Comcast (CMCSA) 10-K 3 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016
Document And Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Trading Symbol	cmcsa
Entity Registrant Name	COMCAST CORP
Entity Central Index Key	1,166,691
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Public Float		$ 155,940
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
NBCUniversal Media LLC [Member]
Document And Entity Information [Line Items]
Entity Registrant Name	NBCUniversal Media, LLC
Entity Central Index Key	902,739
Entity Filer Category	Non-accelerated Filer
Entity Public Float		$ 0
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Class A Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	2,366,357,318
Class B Common Stock [Member]
Document And Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	9,444,375

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 3,301	$ 2,295
Receivables, net	7,955	6,896
Programming rights	1,250	1,213
Deposits	1,772	21
Other current assets	2,083	1,878
Total current assets	16,361	12,303
Film and television costs	7,252	5,855
Investments	5,247	3,224
Property and equipment, net	36,253	33,665
Franchise rights	59,364	59,364
Goodwill	35,980	32,945
Other intangible assets, net	17,274	16,946
Other noncurrent assets, net	2,769	2,272
Total assets	180,500	166,574
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	6,915	6,215
Accrued participations and residuals	1,726	1,572
Deferred revenue	1,132	1,302
Accrued expenses and other current liabilities	6,282	5,462
Current portion of long-term debt	5,480	3,627
Total current liabilities	21,535	18,178
Long-term debt, less current portion	55,566	48,994
Deferred income taxes	34,854	33,566
Other noncurrent liabilities	10,925	10,637
Commitments and contingencies
Redeemable noncontrolling interests	1,446	1,221
Equity:
Preferred stock—authorized, 20,000,000 shares; issued, zero	0	0
Common stock	28	29
Additional paid-in capital	38,258	38,518
Retained earnings	23,076	21,413
Treasury stock, 436,395,514 Class A common shares	(7,517)	(7,517)
Accumulated other comprehensive income (loss)	98	(174)
Total Comcast Corporation shareholders’ equity	53,943	52,269
Noncontrolling interests	2,231	1,709
Total equity	56,174	53,978
Total liabilities and equity	180,500	166,574
NBCUniversal Media LLC [Member]
Current Assets:
Cash and cash equivalents	1,966	1,410
Receivables, net	6,302	5,411
Programming rights	1,241	1,200
Other current assets	938	841
Total current assets	10,447	8,862
Film and television costs	7,245	5,847
Investments	1,263	965
Property and equipment, net	10,511	9,521
Goodwill	23,323	20,364
Intangible assets, net	13,777	13,806
Other noncurrent assets, net	1,688	1,325
Total assets	68,254	60,690
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	1,647	1,564
Accrued participations and residuals	1,726	1,572
Program obligations	807	765
Deferred revenue	1,016	1,242
Accrued expenses and other current liabilities	1,888	1,675
Note payable to Comcast	2,703	1,750
Current portion of long-term debt	127	1,163
Total current liabilities	9,914	9,731
Long-term debt, less current portion	11,461	11,331
Accrued participations, residuals and program obligations	1,202	1,163
Other noncurrent liabilities	4,130	3,790
Commitments and contingencies
Redeemable noncontrolling interests	530	372
Equity:
Member’s capital	39,036	32,834
Accumulated other comprehensive income (loss)	(135)	(212)
Total NBCUniversal member’s equity	38,901	32,622
Noncontrolling interests	2,116	1,681
Total equity	41,017	34,303
Total liabilities and equity	68,254	60,690
Class A Common Stock [Member]
Equity:
Common stock	28	29
Class B Common Stock [Member]
Equity:
Common stock	$ 0	$ 0

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
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)	2,802,752,832	2,869,349,502
Common stock, shares outstanding (in shares)	2,366,357,318	2,432,953,988
Treasury stock (in shares)	436,395,514	436,395,514
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

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue	$ 80,403	$ 74,510	$ 68,775
Costs and Expenses:
Programming and production	24,463	22,550	20,912
Other operating and administrative	23,409	21,319	19,839
Advertising, marketing and promotion	6,114	5,963	5,101
Depreciation	7,464	6,781	6,337
Amortization	2,094	1,899	1,682
Total costs and expenses	63,544	58,512	53,871
Operating income	16,859	15,998	14,904
Other Income (Expense):
Interest expense	(2,942)	(2,702)	(2,617)
Investment income (loss), net	213	81	296
Equity in net income (losses) of investees, net	(104)	(325)	97
Other income (expense), net	327	320	(215)
Nonoperating income (expense)	(2,506)	(2,626)	(2,439)
Income before income taxes	14,353	13,372	12,465
Income tax expense	(5,308)	(4,959)	(3,873)
Net income	9,045	8,413	8,592
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(350)	(250)	(212)
Net income attributable to Parent	$ 8,695	$ 8,163	$ 8,380
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 3.61	$ 3.28	$ 3.24
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	3.57	3.24	3.20
Dividends declared per common share (in dollars per share)	1.10	1	0.90
Unaudited pro forma diluted earnings per common share attributable to Comcast Corporation shareholders, adjusted for the two for one stock split	$ 1.78	$ 1.62	$ 1.60
NBCUniversal Media LLC [Member]
Revenue	$ 31,593	$ 28,462	$ 25,428
Costs and Expenses:
Programming and production	14,540	13,418	12,318
Other operating and administrative	7,059	5,891	5,364
Advertising, marketing and promotion	2,767	2,795	2,158
Depreciation	861	669	654
Amortization	944	870	841
Total costs and expenses	26,171	23,643	21,335
Operating income	5,422	4,819	4,093
Other Income (Expense):
Interest expense	(595)	(495)	(508)
Investment income (loss), net	30	5	27
Equity in net income (losses) of investees, net	(99)	(376)	46
Other income (expense), net	93	(102)	(218)
Nonoperating income (expense)	(571)	(968)	(653)
Income before income taxes	4,851	3,851	3,440
Income tax expense	(305)	(227)	(143)
Net income	4,546	3,624	3,297
Net (income) loss attributable to noncontrolling interests	(311)	(210)	(182)
Net income attributable to Parent	$ 4,235	$ 3,414	$ 3,115

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 9,045	$ 8,413	$ 8,592
Unrealized gains (losses) on marketable securities, net of deferred taxes	0	1	33
Deferred gains (losses) on cash flow hedges, net of deferred taxes	(60)	(106)	(5)
Amounts reclassified to net income:
Realized (gains) losses on marketable securities, net of deferred taxes	(1)	(1)	(99)
Realized (gains) losses on cash flow hedges, net of deferred taxes	92	64	46
Employee benefit obligations, net of deferred taxes	213	74	(139)
Currency translation adjustments, net of deferred taxes	102	(89)	(38)
Comprehensive income	9,391	8,356	8,390
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	(350)	(250)	(212)
Other comprehensive (income) loss attributable to noncontrolling interests	(74)	29	0
Comprehensive income attributable to Parent	8,967	8,135	8,178
NBCUniversal Media LLC [Member]
Net income	4,546	3,624	3,297
Deferred gains (losses) on cash flow hedges, net of deferred taxes	24	(21)	25
Amounts reclassified to net income:
Employee benefit obligations, net of deferred taxes	15	60	(106)
Currency translation adjustments, net of deferred taxes	112	(121)	(62)
Comprehensive income	4,697	3,542	3,154
Net (income) loss attributable to noncontrolling interests	(311)	(210)	(182)
Other comprehensive (income) loss attributable to noncontrolling interests	(74)	29	0
Comprehensive income attributable to Parent	$ 4,312	$ 3,361	$ 2,972

Consolidated Statement of Comp6

Consolidated Statement of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrealized gains (losses) on marketable securities, deferred taxes	$ (1)	$ (1)	$ (19)
Deferred gains (losses) on cash flow hedges, deferred taxes	35	62	3
Realized (gains) losses on marketable securities, deferred taxes	1	1	59
Realized (gains) losses on cash flow hedges, deferred taxes	(54)	(38)	(27)
Employee benefit obligations, deferred taxes	(125)	(43)	82
Currency translation adjustments, deferred taxes	$ (14)	$ 34	$ 23

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 9,045	$ 8,413	$ 8,592
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,558	8,680	8,019
Share-based compensation	640	567	513
Noncash interest expense (income), net	230	205	180
Equity in net (income) losses of investees, net	104	325	(97)
Cash received from investees	85	168	104
Net (gain) loss on investment activity and other	(169)	(318)	4
Deferred income taxes	1,444	958	1,165
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	(782)	(708)	(33)
Film and television costs, net	(495)	(299)	(562)
Accounts payable and accrued expenses related to trade creditors	374	384	153
Other operating assets and liabilities	(794)	403	(1,093)
Net cash provided by operating activities	19,240	18,778	16,945
Investing Activities
Capital expenditures	(9,135)	(8,499)	(7,420)
Cash paid for intangible assets	(1,686)	(1,370)	(1,122)
Acquisitions and construction of real estate properties	(428)	(178)	(43)
Acquisitions, net of cash acquired	(3,929)	(1,786)	(477)
Proceeds from sales of businesses and investments	218	433	666
Purchases of investments	(1,697)	(784)	(191)
Deposits	(1,749)	(18)	0
Other	21	238	(146)
Net cash provided by (used in) investing activities	(18,385)	(11,964)	(8,733)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	1,790	135	(504)
Proceeds from borrowings	9,231	5,486	4,182
Repurchases and repayments of debt	(3,052)	(4,378)	(3,175)
Repurchases and retirements of common stock	(5,000)	(6,750)	(4,251)
Dividends paid	(2,601)	(2,437)	(2,254)
Issuances of common stock	23	36	35
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(253)	(232)	(220)
Other	13	(289)	167
Net cash provided by (used in) financing activities	151	(8,429)	(6,020)
Increase (decrease) in cash and cash equivalents	1,006	(1,615)	2,192
Cash and cash equivalents, beginning of year	2,295	3,910	1,718
Cash and cash equivalents, end of year	3,301	2,295	3,910
NBCUniversal Media LLC [Member]
Operating Activities
Net income	4,546	3,624	3,297
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,805	1,539	1,495
Equity in net (income) losses of investees, net	99	376	(46)
Cash received from investees	68	60	74
Net (gain) loss on investment activity and other	(80)	56	136
Deferred income taxes	89	(11)	(12)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	(635)	(718)	(25)
Film and television costs, net	(502)	(304)	(571)
Accounts payable and accrued expenses related to trade creditors	51	97	(88)
Other operating assets and liabilities	(544)	585	264
Net cash provided by operating activities	4,897	5,304	4,524
Investing Activities
Capital expenditures	(1,452)	(1,386)	(1,221)
Cash paid for intangible assets	(283)	(211)	(130)
Acquisitions, net of cash acquired	(205)	(1,522)	(118)
Proceeds from sales of businesses and investments	109	218	13
Purchases of investments	(290)	(649)	(35)
Other	(123)	150	(122)
Net cash provided by (used in) investing activities	(2,244)	(3,400)	(1,613)
Financing Activities
Repurchases and repayments of debt	(1,565)	(1,022)	(906)
Proceeds from (repayments of) borrowings from Comcast, net	928	854	97
Distributions to member	(1,606)	(1,385)	(1,641)
Distributions to noncontrolling interests	(210)	(189)	(177)
Other	356	0	(3)
Net cash provided by (used in) financing activities	(2,097)	(1,742)	(2,630)
Increase (decrease) in cash and cash equivalents	556	162	281
Cash and cash equivalents, beginning of year	1,410	1,248	967
Cash and cash equivalents, end of year	$ 1,966	$ 1,410	$ 1,248

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - 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 A Special Common Stock [Member]Common Stock [Member]	Class B Common Stock [Member]Common Stock [Member]
Beginning Balance at Dec. 31, 2013								$ 29,327		$ 29,056	$ (16)	$ 287
Beginning Balance at Dec. 31, 2013	$ 51,058		$ 38,890	$ 19,235	$ (7,517)	$ 56	$ 364						$ 25	$ 5	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	299		732	(433)
Repurchases and retirements of common stock	(4,251)		(928)	(3,323)
Employee stock purchase plans	118		118
Dividends declared	(2,320)			(2,320)				(1,641)		(1,641)
Issuance of subsidiary shares to noncontrolling interests	11						11	0
Contributions From And Distributions To Noncontrolling Interests	(132)						(132)	(152)				(152)
Other comprehensive income (loss)	(202)					(202)		(143)			(143)
Other	(29)		(7)				(22)	(13)		(1)		(12)
Net income (loss)	8,516			8,380			136	3,259		3,115		144
Ending Balance at Dec. 31, 2014	53,068		38,805	21,539	(7,517)	(146)	357						25	5	0
Ending Balance at Dec. 31, 2014								30,637		30,529	(159)	267
Beginning Balance at Dec. 31, 2013		$ 957							$ 231
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of subsidiary shares to noncontrolling interests, temporary equity		85							85
Contributions from (distributions to) noncontrolling interests, net		(19)							(24)
Other		(33)
Net income (loss)		76							38
Ending Balance at Dec. 31, 2014		1,066							330
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	337		739	(402)
Repurchases and retirements of common stock	(6,750)		(1,345)	(5,404)										(1)
Employee stock purchase plans	136		136
Dividends declared	(2,483)			(2,483)				(1,385)		(1,385)
Contributions From And Distributions To Noncontrolling Interests	(146)						(146)	(159)				(159)
Other comprehensive income (loss)	(57)					(28)	(29)	(82)			(53)	(29)
Contribution from member								252		252
Reclassification of Class A Special common stock	0												4	(4)
Universal Studios Japan	1,440						1,440	1,429		(11)		1,440
Other	106		183				(77)	31		35		(4)
Net income (loss)	8,327			8,163			164	3,580		3,414		166
Ending Balance at Dec. 31, 2015	53,978		38,518	21,413	(7,517)	(174)	1,709						29	0	0
Ending Balance at Dec. 31, 2015								34,303		32,834	(212)	1,681
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions from (distributions to) noncontrolling interests, net		11							(30)
Other		58							28
Net income (loss)		86							44
Ending Balance at Dec. 31, 2015	1,221	1,221						372	372
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock compensation plans	394		720	(326)
Repurchases and retirements of common stock	(5,000)		(949)	(4,050)									(1)
Employee stock purchase plans	156		156
Dividends declared	(2,656)			(2,656)				(1,606)		(1,606)
Contributions From And Distributions To Noncontrolling Interests	(134)						(134)	(148)				(148)
Other comprehensive income (loss)	346					272	74	151			77	74
Contribution from member								3,655		3,566		89
Other	138		(187)				325	165		7		158
Net income (loss)	8,952			8,695			257	4,497		4,235		262
Ending Balance at Dec. 31, 2016	56,174		$ 38,258	$ 23,076	$ (7,517)	$ 98	$ 2,231						$ 28	$ 0	$ 0
Ending Balance at Dec. 31, 2016								41,017		$ 39,036	$ (135)	$ 2,116
Increase (Decrease) in Temporary Equity [Roll Forward]
Contributions from (distributions to) noncontrolling interests, net		(16)							(59)
Other		148							168
Net income (loss)		93							49
Ending Balance at Dec. 31, 2016	$ 1,446	$ 1,446						$ 530	$ 530

Business and Basis of Presentat

Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2016
Business And Basis Of Presentation [Line Items]
Business and Basis of Presentation	Note 1: Business and Basis of Presentation We are a global media and technology company with two primary businesses, Comcast Cable and NBCUniversal. We were incorporated under the laws of Pennsylvania in December 2001. Through our predecessors, we have developed, managed and operated cable systems since 1963. We present our operations for Comcast Cable in one reportable business segment, referred to as Cable Communications, and our operations for NBCUniversal in four reportable business segments: Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks (collectively, the “NBCUniversal segments”). See Note 17 for additional information on our reportable business segments. Our Cable Communications segment primarily manages and operates cable systems that serve residential and business customers in the United States. As of December 31, 2016 , our cable systems had 28.6 million total customer relationships and served 22.5 million video customers, 24.7 million high-speed Internet customers and 11.7 million voice customers. Our Cable Networks segment consists primarily of a diversified portfolio of cable television networks. Our cable networks are comprised of our national cable networks that provide a variety of entertainment, news and information, and sports content, our regional sports and news networks, our international cable networks, and our cable television studio production operations. Our Broadcast Television segment consists primarily of the NBC and Telemundo broadcast networks, our owned NBC and Telemundo local broadcast television stations, the NBC Universo national cable network, and our broadcast television studio production operations. Our Filmed Entertainment segment primarily produces, acquires, markets and distributes filmed entertainment worldwide. Our films are produced primarily under the Universal Pictures, Illumination and Focus Features names and in August 2016, we acquired DreamWorks Animation. See Note 5 for additional information on the acquisition. Our Theme Parks segment consists primarily of our Universal theme parks in Orlando, Florida and Hollywood, California and our 51% interest in the Universal Studios theme park in Osaka, Japan (“Universal Studios Japan”), which we acquired in November 2015. See Note 5 for additional information on the acquisition. Our other business interests, which are included in Corporate and Other, consist primarily of Comcast Spectacor, which owns the Philadelphia Flyers and the Wells Fargo Center arena in Philadelphia, Pennsylvania and operates arena management-related businesses. Basis of Presentation The accompanying consolidated financial statements include all entities in which we have a controlling voting interest and variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”). We translate assets and liabilities of our foreign operations where the functional currency is the local currency, primarily the Japanese yen, euro and British pound, into U.S. dollars at the exchange rate as of the balance sheet date and translate revenue and expenses using average monthly exchange rates. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss) in our consolidated balance sheet. Any foreign currency transaction gains or losses are included in our consolidated statement of income. Reclassifications Reclassifications have been made to our consolidated financial statements for the prior years to conform to classifications used in 2016 . 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 (the “Stock Split”) payable on February 17, 2017 to shareholders of record as of February 8, 2017. The Stock Split will be in the form of one additional share for every share held and will be payable in shares of Class A common stock on the outstanding Class A common stock and Class B common stock. The pro forma diluted earnings per common share attributable to Comcast Corporation shareholders in our consolidated statement of income has been adjusted to reflect the Stock Split for all periods presented. All other share-based data, including the number of shares outstanding and related prices, per share amounts, and share authorizations and conversions have not been adjusted to reflect the Stock Split for any of the periods presented.
NBCUniversal Media LLC [Member]
Business And Basis Of Presentation [Line Items]
Business and Basis of Presentation	Note 1: Business and Basis of Presentation Unless indicated otherwise, throughout these notes to the consolidated financial statements, we refer to NBCUniversal and its consolidated subsidiaries as “we,” “us” and “our.” We are one of the world’s leading media and entertainment companies that develops, produces and distributes entertainment, news and information, sports, and other content for global audiences, and owns and operates theme parks worldwide. We present our operations as the following four reportable business segments: Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks. See Note 16 for additional information on our reportable business segments. Our Cable Networks segment consists primarily of a diversified portfolio of cable television networks. Our cable networks are comprised of our national cable networks that provide a variety of entertainment, news and information, and sports content, our regional sports and news networks, our international cable networks, and our cable television studio production operations. Our Broadcast Television segment consists primarily of the NBC and Telemundo broadcast networks, our owned NBC and Telemundo local broadcast television stations, the NBC Universo national cable network, and our broadcast television studio production operations. Our Filmed Entertainment segment primarily produces, acquires, markets and distributes filmed entertainment worldwide. Our films are produced primarily under the Universal Pictures, Illumination and Focus Features names and in August 2016, Comcast acquired DreamWorks Animation. See Note 4 for additional information on the acquisition. Our Theme Parks segment consists primarily of our Universal theme parks in Orlando, Florida and Hollywood, California and our 51% interest in the Universal Studios theme park in Osaka, Japan (“Universal Studios Japan”), which we acquired in November 2015. See Note 4 for additional information on the acquisition. Basis of Presentation The accompanying consolidated financial statements include all entities in which we have a controlling voting interest and variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”). Transactions between NBCUniversal and both Comcast and Comcast’s consolidated subsidiaries are reflected in these consolidated financial statements and disclosed as related party transactions when material. We translate assets and liabilities of our foreign operations where the functional currency is the local currency, primarily the Japanese yen, euro and British pound, into U.S. dollars at the exchange rate as of the balance sheet date and translate revenue and expenses using average monthly exchange rates. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss) in our consolidated balance sheet. Any foreign currency transaction gains or losses are included in our consolidated statement of income.

