1)
Deferred gains (losses) on cash flow hedges, deferred taxes	(3)	35	(7)	53
Realized (gains) losses on marketable securities, deferred taxes	0	0	0	1
Realized (gains) losses on cash flow hedges, deferred taxes	8	(26)	8	(36)
Employee benefit obligations, deferred taxes	4	0	(33)	(2)
Currency translation adjustments, deferred taxes	$ 2	$ (58)	$ (39)	$ (116)

Condensed Consolidated Stateme7

Condensed Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net cash provided by operating activities	$ 10,814	$ 9,794
Investing Activities
Capital expenditures	(4,405)	(4,156)
Cash paid for intangible assets	(836)	(737)
Acquisitions and construction of real estate properties	(250)	(211)
Acquisitions, net of cash acquired	(398)	(126)
Proceeds from sales of investments	57	138
Purchases of investments	(1,825)	(580)
Other	170	(156)
Net cash provided by (used in) investing activities	(7,487)	(5,828)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	(1,695)	205
Proceeds from borrowings	8,963	4,753
Repurchases and repayments of debt	(4,967)	(2,551)
Repurchases of common stock under repurchase program and employee plans	(2,476)	(2,636)
Dividends paid	(1,404)	(1,281)
Purchase of Universal Studios Japan noncontrolling interests	(2,299)	0
Issuances of common stock	0	19
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(137)	(125)
Other	80	20
Net cash provided by (used in) financing activities	(3,935)	(1,596)
Increase (decrease) in cash and cash equivalents	(608)	2,370
Cash and cash equivalents, beginning of period	3,301	2,295
Cash and cash equivalents, end of period	2,693	4,665
NBCUniversal Media LLC [Member]
Operating Activities
Net cash provided by operating activities	3,526	2,478
Investing Activities
Capital expenditures	(623)	(655)
Cash paid for intangible assets	(128)	(114)
Acquisitions of real estate properties	0	(78)
Proceeds from sales of investments	10	102
Other	(241)	(107)
Net cash provided by (used in) investing activities	(982)	(852)
Financing Activities
Proceeds from borrowings	3,948	0
Repurchases and repayments of debt	(3,402)	(1,083)
Proceeds from (repayments of) borrowings from Comcast, net	278	134
Purchase of Universal Studios Japan noncontrolling interests	(2,299)	0
Distributions to member	(1,141)	(853)
Distributions to noncontrolling interests	(116)	(104)
Other	66	25
Net cash provided by (used in) financing activities	(2,666)	(1,881)
Increase (decrease) in cash and cash equivalents	(122)	(255)
Cash and cash equivalents, beginning of period	1,966	1,410
Cash and cash equivalents, end of period	$ 1,844	$ 1,155

Condensed Consolidated Stateme8

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	$ 53,978		$ 38,490	$ 21,413	$ (7,517)	$ (174)	$ 1,709						$ 57	$ 0
Beginning balance at Dec. 31, 2015								$ 34,303		$ 32,834	$ (212)	$ 1,681
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	422		422
Repurchases of common stock under repurchase program and employee plans	(2,640)		(519)	(2,121)
Employee stock purchase plans	78		78
Dividends declared	(1,337)			(1,337)				(853)		(853)
Other comprehensive income (loss)	462					175	287	594			307	287
Contributions from (distributions to) noncontrolling interests, net	(68)						(68)	(75)				(75)
Other	123		(31)				154	160		5		155
Net income (loss)	4,258			4,162			96	2,033		1,935		98
Ending balance at Jun. 30, 2016	55,276		38,440	22,117	(7,517)	1	2,178						57	0
Ending balance at Jun. 30, 2016								36,162		33,921	95	2,146
Beginning balance at Dec. 31, 2015		$ 1,221							$ 372
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions from (distributions to) noncontrolling interests, net		1							(29)
Other		(20)
Net income (loss)		46							24
Ending balance at Jun. 30, 2016		1,248							367
Beginning balance at Dec. 31, 2016	56,174		38,230	23,076	(7,517)	98	2,231						56	0
Beginning balance at Dec. 31, 2016								41,017		39,036	(135)	2,116
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	288		288
Repurchases of common stock under repurchase program and employee plans	(2,476)		(379)	(2,097)
Employee stock purchase plans	94		94
Dividends declared	(1,498)			(1,498)				(1,141)		(1,141)
Other comprehensive income (loss)	218					136	82	132			50	82
Contributions from (distributions to) noncontrolling interests, net	(49)						(49)	(55)				(55)
Purchase of Universal Studios Japan noncontrolling interests	(2,238)		(696)			194	(1,736)	(2,299)		(704)	141	(1,736)
Contribution from member								662		662
Other	194		(59)				253	556		82		474
Net income (loss)	5,141			5,079			62	2,543		2,476		67
Ending balance at Jun. 30, 2017	55,848		$ 37,478	$ 24,560	$ (7,517)	$ 428	$ 843						$ 56	$ 0
Ending balance at Jun. 30, 2017								41,415		$ 40,411	$ 56	$ 948
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		(27)							(46)
Other		(9)							10
Net income (loss)		41							18
Ending balance at Jun. 30, 2017	$ 1,451	$ 1,451						$ 512	$ 512

Condensed Consolidated Financia

Condensed Consolidated Financial Statements	6 Months Ended
	Jun. 30, 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 periods 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 Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 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 substantially completed the review of our revenue arrangements and do not currently expect that the adoption of the new standard will have a 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 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 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. In addition, upon adoption, we anticipate implementing certain changes in the presentation of revenue and expenses, including changes related to the allocation of revenue among the cable services included in a bundle that our residential customers purchase at a discount. The updated guidance also requires additional disclosures regarding the nature, timing and uncertainty of our revenue transactions. We intend to adopt the provisions of the guidance using the full retrospective method, under which we will adjust any prior periods presented to reflect the updated guidance. 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, primarily our investment in Snap Inc. (see Note 6), net income attributable to Comcast Corporation would have decreased for the three months ended June 30, 2017 by $88 million and increased for the six months ended June 30, 2017 by $16 million . 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 our condensed consolidated statement of income. The excess tax benefits resulted in a decrease to income tax expense of $59 million and $198 million for the three and six months ended June 30, 2017, respectively. In addition, the excess tax benefits resulted in an increase to diluted earnings per common share attributable to Comcast Corporation shareholders of $0.01 and $0.03 for the three and six months ended June 30, 2017 , respectively. As required by the updated guidance, the prior year periods in our condensed consolidated statement of income were 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 $543 million and $411 million for the six months ended June 30, 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 substantially completed the review of our revenue arrangements and do not currently expect that the adoption of the new standard will have a 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 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 the nature, timing and uncertainty of our revenue transactions. We intend to adopt the provisions of the guidance using the full retrospective method, under which we will adjust any prior periods presented to reflect the updated guidance. 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, primarily our investment in Snap Inc. (see Note 6), net income attributable to NBCUniversal would have decreased for the three and six months ended June 30, 2017 by $140 million and $139 million , respectively. 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.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Computation of Diluted EPS Three Months Ended June 30 2017 2016 (in millions, except per share data) Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 2,513 4,728 $ 0.53 $ 2,028 4,839 $ 0.42 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 81 52 Diluted EPS attributable to Comcast Corporation shareholders $ 2,513 4,809 $ 0.52 $ 2,028 4,891 $ 0.41 Six Months Ended June 30 2017 2016 (in millions, except per share amounts) Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 5,079 4,738 $ 1.07 $ 4,162 4,853 $ 0.86 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 82 55 Diluted EPS attributable to Comcast Corporation shareholders $ 5,079 4,820 $ 1.05 $ 4,162 4,908 $ 0.85 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 and six months ended June 30, 2017 and 2016 .

Significant Transactions

Significant Transactions	6 Months Ended
	Jun. 30, 2017
Business Acquisition [Line Items]
Significant Transactions	Significant Transactions FCC Spectrum Auction On April 13, 2017, the Federal Communications Commission announced the results of its spectrum auction. In the auction, NBCUniversal relinquished its spectrum rights in the New York, Philadelphia and Chicago designated market areas (“DMAs”) where NBC and Telemundo had overlapping spectrum. NBCUniversal received proceeds of $482 million in July 2017. NBC and Telemundo stations will share broadcast signals in these DMAs. In connection with the auction, we also acquired the rights to $1.7 billion of spectrum, which were recorded to other intangible assets, net in our condensed consolidated balance sheet as of June 30, 2017. We had previously made a deposit of $1.8 billion to participate in the auction in the third quarter of 2016 and received a refund for amounts in excess of the purchase price in the second quarter of 2017. Universal Studios Japan On April 6, 2017, we acquired the remaining interests in Universal Studios Japan that we did not already own for $2.3 billion . The acquisition was funded through cash on hand and borrowings under our commercial paper program. Because we maintained control of Universal Studios Japan, the difference between the consideration transferred and the recorded value of the noncontrolling interests, as well as the related tax and accumulated other comprehensive income impacts, were recorded to additional paid-in capital. 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. 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 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 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 six months ended June 30, 2017 , we updated the preliminary allocation of purchase price for DreamWorks Animation, which primarily resulted in increases to noncontrolling interests, intangible assets and goodwill and decreases to working capital and 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. Allocation of Purchase Price (in millions) Film and television costs $ 854 Intangible assets 396 Working capital 163 Debt (381 ) Tax receivable agreement (146 ) Deferred income taxes 301 Other noncurrent assets and liabilities 134 Identifiable net assets (liabilities) acquired 1,321 Noncontrolling interests (337 ) Goodwill 2,789 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. We also 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 and six months ended June 30, 2017 .
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Significant Transactions	Significant Transactions FCC Spectrum Auction On April 13, 2017, the Federal Communications Commission announced the results of its spectrum auction. In the auction, we relinquished our spectrum rights in the New York, Philadelphia and Chicago designated market areas (“DMAs”) where NBC and Telemundo had overlapping spectrum. We received proceeds of $482 million in July 2017. NBC and Telemundo stations will share broadcast signals 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 $2.3 billion . The acquisition was funded through borrowings under our revolving credit agreement with Comcast. Because we maintained control of Universal Studios Japan, the difference between the consideration transferred and the recorded value of the noncontrolling interests, as well as the related accumulated other comprehensive income impact, were recorded to additional paid-in capital. 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. 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 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 six months ended June 30, 2017 , we updated the preliminary allocation of purchase price for DreamWorks Animation, which primarily resulted in increases to noncontrolling interests, intangible assets and goodwill and a decrease to working capital. 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. Allocation of Purchase Price (in millions) Film and television costs $ 854 Intangible assets 396 Working capital 163 Debt (381 ) Tax receivable agreement (a) (146 ) Other noncurrent assets and liabilities and other (b) 435 Identifiable net assets (liabilities) acquired 1,321 Noncontrolling interests (337 ) Goodwill 2,789 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 $289 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 and six months ended June 30, 2017 .

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Related Party Transactions	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 June 30, 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) June 30, December 31, Transactions with Comcast and Consolidated Subsidiaries Receivables, net $ 324 $ 285 Accounts payable and accrued expenses related to trade creditors $ 39 $ 55 Accrued expenses and other current liabilities $ 26 $ 4 Note payable to Comcast $ 2,981 $ 2,703 Other noncurrent liabilities $ 389 $ 389 Condensed Consolidated Statement of Income Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Transactions with Comcast and Consolidated Subsidiaries Revenue $ 460 $ 406 $ 919 $ 813 Operating costs and expenses $ (49 ) $ (44 ) $ (110 ) $ (104 ) Other income (expense) $ (28 ) $ (17 ) $ (47 ) $ (30 )

Film and Television Costs

Film and Television Costs	6 Months Ended
	Jun. 30, 2017
Film And Television Cost [Line Items]
Film And Television Costs	Film and Television Costs (in millions) June 30, December 31, Film Costs: Released, less amortization $ 1,949 $ 1,750 Completed, not released 93 50 In production and in development 813 1,310 2,855 3,110 Television Costs: Released, less amortization 1,888 1,953 In production and in development 751 853 2,639 2,806 Programming rights, less amortization 2,734 2,586 8,228 8,502 Less: Current portion of programming rights 1,633 1,250 Film and television costs $ 6,595 $ 7,252
NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Film And Television Costs	Film and Television Costs (in millions) June 30, December 31, Film Costs: Released, less amortization $ 1,949 $ 1,750 Completed, not released 93 50 In production and in development 813 1,310 2,855 3,110 Television Costs: Released, less amortization 1,888 1,953 In production and in development 751 853 2,639 2,806 Programming rights, less amortization 2,721 2,570 8,215 8,486 Less: Current portion of programming rights 1,625 1,241 Film and television costs $ 6,590 $ 7,245

Investments

Investments	6 Months Ended
	Jun. 30, 2017
Fair Value, Equity And Cost Method Investments [Line Items]
Investments	Investments (in millions) June 30, December 31, Fair Value Method: Snap $ 522 $ — Other 163 198 685 198 Equity Method: Atairos 2,233 1,601 Hulu 218 225 Other 653 550 3,104 2,376 Cost Method: AirTouch 1,606 1,599 BuzzFeed 400 400 Other 759 771 2,765 2,770 Total investments 6,554 5,344 Less: Current investments 33 97 Noncurrent investments $ 6,521 $ 5,247 Investment Income (Loss), Net Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Gains (losses) on sales and exchanges of investments, net $ — $ 13 $ (1 ) $ 15 Investment impairment losses (2 ) (1 ) (6 ) (21 ) Interest and dividend income 32 31 65 60 Other, net 34 15 65 34 Investment income (loss), net $ 64 $ 58 $ 123 $ 88 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 an available-for-sale security. 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 six months ended June 30, 2017 , we made cash capital contributions totaling $994 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 and six months ended June 30, 2017 , our share of Atairos income was $42 million and $99 million , respectively. For the three and six months ended June 30, 2016 , our share of Atairos losses was $12 million and $27 million , respectively. 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 six months ended June 30, 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 June 30, 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 $1.7 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	Investments (in millions) June 30, December 31, Fair Value Method: Snap $ 522 $ — Other 3 6 525 6 Equity Method: Hulu 218 225 Other 415 336 633 561 Cost Method: BuzzFeed 400 400 Other 351 296 751 696 Total investments 1,909 1,263 Less: Current investments 19 — Noncurrent investments $ 1,890 $ 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 of $662 million , 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 an available-for-sale security. 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 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 six months ended June 30, 2016 .