Accounting Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Line Items]
Accounting Policies	Note 2: Accounting Policies Our consolidated financial statements are prepared in accordance with GAAP, which require us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the reported amount of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and contingent liabilities. Actual results could differ from these estimates. We believe that the judgments and related estimates for the following items are critical in the preparation of our consolidated financial statements: • valuation and impairment testing of cable franchise rights (see Note 9) • film and television costs (see Note 6) In addition, the following accounting policies are specific to the industries in which we operate: • capitalization and amortization of film and television costs (see Note 6) • installation revenue and costs for connecting customers to our cable systems (see revenue recognition below and Note 8) Information on our other accounting policies and methods that are used in the preparation of our consolidated financial statements are included, where applicable, in their respective footnotes that follow. Below is a discussion of accounting policies and methods used in our consolidated financial statements that are not presented within other footnotes. Revenue Recognition Cable Communications Segment Our Cable Communications segment generates revenue primarily from subscriptions to our video, high-speed Internet and voice services (“cable services”) and from the sale of advertising. We recognize revenue from cable services as each service is provided. Customers are typically billed in advance on a monthly basis based on the services and features they receive and the type of equipment they use. Since installation revenue obtained from the connection of customers to our cable systems is less than the related direct selling costs, we recognize revenue as connections are completed. We manage credit risk by screening applicants through the use of internal customer information, identification verification tools and credit bureau data. If a customer’s account is delinquent, various measures are used to collect outstanding amounts, including termination of the customer’s cable services. As part of our distribution agreements with cable networks, we generally receive an allocation of scheduled advertising time on cable networks that we sell through our advertising business, Spotlight, to local, regional and national advertisers. We recognize advertising revenue when the advertising is aired or viewed. In most cases, the available advertising units are sold by our sales force. In some cases, we work with representation firms as an extension of our sales force to sell a portion of the advertising units allocated to us. We also represent the advertising sales efforts of other multichannel video providers in some markets. Since we are acting as the principal in these arrangements, we record the advertising that is sold in revenue and the fees paid to representation firms and multichannel video providers in other operating and administrative expenses. Revenue earned from other sources, such as our home security and automation services, is recognized when services are provided or events occur. Under the terms of our cable franchise agreements, we are generally required to pay to the cable franchising authority an amount based on our gross video revenue. We pass these fees through to our cable services customers and classify the fees as a component of revenue with the corresponding costs included in other operating and administrative expenses. Cable Networks and Broadcast Television Segments Our Cable Networks segment generates revenue primarily from the distribution of our cable network programming to multichannel video providers, from the sale of advertising on our cable networks and related digital media properties, from the licensing of our owned programming to cable and broadcast networks and subscription video on demand services, from the sale of our owned programming on standard-definition digital video discs and Blu-ray discs (together, “DVDs”) and through digital distribution services such as iTunes, and from the sale of programming by our cable television studio production operations to third-party networks and subscription video on demand services. Our Broadcast Television segment generates revenue primarily from the sale of advertising on our broadcast networks, owned local broadcast television stations and related digital media properties, from the licensing of our owned programming by our broadcast television studio production operations to various distribution platforms, including to cable and broadcast networks as well as to subscription video on demand services, from the fees received under retransmission consent agreements and associated fees received from NBC-affiliated local broadcast television stations, and from the sale of our owned programming on DVDs and through digital distribution services. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee audience ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until the shortfall is settled, primarily by providing additional advertising units. We recognize revenue from the licensing of our owned programming and programming produced by our studios for third parties when the content is made available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the component of revenue associated with the advertisements when they are aired or viewed. Filmed Entertainment Segment Our Filmed Entertainment segment generates revenue primarily from the worldwide distribution of our produced and acquired films for exhibition in movie theaters, from the licensing of our owned and acquired films through various distribution platforms, and from the sale of our owned and acquired films on DVDs and through digital distribution services. Our Filmed Entertainment segment also generates revenue from producing and licensing live stage plays, from the distribution of filmed entertainment produced by third parties, and from Fandango, our movie ticketing and entertainment business. We recognize revenue from the distribution of films to movie theaters when the films are exhibited. We recognize revenue from the licensing of a film when the film is available for use by the licensee, and when certain other conditions are met. We recognize revenue from the sale of DVDs, net of estimated returns and customer incentives, on the date that the DVDs are delivered to and made available for sale by retailers. Theme Parks Segment Our Theme Parks segment generates revenue primarily from ticket sales and guest spending at our Universal theme parks. We recognize revenue from advance theme park ticket sales when the tickets are used. For annual passes, we recognize revenue on a straight-line basis over the period following the activation date. Cable Communications Programming Expenses Cable Communications programming expenses are the fees we pay to license the programming we distribute to our video customers. Programming is generally acquired under multiyear distribution agreements, with rates typically based on the number of customers that receive the programming, channel positioning and the extent of distribution. From time to time, these contracts expire and programming continues to be provided under interim arrangements while the parties negotiate new contract terms, sometimes with effective dates that affect prior periods. While payments are typically made under the prior contract’s terms, the amount of programming expenses recorded during the interim arrangement is based on our estimate of the ultimate contract terms expected to be negotiated. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. When our Cable Communications segment receives incentives from a cable network for the licensing of its programming, we defer a portion of these incentives, which are included in other current and noncurrent liabilities, and recognize them over the term of the contract as a reduction to programming expenses. Advertising Expenses Advertising costs are expensed as incurred. Cash Equivalents The carrying amounts of our cash equivalents approximate their fair values. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of three months or less when purchased. Derivative Financial Instruments We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in interest rates, foreign exchange rates and equity prices. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Our derivative financial instruments are recorded in our consolidated balance sheet at fair value. The impact of our derivative financial instruments on our consolidated financial statements was not material in any of the periods presented. Fair Value Measurements The accounting guidance related to financial assets and financial liabilities (“financial instruments”) establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below. • Level 1: Values are determined using quoted market prices for identical financial instruments in an active market • Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable • Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation We use these levels of hierarchy for the measurement of fair value related to acquisitions, investments, long-term debt, redeemable subsidiary preferred stock and impairment testing, among others. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation and classification within the fair value hierarchy. Our financial instruments that are accounted for at fair value on a recurring basis were not material as of December 31, 2016 and 2015. Asset Retirement Obligations Certain of our cable franchise agreements and lease agreements contain provisions requiring us to restore facilities or remove property in the event that the franchise or lease agreement is not renewed. We expect to continually renew our cable franchise agreements and therefore cannot reasonably estimate any liabilities associated with such agreements. A remote possibility exists that franchise agreements could be terminated unexpectedly, which could result in us incurring significant expense in complying with restoration or removal provisions. We do not have any significant liabilities related to asset retirements recorded in our consolidated financial statements.
NBCUniversal Media LLC [Member]
Accounting Policies [Line Items]
Accounting Policies	Note 2: Accounting Policies Our consolidated financial statements are prepared in accordance with GAAP, which require us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the reported amount of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and contingent liabilities. Actual results could differ from these estimates. We believe that the judgments and related estimates for the following items are critical in the preparation of our consolidated financial statements: • revenue recognition (see below) • film and television costs (see Note 6) • goodwill and intangible assets (see Note 9) In addition, the following accounting policy is specific to the industries in which we operate: • capitalization and amortization of film and television costs (see Note 6) Information on our other accounting policies and methods that are used in the preparation of our consolidated financial statements are included, where applicable, in their respective footnotes that follow. Below is a discussion of accounting policies and methods used in our consolidated financial statements that are not presented within other footnotes. Revenue Recognition Cable Networks and Broadcast Television Segments Our Cable Networks segment generates revenue primarily from the distribution of our cable network programming to multichannel video providers, from the sale of advertising on our cable networks and related digital media properties, from the licensing of our owned programming to cable and broadcast networks and subscription video on demand services, from the sale of our owned programming on standard-definition digital video discs and Blu-ray discs (together, “DVDs”) and through digital distribution services such as iTunes, and from the sale of programming by our cable television studio production operations to third-party networks and subscription video on demand services. Our Broadcast Television segment generates revenue primarily from the sale of advertising on our broadcast networks, owned local broadcast television stations and related digital media properties, from the licensing of our owned programming by our broadcast television studio production operations to various distribution platforms, including to cable and broadcast networks as well as to subscription video on demand services, from the fees received under retransmission consent agreements and associated fees received from NBC-affiliated local broadcast television stations, and from the sale of our owned programming on DVDs and through digital distribution services. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee audience ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until the shortfall is settled, primarily by providing additional advertising units. We recognize revenue from the licensing of our owned programming and programming produced by our studios for third parties when the content is made available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the component of revenue associated with the advertisements when they are aired or viewed. Filmed Entertainment Segment Our Filmed Entertainment segment generates revenue primarily from the worldwide distribution of our produced and acquired films for exhibition in movie theaters, from the licensing of our owned and acquired films through various distribution platforms, and from the sale of our owned and acquired films on DVDs and through digital distribution services. Our Filmed Entertainment segment also generates revenue from producing and licensing live stage plays, from the distribution of filmed entertainment produced by third parties, and from Fandango, our movie ticketing and entertainment business. We recognize revenue from the distribution of films to movie theaters when the films are exhibited. We recognize revenue from the licensing of a film when the film is available for use by the licensee, and when certain other conditions are met. We recognize revenue from the sale of DVDs, net of estimated returns and customer incentives, on the date that the DVDs are delivered to and made available for sale by retailers. Theme Parks Segment Our Theme Parks segment generates revenue primarily from ticket sales and guest spending at our Universal theme parks. We recognize revenue from advance theme park ticket sales when the tickets are used. For annual passes, we recognize revenue on a straight-line basis over the period following the activation date. Advertising Expenses Advertising costs are expensed as incurred. Cash Equivalents The carrying amounts of our cash equivalents approximate their fair values. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of three months or less when purchased. Derivative Financial Instruments We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in foreign exchange rates and interest rates. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Our derivative financial instruments are recorded in our consolidated balance sheet at fair value. The impact of our derivative financial instruments on our consolidated financial statements was not material for all periods presented. Fair Value Measurements The accounting guidance related to financial assets and financial liabilities (“financial instruments”) establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below. • Level 1: Values are determined using quoted market prices for identical financial instruments in an active market • Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable • Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation We use these levels of hierarchy for the measurement of fair value related to acquisitions, investments, long-term debt and impairment testing, among others. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation and classification within the fair value hierarchy. Our financial instruments that are accounted for at fair value on a recurring basis were not material as of December 31, 2016 and 2015.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2016
Recent Accounting Pronouncements [Line Items]
Recent Accounting Pronouncements	Note 3: Recent Accounting Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our consolidated financial statements. However, we do expect that the new standard will impact the timing of recognition for (1) our Cable Communications segment’s installation revenue and commission expenses, which upon adoption will be recognized as revenue and costs over a period of time instead of immediately, and (2) our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Consolidations In February 2015, the FASB updated the accounting guidance related to consolidation under the variable interest entity and voting interest entity models. The updated accounting guidance modifies the consolidation guidance for VIEs, limited partnerships and similar legal entities. We have adopted this guidance as of January 1, 2016 and it did not have a material impact on our consolidated financial statements. 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, with certain exceptions, a cumulative effect adjustment to beginning retained earnings when the guidance is adopted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. See Note 16 for a summary of our undiscounted minimum rental commitments under operating leases as of December 31, 2016. 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 are under the current guidance. In addition, the updated guidance requires when an employer withholds shares upon exercise of options or the vesting of restricted stock for the purpose of meeting withholding tax requirements, that the cash paid for withholding taxes be classified as a financing activity. We currently record these amounts within operating activities. We will adopt the updated guidance in the first quarter of 2017. As required under the updated guidance, we will prospectively adopt the provisions of this guidance that relate to the recognition of the excess income tax benefits or deficiencies in the statement of income. If we had adopted the updated guidance in 2016, our income tax expense and effective tax rate would have decreased by $233 million and 1.6% , respectively, and our diluted earnings per common share attributable to Comcast Corporation shareholders in 2016 would have increased by $0.08 . In addition, upon adoption we will retrospectively adopt the provisions of this guidance related to changes to the statement of cash flows in any of the periods presented. The table below presents the effect on our consolidated statement of cash flows for each of the years ended December 31, 2016, 2015 and 2014. These amounts are not necessarily indicative of amounts that we will recognize in future years related to the excess income tax benefits or deficiencies nor the cash paid for withholding taxes. Year ended December 31 (in millions) As Reported Effect of Adoption Upon Adoption 2016 Net cash provided by operating activities $ 19,240 $ 585 $ 19,825 Net cash provided by (used in) financing activities $ 151 $ (585 ) $ (434 ) 2015 Net cash provided by operating activities $ 18,778 $ 708 $ 19,486 Net cash provided by (used in) financing activities $ (8,429 ) $ (708 ) $ (9,137 ) 2014 Net cash provided by operating activities $ 16,945 $ 652 $ 17,597 Net cash provided by (used in) financing activities $ (6,020 ) $ (652 ) $ (6,672 )
NBCUniversal Media LLC [Member]
Recent Accounting Pronouncements [Line Items]
Recent Accounting Pronouncements	Note 3: Recent Accounting Pronouncements Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our consolidated financial statements. However, we do expect that the new standard will impact the timing of recognition for our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Consolidations In February 2015, the FASB updated the accounting guidance related to consolidation under the variable interest entity and voting interest entity models. The updated accounting guidance modifies the consolidation guidance for VIEs, limited partnerships and similar legal entities. We have adopted this guidance as of January 1, 2016 and it did not have a material impact on our consolidated financial statements. 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, with certain exceptions, a cumulative effect adjustment to beginning retained earnings when the guidance is adopted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. See Note 15 for a summary of our undiscounted minimum rental commitments under operating leases as of December 31, 2016. Share-Based Compensation In March 2016, the FASB updated the accounting guidance that affects several aspects of the accounting for share-based compensation. 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 are under the current guidance. In addition, the updated guidance requires when an employer withholds shares upon exercise of options or the vesting of restricted stock for the purpose of meeting withholding tax requirements, that the cash paid for withholding taxes be classified as a financing activity. We will adopt the updated guidance in the first quarter of 2017. As a limited liability company, the updated guidance related to the excess income tax benefits or deficiencies to be recognized in the statement of income will not have a material impact on our consolidated financial statements. In addition, as the share-based compensation expense is settled in cash with Comcast, we do not expect the updated accounting guidance to have a material impact on our statement of cash flows.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Note 4: Earnings Per Share Computation of Diluted EPS 2016 2015 2014 Year ended December 31 Net Income Shares Per Share Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 8,695 2,410 $ 3.61 $ 8,163 2,486 $ 3.28 $ 8,380 2,583 $ 3.24 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 28 32 37 Diluted EPS attributable to Comcast Corporation shareholders $ 8,695 2,438 $ 3.57 $ 8,163 2,518 $ 3.24 $ 8,380 2,620 $ 3.20 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”). Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the combination of the option exercise price and the associated unrecognized compensation expense is greater than the average market price of our common stock. 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 in any of the periods presented.

Significant Transactions

Significant Transactions	12 Months Ended
	Dec. 31, 2016
Business Acquisition [Line Items]
Significant Transactions	Note 5: Significant Transactions 2016 DreamWorks Animation On August 22, 2016, we acquired all of the outstanding stock of DreamWorks Animation for $ 3.8 billion . DreamWorks Animation’s stockholders received $ 41 in cash for each share of DreamWorks Animation common stock. DreamWorks Animation creates animated feature films, television series and specials, live entertainment and related consumer products. The results of operations for DreamWorks Animation are reported in our Filmed Entertainment segment following the acquisition date. Preliminary Allocation of Purchase Price The transaction was accounted for under the acquisition method of accounting and, accordingly, the assets and liabilities are to be recorded at their fair market values as of the acquisition date. We recorded the acquired assets and liabilities of DreamWorks Animation at their estimated fair values based on preliminary valuation analyses. In valuing acquired assets and liabilities, fair value estimates are primarily based on Level 3 inputs including future expected cash flows, market rate assumptions and discount rates. The fair value of the assumed debt was primarily based on quoted market values. The fair value of the liability related to a tax receivable agreement that DreamWorks Animation had previously entered into with one of its former stockholders (the “tax receivable agreement”) was based on the contractual settlement provisions in the agreement. Further, we recorded the deferred income taxes based on our estimates of the tax basis of the acquired net assets and the valuation allowances based on the expected use of net operating loss carryforwards. The goodwill is not deductible for tax purposes. We will adjust the assets and liabilities as valuations are completed and we obtain information necessary to complete the analyses, but no later than one year from the acquisition date. The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation. Preliminary Allocation of Purchase Price (in millions) Film and television costs (see Note 6) $ 854 Intangible assets (see Note 9) 164 Working capital 248 Debt (see Note 10) (381 ) Tax receivable agreement (146 ) Deferred income taxes (see Note 14) 366 Other noncurrent assets and liabilities 137 Identifiable net assets (liabilities) acquired 1,242 Noncontrolling interest (89 ) Goodwill (see Note 9) 2,620 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 consolidated statement of cash flows. In addition, we repaid all of the assumed debt of DreamWorks Animation. Revenue and net income attributable to the acquisition of DreamWorks Animation were not material for 2016. 2015 Universal Studios Japan On November 13, 2015, NBCUniversal acquired a 51% economic interest in Universal Studios Japan for $1.5 billion . Universal Studios Japan is a VIE based on the governance structure and we consolidate Universal Studios Japan since we have the power to direct activities that most significantly impact its economic performance. There are no liquidity arrangements, guarantees or other financial commitments between us and Universal Studios Japan, and therefore our maximum risk of financial loss is NBCUniversal’s 51% interest. Universal Studios Japan’s results of operations are reported in our Theme Parks segment following the acquisition date. Allocation of Purchase Price The transaction was accounted for under the acquisition method of accounting and, accordingly, the acquired assets and liabilities and the 49% noncontrolling interest were recorded at their estimated fair values. In 2016, we updated the allocation of the purchase price for Universal Studios Japan based on final valuation analyses, which primarily resulted in increases to property and equipment and intangible assets and a decrease in goodwill. The changes did not have a material impact on our consolidated financial statements. The goodwill is not deductible for tax purposes. The table below presents the allocation of the purchase price to the assets and liabilities of Universal Studios Japan. Allocation of Purchase Price (in millions) Property and equipment (see Note 8) $ 780 Intangible assets (see Note 9) 323 Working capital (33 ) Debt (see Note 10) (3,271 ) Other noncurrent assets and liabilities 17 Identifiable net assets (liabilities) acquired (2,184 ) Noncontrolling interest (1,440 ) Goodwill (see Note 9) 5,123 Cash consideration transferred $ 1,499 Actual and Unaudited Pro Forma Results Our consolidated revenue in 2016 and 2015 included $1.4 billion and $169 million , respectively, from the acquisition of Universal Studios Japan. Our net income attributable to Comcast Corporation in 2016 and 2015 included $124 million and $18 million , respectively, from the acquisition of Universal Studios Japan. The following unaudited pro forma information has been presented as if the acquisition of Universal Studios Japan occurred on January 1, 2014. This information is primarily based on historical results of operations, adjusted for the allocation of purchase price, and is not necessarily indicative of what our results would have been had we operated Universal Studios Japan since January 1, 2014. No pro forma adjustments have been made for our transaction-related expenses. Year ended December 31 (in millions, except per share amounts) 2015 2014 Revenue $ 75,563 $ 69,860 Net income $ 8,591 $ 8,704 Net income attributable to Comcast Corporation $ 8,253 $ 8,435 Basic earnings per common share attributable to Comcast Corporation shareholders $ 3.32 $ 3.27 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 3.28 $ 3.22 Time Warner Cable Merger and Related Divestiture Transactions On April 24, 2015, we and Time Warner Cable Inc. terminated our planned merger, and we terminated our related agreement with Charter Communications, Inc. to spin off, exchange and sell certain cable systems. In connection with these proposed transactions, we incurred incremental transaction-related expenses of $198 million and $237 million in 2015 and 2014, respectively. The transaction-related expenses are included primarily in other operating and administrative expenses, with $20 million recorded in depreciation and amortization expenses associated with the write-off of certain capitalized costs in 2015.
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Significant Transactions	Note 4: Significant Transactions 2016 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 equity contribution occurred on the date of Comcast’s acquisition. Preliminary Allocation of Purchase Price The transaction was accounted for under the acquisition method of accounting and, accordingly, the assets and liabilities are to be recorded at their fair market values as of the acquisition date. We recorded the acquired assets and liabilities of DreamWorks Animation at their estimated fair values based on preliminary valuation analyses. In valuing acquired assets and liabilities, fair value estimates are 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. We will adjust the assets and liabilities as valuations are completed and we obtain information necessary to complete the analyses, but no later than one year from the acquisition date. The table below presents the preliminary allocation of the purchase price to the assets and liabilities of DreamWorks Animation. Preliminary Allocation of Purchase Price (in millions) Film and television costs (see Note 6) $ 854 Intangible assets (see Note 9) 164 Working capital 248 Debt (see Note 10) (381 ) Tax receivable agreement (a) (146 ) Other noncurrent assets and liabilities and other (b) 503 Identifiable net assets (liabilities) acquired 1,242 Noncontrolling interest (89 ) Goodwill (see Note 9) 2,620 Cash consideration transferred by Comcast $ 3,773 (a) The tax receivable agreement was settled immediately following the acquisition and the payment was recorded as an operating activity in our consolidated statement of cash flows. Comcast made a separate cash capital contribution of $146 million to fund the settlement which was recorded as a financing activity in our consolidated statement of cash flows. (b) Other included $353 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 2016. 2015 Universal Studios Japan On November 13, 2015, we acquired a 51% economic interest in Universal Studios Japan for $1.5 billion . Universal Studios Japan is a VIE based on the governance structure and we consolidate Universal Studios Japan since we have the power to direct activities that most significantly impact its economic performance. There are no liquidity arrangements, guarantees or other financial commitments between us and Universal Studios Japan, and therefore our maximum risk of financial loss is our 51% interest. Universal Studios Japan’s results of operations are reported in our Theme Parks segment following the acquisition date. Allocation of Purchase Price The transaction was accounted for under the acquisition method of accounting and, accordingly, the acquired assets and liabilities and the 49% noncontrolling interest were recorded at their estimated fair values. In 2016, we updated the allocation of the purchase price for Universal Studios Japan based on final valuation analyses, which primarily resulted in increases to property and equipment and intangible assets and a decrease in goodwill. The changes did not have a material impact on our consolidated financial statements. The table below presents the allocation of the purchase price to the assets and liabilities of Universal Studios Japan. Allocation of Purchase Price (in millions) Property and equipment (see Note 8) $ 780 Intangible assets (see Note 9) 323 Working capital (33 ) Debt (see Note 10) (3,271 ) Other noncurrent assets and liabilities and other 17 Identifiable net assets (liabilities) acquired (2,184 ) Noncontrolling interest (1,440 ) Goodwill (see Note 9) 5,123 Cash consideration transferred $ 1,499 Actual and Unaudited Pro Forma Results Our consolidated revenue in 2016 and 2015 included $1.4 billion and $169 million , respectively, from the acquisition of Universal Studios Japan. Our net income attributable to NBCUniversal in 2016 and 2015 included $124 million and $18 million , respectively, from the acquisition of Universal Studios Japan. The following unaudited pro forma information has been presented as if the acquisition of Universal Studios Japan occurred on January 1, 2014. This information is primarily based on historical results of operations, adjusted for the allocation of purchase price, and is not necessarily indicative of what our results would have been had we operated Universal Studios Japan since January 1, 2014. No pro forma adjustments have been made for our transaction-related expenses. Year ended December 31 (in millions) 2015 2014 Revenue $ 29,514 $ 26,513 Net income $ 3,801 $ 3,409 Net income attributable to NBCUniversal $ 3,503 $ 3,170

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2016
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Related Party Transactions	Note 5: 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. In September 2016, as part of the Comcast cash management process, we and Comcast amended and restated our revolving credit agreements to increase the amount that we can borrow from Comcast and that Comcast can borrow from us from $3 billion to $5 billion and to extend the maturity date to 2026. Amounts owed by us to Comcast or to us by Comcast under the revolving credit agreement, including accrued interest, are presented under the captions “note payable to Comcast” and “note receivable from Comcast,” respectively, in our consolidated balance sheet and are presented as current as there are daily borrowings and repayments throughout the year based on our working capital needs. The revolving credit agreements bear interest at floating rates equal to the interest rate calculation under Comcast’s revolving credit facility. The interest rate on Comcast’s revolving credit facility consists of a base rate plus a borrowing margin that is determined based on Comcast’s credit rating. As of December 31, 2016 , the borrowing margin for London Interbank Offered Rate-based borrowings was 1.00% . Comcast is also the counterparty to one of our contractual obligations. As of both December 31, 2016 and 2015 , 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 consolidated financial statements. Consolidated Balance Sheet December 31 (in millions) 2016 2015 Transactions with Comcast and Consolidated Subsidiaries Receivables, net $ 285 $ 239 Accounts payable and accrued expenses related to trade creditors $ 55 $ 68 Accrued expenses and other current liabilities $ 4 $ 51 Note payable to Comcast $ 2,703 $ 1,750 Other noncurrent liabilities $ 389 $ 383 Consolidated Statement of Income Year ended December 31 (in millions) 2016 2015 2014 Transactions with Comcast and Consolidated Subsidiaries Revenue $ 1,742 $ 1,349 $ 1,315 Operating costs and expenses $ (220 ) $ (246 ) $ (162 ) Other income (expense) $ (69 ) $ (37 ) $ (43 ) Distributions to NBCUniversal Holdings In addition to the transactions amounts presented in the table above, we make distributions to NBCUniversal Holdings on a periodic basis to enable its owners to meet their obligations to pay taxes on taxable income generated by our businesses. We also make quarterly distributions to NBCUniversal Holdings to enable it to make its required quarterly payments to NBCUniversal Enterprise at an annual rate of 8.25% on the $9.4 billion aggregate liquidation preference of its preferred units. These distributions are presented under the caption “distributions to member” in our consolidated statement of cash flows.

Film and Television Costs

Film and Television Costs	12 Months Ended
	Dec. 31, 2016
Film And Television Cost [Line Items]
Film and Television Costs	Note 6: Film and Television Costs December 31 (in millions) 2016 2015 Film Costs: Released, less amortization $ 1,750 $ 1,275 Completed, not released 50 226 In production and in development 1,310 907 3,110 2,408 Television Costs: Released, less amortization 1,953 1,573 In production and in development 853 737 2,806 2,310 Programming rights, less amortization 2,586 2,350 8,502 7,068 Less: Current portion of programming rights 1,250 1,213 Film and television costs $ 7,252 $ 5,855 Based on our current estimates of the total remaining revenue from all sources (“ultimate revenue”), in 2017 we expect to amortize approximately $1.9 billion of film and television costs associated with our original film and television productions that have been released, or are completed and have not been released. Through 2019, we expect to amortize approximately 88% of unamortized film and television costs for our released productions, excluding amounts allocated to acquired libraries. As of December 31, 2016 , acquired film and television libraries, which are included within the “released, less amortization” captions in the table above, had remaining unamortized costs of $596 million . These costs are generally amortized over a period not to exceed 20 years, and approximately 45% of these costs are expected to be amortized through 2019. Capitalization of Film and Television Costs We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to programming and production expenses. We generally record the amortization and the accrued costs using the individual film forecast computation method, which amortizes the costs in the same ratio as the associated ultimate revenue. Estimates of ultimate revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the distribution of a film in movie theaters or the licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of them. In determining the method of amortization and estimated life of an acquired film or television library, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset. When an event or a change in circumstance occurs that was known or knowable as of the balance sheet date and that indicates the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film’s fair value. The estimated fair value of a production is based on Level 3 inputs that primarily use an analysis of future expected cash flows. Adjustments to capitalized film and stage play production costs of $14 million , $42 million and $26 million were recorded in 2016 , 2015 and 2014 , respectively. We enter into cofinancing arrangements with third parties to jointly finance or distribute certain of our film productions. Cofinancing arrangements can take various forms, but in most cases involve the grant of an economic interest in a film to an investor. The number of investors and the terms of these arrangements can vary, although investors generally assume the full risks and rewards for the portion of the film acquired in these arrangements. We account for the proceeds received from a third-party investor under these arrangements as a reduction to our capitalized film costs. Under these arrangements, the investor owns an undivided copyright interest in the film, and therefore in each period we record either a charge or a benefit to programming and production expenses to reflect the estimate of the third-party investor’s interest in the profit or loss of the film. The estimate of the third-party investor’s interest in the profit or loss of a film is determined using the ratio of actual revenue earned to date to the ultimate revenue expected to be recognized over the film’s useful life. We capitalize the costs of programming content that we license but do not own, including rights to multiyear, live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is made available for use. We amortize capitalized programming costs as the associated programs are broadcast. We generally amortize multiyear, live-event sports programming rights using the ratio of the current period revenue to the estimated ultimate revenue or under the terms of the contract. Acquired programming costs are recorded at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Programming acquired by our Cable Networks segment is primarily tested on a channel basis for impairment, whereas programming acquired by our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we recognize an impairment charge to programming and production expenses.
NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Film and Television Costs	Note 6: Film and Television Costs December 31 (in millions) 2016 2015 Film Costs: Released, less amortization $ 1,750 $ 1,275 Completed, not released 50 226 In production and in development 1,310 907 3,110 2,408 Television Costs: Released, less amortization 1,953 1,573 In production and in development 853 737 2,806 2,310 Programming rights, less amortization 2,570 2,329 8,486 7,047 Less: Current portion of programming rights 1,241 1,200 Film and television costs $ 7,245 $ 5,847 Based on our current estimates of the total remaining revenue from all sources (“ultimate revenue”), in 2017 we expect to amortize approximately $1.9 billion of film and television costs associated with our original film and television productions that have been released, or are completed and have not been released. Through 2019, we expect to amortize approximately 88% of unamortized film and television costs for our released productions, excluding amounts allocated to acquired libraries. As of December 31, 2016 , acquired film and television libraries, which are included within the “released, less amortization” captions in the table above, had remaining unamortized costs of $596 million . These costs are generally amortized over a period not to exceed 20 years, and approximately 45% of these costs are expected to be amortized through 2019. Capitalization of Film and Television Costs We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to programming and production expenses. We generally record the amortization and the accrued costs using the individual film forecast computation method, which amortizes the costs in the same ratio as the associated ultimate revenue. Estimates of ultimate revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the distribution of a film in movie theaters or the licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of them. In determining the method of amortization and estimated life of an acquired film or television library, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset. When an event or a change in circumstance occurs that was known or knowable as of the balance sheet date and that indicates the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film’s fair value. The estimated fair value of a production is based on Level 3 inputs that primarily use an analysis of future expected cash flows. Adjustments to capitalized film and stage play production costs of $14 million , $42 million and $26 million were recorded in 2016 , 2015 and 2014 , respectively. We enter into cofinancing arrangements with third parties to jointly finance or distribute certain of our film productions. Cofinancing arrangements can take various forms, but in most cases involve the grant of an economic interest in a film to an investor. The number of investors and the terms of these arrangements can vary, although investors generally assume the full risks and rewards for the portion of the film acquired in these arrangements. We account for the proceeds received from a third-party investor under these arrangements as a reduction to our capitalized film costs. Under these arrangements, the investor owns an undivided copyright interest in the film, and therefore in each period we record either a charge or a benefit to programming and production expenses to reflect the estimate of the third-party investor’s interest in the profit or loss of the film. The estimate of the third-party investor’s interest in the profit or loss of a film is determined using the ratio of actual revenue earned to date to the ultimate revenue expected to be recognized over the film’s useful life. We capitalize the costs of programming content that we license but do not own, including rights to multiyear, live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is made available for use. We amortize capitalized programming costs as the associated programs are broadcast. We generally amortize multiyear, live-event sports programming rights using the ratio of the current period revenue to the estimated ultimate revenue or under the terms of the contract. Acquired programming costs are recorded at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Programming acquired by our Cable Networks segment is primarily tested on a channel basis for impairment, whereas programming acquired by our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we recognize an impairment charge to programming and production expenses.

Investments

Investments	12 Months Ended
	Dec. 31, 2016
Fair Value, Equity And Cost Method Investments [Line Items]
Investments	Note 7: Investments December 31 (in millions) 2016 2015 Fair Value Method $ 198 $ 167 Equity Method: Atairos 1,601 — Hulu 225 184 Other 550 494 2,376 678 Cost Method: AirTouch 1,599 1,583 BuzzFeed 400 200 Other 771 702 2,770 2,485 Total investments 5,344 3,330 Less: Current investments 97 106 Noncurrent investments $ 5,247 $ 3,224 Investment Income (Loss), Net Year ended December 31 (in millions) 2016 2015 2014 Gains on sales and exchanges of investments, net $ 46 $ 12 $ 192 Investment impairment losses (34 ) (59 ) (50 ) Unrealized gains on securities underlying prepaid forward sale agreements — 42 66 Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments (4 ) (42 ) (56 ) Interest and dividend income 123 115 116 Other, net 82 13 28 Investment income (loss), net $ 213 $ 81 $ 296 Fair Value Method We classify publicly traded investments that are not accounted for under the equity method as available-for-sale (“AFS”) or trading securities and record them at fair value. For AFS securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of other comprehensive income (loss), except when we consider declines in value to be other than temporary. For trading securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of investment income (loss), net. We recognize realized gains and losses associated with our fair value method investments using the specific identification method. We classify the cash flows related to purchases of and proceeds from the sale of trading securities based on the nature of the securities and the purpose for which they were acquired. Equity Method We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee’s operating and financial policies or in which we hold a significant partnership or LLC interest. Equity method investments are recorded at cost and are adjusted to recognize (1) our proportionate share of the investee’s net income or loss after the date of investment, (2) amortization of the recorded investment that exceeds our share of the book value of the investee’s net assets, (3) additional contributions made and dividends received, and (4) impairments resulting from other-than-temporary declines in fair value. For some investments, we record our share of the investee’s net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net. If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income. Atairos In 2015, we entered into an agreement to establish Atairos Group, Inc., a strategic company focused on investing in and operating companies in a range of industries and business sectors, both domestically and internationally. The agreement became effective as of January 1, 2016. Atairos has a term of up to 12 years and is controlled by management companies led by our former CFO through interests that carry all of the voting rights. We are the only investor other than our former CFO and the other management company employees. We have committed to fund Atairos up to $4 billion in the aggregate at any one time, subject to certain offsets, and $40 million annually for a management fee, subject to certain adjustments, while the management company investors have committed to fund up to $100 million , with at least $40 million to be funded by our former CFO, subject to his continued role with Atairos. Our economic interests do not carry voting rights and obligate us to absorb approximately 99% of any losses and they provide us the right to receive approximately 86.5% of any residual returns in Atairos, in either case on a cumulative basis. We have concluded that Atairos is a VIE, that we do not have the power to direct the activities that most significantly impact the economic performance of Atairos as we have no voting rights and only certain consent rights, and that we are not a related party with our former CFO or the management companies. We therefore do not consolidate Atairos and account for our investment as an equity method investment. There are no other liquidity arrangements, guarantees or other financial commitments between Comcast and Atairos, and therefore our maximum risk of financial loss is our investment balance and remaining unfunded capital commitment. In 2016, we made cash capital contributions totaling $1.2 billion to Atairos. In addition, we recorded capital contributions of $447 million that were accrued in 2016 and paid in January 2017. Hulu In August 2016, Time Warner Inc. acquired a 10% interest in Hulu, LLC, which diluted our interest in Hulu from 33% to 30% . For a period not to exceed 3 years , Time Warner may put its shares to Hulu or Hulu may call Time Warner’s shares under certain limited circumstances arising from regulatory review. Given the contingent nature of the put and call options, we recorded a deferred gain of $159 million and a corresponding increase to our investment in Hulu as a result of the dilution. The deferred gain will be recognized in other income (expense), net if and when the options expire unexercised. In 2016 , 2015 and 2014 , we recognized our proportionate share of losses of $168 million , $106 million and $20 million , respectively, related to our investment in Hulu. 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. In June and December 2015, The Weather Channel recorded impairment charges related to goodwill. In 2015, we recorded expenses of $333 million that represented NBCUniversal’s proportionate share of these impairment charges in equity in net income (losses) of investees, net in our consolidated statement of income. Cost Method We use the cost method to account for investments not accounted for under the fair value method or the equity method. AirTouch We hold two series of preferred stock of Verizon Americas, Inc., formerly known as AirTouch Communications, Inc., a subsidiary of Verizon Communications Inc., which are redeemable in April 2020. As of both December 31, 2016 and 2015 , the estimated fair value of the AirTouch preferred stock was $1.7 billion . The dividend and redemption activity of the AirTouch preferred stock determines the dividend and redemption payments associated with substantially all of the preferred shares issued by one of our consolidated subsidiaries, which is a VIE. The subsidiary has three series of preferred stock outstanding with an aggregate redemption value of $1.75 billion . Substantially all of the AirTouch preferred stock is redeemable in April 2020 at a redemption value of $1.65 billion . As of both December 31, 2016 and 2015 , the two series of redeemable subsidiary preferred shares were recorded at $1.6 billion , and those amounts are included in other noncurrent liabilities. As of both December 31, 2016 and 2015 , the liability related to the redeemable subsidiary preferred shares had an aggregate estimated fair value of $1.7 billion . The estimated fair values of the AirTouch preferred stock and redeemable subsidiary preferred shares 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. The one series of nonredeemable subsidiary preferred shares was recorded at $100 million as of both December 31, 2016 and 2015 , and those amounts are included in noncontrolling interests in our consolidated balance sheet. The carrying amount of the nonredeemable subsidiary preferred stock approximates its fair value. BuzzFeed and Vox Media In September 2015, NBCUniversal acquired an interest in BuzzFeed, Inc. and made an additional investment in Vox Media, Inc. for $200 million each in cash. In November 2016, NBCUniversal made an additional investment of $200 million in BuzzFeed. BuzzFeed is a global media company that produces and distributes original news, entertainment and videos. Vox Media is a digital media company comprised of eight distinct brands. Impairment Testing of Investments We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our AFS securities and our cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net.
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Investments	Note 7: Investments December 31 (in millions) 2016 2015 Fair Value Method $ 6 $ 10 Equity Method: Hulu 225 184 Other 336 313 561 497 Cost Method: BuzzFeed 400 200 Other 296 258 696 458 Total investments $ 1,263 $ 965 Equity Method We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee’s operating and financial policies or in which we hold a significant partnership or LLC interest. Equity method investments are recorded at cost and are adjusted to recognize (1) our proportionate share of the investee’s net income or loss after the date of investment, (2) amortization of the recorded investment that exceeds our share of the book value of the investee’s net assets, (3) additional contributions made and dividends received, and (4) impairments resulting from other-than-temporary declines in fair value. For some investments, we record our share of the investee’s net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net. If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income. Hulu In August 2016, Time Warner Inc. acquired a 10% interest in Hulu, LLC, which diluted our interest in Hulu from 33% to 30% . For a period not to exceed 3 years , Time Warner may put its shares to Hulu or Hulu may call Time Warner’s shares under certain limited circumstances arising from regulatory review. Given the contingent nature of the put and call options, we recorded a deferred gain of $159 million and a corresponding increase to our investment in Hulu as a result of the dilution. The deferred gain will be recognized in other income (expense), net if and when the options expire unexercised. In 2016 , 2015 and 2014 , we recognized our proportionate share of losses of $168 million , $106 million and $20 million , respectively, related to our investment in Hulu. 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. In June and December 2015, The Weather Channel recorded impairment charges related to goodwill. In 2015, we recorded expenses of $333 million that represented NBCUniversal’s proportionate share of these impairment charges in equity in net income (losses) of investees, net in our consolidated statement of income. Summarized Financial Information The tables below present the summarized combined financial information of our equity method investments. December 31 (in millions) 2016 2015 Current assets $ 2,105 $ 1,904 Noncurrent assets $ 2,724 $ 3,584 Current liabilities $ 1,921 $ 1,225 Noncurrent liabilities $ 2,853 $ 4,879 Year ended December 31 (in millions) 2016 2015 2014 Revenue $ 4,285 $ 3,944 $ 3,756 Operating income (loss) $ (182 ) $ (1,609 ) $ 483 Net income (loss) $ (313 ) $ (1,820 ) $ 243 Cost Method We use the cost method to account for investments not accounted for under the fair value method or the equity method. In September 2015, we acquired an interest in BuzzFeed, Inc. and made an additional investment in Vox Media, Inc. for $200 million each in cash. In November 2016, NBCUniversal made an additional investment of $200 million in BuzzFeed. BuzzFeed is a global media company that produces and distributes original news, entertainment and videos. Vox Media is a digital media company comprised of eight distinct brands. Impairment Testing of Investments We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our available-for-sale securities and our cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and Equipment	Note 8: Property and Equipment December 31 (in millions) Weighted-Average 2016 2015 Cable distribution system 11 years $ 34,028 $ 32,586 Customer premise equipment 6 years 28,621 28,559 Other equipment 8 years 9,475 8,539 Buildings and leasehold improvements 29 years 12,550 10,829 Land N/A 1,273 1,252 Property and equipment, at cost 85,947 81,765 Less: Accumulated depreciation 49,694 48,100 Property and equipment, net $ 36,253 $ 33,665 Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. We record depreciation using the straight-line method over the asset’s estimated useful life. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense. In accordance with the accounting guidance related to cable television companies, we capitalize the costs associated with the construction of and improvements to our cable transmission and distribution facilities, including scalable infrastructure and line extensions; costs associated with acquiring and deploying new customer premise equipment; and costs associated with installation of our services. Costs capitalized include all direct costs for labor and materials, as well as various indirect costs. Costs incurred in connection with subsequent disconnects and reconnects are expensed as they are incurred. We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.
NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	Note 8: Property and Equipment December 31 (in millions) Weighted-Average 2016 2015 Buildings and leasehold improvements 30 years $ 7,543 $ 6,543 Furniture, fixtures and equipment 11 years 4,158 3,457 Construction in process N/A 1,176 1,339 Land N/A 984 961 Property and equipment, at cost 13,861 12,300 Less: Accumulated depreciation 3,350 2,779 Property and equipment, net $ 10,511 $ 9,521 Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. We record depreciation using the straight-line method over the asset’s estimated useful life. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense. We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2016
Goodwill And Intangible Assets [Line Items]
Goodwill and Intangible Assets	Note 9: Goodwill and Intangible Assets Goodwill NBCUniversal (in millions) Cable Cable Broadcast Filmed Theme Corporate Total Balance, December 31, 2014 $ 12,217 $ 12,948 $ 767 $ 211 $ 982 $ 191 $ 27,316 Acquisitions (a) 173 17 39 58 5,373 1 5,661 Adjustments (1 ) — — — — — (1 ) Foreign currency translation — (18 ) — (2 ) (11 ) — (31 ) Balance, December 31, 2015 12,389 12,947 806 267 6,344 192 32,945 Acquisitions (b) 82 232 — 2,717 — 1 3,032 Adjustments (c) 174 — — — (250 ) (181 ) (257 ) Foreign currency translation — 4 — 9 247 — 260 Balance, December 31, 2016 $ 12,645 $ 13,183 $ 806 $ 2,993 $ 6,341 $ 12 $ 35,980 (a) Acquisitions in 2015 in our Theme Parks segment included the Universal Studios Japan transaction (see Note 5 for additional information). (b) Acquisitions in 2016 in our Filmed Entertainment segment primarily included the DreamWorks Animation acquisition (see Note 5 for additional information). (c) Adjustments in 2016 primarily included the updated allocation of the purchase price for Universal Studios Japan in our Theme Parks segment (see Note 5 for additional information) and the reclassification of certain operations and businesses from Corporate and Other to our Cable Communications segment. Goodwill is calculated as the excess of the consideration transferred over the identifiable net assets acquired in a business combination and represents the future economic benefits expected to arise from anticipated synergies and intangible assets acquired that do not qualify for separate recognition, including assembled workforce, noncontractual relationships and other agreements. We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the carrying amount of a reporting unit may exceed its fair value. We test goodwill for impairment at the reporting unit level. To determine our reporting units, we evaluate the components one level below the segment level and we aggregate the components if they have similar economic characteristics. As a result of this assessment, our reporting units are the same as our five reportable segments. We evaluate the determination of our reporting units used to test for impairment periodically or whenever events or substantive changes in circumstances occur. The assessment of recoverability may first consider qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. The quantitative assessment considers whether the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit’s goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any impairment charges in any of the periods presented. Intangible Assets 2016 2015 December 31 (in millions) Weighted-Average Original Useful Life as of December 31, 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Indefinite-Lived Intangible Assets: Franchise rights N/A $ 59,364 $ 59,364 Trade names N/A 2,981 2,857 FCC licenses N/A 651 651 Finite-Lived Intangible Assets: Customer relationships 19 years 13,478 $ (5,110 ) 13,396 $ (4,442 ) Software 4 years 7,017 (3,997 ) 6,008 (3,429 ) Cable franchise renewal costs and contractual operating rights 9 years 1,460 (800 ) 1,499 (849 ) Patents and other technology rights 7 years 257 (208 ) 409 (350 ) Other agreements and rights 15 years 2,443 (898 ) 1,994 (798 ) Total $ 87,651 $ (11,013 ) $ 86,178 $ (9,868 ) Indefinite-Lived Intangible Assets Indefinite-lived intangible assets consist primarily of our cable franchise rights. Our cable franchise rights represent the values we attributed to agreements with state and local authorities that allow access to homes and businesses in cable service areas acquired in business combinations. We do not amortize our cable franchise rights because we have determined that they meet the definition of indefinite-lived intangible assets since there are no legal, regulatory, contractual, competitive, economic or other factors which limit the period over which these rights will contribute to our cash flows. We reassess this determination periodically or whenever events or substantive changes in circumstances occur. Costs we incur in negotiating and renewing cable franchise agreements are included in other intangible assets and are generally amortized on a straight-line basis over the term of the franchise agreement. We assess the recoverability of our cable franchise rights and other indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. Our three Cable Communications divisions represent the unit of account we use to test for impairment of our cable franchise rights. We evaluate the unit of account used to test for impairment of our cable franchise rights and other indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The assessment of recoverability may first consider qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. When performing a quantitative assessment, we estimate the fair value of our cable franchise rights and other indefinite-lived intangible assets primarily based on a discounted cash flow analysis that involves significant judgment. When analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the fair value of our cable franchise rights or other indefinite-lived intangible assets was less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any material impairment charges in any of the periods presented. Finite-Lived Intangible Assets Estimated Amortization Expense of Finite-Lived Intangible Assets (in millions) 2017 $ 2,077 2018 $ 1,828 2019 $ 1,475 2020 $ 1,168 2021 $ 939 Finite-lived intangible assets are subject to amortization and consist primarily of customer relationships acquired in business combinations, software, cable franchise renewal costs, contractual operating rights and intellectual property rights. Our finite-lived intangible assets are amortized primarily on a straight-line basis over their estimated useful life or the term of the associated agreement. We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs in other intangible assets and generally amortize them on a straight-line basis over a period not to exceed five years . We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware. We evaluate the recoverability of our finite-lived intangible assets whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
NBCUniversal Media LLC [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill and Intangible Assets	Note 9: Goodwill and Intangible Assets Goodwill (in millions) Cable Broadcast Filmed Theme Total Balance, December 31, 2014 $ 12,948 $ 767 $ 211 $ 982 $ 14,908 Acquisitions (a) 17 39 58 5,373 5,487 Foreign currency translation (18 ) — (2 ) (11 ) (31 ) Balance, December 31, 2015 12,947 806 267 6,344 20,364 Acquisitions (b) 232 — 2,717 — 2,949 Adjustments (c) — — — (250 ) (250 ) Foreign currency translation 4 — 9 247 260 Balance, December 31, 2016 $ 13,183 $ 806 $ 2,993 $ 6,341 $ 23,323 (a) Acquisitions in 2015 in our Theme Parks segment included the Universal Studios Japan transaction (see Note 4 for additional information). (b) Acquisitions in 2016 in our Filmed Entertainment segment primarily included the DreamWorks Animation acquisition (see Note 4 for additional information). (c) Adjustments in 2016 included the updated allocation of the purchase price for Universal Studios Japan in our Theme Parks segment (see Note 4 for additional information). Goodwill is calculated as the excess of the consideration transferred over the identifiable net assets acquired in a business combination and represents the future economic benefits expected to arise from anticipated synergies and intangible assets acquired that do not qualify for separate recognition, including assembled workforce, noncontractual relationships and other agreements. We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the carrying amount of a reporting unit may exceed its fair value. We test goodwill for impairment at the reporting unit level. To determine our reporting units, we evaluate the components one level below the segment level and we aggregate the components if they have similar economic characteristics. As a result of this assessment, our reporting units are the same as our four reportable segments. We evaluate the determination of our reporting units used to test for impairment periodically or whenever events or substantive changes in circumstances occur. The assessment of recoverability may first consider qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. The quantitative assessment considers whether the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit’s goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any impairment charges in any of the periods presented. Intangible Assets 2016 2015 December 31 (in millions) Weighted-Average Gross Accumulated Gross Accumulated Finite-Lived Intangible Assets: Customer relationships 19 years $ 13,173 $ (4,952 ) $ 13,107 $ (4,291 ) Software 5 years 1,195 (563 ) 849 (431 ) Other 15 years 2,345 (1,053 ) 1,996 (932 ) Indefinite-Lived Intangible Assets: Trade names N/A 2,981 2,857 FCC licenses N/A 651 651 Total $ 20,345 $ (6,568 ) $ 19,460 $ (5,654 ) Indefinite-Lived Intangible Assets Indefinite-lived intangible assets consist of trade names and FCC licenses. We assess the recoverability of our indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. We evaluate the unit of account used to test for impairment of our indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The assessment of recoverability may first consider qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. When performing a quantitative assessment, we estimate the fair value of our indefinite-lived intangible assets primarily based on a discounted cash flow analysis that involves significant judgment. When analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the fair value of our indefinite-lived intangible assets was less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any material impairment charges in any of the periods presented. Finite-Lived Intangible Assets Estimated Amortization Expense of Finite-Lived Intangible Assets (in millions) 2017 $ 946 2018 $ 929 2019 $ 900 2020 $ 873 2021 $ 804 Finite-lived intangible assets are subject to amortization and consist primarily of customer relationships acquired in business combinations, intellectual property rights and software. Our finite-lived intangible assets are amortized primarily on a straight-line basis over their estimated useful life or the term of the associated agreement. We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs in intangible assets and generally amortize them on a straight-line basis over a period not to exceed five years . We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware. We evaluate the recoverability of our finite-lived intangible assets whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2016
Debt Instrument [Line Items]
Long-Term Debt	Note 10: Long-Term Debt Long-Term Debt Outstanding December 31 (in millions) Weighted-Average Interest Rate as of December 31, 2016 2016 2015 Commercial paper 1.01 % $ 2,781 $ 975 Revolving bank credit facilities — % — — Term loans (a) 2.93 % 3,262 3,259 Senior notes with maturities of 5 years or less, at face value 4.68 % 13,850 14,300 Senior notes with maturities between 5 and 10 years, at face value 3.86 % 12,049 9,630 Senior notes with maturities greater than 10 years, at face value (b) 5.19 % 28,587 23,925 Other, including capital lease obligations — 842 794 Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net — (325 ) (262 ) Total debt 4.50 % (c) 61,046 52,621 Less: Current portion 5,480 3,627 Long-term debt $ 55,566 $ 48,994 (a) The December 31, 2016 and 2015 amounts consist of ¥382 billion and ¥400 billion , respectively, of Universal Studios Japan term loans translated using the exchange rates as of these dates. (b) The December 31, 2016 and 2015 amounts include £625 million of 5.50% notes due 2029, which translated to $771 million and $921 million , respectively, using the exchange rates as of these dates. (c) Includes the effects of our derivative financial instruments. As of December 31, 2016 and 2015 , our debt had an estimated fair value of $66.3 billion and $58.0 billion , respectively. The estimated fair value of our publicly traded debt is 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 is based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities. See Note 19 for additional information on our cross-guarantee structure. Principal Maturities of Debt (in millions) Weighted-Average 2017 4.22 % $ 5,483 2018 4.05 % $ 4,203 2019 3.11 % $ 2,466 2020 4.18 % $ 6,217 2021 4.36 % $ 2,043 Thereafter 4.82 % $ 40,959 2016 Debt Borrowings Year ended December 31, 2016 (in millions) Comcast 3.15% senior notes due 2026 $ 2,200 Comcast 4.05% senior notes due 2046 1,430 Comcast 2.35% senior notes due 2027 1,400 Comcast 3.40% senior notes due 2046 1,400 Comcast 2.75% senior notes due 2023 1,100 Comcast 3.20% senior notes due 2036 1,000 Comcast 1.625% senior notes due 2022 700 Other 1 Total $ 9,231 2016 Debt Redemptions and Repayments Year ended December 31, 2016 (in millions) NBCUniversal 2.875% senior notes due 2016 $ 1,000 Comcast 4.95% senior notes due 2016 750 NBCUniversal Enterprise senior notes due 2016 700 DreamWorks Animation assumed debt (see Note 5) 381 Other 221 Total $ 3,052 Debt Instruments Revolving Bank Credit Facilities In May 2016, we entered into a new $7 billion revolving credit facility due 2021 with a syndicate of banks (“Comcast revolving credit facility”) that may be used for general corporate purposes. We may increase the commitment under the Comcast revolving credit facility up to a total of $10 billion , as well as extend the expiration date to a date no later than 2023, subject to approval of the lenders. In addition, NBCUniversal Enterprise entered into a new $1.5 billion revolving credit facility due 2021 with a syndicate of banks (“NBCUniversal Enterprise revolving credit facility”) that may be used for general corporate purposes. We may increase the commitment under the NBCUniversal Enterprise revolving credit facility up to a total of $2 billion , as well as extend the expiration date to a date no later than 2023, subject to approval of the lenders. The new revolving credit facilities replaced Comcast’s $6.25 billion and NBCUniversal Enterprise’s $1.35 billion revolving credit facilities, which were terminated in connection with the execution of the new revolving credit facilities. The interest rates on the new revolving credit facilities consist of a base rate plus a borrowing margin that is determined based on Comcast’s credit rating. As of December 31, 2016 , the borrowing margin for borrowings based on the London Interbank Offered Rate was 1.00% . Similar to the Comcast and NBCUniversal Enterprise prior revolving credit facilities, each of the new revolving credit facilities require that we maintain certain financial ratios based on their respective debt and operating income before depreciation and amortization, as defined in the credit facility. We were in compliance with all financial covenants for all periods presented. As of December 31, 2016 , amounts available under our consolidated credit facilities, net of amounts outstanding under our commercial paper programs and outstanding letters of credit, totaled $5.5 billion , which included $460 million available under the NBCUniversal Enterprise revolving credit facility. Commercial Paper Programs Our commercial paper programs provide a lower-cost source of borrowing to fund our short-term working capital requirements. The maximum borrowing capacity under the Comcast commercial paper program is $6.25 billion . We support this commercial paper program with unused capacity under the Comcast revolving credit facility. The maximum borrowing capacity under the NBCUniversal Enterprise commercial paper program is $1.35 billion . We support this commercial paper program with unused capacity under the NBCUniversal Enterprise revolving credit facility. Term Loans Our term loans consist of the Universal Studios Japan term loans, which have a final maturity of November 2020 . These term loans contain financial and operating covenants and are secured by the assets of Universal Studios Japan and the equity interests of the other investors. We do not guarantee these term loans and they are otherwise nonrecourse to us. Letters of Credit As of December 31, 2016 , we and certain of our subsidiaries had unused irrevocable standby letters of credit totaling $443 million to cover potential fundings under various agreements.
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Long-Term Debt	Note 10: Long-Term Debt Long-Term Debt Outstanding December 31 (in millions) Weighted-Average Interest Rate as of December 31, 2016 2016 2015 Term loans (a) 2.93 % $ 3,262 $ 3,259 Senior notes with maturities of 5 years or less, at face value 4.76 % 4,000 3,000 Senior notes with maturities between 5 and 10 years, at face value 2.88 % 1,000 3,000 Senior notes with maturities greater than 10 years, at face value 5.62 % 3,200 3,200 Other, including capital lease obligations — 138 47 Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net — (12 ) (12 ) Total debt 4.38 % (b) 11,588 12,494 Less: Current portion 127 1,163 Long-term debt $ 11,461 $ 11,331 (a) The December 31, 2016 and 2015 amounts consist of ¥382 billion and ¥400 billion , respectively, of Universal Studios Japan term loans translated using the exchange rates as of these dates. (b) Includes the effects of our derivative financial instruments. As of December 31, 2016 and 2015 , our debt, excluding the note payable to Comcast, had an estimated fair value of $12.6 billion and $13.4 billion , respectively. The estimated fair value of our publicly traded debt is 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 is based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities. Principal Maturities of Debt (in millions) Weighted-Average 2017 2.94 % $ 127 2018 3.15 % $ 148 2019 2.74 % $ 247 2020 3.90 % $ 4,797 2021 4.40 % $ 2,008 Thereafter 5.04 % $ 4,273 Term Loans Our term loans consist of the Universal Studios Japan term loans, which have a final maturity of November 2020 . These term loans contain financial and operating covenants and are secured by the assets of Universal Studios Japan and the equity interests of the other investors. We do not guarantee these term loans and they are otherwise nonrecourse to us. Debt Repayments Following Comcast’s acquisition of DreamWorks Animation, we paid $381 million to settle all of the debt we assumed in the DreamWorks Animation acquisition. In April 2016, we repaid at maturity $1 billion aggregate principal amount of 2.875% senior notes due 2016 . Cross-Guarantee Structure We, Comcast and a 100% owned cable holding company subsidiary of Comcast (“CCCL Parent”) fully and unconditionally guarantee each other’s debt securities, including the $7 billion Comcast revolving credit facility due 2021. As of December 31, 2016 , outstanding debt securities of $44.7 billion of Comcast and CCCL Parent were subject to the guarantee structure. We do not, however, guarantee the obligations of NBCUniversal Enterprise with respect to its $3.3 billion aggregate principal amount of senior notes, $1.5 billion revolving credit facility, commercial paper program, or $725 million liquidation preference of Series A cumulative preferred stock.