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2017
Debt Instrument [Line Items]
Long-Term Debt	Long-Term Debt As of June 30, 2017 , our debt had a carrying value of $63.6 billion and an estimated fair value of $70.3 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 June 2017, NBCUniversal Enterprise issued $ 1.5 billion aggregate principal amount of senior floating rate notes due 2021. 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 May 2017, we repaid at maturity $550 million aggregate principal amount of 8.875% senior notes due 2017. In January 2017, we repaid at maturity $1.0 billion aggregate principal amount of 6.50% senior notes due 2017. In May 2017, Universal Studios Japan entered into a new ¥450 billion ( $3.9 billion at issuance) term loan with a final maturity of March 2022. We used the proceeds from this borrowing to repay in full $3.3 billion of Universal Studios Japan’s existing yen-denominated term loans and a portion of amounts outstanding under our commercial paper program. Revolving Credit Facilities As of June 30, 2017 , amounts available under our consolidated revolving credit facilities, net of amounts outstanding under our commercial paper programs and outstanding letters of credit, totaled $7.2 billion , which included $1.5 billion available under NBCUniversal Enterprise’s revolving credit facility. Commercial Paper Programs In June 2017, we increased the Comcast and NBCUniversal Enterprise commercial paper programs to $7.0 billion and $1.5 billion , respectively, to coincide with the Comcast and NBCUniversal Enterprise revolving credit facilities’ commitments. As of June 30, 2017 , Comcast had $1.1 billion face amount of commercial paper outstanding and NBCUniversal Enterprise had no commercial paper outstanding.
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Long-Term Debt	Long-Term Debt As of June 30, 2017 , our debt, excluding the note payable to Comcast, had a carrying value of $12.3 billion and an estimated fair value of $13.5 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. In May 2017, Universal Studios Japan entered into a new ¥450 billion ( $3.9 billion at issuance) term loan with a final maturity of March 2022. We used the proceeds from this borrowing to repay in full $3.3 billion of Universal Studios Japan’s existing yen-denominated term loans and a portion of amounts outstanding under our revolving credit agreement with Comcast. 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 June 30, 2017 , outstanding debt securities of $46.1 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 $4.8 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. The Universal Studios Japan term loan is not subject to the cross-guarantee structure, however it has a separate guarantee from Comcast.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation	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 Six Months Ended (in millions) 2017 2016 2017 2016 Restricted share units $ 111 $ 89 $ 185 $ 159 Stock options 63 48 103 85 Employee stock purchase plans 7 8 17 16 Total $ 181 $ 145 $ 305 $ 260 As of June 30, 2017 , we had unrecognized pretax compensation expense of $915 million and $502 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	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 Six Months Ended (in millions) 2017 2016 2017 2016 Restricted share units $ 34 $ 27 $ 54 $ 45 Stock options 5 2 7 4 Employee stock purchase plans 1 2 4 5 Total $ 40 $ 31 $ 65 $ 54

Supplemental Financial Informat

Supplemental Financial Information	6 Months Ended
	Jun. 30, 2017
Supplemental Financial Information [Line Items]
Supplemental Financial Information	Supplemental Financial Information Receivables (in millions) June 30, December 31, Receivables, gross $ 8,459 $ 8,622 Less: Allowance for returns and customer incentives 345 417 Less: Allowance for doubtful accounts 265 250 Receivables, net $ 7,849 $ 7,955 Accumulated Other Comprehensive Income (Loss) (in millions) June 30, June 30, Unrealized gains (losses) on marketable securities $ 17 $ 3 Deferred gains (losses) on cash flow hedges (16 ) (75 ) Unrecognized gains (losses) on employee benefit obligations 276 8 Cumulative translation adjustments 151 65 Accumulated other comprehensive income (loss), net of deferred taxes $ 428 $ 1 Net Cash Provided by Operating Activities Six Months Ended (in millions) 2017 2016 Net income $ 5,182 $ 4,304 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 5,043 4,667 Share-based compensation 391 331 Noncash interest expense (income), net 122 113 Equity in net (income) losses of investees, net (51 ) 30 Cash received from investees 49 42 Net (gain) loss on investment activity and other (110 ) (126 ) Deferred income taxes 470 618 Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Current and noncurrent receivables, net 18 172 Film and television costs, net 277 (171 ) Accounts payable and accrued expenses related to trade creditors (144 ) (104 ) Other operating assets and liabilities (433 ) (82 ) Net cash provided by operating activities $ 10,814 $ 9,794 Cash Payments for Interest and Income Taxes Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Interest $ 477 $ 512 $ 1,372 $ 1,235 Income taxes $ 2,077 $ 1,495 $ 2,209 $ 1,685 Noncash Investing and Financing Activities During the six months ended June 30, 2017 : • we acquired $1.3 billion of property and equipment and intangible assets that were accrued but unpaid • we recorded a liability of $742 million for a quarterly cash dividend of $0.1575 per common share to be paid in July 2017
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Supplemental Financial Information	Supplemental Financial Information Receivables (in millions) June 30, December 31, Receivables, gross $ 6,738 $ 6,799 Less: Allowance for returns and customer incentives 341 413 Less: Allowance for doubtful accounts 78 84 Receivables, net $ 6,319 $ 6,302 Accumulated Other Comprehensive Income (Loss) (in millions) June 30, June 30, Unrealized gains (losses) on marketable securities $ (139 ) $ — Deferred gains (losses) on cash flow hedges 1 (13 ) Unrecognized gains (losses) on employee benefit obligations 118 3 Cumulative translation adjustments 76 105 Accumulated other comprehensive income (loss) $ 56 $ 95 Net Cash Provided by Operating Activities Six Months Ended (in millions) 2017 2016 Net income $ 2,561 $ 2,057 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 1,028 879 Equity in net (income) losses of investees, net 55 21 Cash received from investees 44 31 Net (gain) loss on investment activity and other (26 ) (92 ) Deferred income taxes 19 64 Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Current and noncurrent receivables, net (95 ) 145 Film and television costs, net 275 (179 ) Accounts payable and accrued expenses related to trade creditors (220 ) (185 ) Other operating assets and liabilities (115 ) (263 ) Net cash provided by operating activities $ 3,526 $ 2,478 Cash Payments for Interest and Income Taxes Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Interest $ 210 $ 219 $ 287 $ 285 Income taxes $ 97 $ 63 $ 149 $ 122 Noncash Investing and Financing Activities During the six months ended June 30, 2017 : • we acquired $294 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

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Redeemable Subsidiary Preferred Stock As of June 30, 2017 , the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $762 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 us with respect to non-infringement on one of the patents and granted summary judgment for Sprint on one of the patents as to infringement with respect to some but not all of our accused telecommunications systems but not as to the patent’s validity. In January 2017, the Court entered judgment in favor of us 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. In July 2017, Sprint filed a motion to amend the pre-trial order seeking to add an allegation that we willfully infringed Sprint’s patents and should be subject to increased damages, which could as much as triple the amount of any damages awarded. In July 2017, Sprint also filed a motion for partial summary judgment of certain of our defenses. 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 Segm

Financial Data by Business Segment	6 Months Ended
	Jun. 30, 2017
Segment Reporting Information [Line Items]
Financial Data by Business Segment	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. Our financial data by business segment is presented in the tables below. Three Months Ended June 30, 2017 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 13,122 $ 5,320 $ 2,001 $ 3,319 $ 1,956 $ 327 NBCUniversal Cable Networks 2,696 1,055 181 874 8 4 Broadcast Television 2,241 416 31 385 30 4 Filmed Entertainment 2,155 285 26 259 19 6 Theme Parks 1,314 551 186 365 243 26 Headquarters and Other (b) 9 (235 ) 96 (331 ) 38 33 Eliminations (c) (84 ) (1 ) — (1 ) — — NBCUniversal 8,331 2,071 520 1,551 338 73 Corporate and Other (d) 205 (302 ) 20 (322 ) 33 20 Eliminations (c) (493 ) 10 — 10 — — Comcast Consolidated $ 21,165 $ 7,099 $ 2,541 $ 4,558 $ 2,327 $ 420 Three Months Ended June 30, 2016 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 12,444 $ 5,048 $ 1,904 $ 3,144 $ 1,881 $ 289 NBCUniversal Cable Networks 2,566 944 187 757 7 3 Broadcast Television 2,128 394 30 364 30 3 Filmed Entertainment 1,351 56 12 44 5 3 Theme Parks 1,136 469 145 324 240 20 Headquarters and Other (b) 6 (175 ) 91 (266 ) 78 33 Eliminations (c) (84 ) 1 — 1 — — NBCUniversal 7,103 1,689 465 1,224 360 62 Corporate and Other (d) 180 (291 ) 20 (311 ) 30 8 Eliminations (c) (458 ) 9 — 9 — — Comcast Consolidated $ 19,269 $ 6,455 $ 2,389 $ 4,066 $ 2,271 $ 359 Six Months Ended June 30, 2017 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 26,034 $ 10,518 $ 3,981 $ 6,537 $ 3,737 $ 679 NBCUniversal Cable Networks 5,337 2,171 395 1,776 10 7 Broadcast Television 4,449 738 63 675 59 7 Filmed Entertainment 4,136 653 47 606 29 11 Theme Parks 2,432 948 328 620 472 39 Headquarters and Other (b) 17 (420 ) 195 (615 ) 53 64 Eliminations (c) (172 ) (2 ) — (2 ) — — NBCUniversal 16,199 4,088 1,028 3,060 623 128 Corporate and Other (d) 413 (496 ) 34 (530 ) 45 29 Eliminations (c) (1,018 ) 21 — 21 — — Comcast Consolidated $ 41,628 $ 14,131 $ 5,043 $ 9,088 $ 4,405 $ 836 Six Months Ended June 30, 2016 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 24,648 $ 9,937 $ 3,747 $ 6,190 $ 3,457 $ 613 NBCUniversal Cable Networks 5,019 1,900 377 1,523 8 4 Broadcast Television 4,212 678 62 616 49 6 Filmed Entertainment 2,734 223 20 203 8 6 Theme Parks 2,162 844 243 601 440 29 Headquarters and Other (b) 9 (335 ) 177 (512 ) 150 69 Eliminations (c) (172 ) 1 — 1 — — NBCUniversal 13,964 3,311 879 2,432 655 114 Corporate and Other (d) 379 (445 ) 41 (486 ) 44 10 Eliminations (c) (932 ) 19 — 19 — — Comcast Consolidated $ 38,059 $ 12,822 $ 4,667 $ 8,155 $ 4,156 $ 737 (a) For the three and six months ended June 30, 2017 and 2016 , Cable Communications segment revenue was derived from the following sources: Three Months Ended Six Months Ended 2017 2016 2017 2016 Residential: Video 44.2 % 44.9 % 44.4 % 45.1 % High-speed Internet 28.0 % 27.1 % 28.0 % 27.0 % Voice 6.5 % 7.2 % 6.6 % 7.3 % Business services 11.7 % 10.9 % 11.6 % 10.8 % Advertising 4.4 % 4.7 % 4.2 % 4.6 % Other 5.2 % 5.2 % 5.2 % 5.2 % Total 100.0 % 100.0 % 100.0 % 100.0 % Subscription revenue received from residential 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 and six months ended June 30, 2017 and 2016 , 2.8% 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 other business initiatives, 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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 7,099 $ 6,455 $ 14,131 $ 12,822 Depreciation (1,970 ) (1,868 ) (3,885 ) (3,653 ) Amortization (571 ) (521 ) (1,158 ) (1,014 ) Other income (expense) items, net (659 ) (708 ) (1,284 ) (1,262 ) Income before income taxes $ 3,899 $ 3,358 $ 7,804 $ 6,893
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Financial Data by Business Segment	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. Our financial data by business segment is presented in the tables below. Three Months Ended June 30, 2017 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 2,696 $ 1,055 $ 181 $ 874 $ 8 $ 4 Broadcast Television 2,241 416 31 385 30 4 Filmed Entertainment 2,155 285 26 259 19 6 Theme Parks 1,314 551 186 365 243 26 Headquarters and Other (a) 9 (235 ) 96 (331 ) 38 33 Eliminations (b) (84 ) (1 ) — (1 ) — — Total $ 8,331 $ 2,071 $ 520 $ 1,551 $ 338 $ 73 Three Months Ended June 30, 2016 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 2,566 $ 944 $ 187 $ 757 $ 7 $ 3 Broadcast Television 2,128 394 30 364 30 3 Filmed Entertainment 1,351 56 12 44 5 3 Theme Parks 1,136 469 145 324 240 20 Headquarters and Other (a) 6 (175 ) 91 (266 ) 78 33 Eliminations (b) (84 ) 1 — 1 — — Total $ 7,103 $ 1,689 $ 465 $ 1,224 $ 360 $ 62 Six Months Ended June 30, 2017 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 5,337 $ 2,171 $ 395 $ 1,776 $ 10 $ 7 Broadcast Television 4,449 738 63 675 59 7 Filmed Entertainment 4,136 653 47 606 29 11 Theme Parks 2,432 948 328 620 472 39 Headquarters and Other (a) 17 (420 ) 195 (615 ) 53 64 Eliminations (b) (172 ) (2 ) — (2 ) — — Total $ 16,199 $ 4,088 $ 1,028 $ 3,060 $ 623 $ 128 Six Months Ended June 30, 2016 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 5,019 $ 1,900 $ 377 $ 1,523 $ 8 $ 4 Broadcast Television 4,212 678 62 616 49 6 Filmed Entertainment 2,734 223 20 203 8 6 Theme Parks 2,162 844 243 601 440 29 Headquarters and Other (a) 9 (335 ) 177 (512 ) 150 69 Eliminations (b) (172 ) 1 — 1 — — Total $ 13,964 $ 3,311 $ 879 $ 2,432 $ 655 $ 114 (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 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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 2,071 $ 1,689 $ 4,088 $ 3,311 Depreciation (265 ) (223 ) (496 ) (415 ) Amortization (255 ) (242 ) (532 ) (464 ) Other income (expense) items, net (164 ) (175 ) (308 ) (203 ) Income before income taxes $ 1,387 $ 1,049 $ 2,752 $ 2,229