Postretirement, Pension and Oth

Postretirement, Pension and Other Employee Benefit Plans	12 Months Ended
	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement, Pension and Other Employee Benefit Plans	Note 11: Postretirement, Pension and Other Employee Benefit Plans Postretirement Benefit Plans Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 538 $ 820 $ 837 Plan funded status and recorded benefit obligation $ (538 ) $ (820 ) $ (837 ) Portion of benefit obligation not yet recognized in benefits expense $ (372 ) $ (33 ) $ 46 Benefits expense $ 70 $ 75 $ 59 Discount rate 4.07-4.56% 4.70-4.73% 4.25 % We sponsor various benefit plans that provide postretirement benefits to eligible employees based on years of service. The Comcast Postretirement Healthcare Stipend Program (the “stipend plan”) provides an annual stipend for reimbursement of healthcare costs to each eligible employee based on years of service. Under the stipend plan, we are not exposed to the increasing costs of healthcare because the benefits are fixed at a predetermined amount. In December 2016, the stipend plan was amended primarily to reduce the benefits of active employees who retire after December 31, 2017. The plan amendments reduced our benefit obligation in 2016 by $361 million . NBCUniversal’s postretirement medical and life insurance plans provide continuous coverage to employees eligible to receive such benefits. A small number of eligible employees also participate in legacy plans of acquired companies. All of our postretirement benefit plans are unfunded and substantially all of our postretirement benefit obligations are recorded to noncurrent liabilities. The expense we recognize for our postretirement benefit plans is determined using certain assumptions, including the discount rate. Pension Plans NBCUniversal sponsors various qualified and nonqualified defined benefit pension plans for domestic employees. Since the future benefits have been frozen since the beginning of 2013, we did not recognize service costs related to the pension plans for all periods presented. The benefits expense we recognized for our defined benefit plans was not material for all periods presented. In addition to the defined benefit plans it sponsors, NBCUniversal is also obligated to reimburse General Electric (“GE”) for future benefit payments to those participants who were vested in the supplemental pension plan sponsored by GE at the time of the NBCUniversal transaction in 2011. These pension plans are currently unfunded and we recorded a benefit obligation of $314 million and $309 million as of December 31, 2016 and 2015 , respectively, which consists primarily of our obligations to reimburse GE. Other Employee Benefits Deferred Compensation Plans We maintain unfunded, nonqualified deferred compensation plans for certain members of management and nonemployee directors (each, a “participant”). The amount of compensation deferred by each participant is based on participant elections. Participant accounts, except for those in the NBCUniversal plan, are credited with income primarily based on a fixed annual rate. Participants in the NBCUniversal plan designate one or more valuation funds, independently established funds or indices that are used to determine the amount of investment gain or loss in the participant’s account. Participants are eligible to receive distributions from their account based on elected deferral periods that are consistent with the plans and applicable tax law. The table below presents the benefit obligation and interest expense for our deferred compensation plans. Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 2,164 $ 2,038 $ 1,774 Interest expense $ 178 $ 171 $ 149 We have purchased life insurance policies to recover a portion of the future payments related to our deferred compensation plans. As of December 31, 2016 and 2015 , the cash surrender value of these policies, which is recorded to other noncurrent assets, was $709 million and $658 million , respectively. Retirement Investment Plans We sponsor several 401(k) defined contribution retirement plans that allow eligible employees to contribute a portion of their compensation through payroll deductions in accordance with specified plan guidelines. We make contributions to the plans that include matching a percentage of the employees’ contributions up to certain limits. In 2016 , 2015 and 2014 , expenses related to these plans totaled $446 million , $416 million and $379 million , respectively. Multiemployer Benefit Plans We participate in various multiemployer benefit plans, including pension and postretirement benefit plans, that cover some of our employees and temporary employees who are represented by labor unions. We also participate in other multiemployer benefit plans that provide health and welfare and retirement savings benefits to active and retired participants. We make periodic contributions to these plans in accordance with the terms of applicable collective bargaining agreements and laws but do not sponsor or administer these plans. We do not participate in any multiemployer benefit plans for which we consider our contributions to be individually significant, and the largest plans in which we participate are funded at a level of 80% or greater. In 2016 , 2015 and 2014 , the total contributions we made to multiemployer pension plans were $84 million , $77 million and $58 million , respectively. In 2016 , 2015 and 2014 , the total contributions we made to multiemployer postretirement and other benefit plans were $136 million , $119 million and $125 million , respectively. If we cease to be obligated to make contributions or were to otherwise withdraw from participation in any of these plans, applicable law would require us to fund our allocable share of the unfunded vested benefits, which is known as a withdrawal liability. In addition, actions taken by other participating employers may lead to adverse changes in the financial condition of one of these plans, which could result in an increase in our withdrawal liability. Severance Benefits We provide severance benefits to certain former employees. A liability is recorded when payment is probable, the amount is reasonably estimable, and the obligation relates to rights that have vested or accumulated. In 2016 , 2015 and 2014 , we recorded severance costs of $315 million , $181 million and $152 million , respectively. Severance costs in 2016 included $61 million of severance costs associated with the acquisition of DreamWorks Animation.
NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement, Pension and Other Employee Benefit Plans	Note 11: Postretirement, Pension and Other Employee Benefit Plans Postretirement Benefit Plans Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 192 $ 197 $ 209 Plan funded status and recorded benefit obligation $ (192 ) $ (197 ) $ (209 ) Portion of benefit obligation not yet recognized in benefits expense $ (42 ) $ (27 ) $ (3 ) Benefits expense $ 13 $ 15 $ 12 Discount rate 4.56 % 4.73 % 4.25 % We have postretirement medical and life insurance plans that provide continuous coverage to employees eligible to receive such benefits and give credit for length of service provided before Comcast’s acquisition of a controlling interest in NBCUniversal Holdings in 2011 (the “joint venture transaction”). Substantially all of the employees that were contributed by Comcast as part of the joint venture transaction participate in a postretirement healthcare stipend program (the “stipend plan”). The stipend plan provides an annual stipend for reimbursement of healthcare costs to each eligible employee based on years of service. Under the stipend plan, we are not exposed to the increasing costs of healthcare because the benefits are fixed at a predetermined amount. All of our postretirement benefit plans are unfunded and substantially all of our postretirement benefit obligations are recorded to noncurrent liabilities. The expense we recognize for our postretirement benefit plans is determined using certain assumptions, including the discount rate. Pension Plans We sponsor various qualified and nonqualified defined benefit pension plans for domestic employees. Since the future benefits have been frozen since the beginning of 2013, we did not recognize service costs related to our pension plans for all periods presented. The benefits expense we recognized for our defined benefit plans was not material for all periods presented. In addition to the defined benefit plans we sponsor, we are also obligated to reimburse General Electric (“GE”) for future benefit payments to those participants who were vested in the supplemental pension plan sponsored by GE at the time of the joint venture transaction. These pension plans are currently unfunded and we recorded a benefit obligation of $314 million and $309 million as of December 31, 2016 and 2015 , respectively, which consists primarily of our obligations to reimburse GE. Our consolidated balance sheet also includes the assets and liabilities of certain legacy pension plans, as well as the assets and liabilities for pension plans of certain foreign subsidiaries. As of December 31, 2016 and 2015 , the benefit obligations associated with these plans exceeded the fair value of the plan assets by $62 million and $67 million , respectively. Other Employee Benefits Deferred Compensation Plans We maintain unfunded, nonqualified deferred compensation plans for certain members of management (each, a “participant”). The amount of compensation deferred by each participant is based on participant elections. Participants in the plan designate one or more valuation funds, independently established funds or indices that are used to determine the amount of investment gain or loss in the participant’s account. Additionally, certain members of management participate in Comcast’s unfunded, nonqualified deferred compensation plan. The amount of compensation deferred by each participant is based on participant elections. Participant accounts are credited with income primarily based on a fixed annual rate. In the case of both deferred compensation plans, participants are eligible to receive distributions from their account based on elected deferral periods that are consistent with the plans and applicable tax law. The table below presents the benefit obligation and interest expense for our deferred compensation plans. Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 494 $ 417 $ 349 Interest expense $ 48 $ 28 $ 24 Retirement Investment Plans We sponsor several 401(k) defined contribution retirement plans that allow eligible employees to contribute a portion of their compensation through payroll deductions in accordance with specified plan guidelines. We make contributions to the plans that include matching a percentage of the employees’ contributions up to certain limits. In 2016 , 2015 and 2014 , expenses related to these plans totaled $185 million , $174 million and $165 million , respectively. Multiemployer Benefit Plans We participate in various multiemployer benefit plans, including pension and postretirement benefit plans, that cover some of our employees and temporary employees who are represented by labor unions. We also participate in other multiemployer benefit plans that provide health and welfare and retirement savings benefits to active and retired participants. We make periodic contributions to these plans in accordance with the terms of applicable collective bargaining agreements and laws but do not sponsor or administer these plans. We do not participate in any multiemployer benefit plans for which we consider our contributions to be individually significant, and the largest plans in which we participate are funded at a level of 80% or greater. In 2016 , 2015 and 2014 , the total contributions we made to multiemployer pension plans were $84 million , $77 million and $58 million , respectively. In 2016 , 2015 and 2014 , the total contributions we made to multiemployer postretirement and other benefit plans were $136 million , $119 million and $125 million , respectively. If we cease to be obligated to make contributions or were to otherwise withdraw from participation in any of these plans, applicable law would require us to fund our allocable share of the unfunded vested benefits, which is known as a withdrawal liability. In addition, actions taken by other participating employers may lead to adverse changes in the financial condition of one of these plans, which could result in an increase in our withdrawal liability. Severance Benefits We provide severance benefits to certain former employees. A liability is recorded when payment is probable, the amount is reasonably estimable, and the obligation relates to rights that have vested or accumulated. In 2016 , 2015 and 2014 , we recorded severance costs of $165 million , $113 million and $113 million , respectively. Severance costs in 2016 included $61 million of severance costs associated with the acquisition of DreamWorks Animation.

Equity

Equity	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Equity	Note 12: Equity Common Stock In the aggregate, holders of our Class A common stock have 66 2 / 3 % of the voting power of our common stock and holders of our Class B common stock have 33 1 / 3 % of the voting power of our common stock. Each share of our Class B common stock is entitled to 15 votes. The number of votes held by each share of our Class A common stock depends on the number of shares of Class A and Class B common stock outstanding at any given time. The 33 1 / 3 % aggregate voting power of our Class B common stock cannot be diluted by additional issuances of any other class of common stock. Our Class B common stock is convertible, share for share, into Class A common stock, subject to certain restrictions. Class A Special Common Stock Reclassification In December 2015, our shareholders approved a proposal to amend and restate our Amended and Restated Certificate of Incorporation in order to reclassify each issued share of our Class A Special common stock into one share of our Class A common stock. This reclassification became effective as of the close of business on December 11, 2015, at which time our Class A Special common stock was no longer outstanding and ceased trading on the NASDAQ under the symbol CMCSK and instead became listed on the NASDAQ under the symbol CMCSA. There was no impact on basic and diluted EPS or the carrying value of total common stock as presented in our consolidated balance sheet because it was a one -for-one stock exchange. Shares of Common Stock Outstanding (in millions) A A Special B Balance, December 31, 2013 2,138 459 9 Stock compensation plans 13 — — Repurchases and retirements of common stock (22 ) (59 ) — Employee stock purchase plans 2 — — Balance, December 31, 2014 2,131 400 9 Stock compensation plans 12 — — Repurchases and retirements of common stock (62 ) (54 ) — Employee stock purchase plans 2 — — Reclassification of Class A Special common stock 346 (346 ) — Other 4 — — Balance, December 31, 2015 2,433 — 9 Stock compensation plans 11 — — Repurchases and retirements of common stock (81 ) — — Employee stock purchase plans 3 — — Balance, December 31, 2016 2,366 — 9 Share Repurchases Effective January 1, 2017, our Board of Directors increased our share repurchase program authorization to a total of $12 billion , which does not have an expiration date. Under the authorization, we may repurchase shares in the open market or in private transactions. Share Repurchases Year ended December 31 (in millions) 2016 2015 2014 Cash consideration $ 5,000 $ 6,750 $ 4,251 Shares repurchased 81 116 81 Accumulated Other Comprehensive Income (Loss) December 31 (in millions) 2016 2015 Unrealized gains (losses) on marketable securities $ — $ 1 Deferred gains (losses) on cash flow hedges (14 ) (46 ) Unrecognized gains (losses) on employee benefit obligations 219 6 Cumulative translation adjustments (107 ) (135 ) Accumulated other comprehensive income (loss), net of deferred taxes $ 98 $ (174 )

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation	Note 13: Share-Based Compensation The tables below provide condensed information on our share-based compensation. Recognized Share-Based Compensation Expense Year ended December 31 (in millions) 2016 2015 2014 Restricted share units $ 306 $ 273 $ 231 Stock options 173 157 160 Employee stock purchase plans 28 25 23 Total $ 507 $ 455 $ 414 As of December 31, 2016 , we had unrecognized pretax compensation expense of $712 million related to nonvested RSUs and unrecognized pretax compensation expense of $375 million related to nonvested stock options that will be recognized over a weighted-average period of approximately 1.7 years and 1.8 years, respectively. In 2016 , 2015 and 2014 , we recorded increases to additional paid-in capital of $233 million , $311 million and $299 million , respectively, which were the result of tax benefits associated with our share-based compensation plans. Stock Options and Restricted Share Units As of December 31, 2016, unless otherwise stated (in millions, except per share data) Stock Options RSUs Awards granted during 2016 21 8 Weighted-average exercise price of awards granted during 2016 $ 60.01 Stock options outstanding and nonvested RSUs 95 22 Weighted-average exercise price of stock options outstanding $ 42.60 Weighted-average fair value at grant date of nonvested RSUs $ 52.11 As of December 31, 2016 , substantially all of our stock options outstanding were net settled stock options. Net settled stock options, as opposed to stock options exercised with a cash payment, result in fewer shares being issued and no cash proceeds being received by us when the options are exercised. Our share-based compensation primarily consists of awards of RSUs and stock options to certain employees and directors as part of our approach to long-term incentive compensation. Awards generally vest over a period of 5 years and in the case of stock options, have a 10 year term. Additionally, through our employee stock purchase plans, employees are able to purchase shares of Comcast common stock at a discount through payroll deductions. The cost associated with our share-based compensation is based on an award’s estimated fair value at the date of grant and is recognized over the period in which any related services are provided. RSUs are valued based on the closing price of our common stock on the date of grant and are discounted for the lack of dividends, if any, during the vesting period. We use the Black-Scholes option pricing model to estimate the fair value of stock option awards. The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under our various plans and the related weighted-average valuation assumptions. Year ended December 31 2016 2015 2014 RSUs fair value $ 60.03 $ 58.81 $ 47.91 Stock options fair value $ 11.55 $ 11.78 $ 11.11 Stock Option Valuation Assumptions: Dividend yield 1.8 % 1.7 % 1.8 % Expected volatility 23.0 % 23.0 % 24.0 % Risk-free interest rate 1.5 % 1.6 % 2.2 % Expected option life (in years) 6.1 6.0 6.5
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation	Note 12: Share-Based Compensation The tables below provide condensed information on our share-based compensation. Recognized Share-Based Compensation Expense Year ended December 31 (in millions) 2016 2015 2014 Restricted share units $ 82 $ 78 $ 69 Stock options 9 10 16 Employee stock purchase plans 8 6 6 Total $ 99 $ 94 $ 91 As of December 31, 2016 , we had unrecognized pretax compensation expense of $204 million related to nonvested Comcast restricted share units (“RSUs”) and unrecognized pretax compensation expense of $28 million related to nonvested Comcast stock options that will be recognized over a weighted-average period of approximately 1.9 years and 1.8 years, respectively. Comcast maintains share-based compensation plans that primarily consist of awards of RSUs and stock options to certain employees and directors as part of its approach to long-term incentive compensation. Awards generally vest over a period of 5 years and in the case of stock options, have a 10 year term. 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. The cost associated with Comcast’s share-based compensation is based on an award’s estimated fair value at the date of grant and is recognized over the period in which any related services are provided. RSUs are valued based on the closing price of Comcast common stock on the date of grant and are discounted for the lack of dividends, if any, during the vesting period. Comcast uses the Black-Scholes option pricing model to estimate the fair value of stock option awards. The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under Comcast’s various plans to employees of NBCUniversal and the related weighted-average valuation assumptions. Year ended December 31 2016 2015 2014 RSUs fair value $ 59.58 $ 59.37 $ 48.04 Stock options fair value $ 13.17 $ 11.79 $ 11.09 Stock Option Valuation Assumptions: Dividend yield 1.7 % 1.7 % 1.8 % Expected volatility 23.2 % 23.0 % 24.0 % Risk-free interest rate 1.5 % 1.6 % 2.2 % Expected option life (in years) 7.5 6.0 6.5

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Taxes [Line Items]
Income Taxes	Note 14: Income Taxes Components of Income Tax Expense Year ended December 31 (in millions) 2016 2015 2014 Current Expense (Benefit): Federal $ 3,190 $ 3,210 $ 2,392 State 480 570 174 Foreign 194 221 142 3,864 4,001 2,708 Deferred Expense (Benefit): Federal 1,192 890 1,000 State 154 66 173 Foreign 98 2 (8 ) 1,444 958 1,165 Income tax expense $ 5,308 $ 4,959 $ 3,873 Our income tax expense differs from the federal statutory amount because of the effect of the items detailed in the table below. Year ended December 31 (in millions) 2016 2015 2014 Federal tax at statutory rate $ 5,024 $ 4,680 $ 4,363 State income taxes, net of federal benefit 373 326 329 Foreign income taxes, net of federal credit 65 13 — Nontaxable income attributable to noncontrolling interests (128 ) (69 ) (62 ) Adjustments to uncertain and effectively settled tax positions, net 24 15 (408 ) Accrued interest on uncertain and effectively settled tax positions, net 17 73 (235 ) Other (67 ) (79 ) (114 ) Income tax expense $ 5,308 $ 4,959 $ 3,873 We base our provision for income taxes on our current period income, changes in our deferred income tax assets and liabilities, income tax rates, changes in estimates of our uncertain tax positions, and tax planning opportunities available in the jurisdictions in which we operate. We recognize deferred tax assets and liabilities when there are temporary differences between the financial reporting basis and tax basis of our assets and liabilities and for the expected benefits of using net operating loss carryforwards. When a change in the tax rate or tax law has an impact on deferred taxes, we apply the change based on the years in which the temporary differences are expected to reverse. We record the change in our consolidated financial statements in the period of enactment. The determination of the income tax consequences of a business combination includes identifying the tax basis of assets and liabilities acquired and any contingencies associated with uncertain tax positions assumed or resulting from the business combination. Deferred tax assets and liabilities related to temporary differences of an acquired entity are recorded as of the date of the business combination and are based on our estimate of the ultimate tax basis that will be accepted by the various tax authorities. We record liabilities for contingencies associated with prior tax returns filed by the acquired entity based on criteria set forth in the appropriate accounting guidance. We adjust the deferred tax accounts and the liabilities periodically to reflect any revised estimated tax basis and any estimated settlements with the various tax authorities. The effects of these adjustments are recorded to income tax expense. From time to time, we engage in transactions in which the tax consequences may be subject to uncertainty. In these cases, we evaluate our tax position using the recognition threshold and the measurement attribute in accordance with the accounting guidance related to uncertain tax positions. Examples of these transactions include business acquisitions and dispositions, including consideration paid or received in connection with these transactions, certain financing transactions, and the allocation of income among state and local tax jurisdictions. Significant judgment is required in assessing and estimating the tax consequences of these transactions. We determine whether it is more likely than not that a tax position will be sustained on examination, including the resolution of any related appeals or litigation processes, based on the technical merits of the position. A tax position that meets the more-likely-than-not recognition threshold is measured to determine the amount of benefit to be recognized in our consolidated financial statements. We classify interest and penalties, if any, associated with our uncertain tax positions as a component of income tax expense. NBCUniversal For U.S. federal income tax purposes, NBCUniversal Holdings is treated as a partnership and NBCUniversal is disregarded as an entity separate from NBCUniversal Holdings. Accordingly, neither NBCUniversal Holdings nor NBCUniversal and its subsidiaries incur any material current or deferred domestic income taxes. We are indemnified by GE for any income tax liability attributable to the NBCUniversal contributed businesses for periods prior to the close of the NBCUniversal transaction in January 2011 and also for any income tax liability attributable to NBCUniversal Enterprise for periods prior to the date of the NBCUniversal redemption transaction in March 2013. We have indemnified GE for any income tax liability attributable to the businesses we contributed to NBCUniversal for periods prior to the close of the NBCUniversal transaction. Current and deferred foreign income taxes are incurred by NBCUniversal’s foreign subsidiaries. In 2016 , 2015 and 2014 , NBCUniversal had foreign income before taxes of $871 million , $704 million and $385 million , respectively, on which foreign income tax expense was recorded. We recorded U.S. income tax expense on our allocable share of our subsidiaries’ income before domestic and foreign taxes, which was reduced by a U.S. tax credit equal to our allocable share of our subsidiaries’ foreign income tax expense. Components of Net Deferred Tax Liability December 31 (in millions) 2016 2015 Deferred Tax Assets: Net operating loss carryforwards $ 544 $ 551 Differences between book and tax basis of investments — 101 Nondeductible accruals and other 3,789 3,704 Less: Valuation allowance 266 342 4,067 4,014 Deferred Tax Liabilities: Differences between book and tax basis of property and equipment and intangible assets 37,401 36,392 Differences between book and tax basis of investments 144 — Differences between book and tax basis of indexed debt securities 375 457 Differences between book and tax basis of foreign subsidiaries and undistributed foreign earnings 960 731 38,880 37,580 Net deferred tax liability $ 34,813 $ 33,566 Changes in our net deferred tax liability in 2016 that were not recorded as deferred income tax expense are primarily related to an increase of $158 million associated with items included in other comprehensive income (loss), a decrease of $226 million related to acquisitions and a decrease of $129 million associated with our purchase of a noncontrolling interest. Our net deferred tax liability includes $23 billion related to cable franchise rights that will remain unchanged unless we recognize an impairment or dispose of a cable franchise or there is a change in the tax law. As of December 31, 2016 , we had federal net operating loss carryforwards of $598 million , including losses of DreamWorks Animation, and various state net operating loss carryforwards that expire in periods through 2036. As of December 31, 2016 , we also had foreign net operating loss carryforwards of $431 million that are related to the foreign operations of NBCUniversal, the majority of which expire in periods through 2026. The determination of the realization of the state and foreign net operating loss carryforwards is dependent on our subsidiaries’ taxable income or loss, apportionment percentages, redetermination from taxing authorities, and state and foreign laws that can change from year to year and impact the amount of such carryforwards. We recognize a valuation allowance if we determine it is more likely than not that some portion, or all, of a deferred tax asset will not be realized. As of December 31, 2016 and 2015 , our valuation allowance was primarily related to state and foreign net operating loss carryforwards. Uncertain Tax Positions Our uncertain tax positions as of December 31, 2016 totaled $1.1 billion , which exclude the federal benefits on state tax positions that were recorded as deferred income taxes. Included in our uncertain tax positions was $181 million related to tax positions of NBCUniversal and NBCUniversal Enterprise for which we have been indemnified by GE. If we were to recognize the tax benefit for our uncertain tax positions in the future, $600 million would impact our effective tax rate and the remaining amount would increase our deferred income tax liability. The amount and timing of the recognition of any such tax benefit is dependent on the completion of examinations of our tax filings by the various tax authorities and the expiration of statutes of limitations. In 2014, we reduced our accruals for uncertain tax positions and the related accrued interest on these tax positions and, as a result, our income tax expense decreased by $759 million . It is reasonably possible that certain tax contests could be resolved within the next 12 months that may result in a decrease in our effective tax rate. Reconciliation of Unrecognized Tax Benefits (in millions) 2016 2015 2014 Balance, January 1 $ 1,136 $ 1,171 $ 1,701 Additions based on tax positions related to the current year 74 67 63 Additions based on tax positions related to prior years 67 98 111 Additions from acquired subsidiaries 13 — — Reductions for tax positions of prior years (62 ) (84 ) (220 ) Reductions due to expiration of statutes of limitations (44 ) (41 ) (448 ) Settlements with tax authorities (81 ) (75 ) (36 ) Balance, December 31 $ 1,103 $ 1,136 $ 1,171 As of December 31, 2016 and 2015 , our accrued interest associated with uncertain tax positions was $483 million and $510 million , respectively. As of December 31, 2016 and 2015 , $39 million and $49 million , respectively, of these amounts were related to tax positions of NBCUniversal and NBCUniversal Enterprise for which we have been indemnified by GE. During 2016 , the IRS completed its examination of our income tax returns for the year 2014. Various states are examining our tax returns, with most of the periods relating to tax years 2000 and forward. The tax years of our state tax returns currently under examination vary by state.
NBCUniversal Media LLC [Member]
Income Taxes [Line Items]
Income Taxes	Note 13: Income Taxes Components of Income Tax Expense Year ended December 31 (in millions) 2016 2015 2014 Foreign Current income tax expense $ 38 $ 81 $ 33 Deferred income tax expense 96 2 (8 ) Withholding tax expense 158 139 108 U.S. domestic tax expense 13 5 10 Income tax expense $ 305 $ 227 $ 143 We are a limited liability company, and our company is disregarded for U.S. federal income tax purposes as an entity separate from NBCUniversal Holdings, a tax partnership. We are not expected to incur any significant current or deferred U.S. domestic income taxes. Our tax liability is comprised primarily of withholding tax on foreign licensing activity and income taxes on foreign earnings. As a result of our tax status, the deferred tax assets and liabilities included in our consolidated balance sheet at December 31, 2016 and 2015 were not material. In jurisdictions in which we are subject to income taxes, we base our provision for income taxes on our current period income, changes in our deferred income tax assets and liabilities, income tax rates, changes in estimates of our uncertain tax positions, and tax planning opportunities available in the jurisdictions in which we operate. We recognize deferred tax assets and liabilities when there are temporary differences between the financial reporting basis and tax basis of our assets and liabilities and for the expected benefits of using net operating loss carryforwards. When a change in the tax rate or tax law has an impact on deferred taxes, we apply the change based on the years in which the temporary differences are expected to reverse. We record the change in our consolidated financial statements in the period of enactment. We classify interest and penalties, if any, associated with our uncertain tax positions as a component of income tax expense. Uncertain Tax Positions We retain liabilities for uncertain tax positions where we are the tax filer of record. GE and Comcast have indemnified NBCUniversal Holdings and us with respect to our income tax obligations attributable to periods prior to the close of the joint venture transaction, including indemnification of uncertain tax positions for these periods. The liabilities for uncertain tax positions included in our consolidated balance sheet were not material as of December 31, 2016 and 2015 . Various domestic and foreign tax authorities are examining our tax returns through tax year 2015. The majority of the periods under examination relate to tax years 2009 and forward.

Supplemental Financial Informat

Supplemental Financial Information	12 Months Ended
	Dec. 31, 2016
Supplemental Financial Information [Line Items]
Supplemental Financial Information	Note 15: Supplemental Financial Information Receivables December 31 (in millions) 2016 2015 Receivables, gross $ 8,622 $ 7,595 Less: Allowance for returns and customer incentives 417 473 Less: Allowance for doubtful accounts 250 226 Receivables, net $ 7,955 $ 6,896 In addition to the amounts in the table above, as of December 31, 2016 and 2015 , noncurrent receivables of $939 million and $721 million , respectively, are included in other noncurrent assets, net that primarily relate to the licensing of our television and film productions to third parties. Cash Payments for Interest and Income Taxes Year ended December 31 (in millions) 2016 2015 2014 Interest $ 2,565 $ 2,443 $ 2,389 Income taxes $ 3,693 $ 3,726 $ 3,668 Noncash Investing and Financing Activities During 2016 : • we acquired $1.3 billion of property and equipment and intangible assets that were accrued but unpaid • we recorded a liability of $653 million for a quarterly cash dividend of $0.275 per common share paid in January 2017 • we recorded a liability for capital contributions for an investment that were accrued in December and paid in January 2017 (see Note 7 for additional information) During 2015 : • we acquired $1.1 billion of property and equipment and intangible assets that were accrued but unpaid • we recorded a liability of $612 million for a quarterly cash dividend of $0.25 per common share paid in January 2016 • we assumed liabilities related to the Universal Studios Japan transaction (see Note 5 for additional information) • we used $517 million of equity securities to settle a portion of our obligations under prepaid forward sale agreements During 2014 : • we acquired $797 million of property and equipment and intangible assets that were accrued but unpaid • we recorded a liability of $572 million for a quarterly cash dividend of $0.225 per common share paid in January 2015 • we used $3.2 billion of equity securities to settle a portion of our obligations under prepaid forward sale agreements
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Supplemental Financial Information	Note 14: Supplemental Financial Information Receivables December 31 (in millions) 2016 2015 Receivables, gross $ 6,799 $ 5,949 Less: Allowance for returns and customer incentives 413 469 Less: Allowance for doubtful accounts 84 69 Receivables, net $ 6,302 $ 5,411 In addition to the amounts in the table above, as of December 31, 2016 and 2015 , noncurrent receivables of $939 million and $721 million , respectively, are included in other noncurrent assets, net that primarily relate to the licensing of our television and film productions to third parties. Accumulated Other Comprehensive Income (Loss) December 31 (in millions) 2016 2015 Deferred gains (losses) on cash flow hedges $ 23 $ (1 ) Unrecognized gains (losses) on employee benefit obligations 14 (1 ) Cumulative translation adjustments (172 ) (210 ) Accumulated other comprehensive income (loss) $ (135 ) $ (212 ) Cash Payments for Interest and Income Taxes Year ended December 31 (in millions) 2016 2015 2014 Interest $ 548 $ 456 $ 485 Income taxes $ 208 $ 182 $ 174 Noncash Investing and Financing Activities During 2016 : • we acquired $189 million of property and equipment and intangible assets that were accrued but unpaid • Comcast contributed the net assets of DreamWorks Animation to us, which was primarily a noncash transaction (see Note 4 for additional information) During 2015 : • we acquired $287 million of property and equipment and intangible assets that were accrued but unpaid • Comcast contributed the net assets of $252 million related to an acquired business, which was a noncash transaction • we assumed liabilities related to the Universal Studios Japan transaction (see Note 4 for additional information) During 2014 : • we acquired $148 million of property and equipment and intangible assets that were accrued but unpaid

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitment And Contingencies [Line Items]
Commitments and Contingencies	Note 16: Commitments and Contingencies Commitments NBCUniversal enters into long-term commitments with third parties in the ordinary course of its business, including commitments to acquire film and television programming, obligations under various creative talent agreements, and various other television-related commitments. Many of NBCUniversal’s employees, including writers, directors, actors, technical and production personnel, and others, as well as some of its on-air and creative talent, are covered by collective bargaining agreements or works councils. As of December 31, 2016 , the total number of NBCUniversal full-time, part-time and hourly employees on its payroll covered by collective bargaining agreements was 8,500 full-time equivalent employees. Approximately 15% of these full-time equivalent employees were covered by collective bargaining agreements that have expired or are scheduled to expire during 2017. We, through Comcast Spectacor, have employment agreements with both players and coaches of the Philadelphia Flyers. Certain of these employment agreements, which provide for payments that are guaranteed regardless of employee injury or termination, are covered by disability insurance if certain conditions are met. The table below summarizes our minimum annual programming and talent commitments and our minimum annual rental commitments for office space, equipment and transponder service agreements under operating leases. Programming and talent commitments include acquired film and television programming, including U.S. broadcast rights to the Olympic Games through 2032, Sunday Night Football through the 2022-23 season , Thursday Night Football through the 2017-18 season , certain NASCAR events through 2024 and other programming commitments, as well as various contracts with creative talent. As of December 31, 2016 (in millions) Programming and Talent Commitments Operating Leases 2017 $ 5,222 $ 517 2018 $ 4,879 $ 485 2019 $ 3,503 $ 433 2020 $ 4,587 $ 378 2021 $ 3,177 $ 321 Thereafter $ 20,847 $ 1,873 The table below presents our rental expense charged to operations. Year ended December 31 (in millions) 2016 2015 2014 Rental expense $ 744 $ 608 $ 580 Contractual Obligation We are party to a contractual obligation that involves an interest held by a third party in the revenue of certain theme parks. The arrangement provides the counterparty with the right to periodic payments associated with current period revenue and, beginning in June 2017, the option to require NBCUniversal to purchase the interest for cash in an amount based on a contractual formula. The contractual formula is based on an average of specified historical theme park revenue at the time of exercise, which amount could be significantly higher than our carrying value. As of December 31, 2016 , our carrying value was $1.1 billion , and if the option had been exercisable as of December 31, 2016 , the estimated value of the contractual obligation would have been approximately $1.4 billion , based on inputs to the contractual formula as of that date. Contingent Consideration In June 2015, we settled a contingent consideration liability related to the acquisition of NBCUniversal, which was based upon future net tax benefits realized by us that would affect future payments to GE, for a payment of $450 million , which is included as a financing activity in our consolidated statement of cash flows. The settlement resulted in a gain of $240 million , which was recorded to other income (expense), net in our consolidated statement of income. Redeemable Subsidiary Preferred Stock NBCUniversal Enterprise is a holding company that we control and consolidate whose principal assets are its interests in NBCUniversal Holdings. The NBCUniversal Enterprise preferred stock pays dividends at a fixed rate of 5.25% per annum. The holders have the right to cause NBCUniversal Enterprise to redeem their shares at a price equal to the liquidation preference plus accrued but unpaid dividends for a 30 day period beginning on March 19, 2020 and thereafter on every third anniversary of such date (each such date, a “put date”). Shares of preferred stock can be called for redemption by NBCUniversal Enterprise at a price equal to the liquidation preference plus accrued but unpaid dividends one year following the put date applicable to such shares. Because certain of these redemption provisions are outside of our control, the NBCUniversal Enterprise preferred stock is presented outside of equity under the caption “redeemable noncontrolling interests and redeemable subsidiary preferred stock” in our consolidated balance sheet. Its initial value was based on the liquidation preference of the preferred stock and is adjusted for accrued but unpaid dividends. As of December 31, 2016 and 2015, the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $741 million and $758 million , respectively. 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. Contingencies We are a defendant in several unrelated lawsuits claiming infringement of various patents relating to various aspects of our businesses. In certain of these cases other industry participants are also defendants, and also in certain of these cases we expect that any potential liability would be in part or in whole the responsibility of our equipment and technology vendors under applicable contractual indemnification provisions. We are also subject to other legal proceedings and claims that arise in the ordinary course of our business. While the amount of ultimate liability with respect to such actions is not expected to materially affect our 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.
NBCUniversal Media LLC [Member]
Commitment And Contingencies [Line Items]
Commitments and Contingencies	Note 15: Commitments and Contingencies Commitments We enter into long-term commitments with third parties in the ordinary course of our business, including commitments to acquire film and television programming, obligations under various creative talent agreements, and various other television-related commitments. Many of our employees, including writers, directors, actors, technical and production personnel, and others, as well as some of our on-air and creative talent, are covered by collective bargaining agreements or works councils. As of December 31, 2016 , the total number of full-time, part-time and hourly employees on our payroll covered by collective bargaining agreements was 8,500 full-time equivalent employees. Approximately 15% of these full-time equivalent employees were covered by collective bargaining agreements that have expired or are scheduled to expire during 2017. The table below summarizes our minimum annual programming and talent commitments and our minimum annual rental commitments for office space and equipment under operating leases. Programming and talent commitments include acquired film and television programming, including U.S. broadcast rights to the Olympic Games through 2032, Sunday Night Football through the 2022-23 season , Thursday Night Football through the 2017-18 season , certain NASCAR events through 2024 and other programming commitments, as well as various contracts with creative talent. As of December 31, 2016 (in millions) Programming and Talent Commitments Operating Leases 2017 $ 5,213 $ 198 2018 $ 4,876 $ 182 2019 $ 3,503 $ 173 2020 $ 4,587 $ 163 2021 $ 3,177 $ 147 Thereafter $ 20,847 $ 1,238 The table below presents our rental expense charged to operations. Year ended December 31 (in millions) 2016 2015 2014 Rental expense $ 259 $ 213 $ 222 Contractual Obligation We are party to a contractual obligation that involves an interest held by a third party in the revenue of certain theme parks. The arrangement provides the counterparty with the right to periodic payments associated with current period revenue and, beginning in June 2017, the option to require NBCUniversal to purchase the interest for cash in an amount based on a contractual formula. The contractual formula is based on an average of specified historical theme park revenue at the time of exercise, which amount could be significantly higher than our carrying value. As of December 31, 2016 , our carrying value was $1.1 billion , and if the option had been exercisable as of December 31, 2016 , the estimated value of the contractual obligation would have been approximately $1.4 billion , based on inputs to the contractual formula as of that date.

Financial Data by Business Segm

Financial Data by Business Segment	12 Months Ended
	Dec. 31, 2016
Segment Reporting Information [Line Items]
Financial Data by Business Segment	Note 17: Financial Data by Business Segment We present our operations in one reportable business segment for Cable Communications and four reportable business segments for NBCUniversal. The Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks segments comprise the NBCUniversal businesses and are collectively referred to as the NBCUniversal segments. Our financial data by reportable business segment is presented in the tables below. We do not present a measure of total assets for our reportable business segments as this information is not used by management to allocate resources and capital. (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2016 Cable Communications (a)(b) $ 50,048 $ 20,109 $ 7,670 $ 12,439 $ 7,596 $ 1,377 NBCUniversal Cable Networks (c) 10,464 3,709 745 2,964 32 20 Broadcast Television (c) 10,147 1,320 125 1,195 153 19 Filmed Entertainment 6,360 697 47 650 33 16 Theme Parks 4,946 2,190 512 1,678 922 72 Headquarters and Other (d) 20 (699 ) 376 (1,075 ) 312 156 Eliminations (e) (344 ) 10 — 10 — — NBCUniversal 31,593 7,227 1,805 5,422 1,452 283 Corporate and Other (b) 750 (874 ) 83 (957 ) 87 26 Eliminations (e) (1,988 ) (45 ) — (45 ) — — Comcast Consolidated $ 80,403 $ 26,417 $ 9,558 $ 16,859 $ 9,135 $ 1,686 (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2015 Cable Communications (a)(b) $ 46,928 $ 19,037 $ 7,051 $ 11,986 $ 7,040 $ 1,151 NBCUniversal Cable Networks 9,628 3,499 784 2,715 44 22 Broadcast Television (c) 8,530 780 111 669 117 17 Filmed Entertainment 7,287 1,234 26 1,208 14 20 Theme Parks 3,339 1,464 292 1,172 833 54 Headquarters and Other (d) 14 (625 ) 326 (951 ) 378 98 Eliminations (e) (336 ) — — — — — NBCUniversal 28,462 6,352 1,539 4,813 1,386 211 Corporate and Other (b) 713 (815 ) 90 (905 ) 73 8 Eliminations (e) (1,593 ) 104 — 104 — — Comcast Consolidated $ 74,510 $ 24,678 $ 8,680 $ 15,998 $ 8,499 $ 1,370 (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2014 Cable Communications (a)(b) $ 44,165 $ 18,097 $ 6,436 $ 11,661 $ 6,156 $ 979 NBCUniversal Cable Networks (c) 9,563 3,589 748 2,841 49 21 Broadcast Television (c) 8,542 734 127 607 76 12 Filmed Entertainment 5,008 711 21 690 11 7 Theme Parks 2,623 1,096 273 823 671 15 Headquarters and Other (d) 13 (613 ) 326 (939 ) 414 75 Eliminations (e) (321 ) (1 ) — (1 ) — — NBCUniversal 25,428 5,516 1,495 4,021 1,221 130 Corporate and Other (b) 683 (763 ) 88 (851 ) 43 13 Eliminations (e) (1,501 ) 73 — 73 — — Comcast Consolidated $ 68,775 $ 22,923 $ 8,019 $ 14,904 $ 7,420 $ 1,122 (a) For the years ended December 31, 2016 , 2015 and 2014 , Cable Communications segment revenue was derived from the following sources: 2016 2015 2014 Residential: Video 44.7 % 45.9 % 47.1 % High-speed Internet 27.0 % 26.6 % 25.6 % Voice 7.1 % 7.7 % 8.3 % Business services 11.0 % 10.1 % 9.0 % Advertising 5.0 % 4.9 % 5.4 % Other 5.2 % 4.8 % 4.6 % Total 100 % 100 % 100 % Subscription revenue received from customers who purchase bundled services at a discounted rate is allocated proportionally to each service based on the individual service’s price on a stand-alone basis. For each of 2016 , 2015 and 2014 , 2.8% of Cable Communications revenue was derived from franchise and other regulatory fees. (b) Beginning in 2016, certain operations and businesses, including several strategic business initiatives, that were previously presented in Corporate and Other are now presented in our Cable Communications segment to reflect a change in our management reporting presentation. For segment reporting purposes, we have adjusted all periods presented to reflect this change. (c) The revenue and operating costs and expenses associated with our broadcast of the 2016 Rio Olympics and 2014 Sochi Olympics were reported in our Cable Networks and Broadcast Television segments. The revenue and operating costs and expenses associated with our broadcast of the 2015 Super Bowl were reported in our Broadcast Television segment. (d) NBCUniversal Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives. (e) 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 by licensing content to our Cable Networks segment (f) Revenue from customers located outside of the United States, primarily in Europe and Asia, in 2016 , 2015 and 2014 was $6.5 billion , $5.8 billion and $4.4 billion , respectively. No single customer accounted for a significant amount of revenue in any period. (g) We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses from the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash depreciation and amortization expense that results from the capital-intensive nature of certain of our businesses and from intangible assets recognized in business combinations. Additionally, it is unaffected by our capital structure or 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) attributable to Comcast Corporation, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Financial Data by Business Segment	Note 16: Financial Data by Business Segment We present our operations in four reportable business segments: Cable Networks, Broadcast Television, Filmed Entertainment and Theme Parks. Our financial data by reportable business segment is presented in the tables below. We do not present a measure of total assets for our reportable business segments as this information is not used by management to allocate resources and capital. (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2016 Cable Networks (a) $ 10,464 $ 3,709 $ 745 $ 2,964 $ 32 $ 20 Broadcast Television (a) 10,147 1,320 125 1,195 153 19 Filmed Entertainment 6,360 697 47 650 33 16 Theme Parks 4,946 2,190 512 1,678 922 72 Headquarters and Other (b) 20 (699 ) 376 (1,075 ) 312 156 Eliminations (c) (344 ) 10 — 10 — — Total $ 31,593 $ 7,227 $ 1,805 $ 5,422 $ 1,452 $ 283 (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2015 Cable Networks $ 9,628 $ 3,499 $ 784 $ 2,715 $ 44 $ 22 Broadcast Television (a) 8,530 780 111 669 117 17 Filmed Entertainment 7,287 1,234 26 1,208 14 20 Theme Parks 3,339 1,464 292 1,172 833 54 Headquarters and Other (b) 14 (625 ) 326 (951 ) 378 98 Eliminations (c) (336 ) 6 — 6 — — Total $ 28,462 $ 6,358 $ 1,539 $ 4,819 $ 1,386 $ 211 (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2014 Cable Networks (a) $ 9,563 $ 3,589 $ 748 $ 2,841 $ 49 $ 21 Broadcast Television (a) 8,542 734 127 607 76 12 Filmed Entertainment 5,008 711 21 690 11 7 Theme Parks 2,623 1,096 273 823 671 15 Headquarters and Other (b) 13 (613 ) 326 (939 ) 414 75 Eliminations (c) (321 ) 71 — 71 — — Total $ 25,428 $ 5,588 $ 1,495 $ 4,093 $ 1,221 $ 130 (a) The revenue and operating costs and expenses associated with our broadcast of the 2016 Rio Olympics and 2014 Sochi Olympics were reported in our Cable Networks and Broadcast Television segments. The revenue and operating costs and expenses associated with our broadcast of the 2015 Super Bowl were reported in our Broadcast Television segment. (b) Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives. (c) Eliminations are transactions that our segments enter into with one another, which consisted primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment. (d) We operate primarily in the United States, but also in select international markets primarily in Europe and Asia. The table below summarizes revenue by geographic location. No single customer accounted for a significant amount of revenue in any period. Year ended December 31 (in millions) 2016 2015 2014 Revenue: United States $ 25,076 $ 22,663 $ 20,995 Foreign $ 6,517 $ 5,799 $ 4,433 (e) We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses from the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash amortization expense that results from intangible assets recognized in connection with the joint venture transaction and other business combinations. Additionally, it is unaffected by our capital structure or 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) attributable to NBCUniversal, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Quarterly Financial Information (Unaudited)	Note 18: Quarterly Financial Information (Unaudited) (in millions, except per share data) First Second Third Fourth Total 2016 Revenue $ 18,790 $ 19,269 $ 21,319 $ 21,025 $ 80,403 Operating income $ 4,089 $ 4,066 $ 4,440 $ 4,264 $ 16,859 Net income attributable to Comcast Corporation (a) $ 2,134 $ 2,028 $ 2,237 $ 2,296 $ 8,695 Basic earnings per common share attributable to Comcast Corporation shareholders $ 0.88 $ 0.84 $ 0.93 $ 0.96 $ 3.61 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 0.87 $ 0.83 $ 0.92 $ 0.95 $ 3.57 Dividends declared per common share $ 0.275 $ 0.275 $ 0.275 $ 0.275 $ 1.10 2015 Revenue $ 17,853 $ 18,743 $ 18,669 $ 19,245 $ 74,510 Operating income $ 3,890 $ 4,105 $ 4,001 $ 4,002 $ 15,998 Net income attributable to Comcast Corporation $ 2,059 $ 2,137 $ 1,996 $ 1,971 $ 8,163 Basic earnings per common share attributable to Comcast Corporation shareholders $ 0.82 $ 0.85 $ 0.81 $ 0.80 $ 3.28 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 0.81 $ 0.84 $ 0.80 $ 0.79 $ 3.24 Dividends declared per common share $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 1.00 (a) In the fourth quarter of 2016, net income attributable to Comcast Corporation included $225 million , $143 million net of tax, recognized in connection with the settlement of amounts owed to us under an agency agreement that had provided for, among other things, Verizon Wireless’ sale of our cable services .