Condensed Consolidating Financi

Condensed Consolidating Financial Information	6 Months Ended
	Jun. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Information	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 $4.8 billion aggregate principal amount of senior notes, $1.5 billion 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 . Comcast Parent also provides an unconditional guarantee of the Universal Studios Japan ¥450 billion term loan with a final maturity of March 2022. 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 . Condensed Consolidating Balance Sheet June 30, 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 $ — $ — $ — $ 310 $ 2,383 $ — $ 2,693 Receivables, net — — — — 7,849 — 7,849 Programming rights — — — — 1,633 — 1,633 Other current assets 67 — — 21 2,569 — 2,657 Total current assets 67 — — 331 14,434 — 14,832 Film and television costs — — — — 6,595 — 6,595 Investments 96 1 15 690 5,719 — 6,521 Investments in and amounts due from subsidiaries eliminated upon consolidation 101,430 126,187 124,549 49,038 110,545 (511,749 ) — Property and equipment, net 434 — — — 36,737 — 37,171 Franchise rights — — — — 59,364 — 59,364 Goodwill — — — — 36,742 — 36,742 Other intangible assets, net 11 — — — 18,896 — 18,907 Other noncurrent assets, net 1,149 658 — 83 2,035 (1,026 ) 2,899 Total assets $ 103,187 $ 126,846 $ 124,564 $ 50,142 $ 291,067 $ (512,775 ) $ 183,031 Liabilities and Equity Accounts payable and accrued expenses related to trade creditors $ 12 $ — $ — $ — $ 6,718 $ — $ 6,730 Accrued participations and residuals — — — — 1,882 — 1,882 Accrued expenses and other current liabilities 1,887 92 295 286 4,746 — 7,306 Current portion of long-term debt 4,032 — — 4 2,322 — 6,358 Total current liabilities 5,931 92 295 290 15,668 — 22,276 Long-term debt, less current portion 39,725 142 2,100 8,204 7,039 — 57,210 Deferred income taxes — 508 — 70 35,886 (1,055 ) 35,409 Other noncurrent liabilities 2,526 — — 1,111 7,171 29 10,837 Redeemable noncontrolling interests and redeemable subsidiary preferred stock — — — — 1,451 — 1,451 Equity: Common stock 56 — — — — — 56 Other shareholders’ equity 54,949 126,104 122,169 40,467 223,009 (511,749 ) 54,949 Total Comcast Corporation shareholders’ equity 55,005 126,104 122,169 40,467 223,009 (511,749 ) 55,005 Noncontrolling interests — — — — 843 — 843 Total equity 55,005 126,104 122,169 40,467 223,852 (511,749 ) 55,848 Total liabilities and equity $ 103,187 $ 126,846 $ 124,564 $ 50,142 $ 291,067 $ (512,775 ) $ 183,031 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 June 30, 2017 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 21,165 $ — $ 21,165 Management fee revenue 281 — 277 — — (558 ) — 281 — 277 — 21,165 (558 ) 21,165 Costs and Expenses: Programming and production — — — — 6,341 — 6,341 Other operating and administrative 200 — 277 261 5,880 (558 ) 6,060 Advertising, marketing and promotion — — — — 1,665 — 1,665 Depreciation 7 — — — 1,963 — 1,970 Amortization 1 — — — 570 — 571 208 — 277 261 16,419 (558 ) 16,607 Operating income (loss) 73 — — (261 ) 4,746 — 4,558 Other Income (Expense): Interest expense (531 ) (3 ) (51 ) (116 ) (57 ) — (758 ) Investment income (loss), net — 24 — (16 ) 56 — 64 Equity in net income (losses) of investees, net 2,811 2,613 2,301 1,659 1,291 (10,660 ) 15 Other income (expense), net — — — 18 2 — 20 2,280 2,634 2,250 1,545 1,292 (10,660 ) (659 ) Income (loss) before income taxes 2,353 2,634 2,250 1,284 6,038 (10,660 ) 3,899 Income tax (expense) benefit 160 (7 ) 18 (8 ) (1,527 ) — (1,364 ) Net income (loss) 2,513 2,627 2,268 1,276 4,511 (10,660 ) 2,535 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (22 ) — (22 ) Net income (loss) attributable to Comcast Corporation $ 2,513 $ 2,627 $ 2,268 $ 1,276 $ 4,489 $ (10,660 ) $ 2,513 Comprehensive income (loss) attributable to Comcast Corporation $ 2,405 $ 2,591 $ 2,269 $ 1,120 $ 4,246 $ (10,226 ) $ 2,405 Condensed Consolidating Statement of Income For the Three Months Ended June 30, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 19,269 $ — $ 19,269 Management fee revenue 266 — 261 — — (527 ) — 266 — 261 — 19,269 (527 ) 19,269 Costs and Expenses: Programming and production — — — — 5,492 — 5,492 Other operating and administrative 285 — 261 222 5,522 (527 ) 5,763 Advertising, marketing and promotion — — — — 1,559 — 1,559 Depreciation 6 — — — 1,862 — 1,868 Amortization 2 — — — 519 — 521 293 — 261 222 14,954 (527 ) 15,203 Operating income (loss) (27 ) — — (222 ) 4,315 — 4,066 Other Income (Expense): Interest expense (478 ) (3 ) (61 ) (112 ) (78 ) — (732 ) Investment income (loss), net 3 1 — (6 ) 60 — 58 Equity in net income (losses) of investees, net 2,354 2,275 2,127 1,288 914 (8,977 ) (19 ) Other income (expense), net — — — (7 ) (8 ) — (15 ) 1,879 2,273 2,066 1,163 888 (8,977 ) (708 ) Income (loss) before income taxes 1,852 2,273 2,066 941 5,203 (8,977 ) 3,358 Income tax (expense) benefit 176 1 21 (8 ) (1,468 ) — (1,278 ) Net income (loss) 2,028 2,274 2,087 933 3,735 (8,977 ) 2,080 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (52 ) — (52 ) Net income (loss) attributable to Comcast Corporation $ 2,028 $ 2,274 $ 2,087 $ 933 $ 3,683 $ (8,977 ) $ 2,028 Comprehensive income (loss) attributable to Comcast Corporation $ 2,113 $ 2,321 $ 2,087 $ 1,096 $ 4,194 $ (9,698 ) $ 2,113 Condensed Consolidating Statement of Income For the Six Months Ended June 30, 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 $ — $ — $ — $ — $ 41,628 $ — $ 41,628 Management fee revenue 556 — 547 — — (1,103 ) — 556 — 547 — 41,628 (1,103 ) 41,628 Costs and Expenses: Programming and production — — — — 12,415 — 12,415 Other operating and administrative 370 — 547 567 11,506 (1,103 ) 11,887 Advertising, marketing and promotion — — — — 3,195 — 3,195 Depreciation 14 — — — 3,871 — 3,885 Amortization 3 — — — 1,155 — 1,158 387 — 547 567 32,142 (1,103 ) 32,540 Operating income (loss) 169 — — (567 ) 9,486 — 9,088 Other Income (Expense): Interest expense (1,048 ) (6 ) (111 ) (228 ) (120 ) — (1,513 ) Investment income (loss), net 1 52 — (20 ) 90 — 123 Equity in net income (losses) of investees, net 5,650 5,263 4,621 3,256 2,527 (21,266 ) 51 Other income (expense), net — — — 46 9 — 55 4,603 5,309 4,510 3,054 2,506 (21,266 ) (1,284 ) Income (loss) before income taxes 4,772 5,309 4,510 2,487 11,992 (21,266 ) 7,804 Income tax (expense) benefit 307 (16 ) 39 (11 ) (2,941 ) — (2,622 ) Net income (loss) 5,079 5,293 4,549 2,476 9,051 (21,266 ) 5,182 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (103 ) — (103 ) Net income (loss) attributable to Comcast Corporation $ 5,079 $ 5,293 $ 4,549 $ 2,476 $ 8,948 $ (21,266 ) $ 5,079 Comprehensive income (loss) attributable to Comcast Corporation $ 5,215 $ 5,307 $ 4,551 $ 2,526 $ 8,949 $ (21,333 ) $ 5,215 Condensed Consolidating Statement of Income For the Six Months Ended June 30, 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 $ — $ — $ — $ — $ 38,059 $ — $ 38,059 Management fee revenue 525 — 515 — — (1,040 ) — 525 — 515 — 38,059 (1,040 ) 38,059 Costs and Expenses: Programming and production — — — — 10,923 — 10,923 Other operating and administrative 441 — 515 517 10,856 (1,040 ) 11,289 Advertising, marketing and promotion — — — — 3,025 — 3,025 Depreciation 14 — — — 3,639 — 3,653 Amortization 3 — — — 1,011 — 1,014 458 — 515 517 29,454 (1,040 ) 29,904 Operating income (loss) 67 — — (517 ) 8,605 — 8,155 Other Income (Expense): Interest expense (929 ) (6 ) (120 ) (229 ) (151 ) — (1,435 ) Investment income (loss), net 3 1 — (8 ) 92 — 88 Equity in net income (losses) of investees, net 4,720 4,539 4,241 2,585 1,905 (18,020 ) (30 ) Other income (expense), net — — — 117 (2 ) — 115 3,794 4,534 4,121 2,465 1,844 (18,020 ) (1,262 ) Income (loss) before income taxes 3,861 4,534 4,121 1,948 10,449 (18,020 ) 6,893 Income tax (expense) benefit 301 2 42 (13 ) (2,921 ) — (2,589 ) Net income (loss) 4,162 4,536 4,163 1,935 7,528 (18,020 ) 4,304 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (142 ) — (142 ) Net income (loss) attributable to Comcast Corporation $ 4,162 $ 4,536 $ 4,163 $ 1,935 $ 7,386 $ (18,020 ) $ 4,162 Comprehensive income (loss) attributable to Comcast Corporation $ 4,337 $ 4,627 $ 4,165 $ 2,242 $ 7,899 $ (18,933 ) $ 4,337 Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2017 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (465 ) $ 102 $ (116 ) $ (776 ) $ 12,069 $ — $ 10,814 Investing Activities Net transactions with affiliates 2,559 (102 ) 666 605 (3,728 ) — — Capital expenditures (3 ) — — — (4,402 ) — (4,405 ) Cash paid for intangible assets (2 ) — — — (834 ) — (836 ) Acquisitions and construction of real estate properties (143 ) — — — (107 ) — (250 ) Acquisitions, net of cash acquired — — — — (398 ) — (398 ) Proceeds from sales of investments — — — 10 47 — 57 Purchases of investments (20 ) — — (57 ) (1,748 ) — (1,825 ) Other 101 — — 49 20 — 170 Net cash provided by (used in) investing activities 2,492 (102 ) 666 607 (11,150 ) — (7,487 ) Financing Activities Proceeds from (repayments of) short-term borrowings, net (627 ) — — — (1,068 ) — (1,695 ) Proceeds from borrowings 3,500 — — — 5,463 — 8,963 Repurchases and repayments of debt (1,000 ) — (550 ) (3 ) (3,414 ) — (4,967 ) Repurchases of common stock under repurchase program and employee plans (2,476 ) — — — — — (2,476 ) Dividends paid (1,404 ) — — — — — (1,404 ) Purchase of Universal Studios Japan noncontrolling interests — — — — (2,299 ) — (2,299 ) Issuances of common stock — — — — — — — Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (137 ) — (137 ) Other (20 ) — — — 100 — 80 Net cash provided by (used in) financing activities (2,027 ) — (550 ) (3 ) (1,355 ) — (3,935 ) Increase (decrease) in cash and cash equivalents — — — (172 ) (436 ) — (608 ) Cash and cash equivalents, beginning of period — — — 482 2,819 — 3,301 Cash and cash equivalents, end of period $ — $ — $ — $ 310 $ 2,383 $ — $ 2,693 Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 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 $ (367 ) $ — $ (84 ) $ (809 ) $ 11,054 $ — $ 9,794 Investing Activities Net transactions with affiliates 880 — 84 1,579 (2,543 ) — — Capital expenditures (7 ) — — — (4,149 ) — (4,156 ) Cash paid for intangible assets (3 ) — — — (734 ) — (737 ) Acquisitions and construction of real estate properties — — — — (211 ) — (211 ) Acquisitions, net of cash acquired — — — — (126 ) — (126 ) Proceeds from sales of investments — — — 102 36 — 138 Purchases of investments (15 ) — — (2 ) (563 ) — (580 ) Other (164 ) — — (35 ) 43 — (156 ) Net cash provided by (used in) investing activities 691 — 84 1,644 (8,247 ) — (5,828 ) Financing Activities Proceeds from (repayments of) short-term borrowings, net (400 ) — — — 605 — 205 Proceeds from borrowings 4,753 — — — — — 4,753 Repurchases and repayments of debt (750 ) — — (1,004 ) (797 ) — (2,551 ) Repurchases of common stock under repurchase program and employee plans (2,636 ) — — — — — (2,636 ) Dividends paid (1,281 ) — — — — — (1,281 ) Issuances of common stock 19 — — — — — 19 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (125 ) — (125 ) Other (29 ) — — 25 24 — 20 Net cash provided by (used in) financing activities (324 ) — — (979 ) (293 ) — (1,596 ) Increase (decrease) in cash and cash equivalents — — — (144 ) 2,514 — 2,370 Cash and cash equivalents, beginning of period — — — 414 1,881 — 2,295 Cash and cash equivalents, end of period $ — $ — $ — $ 270 $ 4,395 $ — $ 4,665

Recent Accounting Pronounceme22

Recent Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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 substantially completed the review of our revenue arrangements and do not currently expect that the adoption of the new standard will have a 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 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 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. In addition, upon adoption, we anticipate implementing certain changes in the presentation of revenue and expenses, including changes related to the allocation of revenue among the cable services included in a bundle that our residential customers purchase at a discount. The updated guidance also requires additional disclosures regarding the nature, timing and uncertainty of our revenue transactions. We intend to adopt the provisions of the guidance using the full retrospective method, under which we will adjust any prior periods presented to reflect the updated guidance. 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, primarily our investment in Snap Inc. (see Note 6), net income attributable to Comcast Corporation would have decreased for the three months ended June 30, 2017 by $88 million and increased for the six months ended June 30, 2017 by $16 million . 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 our condensed consolidated statement of income. The excess tax benefits resulted in a decrease to income tax expense of $59 million and $198 million for the three and six months ended June 30, 2017, respectively. In addition, the excess tax benefits resulted in an increase to diluted earnings per common share attributable to Comcast Corporation shareholders of $0.01 and $0.03 for the three and six months ended June 30, 2017 , respectively. As required by the updated guidance, the prior year periods in our condensed consolidated statement of income were 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 $543 million and $411 million for the six months ended June 30, 2017 and 2016, respectively.
NBCUniversal Media LLC [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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 substantially completed the review of our revenue arrangements and do not currently expect that the adoption of the new standard will have a 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 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 the nature, timing and uncertainty of our revenue transactions. We intend to adopt the provisions of the guidance using the full retrospective method, under which we will adjust any prior periods presented to reflect the updated guidance. 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, primarily our investment in Snap Inc. (see Note 6), net income attributable to NBCUniversal would have decreased for the three and six months ended June 30, 2017 by $140 million and $139 million , respectively. 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.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Computation of diluted EPS	Computation of Diluted EPS Three Months Ended June 30 2017 2016 (in millions, except per share data) Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 2,513 4,728 $ 0.53 $ 2,028 4,839 $ 0.42 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 81 52 Diluted EPS attributable to Comcast Corporation shareholders $ 2,513 4,809 $ 0.52 $ 2,028 4,891 $ 0.41 Six Months Ended June 30 2017 2016 (in millions, except per share amounts) Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 5,079 4,738 $ 1.07 $ 4,162 4,853 $ 0.86 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 82 55 Diluted EPS attributable to Comcast Corporation shareholders $ 5,079 4,820 $ 1.05 $ 4,162 4,908 $ 0.85

Significant Transactions (Table

Significant Transactions (Tables) - DreamWorks Animation [Member]	6 Months Ended
	Jun. 30, 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. Allocation of Purchase Price (in millions) Film and television costs $ 854 Intangible assets 396 Working capital 163 Debt (381 ) Tax receivable agreement (146 ) Deferred income taxes 301 Other noncurrent assets and liabilities 134 Identifiable net assets (liabilities) acquired 1,321 Noncontrolling interests (337 ) Goodwill 2,789 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. Allocation of Purchase Price (in millions) Film and television costs $ 854 Intangible assets 396 Working capital 163 Debt (381 ) Tax receivable agreement (a) (146 ) Other noncurrent assets and liabilities and other (b) 435 Identifiable net assets (liabilities) acquired 1,321 Noncontrolling interests (337 ) Goodwill 2,789 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 $289 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.

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 2017
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Related Party Transactions Condensed Financial Statements	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) June 30, December 31, Transactions with Comcast and Consolidated Subsidiaries Receivables, net $ 324 $ 285 Accounts payable and accrued expenses related to trade creditors $ 39 $ 55 Accrued expenses and other current liabilities $ 26 $ 4 Note payable to Comcast $ 2,981 $ 2,703 Other noncurrent liabilities $ 389 $ 389 Condensed Consolidated Statement of Income Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Transactions with Comcast and Consolidated Subsidiaries Revenue $ 460 $ 406 $ 919 $ 813 Operating costs and expenses $ (49 ) $ (44 ) $ (110 ) $ (104 ) Other income (expense) $ (28 ) $ (17 ) $ (47 ) $ (30 )

Film and Television Costs (Tabl

Film and Television Costs (Tables)	6 Months Ended
	Jun. 30, 2017
Film And Television Cost [Line Items]
Film and Television Costs	(in millions) June 30, December 31, Film Costs: Released, less amortization $ 1,949 $ 1,750 Completed, not released 93 50 In production and in development 813 1,310 2,855 3,110 Television Costs: Released, less amortization 1,888 1,953 In production and in development 751 853 2,639 2,806 Programming rights, less amortization 2,734 2,586 8,228 8,502 Less: Current portion of programming rights 1,633 1,250 Film and television costs $ 6,595 $ 7,252
NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Film and Television Costs	(in millions) June 30, December 31, Film Costs: Released, less amortization $ 1,949 $ 1,750 Completed, not released 93 50 In production and in development 813 1,310 2,855 3,110 Television Costs: Released, less amortization 1,888 1,953 In production and in development 751 853 2,639 2,806 Programming rights, less amortization 2,721 2,570 8,215 8,486 Less: Current portion of programming rights 1,625 1,241 Film and television costs $ 6,590 $ 7,245

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value, Equity And Cost Method Investments [Line Items]
Investment Summary	(in millions) June 30, December 31, Fair Value Method: Snap $ 522 $ — Other 163 198 685 198 Equity Method: Atairos 2,233 1,601 Hulu 218 225 Other 653 550 3,104 2,376 Cost Method: AirTouch 1,606 1,599 BuzzFeed 400 400 Other 759 771 2,765 2,770 Total investments 6,554 5,344 Less: Current investments 33 97 Noncurrent investments $ 6,521 $ 5,247
Investment Income (Loss), Net	Investment Income (Loss), Net Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Gains (losses) on sales and exchanges of investments, net $ — $ 13 $ (1 ) $ 15 Investment impairment losses (2 ) (1 ) (6 ) (21 ) Interest and dividend income 32 31 65 60 Other, net 34 15 65 34 Investment income (loss), net $ 64 $ 58 $ 123 $ 88
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Investment Summary	(in millions) June 30, December 31, Fair Value Method: Snap $ 522 $ — Other 3 6 525 6 Equity Method: Hulu 218 225 Other 415 336 633 561 Cost Method: BuzzFeed 400 400 Other 351 296 751 696 Total investments 1,909 1,263 Less: Current investments 19 — Noncurrent investments $ 1,890 $ 1,263

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended (in millions) 2017 2016 2017 2016 Restricted share units $ 111 $ 89 $ 185 $ 159 Stock options 63 48 103 85 Employee stock purchase plans 7 8 17 16 Total $ 181 $ 145 $ 305 $ 260
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 Six Months Ended (in millions) 2017 2016 2017 2016 Restricted share units $ 34 $ 27 $ 54 $ 45 Stock options 5 2 7 4 Employee stock purchase plans 1 2 4 5 Total $ 40 $ 31 $ 65 $ 54

Supplemental Financial Inform29

Supplemental Financial Information (Tables)	6 Months Ended
	Jun. 30, 2017
Supplemental Financial Information [Line Items]
Schedule of receivables, net	Receivables (in millions) June 30, December 31, Receivables, gross $ 8,459 $ 8,622 Less: Allowance for returns and customer incentives 345 417 Less: Allowance for doubtful accounts 265 250 Receivables, net $ 7,849 $ 7,955
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) (in millions) June 30, June 30, Unrealized gains (losses) on marketable securities $ 17 $ 3 Deferred gains (losses) on cash flow hedges (16 ) (75 ) Unrecognized gains (losses) on employee benefit obligations 276 8 Cumulative translation adjustments 151 65 Accumulated other comprehensive income (loss), net of deferred taxes $ 428 $ 1
Schedule of adjustments to reconcile net income to net cash provided by operating activities	Net Cash Provided by Operating Activities Six Months Ended (in millions) 2017 2016 Net income $ 5,182 $ 4,304 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 5,043 4,667 Share-based compensation 391 331 Noncash interest expense (income), net 122 113 Equity in net (income) losses of investees, net (51 ) 30 Cash received from investees 49 42 Net (gain) loss on investment activity and other (110 ) (126 ) Deferred income taxes 470 618 Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Current and noncurrent receivables, net 18 172 Film and television costs, net 277 (171 ) Accounts payable and accrued expenses related to trade creditors (144 ) (104 ) Other operating assets and liabilities (433 ) (82 ) Net cash provided by operating activities $ 10,814 $ 9,794
Schedule of cash payments for interest and income taxes	Cash Payments for Interest and Income Taxes Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Interest $ 477 $ 512 $ 1,372 $ 1,235 Income taxes $ 2,077 $ 1,495 $ 2,209 $ 1,685
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Schedule of receivables, net	Receivables (in millions) June 30, December 31, Receivables, gross $ 6,738 $ 6,799 Less: Allowance for returns and customer incentives 341 413 Less: Allowance for doubtful accounts 78 84 Receivables, net $ 6,319 $ 6,302
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) (in millions) June 30, June 30, Unrealized gains (losses) on marketable securities $ (139 ) $ — Deferred gains (losses) on cash flow hedges 1 (13 ) Unrecognized gains (losses) on employee benefit obligations 118 3 Cumulative translation adjustments 76 105 Accumulated other comprehensive income (loss) $ 56 $ 95
Schedule of adjustments to reconcile net income to net cash provided by operating activities	Net Cash Provided by Operating Activities Six Months Ended (in millions) 2017 2016 Net income $ 2,561 $ 2,057 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 1,028 879 Equity in net (income) losses of investees, net 55 21 Cash received from investees 44 31 Net (gain) loss on investment activity and other (26 ) (92 ) Deferred income taxes 19 64 Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Current and noncurrent receivables, net (95 ) 145 Film and television costs, net 275 (179 ) Accounts payable and accrued expenses related to trade creditors (220 ) (185 ) Other operating assets and liabilities (115 ) (263 ) Net cash provided by operating activities $ 3,526 $ 2,478
Schedule of cash payments for interest and income taxes	Cash Payments for Interest and Income Taxes Three Months Ended Six Months Ended (in millions) 2017 2016 2017 2016 Interest $ 210 $ 219 $ 287 $ 285 Income taxes $ 97 $ 63 $ 149 $ 122

Financial Data by Business Se30

Financial Data by Business Segment (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting Information [Line Items]
Financial Data by Business Segment	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. Our financial data by business segment is presented in the tables below. Three Months Ended June 30, 2017 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 13,122 $ 5,320 $ 2,001 $ 3,319 $ 1,956 $ 327 NBCUniversal Cable Networks 2,696 1,055 181 874 8 4 Broadcast Television 2,241 416 31 385 30 4 Filmed Entertainment 2,155 285 26 259 19 6 Theme Parks 1,314 551 186 365 243 26 Headquarters and Other (b) 9 (235 ) 96 (331 ) 38 33 Eliminations (c) (84 ) (1 ) — (1 ) — — NBCUniversal 8,331 2,071 520 1,551 338 73 Corporate and Other (d) 205 (302 ) 20 (322 ) 33 20 Eliminations (c) (493 ) 10 — 10 — — Comcast Consolidated $ 21,165 $ 7,099 $ 2,541 $ 4,558 $ 2,327 $ 420 Three Months Ended June 30, 2016 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 12,444 $ 5,048 $ 1,904 $ 3,144 $ 1,881 $ 289 NBCUniversal Cable Networks 2,566 944 187 757 7 3 Broadcast Television 2,128 394 30 364 30 3 Filmed Entertainment 1,351 56 12 44 5 3 Theme Parks 1,136 469 145 324 240 20 Headquarters and Other (b) 6 (175 ) 91 (266 ) 78 33 Eliminations (c) (84 ) 1 — 1 — — NBCUniversal 7,103 1,689 465 1,224 360 62 Corporate and Other (d) 180 (291 ) 20 (311 ) 30 8 Eliminations (c) (458 ) 9 — 9 — — Comcast Consolidated $ 19,269 $ 6,455 $ 2,389 $ 4,066 $ 2,271 $ 359 Six Months Ended June 30, 2017 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 26,034 $ 10,518 $ 3,981 $ 6,537 $ 3,737 $ 679 NBCUniversal Cable Networks 5,337 2,171 395 1,776 10 7 Broadcast Television 4,449 738 63 675 59 7 Filmed Entertainment 4,136 653 47 606 29 11 Theme Parks 2,432 948 328 620 472 39 Headquarters and Other (b) 17 (420 ) 195 (615 ) 53 64 Eliminations (c) (172 ) (2 ) — (2 ) — — NBCUniversal 16,199 4,088 1,028 3,060 623 128 Corporate and Other (d) 413 (496 ) 34 (530 ) 45 29 Eliminations (c) (1,018 ) 21 — 21 — — Comcast Consolidated $ 41,628 $ 14,131 $ 5,043 $ 9,088 $ 4,405 $ 836 Six Months Ended June 30, 2016 (in millions) Revenue (e) Adjusted EBITDA (f) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Communications (a) $ 24,648 $ 9,937 $ 3,747 $ 6,190 $ 3,457 $ 613 NBCUniversal Cable Networks 5,019 1,900 377 1,523 8 4 Broadcast Television 4,212 678 62 616 49 6 Filmed Entertainment 2,734 223 20 203 8 6 Theme Parks 2,162 844 243 601 440 29 Headquarters and Other (b) 9 (335 ) 177 (512 ) 150 69 Eliminations (c) (172 ) 1 — 1 — — NBCUniversal 13,964 3,311 879 2,432 655 114 Corporate and Other (d) 379 (445 ) 41 (486 ) 44 10 Eliminations (c) (932 ) 19 — 19 — — Comcast Consolidated $ 38,059 $ 12,822 $ 4,667 $ 8,155 $ 4,156 $ 737 (a) For the three and six months ended June 30, 2017 and 2016 , Cable Communications segment revenue was derived from the following sources: Three Months Ended Six Months Ended 2017 2016 2017 2016 Residential: Video 44.2 % 44.9 % 44.4 % 45.1 % High-speed Internet 28.0 % 27.1 % 28.0 % 27.0 % Voice 6.5 % 7.2 % 6.6 % 7.3 % Business services 11.7 % 10.9 % 11.6 % 10.8 % Advertising 4.4 % 4.7 % 4.2 % 4.6 % Other 5.2 % 5.2 % 5.2 % 5.2 % Total 100.0 % 100.0 % 100.0 % 100.0 % Subscription revenue received from residential 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 and six months ended June 30, 2017 and 2016 , 2.8% 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 other business initiatives, 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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 7,099 $ 6,455 $ 14,131 $ 12,822 Depreciation (1,970 ) (1,868 ) (3,885 ) (3,653 ) Amortization (571 ) (521 ) (1,158 ) (1,014 ) Other income (expense) items, net (659 ) (708 ) (1,284 ) (1,262 ) Income before income taxes $ 3,899 $ 3,358 $ 7,804 $ 6,893
Cable Communications Segment Revenue Sources	For the three and six months ended June 30, 2017 and 2016 , Cable Communications segment revenue was derived from the following sources: Three Months Ended Six Months Ended 2017 2016 2017 2016 Residential: Video 44.2 % 44.9 % 44.4 % 45.1 % High-speed Internet 28.0 % 27.1 % 28.0 % 27.0 % Voice 6.5 % 7.2 % 6.6 % 7.3 % Business services 11.7 % 10.9 % 11.6 % 10.8 % Advertising 4.4 % 4.7 % 4.2 % 4.6 % Other 5.2 % 5.2 % 5.2 % 5.2 % Total 100.0 % 100.0 % 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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 7,099 $ 6,455 $ 14,131 $ 12,822 Depreciation (1,970 ) (1,868 ) (3,885 ) (3,653 ) Amortization (571 ) (521 ) (1,158 ) (1,014 ) Other income (expense) items, net (659 ) (708 ) (1,284 ) (1,262 ) Income before income taxes $ 3,899 $ 3,358 $ 7,804 $ 6,893
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Financial Data by Business Segment	Our financial data by business segment is presented in the tables below. Three Months Ended June 30, 2017 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 2,696 $ 1,055 $ 181 $ 874 $ 8 $ 4 Broadcast Television 2,241 416 31 385 30 4 Filmed Entertainment 2,155 285 26 259 19 6 Theme Parks 1,314 551 186 365 243 26 Headquarters and Other (a) 9 (235 ) 96 (331 ) 38 33 Eliminations (b) (84 ) (1 ) — (1 ) — — Total $ 8,331 $ 2,071 $ 520 $ 1,551 $ 338 $ 73 Three Months Ended June 30, 2016 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 2,566 $ 944 $ 187 $ 757 $ 7 $ 3 Broadcast Television 2,128 394 30 364 30 3 Filmed Entertainment 1,351 56 12 44 5 3 Theme Parks 1,136 469 145 324 240 20 Headquarters and Other (a) 6 (175 ) 91 (266 ) 78 33 Eliminations (b) (84 ) 1 — 1 — — Total $ 7,103 $ 1,689 $ 465 $ 1,224 $ 360 $ 62 Six Months Ended June 30, 2017 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 5,337 $ 2,171 $ 395 $ 1,776 $ 10 $ 7 Broadcast Television 4,449 738 63 675 59 7 Filmed Entertainment 4,136 653 47 606 29 11 Theme Parks 2,432 948 328 620 472 39 Headquarters and Other (a) 17 (420 ) 195 (615 ) 53 64 Eliminations (b) (172 ) (2 ) — (2 ) — — Total $ 16,199 $ 4,088 $ 1,028 $ 3,060 $ 623 $ 128 Six Months Ended June 30, 2016 (in millions) Revenue (c) Adjusted EBITDA (d) Depreciation and Amortization Operating Income (Loss) Capital Expenditures Cash Paid for Intangible Assets Cable Networks $ 5,019 $ 1,900 $ 377 $ 1,523 $ 8 $ 4 Broadcast Television 4,212 678 62 616 49 6 Filmed Entertainment 2,734 223 20 203 8 6 Theme Parks 2,162 844 243 601 440 29 Headquarters and Other (a) 9 (335 ) 177 (512 ) 150 69 Eliminations (b) (172 ) 1 — 1 — — Total $ 13,964 $ 3,311 $ 879 $ 2,432 $ 655 $ 114 (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 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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 2,071 $ 1,689 $ 4,088 $ 3,311 Depreciation (265 ) (223 ) (496 ) (415 ) Amortization (255 ) (242 ) (532 ) (464 ) Other income (expense) items, net (164 ) (175 ) (308 ) (203 ) Income before income taxes $ 1,387 $ 1,049 $ 2,752 $ 2,229
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 Six Months Ended (in millions) 2017 2016 2017 2016 Adjusted EBITDA $ 2,071 $ 1,689 $ 4,088 $ 3,311 Depreciation (265 ) (223 ) (496 ) (415 ) Amortization (255 ) (242 ) (532 ) (464 ) Other income (expense) items, net (164 ) (175 ) (308 ) (203 ) Income before income taxes $ 1,387 $ 1,049 $ 2,752 $ 2,229