Condensed Consolidating Financi

Condensed Consolidating Financial Information	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Information	Note 19: 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. The principal amount of debt securities within the guarantee structure total $52.9 billion , of which $12.3 billion will mature within the next five years . Comcast Parent and CCCL Parent also fully and unconditionally guarantee NBCUniversal Enterprise’s $3.3 billion principal amount of senior notes, revolving credit facility and commercial paper program. NBCUniversal Media Parent does not guarantee the NBCUniversal Enterprise senior notes, revolving credit facility or commercial paper program. Comcast Parent provides an unconditional subordinated guarantee of the $185 million principal amount currently outstanding of Comcast Holdings’ ZONES due October 2029 . Neither CCCL Parent nor NBCUniversal Media Parent guarantee the Comcast Holdings’ ZONES due October 2029. None of Comcast Parent, CCCL Parent nor NBCUniversal Media Parent guarantee the $62 million principal amount currently outstanding of Comcast Holdings’ ZONES due November 2029 or the $3.3 billion of Universal Studios Japan term loans. Condensed Consolidating Balance Sheet December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Assets Cash and cash equivalents $ — $ — $ — $ 482 $ 2,819 $ — $ 3,301 Receivables, net — — — — 7,955 — 7,955 Programming rights — — — — 1,250 — 1,250 Deposits — — — — 1,772 — 1,772 Other current assets 151 — — 36 1,896 — 2,083 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 28 — — — — — 28 Other shareholders’ equity 53,915 120,026 114,705 38,901 207,582 (481,214 ) 53,915 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 Balance Sheet December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Assets Cash and cash equivalents $ — $ — $ — $ 414 $ 1,881 $ — $ 2,295 Receivables, net — — — — 6,896 — 6,896 Programming rights — — — — 1,213 — 1,213 Deposits — — — — 21 — 21 Other current assets 69 — — 17 1,792 — 1,878 Total current assets 69 — — 431 11,803 — 12,303 Film and television costs — — — — 5,855 — 5,855 Investments 33 — — 430 2,761 — 3,224 Investments in and amounts due from subsidiaries eliminated upon consolidation 87,142 111,241 119,354 42,441 109,598 (469,776 ) — Property and equipment, net 210 — — — 33,455 — 33,665 Franchise rights — — — — 59,364 — 59,364 Goodwill — — — — 32,945 — 32,945 Other intangible assets, net 12 — — — 16,934 — 16,946 Other noncurrent assets, net 1,301 147 — 78 2,114 (1,368 ) 2,272 Total assets $ 88,767 $ 111,388 $ 119,354 $ 43,380 $ 274,829 $ (471,144 ) $ 166,574 Liabilities and Equity Accounts payable and accrued expenses related to trade creditors $ 16 $ — $ — $ — $ 6,199 $ — $ 6,215 Accrued participations and residuals — — — — 1,572 — 1,572 Accrued expenses and other current liabilities 1,789 335 290 389 3,961 — 6,764 Current portion of long-term debt 1,149 — — 1,005 1,473 — 3,627 Total current liabilities 2,954 335 290 1,394 13,205 — 18,178 Long-term debt, less current portion 31,106 130 2,650 8,211 6,897 — 48,994 Deferred income taxes — 624 — 66 34,098 (1,222 ) 33,566 Other noncurrent liabilities 2,438 — — 1,087 7,258 (146 ) 10,637 Redeemable noncontrolling interests and redeemable subsidiary preferred stock — — — — 1,221 — 1,221 Equity: Common stock 29 — — — — — 29 Other shareholders’ equity 52,240 110,299 116,414 32,622 210,441 (469,776 ) 52,240 Total Comcast Corporation shareholders’ equity 52,269 110,299 116,414 32,622 210,441 (469,776 ) 52,269 Noncontrolling interests — — — — 1,709 — 1,709 Total equity 52,269 110,299 116,414 32,622 212,150 (469,776 ) 53,978 Total liabilities and equity $ 88,767 $ 111,388 $ 119,354 $ 43,380 $ 274,829 $ (471,144 ) $ 166,574 Condensed Consolidating Statement of Income For the Year Ended December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 80,403 $ — $ 80,403 Management fee revenue 1,067 — 1,049 — — (2,116 ) — 1,067 — 1,049 — 80,403 (2,116 ) 80,403 Costs and Expenses: Programming and production — — — — 24,463 — 24,463 Other operating and administrative 813 — 1,049 932 22,731 (2,116 ) 23,409 Advertising, marketing and promotion — — — — 6,114 — 6,114 Depreciation 28 — — — 7,436 — 7,464 Amortization 6 — — — 2,088 — 2,094 847 — 1,049 932 62,832 (2,116 ) 63,544 Operating income (loss) 220 — — (932 ) 17,571 — 16,859 Other Income (Expense): Interest expense (1,941 ) (12 ) (239 ) (456 ) (294 ) — (2,942 ) Investment income (loss), net 7 (5 ) — (25 ) 236 — 213 Equity in net income (losses) of investees, net 9,809 9,286 8,679 5,545 4,131 (37,554 ) (104 ) Other income (expense), net — — — 116 211 — 327 7,875 9,269 8,440 5,180 4,284 (37,554 ) (2,506 ) Income (loss) before income taxes 8,095 9,269 8,440 4,248 21,855 (37,554 ) 14,353 Income tax (expense) benefit 600 6 84 (13 ) (5,985 ) — (5,308 ) Net income (loss) 8,695 9,275 8,524 4,235 15,870 (37,554 ) 9,045 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (350 ) — (350 ) Net income (loss) attributable to Comcast Corporation $ 8,695 $ 9,275 $ 8,524 $ 4,235 $ 15,520 $ (37,554 ) $ 8,695 Comprehensive income (loss) attributable to Comcast Corporation $ 8,967 $ 9,317 $ 8,530 $ 4,312 $ 15,610 $ (37,769 ) $ 8,967 Condensed Consolidating Statement of Income For the Year Ended December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 74,510 $ — $ 74,510 Management fee revenue 1,005 — 977 — — (1,982 ) — 1,005 — 977 — 74,510 (1,982 ) 74,510 Costs and Expenses: Programming and production — — — — 22,550 — 22,550 Other operating and administrative 760 — 977 922 20,642 (1,982 ) 21,319 Advertising, marketing and promotion — — — — 5,963 — 5,963 Depreciation 31 — — — 6,750 — 6,781 Amortization 6 — — — 1,893 — 1,899 797 — 977 922 57,798 (1,982 ) 58,512 Operating income (loss) 208 — — (922 ) 16,712 — 15,998 Other Income (Expense): Interest expense (1,744 ) (12 ) (270 ) (462 ) (214 ) — (2,702 ) Investment income (loss), net 6 (1 ) — (19 ) 95 — 81 Equity in net income (losses) of investees, net 9,159 8,651 8,040 4,852 3,089 (34,116 ) (325 ) Other income (expense), net (3 ) — — (31 ) 354 — 320 7,418 8,638 7,770 4,340 3,324 (34,116 ) (2,626 ) Income (loss) before income taxes 7,626 8,638 7,770 3,418 20,036 (34,116 ) 13,372 Income tax (expense) benefit 537 4 94 (4 ) (5,590 ) — (4,959 ) Net income (loss) 8,163 8,642 7,864 3,414 14,446 (34,116 ) 8,413 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (250 ) — (250 ) Net income (loss) attributable to Comcast Corporation $ 8,163 $ 8,642 $ 7,864 $ 3,414 $ 14,196 $ (34,116 ) $ 8,163 Comprehensive income (loss) attributable to Comcast Corporation $ 8,135 $ 8,625 $ 7,864 $ 3,361 $ 14,192 $ (34,042 ) $ 8,135 Condensed Consolidating Statement of Income For the Year Ended December 31, 2014 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 68,775 $ — $ 68,775 Management fee revenue 947 — 921 — — (1,868 ) — 947 — 921 — 68,775 (1,868 ) 68,775 Costs and Expenses: Programming and production — — — — 20,912 — 20,912 Other operating and administrative 751 — 921 908 19,127 (1,868 ) 19,839 Advertising, marketing and promotion — — — — 5,101 — 5,101 Depreciation 34 — — — 6,303 — 6,337 Amortization 6 — — — 1,676 — 1,682 791 — 921 908 53,119 (1,868 ) 53,871 Operating income (loss) 156 — — (908 ) 15,656 — 14,904 Other Income (Expense): Interest expense (1,621 ) (11 ) (294 ) (479 ) (212 ) — (2,617 ) Investment income (loss), net 3 12 — (7 ) 288 — 296 Equity in net income (losses) of investees, net 9,330 8,843 8,350 4,523 3,212 (34,161 ) 97 Other income (expense), net — — — (4 ) (211 ) — (215 ) 7,712 8,844 8,056 4,033 3,077 (34,161 ) (2,439 ) Income (loss) before income taxes 7,868 8,844 8,056 3,125 18,733 (34,161 ) 12,465 Income tax (expense) benefit 512 — 103 (10 ) (4,478 ) — (3,873 ) Net income (loss) 8,380 8,844 8,159 3,115 14,255 (34,161 ) 8,592 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (212 ) — (212 ) Net income (loss) attributable to Comcast Corporation $ 8,380 $ 8,844 $ 8,159 $ 3,115 $ 14,043 $ (34,161 ) $ 8,380 Comprehensive income (loss) attributable to Comcast Corporation $ 8,178 $ 8,807 $ 8,163 $ 2,972 $ 13,980 $ (33,922 ) $ 8,178 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (1,332 ) $ (189 ) $ (100 ) $ (1,453 ) $ 22,314 $ — $ 19,240 Investing Activities: Net transactions with affiliates (860 ) 189 100 2,642 (2,071 ) — — Capital expenditures (13 ) — — — (9,122 ) — (9,135 ) Cash paid for intangible assets (9 ) — — — (1,677 ) — (1,686 ) Acquisitions and construction of real estate properties (35 ) — — — (393 ) — (428 ) Acquisitions, net of cash acquired — — — — (3,929 ) — (3,929 ) Proceeds from sales of businesses and investments — — — 104 114 — 218 Purchases of investments (40 ) — — (210 ) (1,447 ) — (1,697 ) Deposits — — — — (1,749 ) — (1,749 ) Other (108 ) — — (35 ) 164 — 21 Net cash provided by (used in) investing activities (1,065 ) 189 100 2,501 (20,110 ) — (18,385 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net 1,339 — — — 451 — 1,790 Proceeds from borrowings 9,231 — — — — — 9,231 Repurchases and repayments of debt (750 ) — — (1,005 ) (1,297 ) — (3,052 ) Repurchases and retirements of common stock (5,000 ) — — — — — (5,000 ) Dividends paid (2,601 ) — — — — — (2,601 ) Issuances of common stock 23 — — — — — 23 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (253 ) — (253 ) Other 155 — — 25 (167 ) — 13 Net cash provided by (used in) financing activities 2,397 — — (980 ) (1,266 ) — 151 Increase (decrease) in cash and cash equivalents — — — 68 938 — 1,006 Cash and cash equivalents, beginning of year — — — 414 1,881 — 2,295 Cash and cash equivalents, end of year $ — $ — $ — $ 482 $ 2,819 $ — $ 3,301 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (792 ) $ 48 $ (167 ) $ (1,398 ) $ 21,087 $ — $ 18,778 Investing Activities: Net transactions with affiliates 6,559 (48 ) 840 2,839 (10,190 ) — — Capital expenditures (27 ) — — — (8,472 ) — (8,499 ) Cash paid for intangible assets (6 ) — — — (1,364 ) — (1,370 ) Acquisitions and construction of real estate properties — — — — (178 ) — (178 ) Acquisitions, net of cash acquired — — — — (1,786 ) — (1,786 ) Proceeds from sales of businesses and investments — — — 4 429 — 433 Purchases of investments (7 ) — — (407 ) (370 ) — (784 ) Deposits — — — — (18 ) — (18 ) Other 7 — — (5 ) 236 — 238 Net cash provided by (used in) investing activities 6,526 (48 ) 840 2,431 (21,713 ) — (11,964 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net 400 — — — (265 ) — 135 Proceeds from borrowings 5,486 — — — — — 5,486 Repurchases and repayments of debt (2,650 ) — (673 ) (1,004 ) (51 ) — (4,378 ) Repurchases and retirements of common stock (6,750 ) — — — — — (6,750 ) Dividends paid (2,437 ) — — — — — (2,437 ) Issuances of common stock 36 — — — — — 36 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (232 ) — (232 ) Other 181 — — — (470 ) — (289 ) Net cash provided by (used in) financing activities (5,734 ) — (673 ) (1,004 ) (1,018 ) — (8,429 ) Increase (decrease) in cash and cash equivalents — — — 29 (1,644 ) — (1,615 ) Cash and cash equivalents, beginning of year — — — 385 3,525 — 3,910 Cash and cash equivalents, end of year $ — $ — $ — $ 414 $ 1,881 $ — $ 2,295 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2014 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (354 ) $ 9 $ (139 ) $ (1,299 ) $ 18,728 $ — $ 16,945 Investing Activities: Net transactions with affiliates 4,784 (9 ) 139 2,247 (7,161 ) — — Capital expenditures (3 ) — — — (7,417 ) — (7,420 ) Cash paid for intangible assets (6 ) — — — (1,116 ) — (1,122 ) Acquisitions and construction of real estate properties — — — — (43 ) — (43 ) Acquisitions, net of cash acquired — — — — (477 ) — (477 ) Proceeds from sales of businesses and investments — — — 8 658 — 666 Purchases of investments (19 ) — — (10 ) (162 ) — (191 ) Deposits — — — — — — — Other — — — 5 (151 ) — (146 ) Net cash provided by (used in) investing activities 4,756 (9 ) 139 2,250 (15,869 ) — (8,733 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net (1,350 ) — — — 846 — (504 ) Proceeds from borrowings 4,180 — — — 2 — 4,182 Repurchases and repayments of debt (1,000 ) — — (902 ) (1,273 ) — (3,175 ) Repurchases and retirements of common stock (4,251 ) — — — — — (4,251 ) Dividends paid (2,254 ) — — — — — (2,254 ) Issuances of common stock 35 — — — — — 35 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (220 ) — (220 ) Other 238 — — — (71 ) — 167 Net cash provided by (used in) financing activities (4,402 ) — — (902 ) (716 ) — (6,020 ) Increase (decrease) in cash and cash equivalents — — — 49 2,143 — 2,192 Cash and cash equivalents, beginning of year — — — 336 1,382 — 1,718 Cash and cash equivalents, end of year $ — $ — $ — $ 385 $ 3,525 $ — $ 3,910

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule II - Valuation and Qualifying Accounts	Comcast Corporation and Subsidiaries Schedule II – Valuation and Qualifying Accounts Year ended December 31, 2016 , 2015 and 2014 Year Ended December 31 (in millions) Balance at Beginning Additions Charged to Deductions from Balance at End 2016 Allowance for doubtful accounts $ 226 $ 86 $ 62 $ 250 Allowance for returns and customer incentives 473 1,041 1,097 417 Valuation allowance on deferred tax assets 342 23 99 266 2015 Allowance for doubtful accounts $ 205 $ 166 $ 145 $ 226 Allowance for returns and customer incentives 359 1,236 1,122 473 Valuation allowance on deferred tax assets 375 4 37 342 2014 Allowance for doubtful accounts $ 221 $ 162 $ 178 $ 205 Allowance for returns and customer incentives 375 932 948 359 Valuation allowance on deferred tax assets 405 33 63 375
NBCUniversal Media LLC [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule II - Valuation and Qualifying Accounts	NBCUniversal Media, LLC Schedule II– Valuation and Qualifying Accounts Year ended December 31, 2016 , 2015 and 2014 Year Ended December 31 (in millions) Balance at Beginning Additions Charged to Deductions from Balance at End 2016 Allowance for doubtful accounts $ 69 $ 26 $ 11 $ 84 Allowance for returns and customer incentives 469 1,040 1,096 413 Valuation allowance on deferred tax assets 71 23 22 72 2015 Allowance for doubtful accounts $ 60 $ 27 $ 18 $ 69 Allowance for returns and customer incentives 356 1,233 1,120 469 Valuation allowance on deferred tax assets 87 4 20 71 2014 Allowance for doubtful accounts $ 65 $ 11 $ 16 $ 60 Allowance for returns and customer incentives 372 930 946 356 Valuation allowance on deferred tax assets 60 33 6 87 (a) Additions and deductions related to allowance for returns and customer incentives include amounts for distribution on behalf of third parties.

Accounting Policies (Policies)