Condensed Consolidating Finan31

Condensed Consolidating Financial Information (Tables)	6 Months Ended
	Jun. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Statements	Condensed Consolidating Balance Sheet June 30, 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 $ — $ — $ — $ 310 $ 2,383 $ — $ 2,693 Receivables, net — — — — 7,849 — 7,849 Programming rights — — — — 1,633 — 1,633 Other current assets 67 — — 21 2,569 — 2,657 Total current assets 67 — — 331 14,434 — 14,832 Film and television costs — — — — 6,595 — 6,595 Investments 96 1 15 690 5,719 — 6,521 Investments in and amounts due from subsidiaries eliminated upon consolidation 101,430 126,187 124,549 49,038 110,545 (511,749 ) — Property and equipment, net 434 — — — 36,737 — 37,171 Franchise rights — — — — 59,364 — 59,364 Goodwill — — — — 36,742 — 36,742 Other intangible assets, net 11 — — — 18,896 — 18,907 Other noncurrent assets, net 1,149 658 — 83 2,035 (1,026 ) 2,899 Total assets $ 103,187 $ 126,846 $ 124,564 $ 50,142 $ 291,067 $ (512,775 ) $ 183,031 Liabilities and Equity Accounts payable and accrued expenses related to trade creditors $ 12 $ — $ — $ — $ 6,718 $ — $ 6,730 Accrued participations and residuals — — — — 1,882 — 1,882 Accrued expenses and other current liabilities 1,887 92 295 286 4,746 — 7,306 Current portion of long-term debt 4,032 — — 4 2,322 — 6,358 Total current liabilities 5,931 92 295 290 15,668 — 22,276 Long-term debt, less current portion 39,725 142 2,100 8,204 7,039 — 57,210 Deferred income taxes — 508 — 70 35,886 (1,055 ) 35,409 Other noncurrent liabilities 2,526 — — 1,111 7,171 29 10,837 Redeemable noncontrolling interests and redeemable subsidiary preferred stock — — — — 1,451 — 1,451 Equity: Common stock 56 — — — — — 56 Other shareholders’ equity 54,949 126,104 122,169 40,467 223,009 (511,749 ) 54,949 Total Comcast Corporation shareholders’ equity 55,005 126,104 122,169 40,467 223,009 (511,749 ) 55,005 Noncontrolling interests — — — — 843 — 843 Total equity 55,005 126,104 122,169 40,467 223,852 (511,749 ) 55,848 Total liabilities and equity $ 103,187 $ 126,846 $ 124,564 $ 50,142 $ 291,067 $ (512,775 ) $ 183,031 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 June 30, 2017 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 21,165 $ — $ 21,165 Management fee revenue 281 — 277 — — (558 ) — 281 — 277 — 21,165 (558 ) 21,165 Costs and Expenses: Programming and production — — — — 6,341 — 6,341 Other operating and administrative 200 — 277 261 5,880 (558 ) 6,060 Advertising, marketing and promotion — — — — 1,665 — 1,665 Depreciation 7 — — — 1,963 — 1,970 Amortization 1 — — — 570 — 571 208 — 277 261 16,419 (558 ) 16,607 Operating income (loss) 73 — — (261 ) 4,746 — 4,558 Other Income (Expense): Interest expense (531 ) (3 ) (51 ) (116 ) (57 ) — (758 ) Investment income (loss), net — 24 — (16 ) 56 — 64 Equity in net income (losses) of investees, net 2,811 2,613 2,301 1,659 1,291 (10,660 ) 15 Other income (expense), net — — — 18 2 — 20 2,280 2,634 2,250 1,545 1,292 (10,660 ) (659 ) Income (loss) before income taxes 2,353 2,634 2,250 1,284 6,038 (10,660 ) 3,899 Income tax (expense) benefit 160 (7 ) 18 (8 ) (1,527 ) — (1,364 ) Net income (loss) 2,513 2,627 2,268 1,276 4,511 (10,660 ) 2,535 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (22 ) — (22 ) Net income (loss) attributable to Comcast Corporation $ 2,513 $ 2,627 $ 2,268 $ 1,276 $ 4,489 $ (10,660 ) $ 2,513 Comprehensive income (loss) attributable to Comcast Corporation $ 2,405 $ 2,591 $ 2,269 $ 1,120 $ 4,246 $ (10,226 ) $ 2,405 Condensed Consolidating Statement of Income For the Three Months Ended June 30, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 19,269 $ — $ 19,269 Management fee revenue 266 — 261 — — (527 ) — 266 — 261 — 19,269 (527 ) 19,269 Costs and Expenses: Programming and production — — — — 5,492 — 5,492 Other operating and administrative 285 — 261 222 5,522 (527 ) 5,763 Advertising, marketing and promotion — — — — 1,559 — 1,559 Depreciation 6 — — — 1,862 — 1,868 Amortization 2 — — — 519 — 521 293 — 261 222 14,954 (527 ) 15,203 Operating income (loss) (27 ) — — (222 ) 4,315 — 4,066 Other Income (Expense): Interest expense (478 ) (3 ) (61 ) (112 ) (78 ) — (732 ) Investment income (loss), net 3 1 — (6 ) 60 — 58 Equity in net income (losses) of investees, net 2,354 2,275 2,127 1,288 914 (8,977 ) (19 ) Other income (expense), net — — — (7 ) (8 ) — (15 ) 1,879 2,273 2,066 1,163 888 (8,977 ) (708 ) Income (loss) before income taxes 1,852 2,273 2,066 941 5,203 (8,977 ) 3,358 Income tax (expense) benefit 176 1 21 (8 ) (1,468 ) — (1,278 ) Net income (loss) 2,028 2,274 2,087 933 3,735 (8,977 ) 2,080 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (52 ) — (52 ) Net income (loss) attributable to Comcast Corporation $ 2,028 $ 2,274 $ 2,087 $ 933 $ 3,683 $ (8,977 ) $ 2,028 Comprehensive income (loss) attributable to Comcast Corporation $ 2,113 $ 2,321 $ 2,087 $ 1,096 $ 4,194 $ (9,698 ) $ 2,113 Condensed Consolidating Statement of Income For the Six Months Ended June 30, 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 $ — $ — $ — $ — $ 41,628 $ — $ 41,628 Management fee revenue 556 — 547 — — (1,103 ) — 556 — 547 — 41,628 (1,103 ) 41,628 Costs and Expenses: Programming and production — — — — 12,415 — 12,415 Other operating and administrative 370 — 547 567 11,506 (1,103 ) 11,887 Advertising, marketing and promotion — — — — 3,195 — 3,195 Depreciation 14 — — — 3,871 — 3,885 Amortization 3 — — — 1,155 — 1,158 387 — 547 567 32,142 (1,103 ) 32,540 Operating income (loss) 169 — — (567 ) 9,486 — 9,088 Other Income (Expense): Interest expense (1,048 ) (6 ) (111 ) (228 ) (120 ) — (1,513 ) Investment income (loss), net 1 52 — (20 ) 90 — 123 Equity in net income (losses) of investees, net 5,650 5,263 4,621 3,256 2,527 (21,266 ) 51 Other income (expense), net — — — 46 9 — 55 4,603 5,309 4,510 3,054 2,506 (21,266 ) (1,284 ) Income (loss) before income taxes 4,772 5,309 4,510 2,487 11,992 (21,266 ) 7,804 Income tax (expense) benefit 307 (16 ) 39 (11 ) (2,941 ) — (2,622 ) Net income (loss) 5,079 5,293 4,549 2,476 9,051 (21,266 ) 5,182 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (103 ) — (103 ) Net income (loss) attributable to Comcast Corporation $ 5,079 $ 5,293 $ 4,549 $ 2,476 $ 8,948 $ (21,266 ) $ 5,079 Comprehensive income (loss) attributable to Comcast Corporation $ 5,215 $ 5,307 $ 4,551 $ 2,526 $ 8,949 $ (21,333 ) $ 5,215 Condensed Consolidating Statement of Income For the Six Months Ended June 30, 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 $ — $ — $ — $ — $ 38,059 $ — $ 38,059 Management fee revenue 525 — 515 — — (1,040 ) — 525 — 515 — 38,059 (1,040 ) 38,059 Costs and Expenses: Programming and production — — — — 10,923 — 10,923 Other operating and administrative 441 — 515 517 10,856 (1,040 ) 11,289 Advertising, marketing and promotion — — — — 3,025 — 3,025 Depreciation 14 — — — 3,639 — 3,653 Amortization 3 — — — 1,011 — 1,014 458 — 515 517 29,454 (1,040 ) 29,904 Operating income (loss) 67 — — (517 ) 8,605 — 8,155 Other Income (Expense): Interest expense (929 ) (6 ) (120 ) (229 ) (151 ) — (1,435 ) Investment income (loss), net 3 1 — (8 ) 92 — 88 Equity in net income (losses) of investees, net 4,720 4,539 4,241 2,585 1,905 (18,020 ) (30 ) Other income (expense), net — — — 117 (2 ) — 115 3,794 4,534 4,121 2,465 1,844 (18,020 ) (1,262 ) Income (loss) before income taxes 3,861 4,534 4,121 1,948 10,449 (18,020 ) 6,893 Income tax (expense) benefit 301 2 42 (13 ) (2,921 ) — (2,589 ) Net income (loss) 4,162 4,536 4,163 1,935 7,528 (18,020 ) 4,304 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (142 ) — (142 ) Net income (loss) attributable to Comcast Corporation $ 4,162 $ 4,536 $ 4,163 $ 1,935 $ 7,386 $ (18,020 ) $ 4,162 Comprehensive income (loss) attributable to Comcast Corporation $ 4,337 $ 4,627 $ 4,165 $ 2,242 $ 7,899 $ (18,933 ) $ 4,337 Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 2017 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (465 ) $ 102 $ (116 ) $ (776 ) $ 12,069 $ — $ 10,814 Investing Activities Net transactions with affiliates 2,559 (102 ) 666 605 (3,728 ) — — Capital expenditures (3 ) — — — (4,402 ) — (4,405 ) Cash paid for intangible assets (2 ) — — — (834 ) — (836 ) Acquisitions and construction of real estate properties (143 ) — — — (107 ) — (250 ) Acquisitions, net of cash acquired — — — — (398 ) — (398 ) Proceeds from sales of investments — — — 10 47 — 57 Purchases of investments (20 ) — — (57 ) (1,748 ) — (1,825 ) Other 101 — — 49 20 — 170 Net cash provided by (used in) investing activities 2,492 (102 ) 666 607 (11,150 ) — (7,487 ) Financing Activities Proceeds from (repayments of) short-term borrowings, net (627 ) — — — (1,068 ) — (1,695 ) Proceeds from borrowings 3,500 — — — 5,463 — 8,963 Repurchases and repayments of debt (1,000 ) — (550 ) (3 ) (3,414 ) — (4,967 ) Repurchases of common stock under repurchase program and employee plans (2,476 ) — — — — — (2,476 ) Dividends paid (1,404 ) — — — — — (1,404 ) Purchase of Universal Studios Japan noncontrolling interests — — — — (2,299 ) — (2,299 ) Issuances of common stock — — — — — — — Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (137 ) — (137 ) Other (20 ) — — — 100 — 80 Net cash provided by (used in) financing activities (2,027 ) — (550 ) (3 ) (1,355 ) — (3,935 ) Increase (decrease) in cash and cash equivalents — — — (172 ) (436 ) — (608 ) Cash and cash equivalents, beginning of period — — — 482 2,819 — 3,301 Cash and cash equivalents, end of period $ — $ — $ — $ 310 $ 2,383 $ — $ 2,693 Condensed Consolidating Statement of Cash Flows For the Six Months Ended June 30, 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 $ (367 ) $ — $ (84 ) $ (809 ) $ 11,054 $ — $ 9,794 Investing Activities Net transactions with affiliates 880 — 84 1,579 (2,543 ) — — Capital expenditures (7 ) — — — (4,149 ) — (4,156 ) Cash paid for intangible assets (3 ) — — — (734 ) — (737 ) Acquisitions and construction of real estate properties — — — — (211 ) — (211 ) Acquisitions, net of cash acquired — — — — (126 ) — (126 ) Proceeds from sales of investments — — — 102 36 — 138 Purchases of investments (15 ) — — (2 ) (563 ) — (580 ) Other (164 ) — — (35 ) 43 — (156 ) Net cash provided by (used in) investing activities 691 — 84 1,644 (8,247 ) — (5,828 ) Financing Activities Proceeds from (repayments of) short-term borrowings, net (400 ) — — — 605 — 205 Proceeds from borrowings 4,753 — — — — — 4,753 Repurchases and repayments of debt (750 ) — — (1,004 ) (797 ) — (2,551 ) Repurchases of common stock under repurchase program and employee plans (2,636 ) — — — — — (2,636 ) Dividends paid (1,281 ) — — — — — (1,281 ) Issuances of common stock 19 — — — — — 19 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (125 ) — (125 ) Other (29 ) — — 25 24 — 20 Net cash provided by (used in) financing activities (324 ) — — (979 ) (293 ) — (1,596 ) Increase (decrease) in cash and cash equivalents — — — (144 ) 2,514 — 2,370 Cash and cash equivalents, beginning of period — — — 414 1,881 — 2,295 Cash and cash equivalents, end of period $ — $ — $ — $ 270 $ 4,395 $ — $ 4,665

Condensed Consolidated Financ32

Condensed Consolidated Financial Statements (Details)	Jan. 24, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stock split, conversion ratio	2

Recent Accounting Pronounceme33

Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		$ 10,814	$ 9,794
Net cash provided by (used in) financing activities		(3,935)	(1,596)
NBCUniversal Media LLC [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		3,526	2,478
Net cash provided by (used in) financing activities		(2,666)	(1,881)
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	$ (88)	16
Financial Assets and Financial Liabilities New Accounting Pronouncement [Member] | NBCUniversal Media LLC [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement impact on net income if adopted	(140)	(139)
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	$ 59	$ 198
Increase in diluted earnings per share (in dollars per share)	$ 0.01	$ 0.03
Net cash provided by operating activities		$ 543	411
Net cash provided by (used in) financing activities		$ (543)	$ (411)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to parent	$ 2,513	$ 2,028	$ 5,079	$ 4,162
Basic EPS attributable to Comcast Corporation shareholders (in shares)	4,728	4,839	4,738	4,853
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.53	$ 0.42	$ 1.07	$ 0.86
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Net income attributable to parent	$ 2,513	$ 2,028	$ 5,079	$ 4,162
Assumed exercise or issuance of shares relating to stock plans (in shares)	81	52	82	55
Diluted EPS attributable to Comcast Corporation shareholders (in shares)	4,809	4,891	4,820	4,908
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.52	$ 0.41	$ 1.05	$ 0.85

Significant Transactions (FCC S

Significant Transactions (FCC Spectrum Auction) (Details) - FCC Spectrum Auction [Member] - USD ($) $ in Millions	Sep. 30, 2016	Jul. 31, 2017	Apr. 13, 2017
FCC Spectrum Auction [Line Items]
Deposit to acquire intangible asset	$ 1,800
Amount of spectrum acquired			$ 1,700
Subsequent Event [Member]
FCC Spectrum Auction [Line Items]
Proceeds from FCC Spectrum Auction		$ 482
Subsequent Event [Member] | NBCUniversal Media LLC [Member]
FCC Spectrum Auction [Line Items]
Proceeds from FCC Spectrum Auction		$ 482

Significant Transaction (Univer

Significant Transaction (Universal Studios Japan) (Details) - USD ($) $ in Millions	Apr. 06, 2017	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest		$ 2,299	$ 0
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest		$ 2,299	$ 0
Universal Studios Japan [Member]
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest	$ 2,300
Universal Studios Japan [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Payments to acquire additional interest in noncontrolling interest	$ 2,300

Significant Transactions (Dream

Significant Transactions (DreamWorks Animation) (Details) - DreamWorks Animation [Member] $ / shares in Units, $ in Millions	Aug. 22, 2016USD ($)$ / shares
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,773
Business acquisition, price paid per share (in dollars per share) | $ / shares	$ 41
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,773
NBCUniversal Media LLC [Member] | Consideration Transferred By Comcast [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,800
Business acquisition, price paid per share (in dollars per share) | $ / shares	$ 41

Significant Transactions (Preli

Significant Transactions (Preliminary Allocation of Purchase Price) (Details) - USD ($) $ in Millions	Aug. 22, 2016	Jun. 30, 2017	Dec. 31, 2016
Allocation of Purchase Price
Goodwill		$ 36,742	$ 35,980
NBCUniversal Media LLC [Member]
Allocation of Purchase Price
Goodwill		23,946	$ 23,323
Contribution from member		$ 662
DreamWorks Animation [Member]
Allocation of Purchase Price
Film and television costs	$ 854
Intangible assets	396
Working capital	163
Debt	(381)
Tax receivable agreement	(146)
Deferred income taxes	301
Other noncurrent assets and liabilities	134
Identifiable net assets (liabilities) acquired	1,321
Noncontrolling interests	(337)
Goodwill	2,789
Cash consideration transferred by Comcast	3,773
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Allocation of Purchase Price
Film and television costs	854
Intangible assets	396
Working capital	163
Debt	(381)
Tax receivable agreement	(146)
Other noncurrent assets and liabilities	435
Identifiable net assets (liabilities) acquired	1,321
Noncontrolling interests	(337)
Goodwill	2,789
Cash consideration transferred by Comcast	3,773
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] | NBCUniversal Media LLC [Member]
Allocation of Purchase Price
Contribution from member	289
Tax Receivable Agreement [Member] | DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Allocation of Purchase Price
Contribution from member	$ 146

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Other noncurrent liabilities	$ 10,837	$ 10,925
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Other noncurrent liabilities	4,117	$ 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 (Con

Related Party Transactions (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Receivables, net	$ 7,849	$ 7,955
Accounts payable and accrued expenses related to trade creditors	6,730	6,915
Accrued expenses and other current liabilities	5,858	6,282
Other noncurrent liabilities	10,837	10,925
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	6,319	6,302
Accounts payable and accrued expenses related to trade creditors	1,490	1,647
Accrued expenses and other current liabilities	1,914	1,888
Note payable to Comcast	2,981	2,703
Other noncurrent liabilities	4,117	4,130
Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	324	285
Accounts payable and accrued expenses related to trade creditors	39	55
Accrued expenses and other current liabilities	26	4
Note payable to Comcast	2,981	2,703
Other noncurrent liabilities	$ 389	$ 389

Related Party Transactions (C41

Related Party Transactions (Condensed Consolidated Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Related Party Transaction [Line Items]
Revenue	$ 21,165	$ 19,269	$ 41,628	$ 38,059
Operating costs and expenses	659	708	1,284	1,262
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue	8,331	7,103	16,199	13,964
Operating costs and expenses	164	175	308	203
Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue	460	406	919	813
Operating costs and expenses	(49)	(44)	(110)	(104)
Other income (expense)	$ (28)	$ (17)	$ (47)	$ (30)

Film and Television Costs (Film

Film and Television Costs (Film and Television Costs)(Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Film Costs:
Released, less amortization	$ 1,949	$ 1,750
Completed, not released	93	50
In production and in development	813	1,310
Total film costs	2,855	3,110
Television Costs:
Released, less amortization	1,888	1,953
In production and in development	751	853
Total television costs	2,639	2,806
Programming rights, less amortization	2,734	2,586
Total film costs, television costs and programming rights	8,228	8,502
Less: Current portion of programming rights	1,633	1,250
Film and television costs	6,595	7,252
NBCUniversal Media LLC [Member]
Film Costs:
Released, less amortization	1,949	1,750
Completed, not released	93	50
In production and in development	813	1,310
Total film costs	2,855	3,110
Television Costs:
Released, less amortization	1,888	1,953
In production and in development	751	853
Total television costs	2,639	2,806
Programming rights, less amortization	2,721	2,570
Total film costs, television costs and programming rights	8,215	8,486
Less: Current portion of programming rights	1,625	1,241
Film and television costs	$ 6,590	$ 7,245

Investments (Schedule of Invest

Investments (Schedule of Investments) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	$ 685	$ 198
Equity method	3,104	2,376
Cost method	2,765	2,770
Total Investments	6,554	5,344
Less: Current investments	33	97
Noncurrent Investments	6,521	5,247
Snap [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	522	0
Other Fair Value Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	163	198
Atairos [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	2,233	1,601
Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	218	225
Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	653	550
AirTouch [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	1,606	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	759	771
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	525	6
Equity method	633	561
Cost method	751	696
Total Investments	1,909	1,263
Less: Current investments	19	0
Noncurrent Investments	1,890	1,263
NBCUniversal Media LLC [Member] | Snap [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	522	0
NBCUniversal Media LLC [Member] | Other Fair Value Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair value method	3	6
NBCUniversal Media LLC [Member] | Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	218	225
NBCUniversal Media LLC [Member] | Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	415	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	$ 351	$ 296

Investments (Investment Income

Investments (Investment Income (Loss), Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Investments [Abstract]
Gains (losses) on sales and exchanges of investments, net	$ 0	$ 13	$ (1)	$ 15
Investment impairment losses	(2)	(1)	(6)	(21)
Interest and dividend income	32	31	65	60
Other, net	34	15	65	34
Investment income (loss), net	$ 64	$ 58	$ 123	$ 88

Investments (Fair Value Method

Investments (Fair Value Method Investments) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
NBCUniversal Media LLC [Member]
Schedule of Fair Value Method Investments [Line Items]
Contributed investment from Comcast		$ 662
Snap [Member]
Schedule of Fair Value Method Investments [Line Items]
Payments to acquire available-for-sale securities	$ 500
Snap [Member] | NBCUniversal Media LLC [Member]
Schedule of Fair Value Method Investments [Line Items]
Contributed investment from Comcast		$ 662

Investments (Equity Method Inve

Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Equity in net income (losses) of investees	$ 15	$ (19)	$ 51	$ (30)
Atairos [Member]
Schedule of Equity Method Investments [Line Items]
Purchases of investments			994
Equity in net income (losses) of investees	42	(12)	99	(27)
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	$ (29)	$ (19)	$ (55)	(21)
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 Invest

Investments (Cost Method Investments) (Details) $ in Billions	6 Months Ended
	Jun. 30, 2017USD ($)preferred_stock_series
AirTouch [Member]
Schedule of Cost-method Investments [Line Items]
Number of series of preferred stock | preferred_stock_series	2
AirTouch [Member] | Level 2 [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of cost method investment redeemable preferred shares	$ 1.7
AirTouch [Member] | Level 2 [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of redeemable preferred shares	$ 1.7

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) ¥ in Billions, $ in Billions	6 Months Ended
	Jun. 30, 2017USD ($)	May 31, 2017JPY (¥)	May 31, 2017USD ($)
Debt Instrument [Line Items]
Total debt	$ 63.6
Fair value of debt	70.3
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Total debt	12.3
Fair value of debt	13.5
Universal Studios Japan Term Loan Maturing March 2022 [Member]
Debt Instrument [Line Items]
Debt face amount		¥ 450	$ 3.9
Universal Studios Japan Term Loan Maturing March 2022 [Member] | NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Debt face amount		¥ 450	$ 3.9
Former Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Repayments of debt	3.3
Former Universal Studios Japan Term Loans [Member] | NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Repayments of debt	$ 3.3

Long-Term Debt (Debt Borrowings

Long-Term Debt (Debt Borrowings)(Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017	Jan. 31, 2017
Floating Rate Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,500
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

Long-term Debt (Debt Repayments) (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2017	Jan. 31, 2017	Jun. 30, 2017	Jun. 30, 2016
Debt Instrument [Line Items]
Repurchases and repayments of debt			$ 4,967	$ 2,551
Senior 8.875% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt	$ 550
Interest rate	8.875%
Senior 6.50% Notes Due 2017 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 1,000
Interest rate		6.50%

Long-Term Debt (Revolving Credi

Long-Term Debt (Revolving Credit Facilities) (Details) $ in Billions	Jun. 30, 2017USD ($)
NBCUniversal Enterprise Credit Facility [Member]
Line of Credit Facility [Line Items]
Amounts available under revolving credit facilities	$ 1.5
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Amounts available under revolving credit facilities	$ 7.2

Long-Term Debt (Commercial Pape

Long-Term Debt (Commercial Paper Programs) (Details)	Jun. 30, 2017USD ($)
Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial paper outstanding	$ 1,100,000,000
NBCUniversal Enterprise Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial paper outstanding	0
Commercial Paper [Member]
Short-term Debt [Line Items]
Maximum borrowing under commercial paper programs	7,000,000,000
NBCUniversal Enterprise Commercial Paper [Member]
Short-term Debt [Line Items]
Maximum borrowing under commercial paper programs	$ 1,500,000,000

Long-Term Debt Long-term Debt (

Long-Term Debt Long-term Debt (Cross-Guarantee Structure) (Details) $ in Millions	Jun. 30, 2017USD ($)
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Ownership in cable holding company subsidiaries	100.00%
NBCUniversal Enterprise [Member]
Debt Instrument [Line Items]
Related party aggregate principal amount senior notes not subject to guarantee	$ 4,800
NBCUniversal Enterprise [Member]
Debt Instrument [Line Items]
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]
Debt Instrument [Line Items]
Guarantee obligations, maximum capacity	7,000
Comcast and Comcast Cable Debt Securities [Member]
Debt Instrument [Line Items]
Guarantee Obligations Current Principal Balance	$ 46,100

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards		$ 915
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards		$ 502
Management Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted (in shares)	39.1
Weighted average fair value of stock options granted (in dollars per share)	$ 7.01
Management Grant [Member] | Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted share units granted (in shares)	10.6
Weighted average fair value of restricted share units granted (in dollars per share)	$ 37.42

Share-Based Compensation (Recog

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 181	$ 145	$ 305	$ 260
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	40	31	65	54
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	111	89	185	159
Restricted Share Units [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	34	27	54	45
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	63	48	103	85
Stock Options [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	5	2	7	4
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	7	8	17	16
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	$ 1	$ 2	$ 4	$ 5

Supplemental Financial Inform56

Supplemental Financial Information (Receivables)(Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Supplemental Financial Information [Line Items]
Receivables, gross	$ 8,459	$ 8,622
Less: Allowance for returns and customer incentives	345	417
Less: Allowance for doubtful accounts	265	250
Receivables, net	7,849	7,955
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Receivables, gross	6,738	6,799
Less: Allowance for returns and customer incentives	341	413
Less: Allowance for doubtful accounts	78	84
Receivables, net	$ 6,319	$ 6,302

Supplemental Financial Inform57

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities	$ 17		$ 3
Deferred gains (losses) on cash flow hedges	(16)		(75)
Unrecognized gains (losses) on employee benefit obligations	276		8
Cumulative translation adjustments	151		65
Accumulated other comprehensive income (loss), net of deferred taxes	428	$ 98	1
NBCUniversal Media LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) on marketable securities	(139)		0
Deferred gains (losses) on cash flow hedges	1		(13)
Unrecognized gains (losses) on employee benefit obligations	118		3
Cumulative translation adjustments	76		105
Accumulated other comprehensive income (loss), net of deferred taxes	$ 56	$ (135)	$ 95