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Line Items]
Impairment Testing of Investments	Impairment Testing of Investments We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our AFS securities and our cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net.
Goodwill	Goodwill is calculated as the excess of the consideration transferred over the identifiable net assets acquired in a business combination and represents the future economic benefits expected to arise from anticipated synergies and intangible assets acquired that do not qualify for separate recognition, including assembled workforce, noncontractual relationships and other agreements. We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the carrying amount of a reporting unit may exceed its fair value. We test goodwill for impairment at the reporting unit level. To determine our reporting units, we evaluate the components one level below the segment level and we aggregate the components if they have similar economic characteristics. As a result of this assessment, our reporting units are the same as our five reportable segments. We evaluate the determination of our reporting units used to test for impairment periodically or whenever events or substantive changes in circumstances occur. The assessment of recoverability may first consider qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. The quantitative assessment considers whether the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit’s goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
Cost Method Investments	Cost Method We use the cost method to account for investments not accounted for under the fair value method or the equity method.
Basis of Presentation	The accompanying consolidated financial statements include all entities in which we have a controlling voting interest and variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”).
Foreign Currency Translation	We translate assets and liabilities of our foreign operations where the functional currency is the local currency, primarily the Japanese yen, euro and British pound, into U.S. dollars at the exchange rate as of the balance sheet date and translate revenue and expenses using average monthly exchange rates. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss) in our consolidated balance sheet. Any foreign currency transaction gains or losses are included in our consolidated statement of income.
Use of Estimates	Our consolidated financial statements are prepared in accordance with GAAP, which require us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the reported amount of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and contingent liabilities. Actual results could differ from these estimates. We believe that the judgments and related estimates for the following items are critical in the preparation of our consolidated financial statements: • valuation and impairment testing of cable franchise rights (see Note 9) • film and television costs (see Note 6) In addition, the following accounting policies are specific to the industries in which we operate: • capitalization and amortization of film and television costs (see Note 6) • installation revenue and costs for connecting customers to our cable systems (see revenue recognition below and Note 8)
New Accounting Pronouncements	Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our consolidated financial statements. However, we do expect that the new standard will impact the timing of recognition for (1) our Cable Communications segment’s installation revenue and commission expenses, which upon adoption will be recognized as revenue and costs over a period of time instead of immediately, and (2) our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Consolidations In February 2015, the FASB updated the accounting guidance related to consolidation under the variable interest entity and voting interest entity models. The updated accounting guidance modifies the consolidation guidance for VIEs, limited partnerships and similar legal entities. We have adopted this guidance as of January 1, 2016 and it did not have a material impact on our consolidated financial statements. 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, with certain exceptions, a cumulative effect adjustment to beginning retained earnings when the guidance is adopted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. See Note 16 for a summary of our undiscounted minimum rental commitments under operating leases as of December 31, 2016. 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 are under the current guidance. In addition, the updated guidance requires when an employer withholds shares upon exercise of options or the vesting of restricted stock for the purpose of meeting withholding tax requirements, that the cash paid for withholding taxes be classified as a financing activity. We currently record these amounts within operating activities. We will adopt the updated guidance in the first quarter of 2017. As required under the updated guidance, we will prospectively adopt the provisions of this guidance that relate to the recognition of the excess income tax benefits or deficiencies in the statement of income. If we had adopted the updated guidance in 2016, our income tax expense and effective tax rate would have decreased by $233 million and 1.6% , respectively, and our diluted earnings per common share attributable to Comcast Corporation shareholders in 2016 would have increased by $0.08 . In addition, upon adoption we will retrospectively adopt the provisions of this guidance related to changes to the statement of cash flows in any of the periods presented. The table below presents the effect on our consolidated statement of cash flows for each of the years ended December 31, 2016, 2015 and 2014. These amounts are not necessarily indicative of amounts that we will recognize in future years related to the excess income tax benefits or deficiencies nor the cash paid for withholding taxes.
Revenue Recognition	Revenue Recognition Cable Communications Segment Our Cable Communications segment generates revenue primarily from subscriptions to our video, high-speed Internet and voice services (“cable services”) and from the sale of advertising. We recognize revenue from cable services as each service is provided. Customers are typically billed in advance on a monthly basis based on the services and features they receive and the type of equipment they use. Since installation revenue obtained from the connection of customers to our cable systems is less than the related direct selling costs, we recognize revenue as connections are completed. We manage credit risk by screening applicants through the use of internal customer information, identification verification tools and credit bureau data. If a customer’s account is delinquent, various measures are used to collect outstanding amounts, including termination of the customer’s cable services. As part of our distribution agreements with cable networks, we generally receive an allocation of scheduled advertising time on cable networks that we sell through our advertising business, Spotlight, to local, regional and national advertisers. We recognize advertising revenue when the advertising is aired or viewed. In most cases, the available advertising units are sold by our sales force. In some cases, we work with representation firms as an extension of our sales force to sell a portion of the advertising units allocated to us. We also represent the advertising sales efforts of other multichannel video providers in some markets. Since we are acting as the principal in these arrangements, we record the advertising that is sold in revenue and the fees paid to representation firms and multichannel video providers in other operating and administrative expenses. Revenue earned from other sources, such as our home security and automation services, is recognized when services are provided or events occur. Under the terms of our cable franchise agreements, we are generally required to pay to the cable franchising authority an amount based on our gross video revenue. We pass these fees through to our cable services customers and classify the fees as a component of revenue with the corresponding costs included in other operating and administrative expenses. Cable Networks and Broadcast Television Segments Our Cable Networks segment generates revenue primarily from the distribution of our cable network programming to multichannel video providers, from the sale of advertising on our cable networks and related digital media properties, from the licensing of our owned programming to cable and broadcast networks and subscription video on demand services, from the sale of our owned programming on standard-definition digital video discs and Blu-ray discs (together, “DVDs”) and through digital distribution services such as iTunes, and from the sale of programming by our cable television studio production operations to third-party networks and subscription video on demand services. Our Broadcast Television segment generates revenue primarily from the sale of advertising on our broadcast networks, owned local broadcast television stations and related digital media properties, from the licensing of our owned programming by our broadcast television studio production operations to various distribution platforms, including to cable and broadcast networks as well as to subscription video on demand services, from the fees received under retransmission consent agreements and associated fees received from NBC-affiliated local broadcast television stations, and from the sale of our owned programming on DVDs and through digital distribution services. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee audience ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until the shortfall is settled, primarily by providing additional advertising units. We recognize revenue from the licensing of our owned programming and programming produced by our studios for third parties when the content is made available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the component of revenue associated with the advertisements when they are aired or viewed. Filmed Entertainment Segment Our Filmed Entertainment segment generates revenue primarily from the worldwide distribution of our produced and acquired films for exhibition in movie theaters, from the licensing of our owned and acquired films through various distribution platforms, and from the sale of our owned and acquired films on DVDs and through digital distribution services. Our Filmed Entertainment segment also generates revenue from producing and licensing live stage plays, from the distribution of filmed entertainment produced by third parties, and from Fandango, our movie ticketing and entertainment business. We recognize revenue from the distribution of films to movie theaters when the films are exhibited. We recognize revenue from the licensing of a film when the film is available for use by the licensee, and when certain other conditions are met. We recognize revenue from the sale of DVDs, net of estimated returns and customer incentives, on the date that the DVDs are delivered to and made available for sale by retailers. Theme Parks Segment Our Theme Parks segment generates revenue primarily from ticket sales and guest spending at our Universal theme parks. We recognize revenue from advance theme park ticket sales when the tickets are used. For annual passes, we recognize revenue on a straight-line basis over the period following the activation date.
Cable Communications Programming Expenses	Cable Communications Programming Expenses Cable Communications programming expenses are the fees we pay to license the programming we distribute to our video customers. Programming is generally acquired under multiyear distribution agreements, with rates typically based on the number of customers that receive the programming, channel positioning and the extent of distribution. From time to time, these contracts expire and programming continues to be provided under interim arrangements while the parties negotiate new contract terms, sometimes with effective dates that affect prior periods. While payments are typically made under the prior contract’s terms, the amount of programming expenses recorded during the interim arrangement is based on our estimate of the ultimate contract terms expected to be negotiated. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. When our Cable Communications segment receives incentives from a cable network for the licensing of its programming, we defer a portion of these incentives, which are included in other current and noncurrent liabilities, and recognize them over the term of the contract as a reduction to programming expenses.
Advertising Expenses	Advertising Expenses Advertising costs are expensed as incurred.
Cash Equivalents	Cash Equivalents The carrying amounts of our cash equivalents approximate their fair values. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of three months or less when purchased.
Derivative Financial Instruments	Derivative Financial Instruments We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in interest rates, foreign exchange rates and equity prices. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Our derivative financial instruments are recorded in our consolidated balance sheet at fair value. The impact of our derivative financial instruments on our consolidated financial statements was not material in any of the periods presented.
Fair Value Measurements	Fair Value Measurements The accounting guidance related to financial assets and financial liabilities (“financial instruments”) establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below. • Level 1: Values are determined using quoted market prices for identical financial instruments in an active market • Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable • Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation We use these levels of hierarchy for the measurement of fair value related to acquisitions, investments, long-term debt, redeemable subsidiary preferred stock and impairment testing, among others. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation and classification within the fair value hierarchy. Our financial instruments that are accounted for at fair value on a recurring basis were not material as of December 31, 2016 and 2015.
Asset Retirement Obligations	Asset Retirement Obligations Certain of our cable franchise agreements and lease agreements contain provisions requiring us to restore facilities or remove property in the event that the franchise or lease agreement is not renewed. We expect to continually renew our cable franchise agreements and therefore cannot reasonably estimate any liabilities associated with such agreements. A remote possibility exists that franchise agreements could be terminated unexpectedly, which could result in us incurring significant expense in complying with restoration or removal provisions. We do not have any significant liabilities related to asset retirements recorded in our consolidated financial statements.
Film And Television Costs	Capitalization of Film and Television Costs We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to programming and production expenses. We generally record the amortization and the accrued costs using the individual film forecast computation method, which amortizes the costs in the same ratio as the associated ultimate revenue. Estimates of ultimate revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the distribution of a film in movie theaters or the licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of them. In determining the method of amortization and estimated life of an acquired film or television library, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset. When an event or a change in circumstance occurs that was known or knowable as of the balance sheet date and that indicates the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film’s fair value. The estimated fair value of a production is based on Level 3 inputs that primarily use an analysis of future expected cash flows. Adjustments to capitalized film and stage play production costs of $14 million , $42 million and $26 million were recorded in 2016 , 2015 and 2014 , respectively. We enter into cofinancing arrangements with third parties to jointly finance or distribute certain of our film productions. Cofinancing arrangements can take various forms, but in most cases involve the grant of an economic interest in a film to an investor. The number of investors and the terms of these arrangements can vary, although investors generally assume the full risks and rewards for the portion of the film acquired in these arrangements. We account for the proceeds received from a third-party investor under these arrangements as a reduction to our capitalized film costs. Under these arrangements, the investor owns an undivided copyright interest in the film, and therefore in each period we record either a charge or a benefit to programming and production expenses to reflect the estimate of the third-party investor’s interest in the profit or loss of the film. The estimate of the third-party investor’s interest in the profit or loss of a film is determined using the ratio of actual revenue earned to date to the ultimate revenue expected to be recognized over the film’s useful life. We capitalize the costs of programming content that we license but do not own, including rights to multiyear, live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is made available for use. We amortize capitalized programming costs as the associated programs are broadcast. We generally amortize multiyear, live-event sports programming rights using the ratio of the current period revenue to the estimated ultimate revenue or under the terms of the contract. Acquired programming costs are recorded at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Programming acquired by our Cable Networks segment is primarily tested on a channel basis for impairment, whereas programming acquired by our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we recognize an impairment charge to programming and production expenses.
Investments	Fair Value Method We classify publicly traded investments that are not accounted for under the equity method as available-for-sale (“AFS”) or trading securities and record them at fair value. For AFS securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of other comprehensive income (loss), except when we consider declines in value to be other than temporary. For trading securities, we record unrealized gains or losses resulting from changes in fair value between measurement dates as a component of investment income (loss), net. We recognize realized gains and losses associated with our fair value method investments using the specific identification method. We classify the cash flows related to purchases of and proceeds from the sale of trading securities based on the nature of the securities and the purpose for which they were acquired. Equity Method We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee’s operating and financial policies or in which we hold a significant partnership or LLC interest. Equity method investments are recorded at cost and are adjusted to recognize (1) our proportionate share of the investee’s net income or loss after the date of investment, (2) amortization of the recorded investment that exceeds our share of the book value of the investee’s net assets, (3) additional contributions made and dividends received, and (4) impairments resulting from other-than-temporary declines in fair value. For some investments, we record our share of the investee’s net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net. If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income.
Property and Equipment	Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. We record depreciation using the straight-line method over the asset’s estimated useful life. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense. In accordance with the accounting guidance related to cable television companies, we capitalize the costs associated with the construction of and improvements to our cable transmission and distribution facilities, including scalable infrastructure and line extensions; costs associated with acquiring and deploying new customer premise equipment; and costs associated with installation of our services. Costs capitalized include all direct costs for labor and materials, as well as various indirect costs. Costs incurred in connection with subsequent disconnects and reconnects are expensed as they are incurred. We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.
Indefinite-Lived Intangible Assets	Indefinite-Lived Intangible Assets Indefinite-lived intangible assets consist primarily of our cable franchise rights. Our cable franchise rights represent the values we attributed to agreements with state and local authorities that allow access to homes and businesses in cable service areas acquired in business combinations. We do not amortize our cable franchise rights because we have determined that they meet the definition of indefinite-lived intangible assets since there are no legal, regulatory, contractual, competitive, economic or other factors which limit the period over which these rights will contribute to our cash flows. We reassess this determination periodically or whenever events or substantive changes in circumstances occur. Costs we incur in negotiating and renewing cable franchise agreements are included in other intangible assets and are generally amortized on a straight-line basis over the term of the franchise agreement. We assess the recoverability of our cable franchise rights and other indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. Our three Cable Communications divisions represent the unit of account we use to test for impairment of our cable franchise rights. We evaluate the unit of account used to test for impairment of our cable franchise rights and other indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The assessment of recoverability may first consider qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. When performing a quantitative assessment, we estimate the fair value of our cable franchise rights and other indefinite-lived intangible assets primarily based on a discounted cash flow analysis that involves significant judgment. When analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the fair value of our cable franchise rights or other indefinite-lived intangible assets was less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any material impairment charges in any of the periods presented.
Definite-Lived Intangible Assets	Finite-lived intangible assets are subject to amortization and consist primarily of customer relationships acquired in business combinations, software, cable franchise renewal costs, contractual operating rights and intellectual property rights. Our finite-lived intangible assets are amortized primarily on a straight-line basis over their estimated useful life or the term of the associated agreement. We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs in other intangible assets and generally amortize them on a straight-line basis over a period not to exceed five years . We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware. We evaluate the recoverability of our finite-lived intangible assets whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
Share-Based Compensation	As of December 31, 2016 , substantially all of our stock options outstanding were net settled stock options. Net settled stock options, as opposed to stock options exercised with a cash payment, result in fewer shares being issued and no cash proceeds being received by us when the options are exercised. Our share-based compensation primarily consists of awards of RSUs and stock options to certain employees and directors as part of our approach to long-term incentive compensation. Awards generally vest over a period of 5 years and in the case of stock options, have a 10 year term. Additionally, through our employee stock purchase plans, employees are able to purchase shares of Comcast common stock at a discount through payroll deductions. The cost associated with our share-based compensation is based on an award’s estimated fair value at the date of grant and is recognized over the period in which any related services are provided. RSUs are valued based on the closing price of our common stock on the date of grant and are discounted for the lack of dividends, if any, during the vesting period. We use the Black-Scholes option pricing model to estimate the fair value of stock option awards. The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under our various plans and the related weighted-average valuation assumptions.
Postretirement and Pension Benefits	All of our postretirement benefit plans are unfunded and substantially all of our postretirement benefit obligations are recorded to noncurrent liabilities. The expense we recognize for our postretirement benefit plans is determined using certain assumptions, including the discount rate. Pension Plans NBCUniversal sponsors various qualified and nonqualified defined benefit pension plans for domestic employees. Since the future benefits have been frozen since the beginning of 2013, we did not recognize service costs related to the pension plans for all periods presented. The benefits expense we recognized for our defined benefit plans was not material for all periods presented. In addition to the defined benefit plans it sponsors, NBCUniversal is also obligated to reimburse General Electric (“GE”) for future benefit payments to those participants who were vested in the supplemental pension plan sponsored by GE at the time of the NBCUniversal transaction in 2011.
Income Taxes	We base our provision for income taxes on our current period income, changes in our deferred income tax assets and liabilities, income tax rates, changes in estimates of our uncertain tax positions, and tax planning opportunities available in the jurisdictions in which we operate. We recognize deferred tax assets and liabilities when there are temporary differences between the financial reporting basis and tax basis of our assets and liabilities and for the expected benefits of using net operating loss carryforwards. When a change in the tax rate or tax law has an impact on deferred taxes, we apply the change based on the years in which the temporary differences are expected to reverse. We record the change in our consolidated financial statements in the period of enactment. The determination of the income tax consequences of a business combination includes identifying the tax basis of assets and liabilities acquired and any contingencies associated with uncertain tax positions assumed or resulting from the business combination. Deferred tax assets and liabilities related to temporary differences of an acquired entity are recorded as of the date of the business combination and are based on our estimate of the ultimate tax basis that will be accepted by the various tax authorities. We record liabilities for contingencies associated with prior tax returns filed by the acquired entity based on criteria set forth in the appropriate accounting guidance. We adjust the deferred tax accounts and the liabilities periodically to reflect any revised estimated tax basis and any estimated settlements with the various tax authorities. The effects of these adjustments are recorded to income tax expense. From time to time, we engage in transactions in which the tax consequences may be subject to uncertainty. In these cases, we evaluate our tax position using the recognition threshold and the measurement attribute in accordance with the accounting guidance related to uncertain tax positions. Examples of these transactions include business acquisitions and dispositions, including consideration paid or received in connection with these transactions, certain financing transactions, and the allocation of income among state and local tax jurisdictions. Significant judgment is required in assessing and estimating the tax consequences of these transactions. We determine whether it is more likely than not that a tax position will be sustained on examination, including the resolution of any related appeals or litigation processes, based on the technical merits of the position. A tax position that meets the more-likely-than-not recognition threshold is measured to determine the amount of benefit to be recognized in our consolidated financial statements. We classify interest and penalties, if any, associated with our uncertain tax positions as a component of income tax expense.
Earnings Per Share	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”). Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the combination of the option exercise price and the associated unrecognized compensation expense is greater than the average market price of our common stock.
NBCUniversal Media LLC [Member]
Accounting Policies [Line Items]
Impairment Testing of Investments	Impairment Testing of Investments We review our investment portfolio each reporting period to determine whether there are identified events or circumstances that would indicate there is a decline in the fair value that would be considered other than temporary. For our nonpublic investments, if there are no identified events or circumstances that would have a significant adverse effect on the fair value of the investment, then the fair value is not estimated. If an investment is deemed to have experienced an other-than-temporary decline below its cost basis, we reduce the carrying amount of the investment to its quoted or estimated fair value, as applicable, and establish a new cost basis for the investment. For our available-for-sale securities and our cost method investments, we record the impairment to investment income (loss), net. For our equity method investments, we record the impairment to other income (expense), net.
Goodwill	Goodwill is calculated as the excess of the consideration transferred over the identifiable net assets acquired in a business combination and represents the future economic benefits expected to arise from anticipated synergies and intangible assets acquired that do not qualify for separate recognition, including assembled workforce, noncontractual relationships and other agreements. We assess the recoverability of our goodwill annually, or more frequently whenever events or substantive changes in circumstances indicate that the carrying amount of a reporting unit may exceed its fair value. We test goodwill for impairment at the reporting unit level. To determine our reporting units, we evaluate the components one level below the segment level and we aggregate the components if they have similar economic characteristics. As a result of this assessment, our reporting units are the same as our four reportable segments. We evaluate the determination of our reporting units used to test for impairment periodically or whenever events or substantive changes in circumstances occur. The assessment of recoverability may first consider qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. The quantitative assessment considers whether the carrying amount of a reporting unit exceeds its fair value, in which case an impairment charge is recorded to the extent the carrying amount of the reporting unit’s goodwill exceeds its implied fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
Cost Method Investments	Cost Method We use the cost method to account for investments not accounted for under the fair value method or the equity method.
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements include all entities in which we have a controlling voting interest and variable interest entities (“VIEs”) required to be consolidated in accordance with generally accepted accounting principles in the United States (“GAAP”). Transactions between NBCUniversal and both Comcast and Comcast’s consolidated subsidiaries are reflected in these consolidated financial statements and disclosed as related party transactions when material.
Foreign Currency Translation	We translate assets and liabilities of our foreign operations where the functional currency is the local currency, primarily the Japanese yen, euro and British pound, into U.S. dollars at the exchange rate as of the balance sheet date and translate revenue and expenses using average monthly exchange rates. The related translation adjustments are recorded as a component of accumulated other comprehensive income (loss) in our consolidated balance sheet. Any foreign currency transaction gains or losses are included in our consolidated statement of income.
Use of Estimates	Our consolidated financial statements are prepared in accordance with GAAP, which require us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the reported amount of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and contingent liabilities. Actual results could differ from these estimates. We believe that the judgments and related estimates for the following items are critical in the preparation of our consolidated financial statements: • revenue recognition (see below) • film and television costs (see Note 6) • goodwill and intangible assets (see Note 9) In addition, the following accounting policy is specific to the industries in which we operate: • capitalization and amortization of film and television costs (see Note 6) Information on our other accounting policies and methods that are used in the preparation of our consolidated financial statements are included, where applicable, in their respective footnotes that follow. Below is a discussion of accounting policies and methods used in our consolidated financial statements that are not presented within other footnotes.
New Accounting Pronouncements	Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue and by reducing the number of standards to which an entity has to refer. The updated accounting guidance is effective for us as of January 1, 2018. We have reviewed a majority of our revenue arrangements and expect our review to be completed in the second quarter of 2017. As a result of our review, we do not expect any material impact on our consolidated financial statements. However, we do expect that the new standard will impact the timing of recognition for our Cable Networks, Broadcast Television and Filmed Entertainment segments’ content licensing revenue associated with renewals or extensions of existing program licensing agreements, which upon adoption will be recognized as revenue when the licensed content becomes available under the renewal or extension instead of when the agreement is renewed or extended. The guidance provides companies with alternative methods of adoption and we are in the process of determining our method of adoption, which depends in part upon our completion of the evaluation of our remaining revenue arrangements. Consolidations In February 2015, the FASB updated the accounting guidance related to consolidation under the variable interest entity and voting interest entity models. The updated accounting guidance modifies the consolidation guidance for VIEs, limited partnerships and similar legal entities. We have adopted this guidance as of January 1, 2016 and it did not have a material impact on our consolidated financial statements. 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, with certain exceptions, a cumulative effect adjustment to beginning retained earnings when the guidance is adopted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Leases In February 2016, the FASB updated the accounting guidance related to leases. The updated accounting guidance requires lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. The asset and liability are initially measured based on the present value of committed lease payments. For a lessee, the recognition, measurement and presentation of expenses and cash flows arising from a lease do not significantly change from previous guidance. For a lessor, the accounting applied is also largely unchanged from previous guidance. The updated guidance is effective for us as of January 1, 2019 and early adoption is permitted. The updated accounting guidance must be adopted using a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. See Note 15 for a summary of our undiscounted minimum rental commitments under operating leases as of December 31, 2016. Share-Based Compensation In March 2016, the FASB updated the accounting guidance that affects several aspects of the accounting for share-based compensation. 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 are under the current guidance. In addition, the updated guidance requires when an employer withholds shares upon exercise of options or the vesting of restricted stock for the purpose of meeting withholding tax requirements, that the cash paid for withholding taxes be classified as a financing activity. We will adopt the updated guidance in the first quarter of 2017. As a limited liability company, the updated guidance related to the excess income tax benefits or deficiencies to be recognized in the statement of income will not have a material impact on our consolidated financial statements. In addition, as the share-based compensation expense is settled in cash with Comcast, we do not expect the updated accounting guidance to have a material impact on our statement of cash flows.
Revenue Recognition	Revenue Recognition Cable Networks and Broadcast Television Segments Our Cable Networks segment generates revenue primarily from the distribution of our cable network programming to multichannel video providers, from the sale of advertising on our cable networks and related digital media properties, from the licensing of our owned programming to cable and broadcast networks and subscription video on demand services, from the sale of our owned programming on standard-definition digital video discs and Blu-ray discs (together, “DVDs”) and through digital distribution services such as iTunes, and from the sale of programming by our cable television studio production operations to third-party networks and subscription video on demand services. Our Broadcast Television segment generates revenue primarily from the sale of advertising on our broadcast networks, owned local broadcast television stations and related digital media properties, from the licensing of our owned programming by our broadcast television studio production operations to various distribution platforms, including to cable and broadcast networks as well as to subscription video on demand services, from the fees received under retransmission consent agreements and associated fees received from NBC-affiliated local broadcast television stations, and from the sale of our owned programming on DVDs and through digital distribution services. We recognize revenue from distributors as programming is provided, generally under multiyear distribution agreements. From time to time, the distribution agreements expire while programming continues to be provided to the distributor based on interim arrangements while the parties negotiate new contract terms. Revenue recognition is generally limited to current payments being made by the distributor, typically under the prior contract terms, until a new contract is negotiated, sometimes with effective dates that affect prior periods. Differences between actual amounts determined upon resolution of negotiations and amounts recorded during these interim arrangements are recorded in the period of resolution. Advertising revenue for our Cable Networks and Broadcast Television segments is recognized in the period in which commercials are aired or viewed. In some instances, we guarantee audience ratings for the commercials. To the extent there is a shortfall in the ratings that were guaranteed, a portion of the revenue is deferred until the shortfall is settled, primarily by providing additional advertising units. We recognize revenue from the licensing of our owned programming and programming produced by our studios for third parties when the content is made available for use by the licensee, and when certain other conditions are met. When license fees include advertising time, we recognize the component of revenue associated with the advertisements when they are aired or viewed. Filmed Entertainment Segment Our Filmed Entertainment segment generates revenue primarily from the worldwide distribution of our produced and acquired films for exhibition in movie theaters, from the licensing of our owned and acquired films through various distribution platforms, and from the sale of our owned and acquired films on DVDs and through digital distribution services. Our Filmed Entertainment segment also generates revenue from producing and licensing live stage plays, from the distribution of filmed entertainment produced by third parties, and from Fandango, our movie ticketing and entertainment business. We recognize revenue from the distribution of films to movie theaters when the films are exhibited. We recognize revenue from the licensing of a film when the film is available for use by the licensee, and when certain other conditions are met. We recognize revenue from the sale of DVDs, net of estimated returns and customer incentives, on the date that the DVDs are delivered to and made available for sale by retailers. Theme Parks Segment Our Theme Parks segment generates revenue primarily from ticket sales and guest spending at our Universal theme parks. We recognize revenue from advance theme park ticket sales when the tickets are used. For annual passes, we recognize revenue on a straight-line basis over the period following the activation date.
Advertising Expenses	Advertising Expenses Advertising costs are expensed as incurred.
Cash Equivalents	Cash Equivalents The carrying amounts of our cash equivalents approximate their fair values. Our cash equivalents consist primarily of money market funds and U.S. government obligations, as well as commercial paper and certificates of deposit with maturities of three months or less when purchased.
Derivative Financial Instruments	Derivative Financial Instruments We use derivative financial instruments to manage our exposure to the risks associated with fluctuations in foreign exchange rates and interest rates. Our objective is to manage the financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the derivatives used to economically hedge them. Our derivative financial instruments are recorded in our consolidated balance sheet at fair value. The impact of our derivative financial instruments on our consolidated financial statements was not material for all periods presented.
Fair Value Measurements	Fair Value Measurements The accounting guidance related to financial assets and financial liabilities (“financial instruments”) establishes a hierarchy that prioritizes fair value measurements based on the types of inputs used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below. • Level 1: Values are determined using quoted market prices for identical financial instruments in an active market • Level 2: Values are determined using quoted prices for similar financial instruments and valuation models whose inputs are observable • Level 3: Values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation We use these levels of hierarchy for the measurement of fair value related to acquisitions, investments, long-term debt and impairment testing, among others. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation and classification within the fair value hierarchy. Our financial instruments that are accounted for at fair value on a recurring basis were not material as of December 31, 2016 and 2015.
Film And Television Costs	Capitalization of Film and Television Costs We capitalize film and television production costs, including direct costs, production overhead, print costs, development costs and interest. We amortize capitalized film and television production costs, including acquired libraries, and accrue costs associated with participation and residual payments to programming and production expenses. We generally record the amortization and the accrued costs using the individual film forecast computation method, which amortizes the costs in the same ratio as the associated ultimate revenue. Estimates of ultimate revenue and total costs are based on anticipated release patterns, public acceptance and historical results for similar productions. Unamortized film and television costs, including acquired film and television libraries, are stated at the lower of unamortized cost or fair value. We do not capitalize costs related to the distribution of a film in movie theaters or the licensing or sale of a film or television production, which are primarily costs associated with the marketing and distribution of them. In determining the method of amortization and estimated life of an acquired film or television library, we generally use the method and the life that most closely follow the undiscounted cash flows over the estimated life of the asset. When an event or a change in circumstance occurs that was known or knowable as of the balance sheet date and that indicates the fair value of a film is less than its unamortized costs, we determine the fair value of the film and record an impairment charge for the amount by which the unamortized capitalized costs exceed the film’s fair value. The estimated fair value of a production is based on Level 3 inputs that primarily use an analysis of future expected cash flows. Adjustments to capitalized film and stage play production costs of $14 million , $42 million and $26 million were recorded in 2016 , 2015 and 2014 , respectively. We enter into cofinancing arrangements with third parties to jointly finance or distribute certain of our film productions. Cofinancing arrangements can take various forms, but in most cases involve the grant of an economic interest in a film to an investor. The number of investors and the terms of these arrangements can vary, although investors generally assume the full risks and rewards for the portion of the film acquired in these arrangements. We account for the proceeds received from a third-party investor under these arrangements as a reduction to our capitalized film costs. Under these arrangements, the investor owns an undivided copyright interest in the film, and therefore in each period we record either a charge or a benefit to programming and production expenses to reflect the estimate of the third-party investor’s interest in the profit or loss of the film. The estimate of the third-party investor’s interest in the profit or loss of a film is determined using the ratio of actual revenue earned to date to the ultimate revenue expected to be recognized over the film’s useful life. We capitalize the costs of programming content that we license but do not own, including rights to multiyear, live-event sports programming, at the earlier of when payments are made for the programming or when the license period begins and the content is made available for use. We amortize capitalized programming costs as the associated programs are broadcast. We generally amortize multiyear, live-event sports programming rights using the ratio of the current period revenue to the estimated ultimate revenue or under the terms of the contract. Acquired programming costs are recorded at the lower of unamortized cost or net realizable value on a program by program, package, channel or daypart basis. A daypart is an aggregation of programs broadcast during a particular time of day or programs of a similar type. Programming acquired by our Cable Networks segment is primarily tested on a channel basis for impairment, whereas programming acquired by our Broadcast Television segment is tested on a daypart basis. If we determine that the estimates of future cash flows are insufficient or if there is no plan to broadcast certain programming, we recognize an impairment charge to programming and production expenses.
Investments	Equity Method We use the equity method to account for investments in which we have the ability to exercise significant influence over the investee’s operating and financial policies or in which we hold a significant partnership or LLC interest. Equity method investments are recorded at cost and are adjusted to recognize (1) our proportionate share of the investee’s net income or loss after the date of investment, (2) amortization of the recorded investment that exceeds our share of the book value of the investee’s net assets, (3) additional contributions made and dividends received, and (4) impairments resulting from other-than-temporary declines in fair value. For some investments, we record our share of the investee’s net income or loss one quarter in arrears due to the timing of our receipt of such information. Gains or losses on the sale of equity method investments are recorded to other income (expense), net. If an equity method investee were to issue additional securities that would change our proportionate share of the entity, we would recognize the change, if any, as a gain or loss in our consolidated statement of income.
Property and Equipment	Property and equipment are stated at cost. We capitalize improvements that extend asset lives and expense repairs and maintenance costs as incurred. We record depreciation using the straight-line method over the asset’s estimated useful life. For assets that are sold or retired, we remove the applicable cost and accumulated depreciation and, unless the gain or loss on disposition is presented separately, we recognize it as a component of depreciation expense. We evaluate the recoverability of our property and equipment whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of depreciation expense.
Indefinite-Lived Intangible Assets	Indefinite-Lived Intangible Assets Indefinite-lived intangible assets consist of trade names and FCC licenses. We assess the recoverability of our indefinite-lived intangible assets annually, or more frequently whenever events or substantive changes in circumstances indicate that the assets might be impaired. We evaluate the unit of account used to test for impairment of our indefinite-lived intangible assets periodically or whenever events or substantive changes in circumstances occur to ensure impairment testing is performed at an appropriate level. The assessment of recoverability may first consider qualitative factors to determine whether it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. A quantitative assessment is performed if the qualitative assessment results in a more-likely-than-not determination or if a qualitative assessment is not performed. When performing a quantitative assessment, we estimate the fair value of our indefinite-lived intangible assets primarily based on a discounted cash flow analysis that involves significant judgment. When analyzing the fair values indicated under the discounted cash flow models, we also consider multiples of operating income before depreciation and amortization generated by the underlying assets, current market transactions, and profitability information. If the fair value of our indefinite-lived intangible assets was less than the carrying amount, we would recognize an impairment charge for the difference between the estimated fair value and the carrying value of the assets. Unless presented separately, the impairment charge is included as a component of amortization expense. We did not recognize any material impairment charges in any of the periods presented.
Definite-Lived Intangible Assets	Finite-lived intangible assets are subject to amortization and consist primarily of customer relationships acquired in business combinations, intellectual property rights and software. Our finite-lived intangible assets are amortized primarily on a straight-line basis over their estimated useful life or the term of the associated agreement. We capitalize direct development costs associated with internal-use software, including external direct costs of material and services and payroll costs for employees devoting time to these software projects. We also capitalize costs associated with the purchase of software licenses. We include these costs in intangible assets and generally amortize them on a straight-line basis over a period not to exceed five years . We expense maintenance and training costs, as well as costs incurred during the preliminary stage of a project, as they are incurred. We capitalize initial operating system software costs and amortize them over the life of the associated hardware. We evaluate the recoverability of our finite-lived intangible assets whenever events or substantive changes in circumstances indicate that the carrying amount may not be recoverable. The evaluation is based on the cash flows generated by the underlying asset groups, including estimated future operating results, trends or other determinants of fair value. If the total of the expected future undiscounted cash flows were less than the carrying amount of the asset group, we would recognize an impairment charge to the extent the carrying amount of the asset group exceeded its estimated fair value. Unless presented separately, the impairment charge is included as a component of amortization expense.
Share-Based Compensation	Comcast maintains share-based compensation plans that primarily consist of awards of RSUs and stock options to certain employees and directors as part of its approach to long-term incentive compensation. Awards generally vest over a period of 5 years and in the case of stock options, have a 10 year term. 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. The cost associated with Comcast’s share-based compensation is based on an award’s estimated fair value at the date of grant and is recognized over the period in which any related services are provided. RSUs are valued based on the closing price of Comcast common stock on the date of grant and are discounted for the lack of dividends, if any, during the vesting period. Comcast uses the Black-Scholes option pricing model to estimate the fair value of stock option awards. The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under Comcast’s various plans to employees of NBCUniversal and the related weighted-average valuation assumptions.
Postretirement and Pension Benefits	All of our postretirement benefit plans are unfunded and substantially all of our postretirement benefit obligations are recorded to noncurrent liabilities. The expense we recognize for our postretirement benefit plans is determined using certain assumptions, including the discount rate. Pension Plans We sponsor various qualified and nonqualified defined benefit pension plans for domestic employees. Since the future benefits have been frozen since the beginning of 2013, we did not recognize service costs related to our pension plans for all periods presented. The benefits expense we recognized for our defined benefit plans was not material for all periods presented. In addition to the defined benefit plans we sponsor, we are also obligated to reimburse General Electric (“GE”) for future benefit payments to those participants who were vested in the supplemental pension plan sponsored by GE at the time of the joint venture transaction.