Supplemental Financial Inform58

Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Supplemental Financial Information [Line Items]
Net income	$ 2,535	$ 2,080	$ 5,182	$ 4,304
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,541	2,389	5,043	4,667
Share-based compensation			391	331
Noncash interest expense (income), net			122	113
Equity in net (income) losses of investees, net	(15)	19	(51)	30
Cash received from investees			49	42
Net (gain) loss on investment activity and other			(110)	(126)
Deferred income taxes			470	618
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net			18	172
Film and television costs, net			277	(171)
Accounts payable and accrued expenses related to trade creditors			(144)	(104)
Other operating assets and liabilities			(433)	(82)
Net cash provided by operating activities			10,814	9,794
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Net income	1,288	975	2,561	2,057
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	520	465	1,028	879
Equity in net (income) losses of investees, net	$ 29	$ 19	55	21
Cash received from investees			44	31
Net (gain) loss on investment activity and other			(26)	(92)
Deferred income taxes			19	64
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net			(95)	145
Film and television costs, net			275	(179)
Accounts payable and accrued expenses related to trade creditors			(220)	(185)
Other operating assets and liabilities			(115)	(263)
Net cash provided by operating activities			$ 3,526	$ 2,478

Supplemental Financial Inform59

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cash Payments for Interest and Income Taxes
Interest	$ 477	$ 512	$ 1,372	$ 1,235
Income taxes	2,077	1,495	2,209	1,685
NBCUniversal Media LLC [Member]
Cash Payments for Interest and Income Taxes
Interest	210	219	287	285
Income taxes	$ 97	$ 63	$ 149	$ 122

Supplemental Financial Inform60

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)$ / shares
Supplemental Financial Information [Line Items]
Capital expenditures incurred but not yet paid	$ 1,300
Dividends payable	$ 742
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	$ 294

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Pending Litigation [Member] | Sprint Communications Company L.P. Lawsuit [Member]
Commitment And Contingencies [Line Items]
Damages sought	$ 950
Redeemable Preferred Stock [Member] | Level 2 [Member]
Commitment And Contingencies [Line Items]
Fair Value of Redeemable subsidiary preferred stock	$ 762

Financial Data by Business Se62

Financial Data by Business Segment (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)segment	Jun. 30, 2016USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			5
Financial Data by Business Segment
Revenue	$ 21,165	$ 19,269	$ 41,628	$ 38,059
Adjusted EBITDA	7,099	6,455	14,131	12,822
Depreciation and Amortization	2,541	2,389	5,043	4,667
Operating Income (Loss)	4,558	4,066	9,088	8,155
Capital Expenditures	2,327	2,271	4,405	4,156
Cash Paid for Intangible Assets	420	359	$ 836	737
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
Financial Data by Business Segment
Revenue	8,331	7,103	$ 16,199	13,964
Adjusted EBITDA	2,071	1,689	4,088	3,311
Depreciation and Amortization	520	465	1,028	879
Operating Income (Loss)	1,551	1,224	3,060	2,432
Capital Expenditures	338	360	623	655
Cash Paid for Intangible Assets	73	62	$ 128	114
Disclosure of major customers			No single customer accounted for a significant amount of revenue in any period.
NBCUniversal Segments [Member]
Financial Data by Business Segment
Revenue	8,331	7,103	$ 16,199	13,964
Adjusted EBITDA	2,071	1,689	4,088	3,311
Depreciation and Amortization	520	465	1,028	879
Operating Income (Loss)	1,551	1,224	3,060	2,432
Capital Expenditures	338	360	623	655
Cash Paid for Intangible Assets	73	62	128	114
Operating Segments [Member] | Cable Communications [Member]
Financial Data by Business Segment
Revenue	13,122	12,444	26,034	24,648
Adjusted EBITDA	5,320	5,048	10,518	9,937
Depreciation and Amortization	2,001	1,904	3,981	3,747
Operating Income (Loss)	3,319	3,144	6,537	6,190
Capital Expenditures	1,956	1,881	3,737	3,457
Cash Paid for Intangible Assets	$ 327	$ 289	$ 679	$ 613
Cable segment revenue types as percentage of total cable revenue	100.00%	100.00%	100.00%	100.00%
Operating Segments [Member] | Cable Networks [Member]
Financial Data by Business Segment
Revenue	$ 2,696	$ 2,566	$ 5,337	$ 5,019
Adjusted EBITDA	1,055	944	2,171	1,900
Depreciation and Amortization	181	187	395	377
Operating Income (Loss)	874	757	1,776	1,523
Capital Expenditures	8	7	10	8
Cash Paid for Intangible Assets	4	3	7	4
Operating Segments [Member] | Cable Networks [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	2,696	2,566	5,337	5,019
Adjusted EBITDA	1,055	944	2,171	1,900
Depreciation and Amortization	181	187	395	377
Operating Income (Loss)	874	757	1,776	1,523
Capital Expenditures	8	7	10	8
Cash Paid for Intangible Assets	4	3	7	4
Operating Segments [Member] | Broadcast Television [Member]
Financial Data by Business Segment
Revenue	2,241	2,128	4,449	4,212
Adjusted EBITDA	416	394	738	678
Depreciation and Amortization	31	30	63	62
Operating Income (Loss)	385	364	675	616
Capital Expenditures	30	30	59	49
Cash Paid for Intangible Assets	4	3	7	6
Operating Segments [Member] | Broadcast Television [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	2,241	2,128	4,449	4,212
Adjusted EBITDA	416	394	738	678
Depreciation and Amortization	31	30	63	62
Operating Income (Loss)	385	364	675	616
Capital Expenditures	30	30	59	49
Cash Paid for Intangible Assets	4	3	7	6
Operating Segments [Member] | Filmed Entertainment [Member]
Financial Data by Business Segment
Revenue	2,155	1,351	4,136	2,734
Adjusted EBITDA	285	56	653	223
Depreciation and Amortization	26	12	47	20
Operating Income (Loss)	259	44	606	203
Capital Expenditures	19	5	29	8
Cash Paid for Intangible Assets	6	3	11	6
Operating Segments [Member] | Filmed Entertainment [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	2,155	1,351	4,136	2,734
Adjusted EBITDA	285	56	653	223
Depreciation and Amortization	26	12	47	20
Operating Income (Loss)	259	44	606	203
Capital Expenditures	19	5	29	8
Cash Paid for Intangible Assets	6	3	11	6
Operating Segments [Member] | Theme Parks [Member]
Financial Data by Business Segment
Revenue	1,314	1,136	2,432	2,162
Adjusted EBITDA	551	469	948	844
Depreciation and Amortization	186	145	328	243
Operating Income (Loss)	365	324	620	601
Capital Expenditures	243	240	472	440
Cash Paid for Intangible Assets	26	20	39	29
Operating Segments [Member] | Theme Parks [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	1,314	1,136	2,432	2,162
Adjusted EBITDA	551	469	948	844
Depreciation and Amortization	186	145	328	243
Operating Income (Loss)	365	324	620	601
Capital Expenditures	243	240	472	440
Cash Paid for Intangible Assets	26	20	39	29
Corporate, Non-Segment [Member]
Financial Data by Business Segment
Revenue	205	180	413	379
Adjusted EBITDA	(302)	(291)	(496)	(445)
Depreciation and Amortization	20	20	34	41
Operating Income (Loss)	(322)	(311)	(530)	(486)
Capital Expenditures	33	30	45	44
Cash Paid for Intangible Assets	20	8	29	10
Corporate, Non-Segment [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	9	6	17	9
Adjusted EBITDA	(235)	(175)	(420)	(335)
Depreciation and Amortization	96	91	195	177
Operating Income (Loss)	(331)	(266)	(615)	(512)
Capital Expenditures	38	78	53	150
Cash Paid for Intangible Assets	33	33	64	69
Corporate, Non-Segment [Member] | NBCUniversal Segments [Member]
Financial Data by Business Segment
Revenue	9	6	17	9
Adjusted EBITDA	(235)	(175)	(420)	(335)
Depreciation and Amortization	96	91	195	177
Operating Income (Loss)	(331)	(266)	(615)	(512)
Capital Expenditures	38	78	53	150
Cash Paid for Intangible Assets	33	33	64	69
Eliminations [Member]
Financial Data by Business Segment
Revenue	(493)	(458)	(1,018)	(932)
Adjusted EBITDA	10	9	21	19
Depreciation and Amortization	0	0	0	0
Operating Income (Loss)	10	9	21	19
Capital Expenditures	0	0	0	0
Cash Paid for Intangible Assets	0	0	0	0
Eliminations [Member] | NBCUniversal Media LLC [Member]
Financial Data by Business Segment
Revenue	(84)	(84)	(172)	(172)
Adjusted EBITDA	(1)	1	(2)	1
Depreciation and Amortization	0	0	0	0
Operating Income (Loss)	(1)	1	(2)	1
Capital Expenditures	0	0	0	0
Cash Paid for Intangible Assets	0	0	0	0
Eliminations [Member] | NBCUniversal Segments [Member]
Financial Data by Business Segment
Revenue	(84)	(84)	(172)	(172)
Adjusted EBITDA	(1)	1	(2)	1
Depreciation and Amortization	0	0	0	0
Operating Income (Loss)	(1)	1	(2)	1
Capital Expenditures	0	0	0	0
Cash Paid for Intangible Assets	$ 0	$ 0	$ 0	$ 0
Residential Video Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	44.20%	44.90%	44.40%	45.10%
Residential High-speed Internet Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	28.00%	27.10%	28.00%	27.00%
Residential Voice Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	6.50%	7.20%	6.60%	7.30%
Business Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	11.70%	10.90%	11.60%	10.80%
Advertising Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	4.40%	4.70%	4.20%	4.60%
Other Products And Services [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	5.20%	5.20%	5.20%	5.20%
Franchise And Other Regulatory Fees [Member] | Operating Segments [Member] | Cable Communications [Member]
Financial Data by Business Segment
Cable segment revenue types as percentage of total cable revenue	2.80%	2.80%	2.80%	2.80%

Financial Data by Business Se63

Financial Data by Business Segment (Reconciliation of Adjusted EBITDA from Segment to Consolidated Statements) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	$ 7,099	$ 6,455	$ 14,131	$ 12,822
Depreciation	(1,970)	(1,868)	(3,885)	(3,653)
Amortization	(571)	(521)	(1,158)	(1,014)
Other income (expense) items, net	(659)	(708)	(1,284)	(1,262)
Income before income taxes	3,899	3,358	7,804	6,893
NBCUniversal Media LLC [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Adjusted EBITDA	2,071	1,689	4,088	3,311
Depreciation	(265)	(223)	(496)	(415)
Amortization	(255)	(242)	(532)	(464)
Other income (expense) items, net	(164)	(175)	(308)	(203)
Income before income taxes	$ 1,387	$ 1,049	$ 2,752	$ 2,229

Condensed Consolidating Finan64

Condensed Consolidating Financial Information (Narrative) (Details) - Jun. 30, 2017 $ in Millions	JPY (¥)	USD ($)
NBCUniversal Enterprise Senior Debt Securities [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee		$ 4,800
NBCUniversal Enterprise Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility subject to guarantee		1,500
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 Loan Maturing March 2022 [Member]
Debt Instrument [Line Items]
Term loans subject to guarantee | ¥	¥ 450,000,000,000

Condensed Consolidating Finan65

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 2,693	$ 3,301	$ 4,665	$ 2,295
Receivables, net	7,849	7,955
Programming rights	1,633	1,250
Other current assets	2,657	3,855
Total current assets	14,832	16,361
Film and television costs	6,595	7,252
Investments	6,521	5,247
Investments in and amounts due from subsidiaries eliminated upon consolidation	0	0
Property and equipment, net	37,171	36,253
Franchise rights	59,364	59,364
Goodwill	36,742	35,980
Other intangible assets, net	18,907	17,274
Other noncurrent assets, net	2,899	2,769
Total assets	183,031	180,500
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,730	6,915
Accrued participations and residuals	1,882	1,726
Accrued expenses and other current liabilities	7,306	7,414
Current portion of long-term debt	6,358	5,480
Total current liabilities	22,276	21,535
Long-term debt, less current portion	57,210	55,566
Deferred income taxes	35,409	34,854
Other noncurrent liabilities	10,837	10,925
Redeemable noncontrolling interests	1,451	1,446
Equity:
Common stock	56	56
Other shareholders’ equity	54,949	53,887
Total Comcast Corporation shareholders’ equity	55,005	53,943
Noncontrolling interests	843	2,231
Total equity	55,848	56,174	55,276	53,978
Total liabilities and equity	183,031	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	(511,749)	(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	(1,026)	(1,017)
Total assets	(512,775)	(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	(1,055)	(1,017)
Other noncurrent liabilities	29	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	(511,749)	(481,214)
Total Comcast Corporation shareholders’ equity	(511,749)	(481,214)
Noncontrolling interests	0	0
Total equity	(511,749)	(481,214)
Total liabilities and equity	(512,775)	(482,231)
Comcast Parent [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	67	151
Total current assets	67	151
Film and television costs	0	0
Investments	96	75
Investments in and amounts due from subsidiaries eliminated upon consolidation	101,430	98,350
Property and equipment, net	434	298
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	11	13
Other noncurrent assets, net	1,149	1,138
Total assets	103,187	100,025
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	12	23
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities	1,887	1,726
Current portion of long-term debt	4,032	3,739
Total current liabilities	5,931	5,488
Long-term debt, less current portion	39,725	38,123
Deferred income taxes	0	0
Other noncurrent liabilities	2,526	2,471
Redeemable noncontrolling interests	0	0
Equity:
Common stock	56	56
Other shareholders’ equity	54,949	53,887
Total Comcast Corporation shareholders’ equity	55,005	53,943
Noncontrolling interests	0	0
Total equity	55,005	53,943
Total liabilities and equity	103,187	100,025
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	2,383	2,819	4,395	1,881
Receivables, net	7,849	7,955
Programming rights	1,633	1,250
Other current assets	2,569	3,668
Total current assets	14,434	15,692
Film and television costs	6,595	7,252
Investments	5,719	4,521
Investments in and amounts due from subsidiaries eliminated upon consolidation	110,545	97,704
Property and equipment, net	36,737	35,955
Franchise rights	59,364	59,364
Goodwill	36,742	35,980
Other intangible assets, net	18,896	17,261
Other noncurrent assets, net	2,035	1,921
Total assets	291,067	275,650
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,718	6,892
Accrued participations and residuals	1,882	1,726
Accrued expenses and other current liabilities	4,746	5,045
Current portion of long-term debt	2,322	1,187
Total current liabilities	15,668	14,850
Long-term debt, less current portion	7,039	6,994
Deferred income taxes	35,886	35,259
Other noncurrent liabilities	7,171	7,288
Redeemable noncontrolling interests	1,451	1,446
Equity:
Common stock	0	0
Other shareholders’ equity	223,009	207,582
Total Comcast Corporation shareholders’ equity	223,009	207,582
Noncontrolling interests	843	2,231
Total equity	223,852	209,813
Total liabilities and equity	291,067	275,650
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [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	1	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	126,187	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	658	638
Total assets	126,846	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	92	0
Current portion of long-term debt	0	0
Total current liabilities	92	0
Long-term debt, less current portion	142	141
Deferred income taxes	508	542
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	126,104	120,026
Total Comcast Corporation shareholders’ equity	126,104	120,026
Noncontrolling interests	0	0
Total equity	126,104	120,026
Total liabilities and equity	126,846	120,709
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [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	15	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	124,549	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	124,564	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	295	341
Current portion of long-term debt	0	550
Total current liabilities	295	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	122,169	114,705
Total Comcast Corporation shareholders’ equity	122,169	114,705
Noncontrolling interests	0	0
Total equity	122,169	114,705
Total liabilities and equity	124,564	117,696
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Assets
Cash and cash equivalents	310	482	$ 270	$ 414
Receivables, net	0	0
Programming rights	0	0
Other current assets	21	36
Total current assets	331	518
Film and television costs	0	0
Investments	690	651
Investments in and amounts due from subsidiaries eliminated upon consolidation	49,038	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	83	89
Total assets	50,142	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	286	302
Current portion of long-term debt	4	4
Total current liabilities	290	306
Long-term debt, less current portion	8,204	8,208
Deferred income taxes	70	70
Other noncurrent liabilities	1,111	1,166
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	40,467	38,901
Total Comcast Corporation shareholders’ equity	40,467	38,901
Noncontrolling interests	0	0
Total equity	40,467	38,901
Total liabilities and equity	$ 50,142	$ 48,651

Condensed Consolidating Finan66

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Service revenue	$ 21,165	$ 19,269	$ 41,628	$ 38,059
Management fee revenue	0	0	0	0
Revenue	21,165	19,269	41,628	38,059
Costs and Expenses:
Programming and production	6,341	5,492	12,415	10,923
Other operating and administrative	6,060	5,763	11,887	11,289
Advertising, marketing and promotion	1,665	1,559	3,195	3,025
Depreciation	1,970	1,868	3,885	3,653
Amortization	571	521	1,158	1,014
Total costs and expenses	16,607	15,203	32,540	29,904
Operating income	4,558	4,066	9,088	8,155
Other Income (Expense):
Interest expense	(758)	(732)	(1,513)	(1,435)
Investment income (loss), net	64	58	123	88
Equity in net income (losses) of investees, net	15	(19)	51	(30)
Other income (expense), net	20	(15)	55	115
Total other income (expense)	(659)	(708)	(1,284)	(1,262)
Income before income taxes	3,899	3,358	7,804	6,893
Income tax expense	(1,364)	(1,278)	(2,622)	(2,589)
Net income	2,535	2,080	5,182	4,304
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(22)	(52)	(103)	(142)
Net income attributable to Comcast Corporation	2,513	2,028	5,079	4,162
Comprehensive income (loss) attributable to Comcast Corporation	2,405	2,113	5,215	4,337
Elimination and Consolidation Adjustments [Member]
Revenue:
Service revenue	0	0	0	0
Management fee revenue	(558)	(527)	(1,103)	(1,040)
Revenue	(558)	(527)	(1,103)	(1,040)
Costs and Expenses:
Programming and production	0	0	0	0
Other operating and administrative	(558)	(527)	(1,103)	(1,040)
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Total costs and expenses	(558)	(527)	(1,103)	(1,040)
Operating income	0	0	0	0
Other Income (Expense):
Interest expense	0	0	0	0
Investment income (loss), net	0	0	0	0
Equity in net income (losses) of investees, net	(10,660)	(8,977)	(21,266)	(18,020)
Other income (expense), net	0	0	0	0
Total other income (expense)	(10,660)	(8,977)	(21,266)	(18,020)
Income before income taxes	(10,660)	(8,977)	(21,266)	(18,020)
Income tax expense	0	0	0	0
Net income	(10,660)	(8,977)	(21,266)	(18,020)
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income attributable to Comcast Corporation	(10,660)	(8,977)	(21,266)	(18,020)
Comprehensive income (loss) attributable to Comcast Corporation	(10,226)	(9,698)	(21,333)	(18,933)
Comcast Parent [Member] | Reportable Legal Entities [Member]
Revenue:
Service revenue	0	0	0	0
Management fee revenue	281	266	556	525
Revenue	281	266	556	525
Costs and Expenses:
Programming and production	0	0	0	0
Other operating and administrative	200	285	370	441
Advertising, marketing and promotion	0	0	0	0
Depreciation	7	6	14	14
Amortization	1	2	3	3
Total costs and expenses	208	293	387	458
Operating income	73	(27)	169	67
Other Income (Expense):
Interest expense	(531)	(478)	(1,048)	(929)
Investment income (loss), net	0	3	1	3
Equity in net income (losses) of investees, net	2,811	2,354	5,650	4,720
Other income (expense), net	0	0	0	0
Total other income (expense)	2,280	1,879	4,603	3,794
Income before income taxes	2,353	1,852	4,772	3,861
Income tax expense	160	176	307	301
Net income	2,513	2,028	5,079	4,162
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income attributable to Comcast Corporation	2,513	2,028	5,079	4,162
Comprehensive income (loss) attributable to Comcast Corporation	2,405	2,113	5,215	4,337
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Revenue:
Service revenue	21,165	19,269	41,628	38,059
Management fee revenue	0	0	0	0
Revenue	21,165	19,269	41,628	38,059
Costs and Expenses:
Programming and production	6,341	5,492	12,415	10,923
Other operating and administrative	5,880	5,522	11,506	10,856
Advertising, marketing and promotion	1,665	1,559	3,195	3,025
Depreciation	1,963	1,862	3,871	3,639
Amortization	570	519	1,155	1,011
Total costs and expenses	16,419	14,954	32,142	29,454
Operating income	4,746	4,315	9,486	8,605
Other Income (Expense):
Interest expense	(57)	(78)	(120)	(151)
Investment income (loss), net	56	60	90	92
Equity in net income (losses) of investees, net	1,291	914	2,527	1,905
Other income (expense), net	2	(8)	9	(2)
Total other income (expense)	1,292	888	2,506	1,844
Income before income taxes	6,038	5,203	11,992	10,449
Income tax expense	(1,527)	(1,468)	(2,941)	(2,921)
Net income	4,511	3,735	9,051	7,528
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(22)	(52)	(103)	(142)
Net income attributable to Comcast Corporation	4,489	3,683	8,948	7,386
Comprehensive income (loss) attributable to Comcast Corporation	4,246	4,194	8,949	7,899
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]
Revenue:
Service revenue	0	0	0	0
Management fee revenue	0	0	0	0
Revenue	0	0	0	0
Costs and Expenses:
Programming and production	0	0	0	0
Other operating and administrative	0	0	0	0
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Total costs and expenses	0	0	0	0
Operating income	0	0	0	0
Other Income (Expense):
Interest expense	(3)	(3)	(6)	(6)
Investment income (loss), net	24	1	52	1
Equity in net income (losses) of investees, net	2,613	2,275	5,263	4,539
Other income (expense), net	0	0	0	0
Total other income (expense)	2,634	2,273	5,309	4,534
Income before income taxes	2,634	2,273	5,309	4,534
Income tax expense	(7)	1	(16)	2
Net income	2,627	2,274	5,293	4,536
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income attributable to Comcast Corporation	2,627	2,274	5,293	4,536
Comprehensive income (loss) attributable to Comcast Corporation	2,591	2,321	5,307	4,627
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Revenue:
Service revenue	0	0	0	0
Management fee revenue	277	261	547	515
Revenue	277	261	547	515
Costs and Expenses:
Programming and production	0	0	0	0
Other operating and administrative	277	261	547	515
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Total costs and expenses	277	261	547	515
Operating income	0	0	0	0
Other Income (Expense):
Interest expense	(51)	(61)	(111)	(120)
Investment income (loss), net	0	0	0	0
Equity in net income (losses) of investees, net	2,301	2,127	4,621	4,241
Other income (expense), net	0	0	0	0
Total other income (expense)	2,250	2,066	4,510	4,121
Income before income taxes	2,250	2,066	4,510	4,121
Income tax expense	18	21	39	42
Net income	2,268	2,087	4,549	4,163
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income attributable to Comcast Corporation	2,268	2,087	4,549	4,163
Comprehensive income (loss) attributable to Comcast Corporation	2,269	2,087	4,551	4,165
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Revenue:
Service revenue	0	0	0	0
Management fee revenue	0	0	0	0
Revenue	0	0	0	0
Costs and Expenses:
Programming and production	0	0	0	0
Other operating and administrative	261	222	567	517
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Total costs and expenses	261	222	567	517
Operating income	(261)	(222)	(567)	(517)
Other Income (Expense):
Interest expense	(116)	(112)	(228)	(229)
Investment income (loss), net	(16)	(6)	(20)	(8)
Equity in net income (losses) of investees, net	1,659	1,288	3,256	2,585
Other income (expense), net	18	(7)	46	117
Total other income (expense)	1,545	1,163	3,054	2,465
Income before income taxes	1,284	941	2,487	1,948
Income tax expense	(8)	(8)	(11)	(13)
Net income	1,276	933	2,476	1,935
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income attributable to Comcast Corporation	1,276	933	2,476	1,935
Comprehensive income (loss) attributable to Comcast Corporation	$ 1,120	$ 1,096	$ 2,526	$ 2,242

Condensed Consolidating Finan67

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			$ 10,814	$ 9,794
Investing Activities
Net transactions with affiliates			0	0
Capital expenditures	$ (2,327)	$ (2,271)	(4,405)	(4,156)
Cash paid for intangible assets	(420)	(359)	(836)	(737)
Acquisitions and construction of real estate properties			(250)	(211)
Acquisitions, net of cash acquired			(398)	(126)
Proceeds from sales of investments			57	138
Purchases of investments			(1,825)	(580)
Other			170	(156)
Net cash provided by (used in) investing activities			(7,487)	(5,828)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net			(1,695)	205
Proceeds from borrowings			8,963	4,753
Repurchases and repayments of debt			(4,967)	(2,551)
Repurchases of common stock under repurchase program and employee plans			(2,476)	(2,636)
Dividends paid			(1,404)	(1,281)
Purchase of Universal Studios Japan noncontrolling interests			(2,299)	0
Issuances of common stock			0	19
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock			(137)	(125)
Other			80	20
Net cash provided by (used in) financing activities			(3,935)	(1,596)
Increase (decrease) in cash and cash equivalents			(608)	2,370
Cash and cash equivalents, beginning of period			3,301	2,295
Cash and cash equivalents, end of period	2,693	4,665	2,693	4,665
Elimination and Consolidation Adjustments [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by 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
Purchase of Universal Studios Japan noncontrolling interests			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
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
Comcast Parent [Member] | Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			(465)	(367)
Investing Activities
Net transactions with affiliates			2,559	880
Capital expenditures			(3)	(7)
Cash paid for intangible assets			(2)	(3)
Acquisitions and construction of real estate properties			(143)	0
Acquisitions, net of cash acquired			0	0
Proceeds from sales of investments			0	0
Purchases of investments			(20)	(15)
Other			101	(164)
Net cash provided by (used in) investing activities			2,492	691
Financing Activities
Proceeds from (repayments of) short-term borrowings, net			(627)	(400)
Proceeds from borrowings			3,500	4,753
Repurchases and repayments of debt			(1,000)	(750)
Repurchases of common stock under repurchase program and employee plans			(2,476)	(2,636)
Dividends paid			(1,404)	(1,281)
Purchase of Universal Studios Japan noncontrolling interests			0
Issuances of common stock			0	19
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock			0	0
Other			(20)	(29)
Net cash provided by (used in) financing activities			(2,027)	(324)
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			12,069	11,054
Investing Activities
Net transactions with affiliates			(3,728)	(2,543)
Capital expenditures			(4,402)	(4,149)
Cash paid for intangible assets			(834)	(734)
Acquisitions and construction of real estate properties			(107)	(211)
Acquisitions, net of cash acquired			(398)	(126)
Proceeds from sales of investments			47	36
Purchases of investments			(1,748)	(563)
Other			20	43
Net cash provided by (used in) investing activities			(11,150)	(8,247)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net			(1,068)	605
Proceeds from borrowings			5,463	0
Repurchases and repayments of debt			(3,414)	(797)
Repurchases of common stock under repurchase program and employee plans			0	0
Dividends paid			0	0
Purchase of Universal Studios Japan noncontrolling interests			(2,299)
Issuances of common stock			0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock			(137)	(125)
Other			100	24
Net cash provided by (used in) financing activities			(1,355)	(293)
Increase (decrease) in cash and cash equivalents			(436)	2,514
Cash and cash equivalents, beginning of period			2,819	1,881
Cash and cash equivalents, end of period	2,383	4,395	2,383	4,395
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			102	0
Investing Activities
Net transactions with affiliates			(102)	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			(102)	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
Purchase of Universal Studios Japan noncontrolling interests			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
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			(116)	(84)
Investing Activities
Net transactions with affiliates			666	84
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			666	84
Financing Activities
Proceeds from (repayments of) short-term borrowings, net			0	0
Proceeds from borrowings			0	0
Repurchases and repayments of debt			(550)	0
Repurchases of common stock under repurchase program and employee plans			0	0
Dividends paid			0	0
Purchase of Universal Studios Japan noncontrolling interests			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			(550)	0
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0
Cash and cash equivalents, end of period	0	0	0	0
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net cash provided by operating activities			(776)	(809)
Investing Activities
Net transactions with affiliates			605	1,579
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	102
Purchases of investments			(57)	(2)
Other			49	(35)
Net cash provided by (used in) investing activities			607	1,644
Financing Activities
Proceeds from (repayments of) short-term borrowings, net			0	0
Proceeds from borrowings			0	0
Repurchases and repayments of debt			(3)	(1,004)
Repurchases of common stock under repurchase program and employee plans			0	0
Dividends paid			0	0
Purchase of Universal Studios Japan noncontrolling interests			0
Issuances of common stock			0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock			0	0
Other			0	25
Net cash provided by (used in) financing activities			(3)	(979)
Increase (decrease) in cash and cash equivalents			(172)	(144)
Cash and cash equivalents, beginning of period			482	414
Cash and cash equivalents, end of period	$ 310	$ 270	$ 310	$ 270