Recent Accounting Pronounceme31

Recent Accounting Pronouncements (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Schedule of changes related to adoption of new accounting pronouncement	The table below presents the effect on our consolidated statement of cash flows for each of the years ended December 31, 2016, 2015 and 2014. These amounts are not necessarily indicative of amounts that we will recognize in future years related to the excess income tax benefits or deficiencies nor the cash paid for withholding taxes. Year ended December 31 (in millions) As Reported Effect of Adoption Upon Adoption 2016 Net cash provided by operating activities $ 19,240 $ 585 $ 19,825 Net cash provided by (used in) financing activities $ 151 $ (585 ) $ (434 ) 2015 Net cash provided by operating activities $ 18,778 $ 708 $ 19,486 Net cash provided by (used in) financing activities $ (8,429 ) $ (708 ) $ (9,137 ) 2014 Net cash provided by operating activities $ 16,945 $ 652 $ 17,597 Net cash provided by (used in) financing activities $ (6,020 ) $ (652 ) $ (6,672 )

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Computation of diluted EPS	Computation of Diluted EPS 2016 2015 2014 Year ended December 31 Net Income Shares Per Share Net Income Shares Per Share Net Income Shares Per Share Basic EPS attributable to Comcast Corporation shareholders $ 8,695 2,410 $ 3.61 $ 8,163 2,486 $ 3.28 $ 8,380 2,583 $ 3.24 Effect of dilutive securities: Assumed exercise or issuance of shares relating to stock plans 28 32 37 Diluted EPS attributable to Comcast Corporation shareholders $ 8,695 2,438 $ 3.57 $ 8,163 2,518 $ 3.24 $ 8,380 2,620 $ 3.20

Significant Transactions (Table

Significant Transactions (Tables)	12 Months Ended
	Dec. 31, 2016
Business Acquisition [Line Items]
Unaudited Pro Forma Information	Year ended December 31 (in millions, except per share amounts) 2015 2014 Revenue $ 75,563 $ 69,860 Net income $ 8,591 $ 8,704 Net income attributable to Comcast Corporation $ 8,253 $ 8,435 Basic earnings per common share attributable to Comcast Corporation shareholders $ 3.32 $ 3.27 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 3.28 $ 3.22
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Unaudited Pro Forma Information	Year ended December 31 (in millions) 2015 2014 Revenue $ 29,514 $ 26,513 Net income $ 3,801 $ 3,409 Net income attributable to NBCUniversal $ 3,503 $ 3,170
DreamWorks Animation [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	Preliminary Allocation of Purchase Price (in millions) Film and television costs (see Note 6) $ 854 Intangible assets (see Note 9) 164 Working capital 248 Debt (see Note 10) (381 ) Tax receivable agreement (146 ) Deferred income taxes (see Note 14) 366 Other noncurrent assets and liabilities 137 Identifiable net assets (liabilities) acquired 1,242 Noncontrolling interest (89 ) Goodwill (see Note 9) 2,620 Cash consideration transferred $ 3,773
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	Preliminary Allocation of Purchase Price (in millions) Film and television costs (see Note 6) $ 854 Intangible assets (see Note 9) 164 Working capital 248 Debt (see Note 10) (381 ) Tax receivable agreement (a) (146 ) Other noncurrent assets and liabilities and other (b) 503 Identifiable net assets (liabilities) acquired 1,242 Noncontrolling interest (89 ) Goodwill (see Note 9) 2,620 Cash consideration transferred by Comcast $ 3,773 (a) The tax receivable agreement was settled immediately following the acquisition and the payment was recorded as an operating activity in our consolidated statement of cash flows. Comcast made a separate cash capital contribution of $146 million to fund the settlement which was recorded as a financing activity in our consolidated statement of cash flows. (b) Other included $353 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.
Universal Studios Japan [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	Allocation of Purchase Price (in millions) Property and equipment (see Note 8) $ 780 Intangible assets (see Note 9) 323 Working capital (33 ) Debt (see Note 10) (3,271 ) Other noncurrent assets and liabilities 17 Identifiable net assets (liabilities) acquired (2,184 ) Noncontrolling interest (1,440 ) Goodwill (see Note 9) 5,123 Cash consideration transferred $ 1,499
Universal Studios Japan [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition	Allocation of Purchase Price (in millions) Property and equipment (see Note 8) $ 780 Intangible assets (see Note 9) 323 Working capital (33 ) Debt (see Note 10) (3,271 ) Other noncurrent assets and liabilities and other 17 Identifiable net assets (liabilities) acquired (2,184 ) Noncontrolling interest (1,440 ) Goodwill (see Note 9) 5,123 Cash consideration transferred $ 1,499

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2016
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 consolidated financial statements. Consolidated Balance Sheet December 31 (in millions) 2016 2015 Transactions with Comcast and Consolidated Subsidiaries Receivables, net $ 285 $ 239 Accounts payable and accrued expenses related to trade creditors $ 55 $ 68 Accrued expenses and other current liabilities $ 4 $ 51 Note payable to Comcast $ 2,703 $ 1,750 Other noncurrent liabilities $ 389 $ 383 Consolidated Statement of Income Year ended December 31 (in millions) 2016 2015 2014 Transactions with Comcast and Consolidated Subsidiaries Revenue $ 1,742 $ 1,349 $ 1,315 Operating costs and expenses $ (220 ) $ (246 ) $ (162 ) Other income (expense) $ (69 ) $ (37 ) $ (43 )

Film and Television Costs (Tabl

Film and Television Costs (Tables)	12 Months Ended
	Dec. 31, 2016
Film And Television Cost [Line Items]
Film and Television Costs	December 31 (in millions) 2016 2015 Film Costs: Released, less amortization $ 1,750 $ 1,275 Completed, not released 50 226 In production and in development 1,310 907 3,110 2,408 Television Costs: Released, less amortization 1,953 1,573 In production and in development 853 737 2,806 2,310 Programming rights, less amortization 2,586 2,350 8,502 7,068 Less: Current portion of programming rights 1,250 1,213 Film and television costs $ 7,252 $ 5,855
NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Film and Television Costs	December 31 (in millions) 2016 2015 Film Costs: Released, less amortization $ 1,750 $ 1,275 Completed, not released 50 226 In production and in development 1,310 907 3,110 2,408 Television Costs: Released, less amortization 1,953 1,573 In production and in development 853 737 2,806 2,310 Programming rights, less amortization 2,570 2,329 8,486 7,047 Less: Current portion of programming rights 1,241 1,200 Film and television costs $ 7,245 $ 5,847

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value, Equity And Cost Method Investments [Line Items]
Investment Summary	December 31 (in millions) 2016 2015 Fair Value Method $ 198 $ 167 Equity Method: Atairos 1,601 — Hulu 225 184 Other 550 494 2,376 678 Cost Method: AirTouch 1,599 1,583 BuzzFeed 400 200 Other 771 702 2,770 2,485 Total investments 5,344 3,330 Less: Current investments 97 106 Noncurrent investments $ 5,247 $ 3,224
Investment Income (Loss), Net	Investment Income (Loss), Net Year ended December 31 (in millions) 2016 2015 2014 Gains on sales and exchanges of investments, net $ 46 $ 12 $ 192 Investment impairment losses (34 ) (59 ) (50 ) Unrealized gains on securities underlying prepaid forward sale agreements — 42 66 Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments (4 ) (42 ) (56 ) Interest and dividend income 123 115 116 Other, net 82 13 28 Investment income (loss), net $ 213 $ 81 $ 296
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Investment Summary	December 31 (in millions) 2016 2015 Fair Value Method $ 6 $ 10 Equity Method: Hulu 225 184 Other 336 313 561 497 Cost Method: BuzzFeed 400 200 Other 296 258 696 458 Total investments $ 1,263 $ 965
Summarized Financial Information	The tables below present the summarized combined financial information of our equity method investments. December 31 (in millions) 2016 2015 Current assets $ 2,105 $ 1,904 Noncurrent assets $ 2,724 $ 3,584 Current liabilities $ 1,921 $ 1,225 Noncurrent liabilities $ 2,853 $ 4,879 Year ended December 31 (in millions) 2016 2015 2014 Revenue $ 4,285 $ 3,944 $ 3,756 Operating income (loss) $ (182 ) $ (1,609 ) $ 483 Net income (loss) $ (313 ) $ (1,820 ) $ 243

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and Equipment	December 31 (in millions) Weighted-Average 2016 2015 Cable distribution system 11 years $ 34,028 $ 32,586 Customer premise equipment 6 years 28,621 28,559 Other equipment 8 years 9,475 8,539 Buildings and leasehold improvements 29 years 12,550 10,829 Land N/A 1,273 1,252 Property and equipment, at cost 85,947 81,765 Less: Accumulated depreciation 49,694 48,100 Property and equipment, net $ 36,253 $ 33,665
NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment	December 31 (in millions) Weighted-Average 2016 2015 Buildings and leasehold improvements 30 years $ 7,543 $ 6,543 Furniture, fixtures and equipment 11 years 4,158 3,457 Construction in process N/A 1,176 1,339 Land N/A 984 961 Property and equipment, at cost 13,861 12,300 Less: Accumulated depreciation 3,350 2,779 Property and equipment, net $ 10,511 $ 9,521

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill And Intangible Assets [Line Items]
Schedule of Goodwill	Goodwill NBCUniversal (in millions) Cable Cable Broadcast Filmed Theme Corporate Total Balance, December 31, 2014 $ 12,217 $ 12,948 $ 767 $ 211 $ 982 $ 191 $ 27,316 Acquisitions (a) 173 17 39 58 5,373 1 5,661 Adjustments (1 ) — — — — — (1 ) Foreign currency translation — (18 ) — (2 ) (11 ) — (31 ) Balance, December 31, 2015 12,389 12,947 806 267 6,344 192 32,945 Acquisitions (b) 82 232 — 2,717 — 1 3,032 Adjustments (c) 174 — — — (250 ) (181 ) (257 ) Foreign currency translation — 4 — 9 247 — 260 Balance, December 31, 2016 $ 12,645 $ 13,183 $ 806 $ 2,993 $ 6,341 $ 12 $ 35,980 (a) Acquisitions in 2015 in our Theme Parks segment included the Universal Studios Japan transaction (see Note 5 for additional information). (b) Acquisitions in 2016 in our Filmed Entertainment segment primarily included the DreamWorks Animation acquisition (see Note 5 for additional information). (c) Adjustments in 2016 primarily included the updated allocation of the purchase price for Universal Studios Japan in our Theme Parks segment (see Note 5 for additional information) and the reclassification of certain operations and businesses from Corporate and Other to our Cable Communications segment.
Other Intangible Assets	Intangible Assets 2016 2015 December 31 (in millions) Weighted-Average Original Useful Life as of December 31, 2016 Gross Carrying Amount Accumulated Amortization Gross Carrying Amount Accumulated Amortization Indefinite-Lived Intangible Assets: Franchise rights N/A $ 59,364 $ 59,364 Trade names N/A 2,981 2,857 FCC licenses N/A 651 651 Finite-Lived Intangible Assets: Customer relationships 19 years 13,478 $ (5,110 ) 13,396 $ (4,442 ) Software 4 years 7,017 (3,997 ) 6,008 (3,429 ) Cable franchise renewal costs and contractual operating rights 9 years 1,460 (800 ) 1,499 (849 ) Patents and other technology rights 7 years 257 (208 ) 409 (350 ) Other agreements and rights 15 years 2,443 (898 ) 1,994 (798 ) Total $ 87,651 $ (11,013 ) $ 86,178 $ (9,868 )
Amortization of Intangible Assets	Estimated Amortization Expense of Finite-Lived Intangible Assets (in millions) 2017 $ 2,077 2018 $ 1,828 2019 $ 1,475 2020 $ 1,168 2021 $ 939
NBCUniversal Media LLC [Member]
Goodwill And Intangible Assets [Line Items]
Schedule of Goodwill	Goodwill (in millions) Cable Broadcast Filmed Theme Total Balance, December 31, 2014 $ 12,948 $ 767 $ 211 $ 982 $ 14,908 Acquisitions (a) 17 39 58 5,373 5,487 Foreign currency translation (18 ) — (2 ) (11 ) (31 ) Balance, December 31, 2015 12,947 806 267 6,344 20,364 Acquisitions (b) 232 — 2,717 — 2,949 Adjustments (c) — — — (250 ) (250 ) Foreign currency translation 4 — 9 247 260 Balance, December 31, 2016 $ 13,183 $ 806 $ 2,993 $ 6,341 $ 23,323 (a) Acquisitions in 2015 in our Theme Parks segment included the Universal Studios Japan transaction (see Note 4 for additional information). (b) Acquisitions in 2016 in our Filmed Entertainment segment primarily included the DreamWorks Animation acquisition (see Note 4 for additional information). (c) Adjustments in 2016 included the updated allocation of the purchase price for Universal Studios Japan in our Theme Parks segment (see Note 4 for additional information).
Other Intangible Assets	Intangible Assets 2016 2015 December 31 (in millions) Weighted-Average Gross Accumulated Gross Accumulated Finite-Lived Intangible Assets: Customer relationships 19 years $ 13,173 $ (4,952 ) $ 13,107 $ (4,291 ) Software 5 years 1,195 (563 ) 849 (431 ) Other 15 years 2,345 (1,053 ) 1,996 (932 ) Indefinite-Lived Intangible Assets: Trade names N/A 2,981 2,857 FCC licenses N/A 651 651 Total $ 20,345 $ (6,568 ) $ 19,460 $ (5,654 )
Amortization of Intangible Assets	Estimated Amortization Expense of Finite-Lived Intangible Assets (in millions) 2017 $ 946 2018 $ 929 2019 $ 900 2020 $ 873 2021 $ 804

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Long-Term Debt Outstanding December 31 (in millions) Weighted-Average Interest Rate as of December 31, 2016 2016 2015 Commercial paper 1.01 % $ 2,781 $ 975 Revolving bank credit facilities — % — — Term loans (a) 2.93 % 3,262 3,259 Senior notes with maturities of 5 years or less, at face value 4.68 % 13,850 14,300 Senior notes with maturities between 5 and 10 years, at face value 3.86 % 12,049 9,630 Senior notes with maturities greater than 10 years, at face value (b) 5.19 % 28,587 23,925 Other, including capital lease obligations — 842 794 Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net — (325 ) (262 ) Total debt 4.50 % (c) 61,046 52,621 Less: Current portion 5,480 3,627 Long-term debt $ 55,566 $ 48,994 (a) The December 31, 2016 and 2015 amounts consist of ¥382 billion and ¥400 billion , respectively, of Universal Studios Japan term loans translated using the exchange rates as of these dates. (b) The December 31, 2016 and 2015 amounts include £625 million of 5.50% notes due 2029, which translated to $771 million and $921 million , respectively, using the exchange rates as of these dates. (c) Includes the effects of our derivative financial instruments.
Debt Maturities	Principal Maturities of Debt (in millions) Weighted-Average 2017 4.22 % $ 5,483 2018 4.05 % $ 4,203 2019 3.11 % $ 2,466 2020 4.18 % $ 6,217 2021 4.36 % $ 2,043 Thereafter 4.82 % $ 40,959
Debt Borrowings	2016 Debt Borrowings Year ended December 31, 2016 (in millions) Comcast 3.15% senior notes due 2026 $ 2,200 Comcast 4.05% senior notes due 2046 1,430 Comcast 2.35% senior notes due 2027 1,400 Comcast 3.40% senior notes due 2046 1,400 Comcast 2.75% senior notes due 2023 1,100 Comcast 3.20% senior notes due 2036 1,000 Comcast 1.625% senior notes due 2022 700 Other 1 Total $ 9,231
Debt Repayments and Repurchases	2016 Debt Redemptions and Repayments Year ended December 31, 2016 (in millions) NBCUniversal 2.875% senior notes due 2016 $ 1,000 Comcast 4.95% senior notes due 2016 750 NBCUniversal Enterprise senior notes due 2016 700 DreamWorks Animation assumed debt (see Note 5) 381 Other 221 Total $ 3,052
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Long-Term Debt Outstanding December 31 (in millions) Weighted-Average Interest Rate as of December 31, 2016 2016 2015 Term loans (a) 2.93 % $ 3,262 $ 3,259 Senior notes with maturities of 5 years or less, at face value 4.76 % 4,000 3,000 Senior notes with maturities between 5 and 10 years, at face value 2.88 % 1,000 3,000 Senior notes with maturities greater than 10 years, at face value 5.62 % 3,200 3,200 Other, including capital lease obligations — 138 47 Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net — (12 ) (12 ) Total debt 4.38 % (b) 11,588 12,494 Less: Current portion 127 1,163 Long-term debt $ 11,461 $ 11,331 (a) The December 31, 2016 and 2015 amounts consist of ¥382 billion and ¥400 billion , respectively, of Universal Studios Japan term loans translated using the exchange rates as of these dates. (b) Includes the effects of our derivative financial instruments.
Debt Maturities	Principal Maturities of Debt (in millions) Weighted-Average 2017 2.94 % $ 127 2018 3.15 % $ 148 2019 2.74 % $ 247 2020 3.90 % $ 4,797 2021 4.40 % $ 2,008 Thereafter 5.04 % $ 4,273

Postretirement, Pension and O40

Postretirement, Pension and Other Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement and Pension Benefits	Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 538 $ 820 $ 837 Plan funded status and recorded benefit obligation $ (538 ) $ (820 ) $ (837 ) Portion of benefit obligation not yet recognized in benefits expense $ (372 ) $ (33 ) $ 46 Benefits expense $ 70 $ 75 $ 59 Discount rate 4.07-4.56% 4.70-4.73% 4.25 %
Deferred Compensation Plans	The table below presents the benefit obligation and interest expense for our deferred compensation plans. Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 2,164 $ 2,038 $ 1,774 Interest expense $ 178 $ 171 $ 149
NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement and Pension Benefits	Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 192 $ 197 $ 209 Plan funded status and recorded benefit obligation $ (192 ) $ (197 ) $ (209 ) Portion of benefit obligation not yet recognized in benefits expense $ (42 ) $ (27 ) $ (3 ) Benefits expense $ 13 $ 15 $ 12 Discount rate 4.56 % 4.73 % 4.25 %
Deferred Compensation Plans	The table below presents the benefit obligation and interest expense for our deferred compensation plans. Year ended December 31 (in millions) 2016 2015 2014 Benefit obligation $ 494 $ 417 $ 349 Interest expense $ 48 $ 28 $ 24

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2016
Equity [Abstract]
Schedule of common stock outstanding	Shares of Common Stock Outstanding (in millions) A A Special B Balance, December 31, 2013 2,138 459 9 Stock compensation plans 13 — — Repurchases and retirements of common stock (22 ) (59 ) — Employee stock purchase plans 2 — — Balance, December 31, 2014 2,131 400 9 Stock compensation plans 12 — — Repurchases and retirements of common stock (62 ) (54 ) — Employee stock purchase plans 2 — — Reclassification of Class A Special common stock 346 (346 ) — Other 4 — — Balance, December 31, 2015 2,433 — 9 Stock compensation plans 11 — — Repurchases and retirements of common stock (81 ) — — Employee stock purchase plans 3 — — Balance, December 31, 2016 2,366 — 9
Schedule of shares repurchased	Share Repurchases Year ended December 31 (in millions) 2016 2015 2014 Cash consideration $ 5,000 $ 6,750 $ 4,251 Shares repurchased 81 116 81
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) December 31 (in millions) 2016 2015 Unrealized gains (losses) on marketable securities $ — $ 1 Deferred gains (losses) on cash flow hedges (14 ) (46 ) Unrecognized gains (losses) on employee benefit obligations 219 6 Cumulative translation adjustments (107 ) (135 ) Accumulated other comprehensive income (loss), net of deferred taxes $ 98 $ (174 )

Share-Based Compensation, Stock

Share-Based Compensation, Stock Options and Restricted Stock Units (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of recognized share-based compensation expense	The tables below provide condensed information on our share-based compensation. Recognized Share-Based Compensation Expense Year ended December 31 (in millions) 2016 2015 2014 Restricted share units $ 306 $ 273 $ 231 Stock options 173 157 160 Employee stock purchase plans 28 25 23 Total $ 507 $ 455 $ 414
Schedule of stock option and restricted share units activity	Stock Options and Restricted Share Units As of December 31, 2016, unless otherwise stated (in millions, except per share data) Stock Options RSUs Awards granted during 2016 21 8 Weighted-average exercise price of awards granted during 2016 $ 60.01 Stock options outstanding and nonvested RSUs 95 22 Weighted-average exercise price of stock options outstanding $ 42.60 Weighted-average fair value at grant date of nonvested RSUs $ 52.11
Schedule of stock option and restricted share units fair value and significant assumptions	The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under our various plans and the related weighted-average valuation assumptions. Year ended December 31 2016 2015 2014 RSUs fair value $ 60.03 $ 58.81 $ 47.91 Stock options fair value $ 11.55 $ 11.78 $ 11.11 Stock Option Valuation Assumptions: Dividend yield 1.8 % 1.7 % 1.8 % Expected volatility 23.0 % 23.0 % 24.0 % Risk-free interest rate 1.5 % 1.6 % 2.2 % Expected option life (in years) 6.1 6.0 6.5
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of recognized share-based compensation expense	The tables below provide condensed information on our share-based compensation. Recognized Share-Based Compensation Expense Year ended December 31 (in millions) 2016 2015 2014 Restricted share units $ 82 $ 78 $ 69 Stock options 9 10 16 Employee stock purchase plans 8 6 6 Total $ 99 $ 94 $ 91
Schedule of stock option and restricted share units fair value and significant assumptions	The table below presents the weighted-average fair value on the date of grant of RSUs and stock options awarded under Comcast’s various plans to employees of NBCUniversal and the related weighted-average valuation assumptions. Year ended December 31 2016 2015 2014 RSUs fair value $ 59.58 $ 59.37 $ 48.04 Stock options fair value $ 13.17 $ 11.79 $ 11.09 Stock Option Valuation Assumptions: Dividend yield 1.7 % 1.7 % 1.8 % Expected volatility 23.2 % 23.0 % 24.0 % Risk-free interest rate 1.5 % 1.6 % 2.2 % Expected option life (in years) 7.5 6.0 6.5

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Taxes [Line Items]
Schedule for the components of income tax expense	Components of Income Tax Expense Year ended December 31 (in millions) 2016 2015 2014 Current Expense (Benefit): Federal $ 3,190 $ 3,210 $ 2,392 State 480 570 174 Foreign 194 221 142 3,864 4,001 2,708 Deferred Expense (Benefit): Federal 1,192 890 1,000 State 154 66 173 Foreign 98 2 (8 ) 1,444 958 1,165 Income tax expense $ 5,308 $ 4,959 $ 3,873
Schedule of items that effect income tax expense	Our income tax expense differs from the federal statutory amount because of the effect of the items detailed in the table below. Year ended December 31 (in millions) 2016 2015 2014 Federal tax at statutory rate $ 5,024 $ 4,680 $ 4,363 State income taxes, net of federal benefit 373 326 329 Foreign income taxes, net of federal credit 65 13 — Nontaxable income attributable to noncontrolling interests (128 ) (69 ) (62 ) Adjustments to uncertain and effectively settled tax positions, net 24 15 (408 ) Accrued interest on uncertain and effectively settled tax positions, net 17 73 (235 ) Other (67 ) (79 ) (114 ) Income tax expense $ 5,308 $ 4,959 $ 3,873
Schedule of the components of net deferred tax liability	Components of Net Deferred Tax Liability December 31 (in millions) 2016 2015 Deferred Tax Assets: Net operating loss carryforwards $ 544 $ 551 Differences between book and tax basis of investments — 101 Nondeductible accruals and other 3,789 3,704 Less: Valuation allowance 266 342 4,067 4,014 Deferred Tax Liabilities: Differences between book and tax basis of property and equipment and intangible assets 37,401 36,392 Differences between book and tax basis of investments 144 — Differences between book and tax basis of indexed debt securities 375 457 Differences between book and tax basis of foreign subsidiaries and undistributed foreign earnings 960 731 38,880 37,580 Net deferred tax liability $ 34,813 $ 33,566
Reconciliation of unrecognized tax benefits	Reconciliation of Unrecognized Tax Benefits (in millions) 2016 2015 2014 Balance, January 1 $ 1,136 $ 1,171 $ 1,701 Additions based on tax positions related to the current year 74 67 63 Additions based on tax positions related to prior years 67 98 111 Additions from acquired subsidiaries 13 — — Reductions for tax positions of prior years (62 ) (84 ) (220 ) Reductions due to expiration of statutes of limitations (44 ) (41 ) (448 ) Settlements with tax authorities (81 ) (75 ) (36 ) Balance, December 31 $ 1,103 $ 1,136 $ 1,171
NBCUniversal Media LLC [Member]
Income Taxes [Line Items]
Schedule for the components of income tax expense	Components of Income Tax Expense Year ended December 31 (in millions) 2016 2015 2014 Foreign Current income tax expense $ 38 $ 81 $ 33 Deferred income tax expense 96 2 (8 ) Withholding tax expense 158 139 108 U.S. domestic tax expense 13 5 10 Income tax expense $ 305 $ 227 $ 143

Supplemental Financial Inform44

Supplemental Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Supplemental Financial Information [Line Items]
Schedule of receivables, net	Receivables December 31 (in millions) 2016 2015 Receivables, gross $ 8,622 $ 7,595 Less: Allowance for returns and customer incentives 417 473 Less: Allowance for doubtful accounts 250 226 Receivables, net $ 7,955 $ 6,896
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) December 31 (in millions) 2016 2015 Unrealized gains (losses) on marketable securities $ — $ 1 Deferred gains (losses) on cash flow hedges (14 ) (46 ) Unrecognized gains (losses) on employee benefit obligations 219 6 Cumulative translation adjustments (107 ) (135 ) Accumulated other comprehensive income (loss), net of deferred taxes $ 98 $ (174 )
Schedule of cash payments for interest and income taxes	Cash Payments for Interest and Income Taxes Year ended December 31 (in millions) 2016 2015 2014 Interest $ 2,565 $ 2,443 $ 2,389 Income taxes $ 3,693 $ 3,726 $ 3,668
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Schedule of receivables, net	Receivables December 31 (in millions) 2016 2015 Receivables, gross $ 6,799 $ 5,949 Less: Allowance for returns and customer incentives 413 469 Less: Allowance for doubtful accounts 84 69 Receivables, net $ 6,302 $ 5,411
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) December 31 (in millions) 2016 2015 Deferred gains (losses) on cash flow hedges $ 23 $ (1 ) Unrecognized gains (losses) on employee benefit obligations 14 (1 ) Cumulative translation adjustments (172 ) (210 ) Accumulated other comprehensive income (loss) $ (135 ) $ (212 )
Schedule of cash payments for interest and income taxes	Cash Payments for Interest and Income Taxes Year ended December 31 (in millions) 2016 2015 2014 Interest $ 548 $ 456 $ 485 Income taxes $ 208 $ 182 $ 174

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitment And Contingencies [Line Items]
Schedule of minimum annual programming and talent commitments	The table below summarizes our minimum annual programming and talent commitments and our minimum annual rental commitments for office space, equipment and transponder service agreements under operating leases. Programming and talent commitments include acquired film and television programming, including U.S. broadcast rights to the Olympic Games through 2032, Sunday Night Football through the 2022-23 season , Thursday Night Football through the 2017-18 season , certain NASCAR events through 2024 and other programming commitments, as well as various contracts with creative talent. As of December 31, 2016 (in millions) Programming and Talent Commitments Operating Leases 2017 $ 5,222 $ 517 2018 $ 4,879 $ 485 2019 $ 3,503 $ 433 2020 $ 4,587 $ 378 2021 $ 3,177 $ 321 Thereafter $ 20,847 $ 1,873
Schedule of rental expenses charged to operations	The table below presents our rental expense charged to operations. Year ended December 31 (in millions) 2016 2015 2014 Rental expense $ 744 $ 608 $ 580
NBCUniversal Media LLC [Member]
Commitment And Contingencies [Line Items]
Schedule of minimum annual programming and talent commitments	The table below summarizes our minimum annual programming and talent commitments and our minimum annual rental commitments for office space and equipment under operating leases. Programming and talent commitments include acquired film and television programming, including U.S. broadcast rights to the Olympic Games through 2032, Sunday Night Football through the 2022-23 season , Thursday Night Football through the 2017-18 season , certain NASCAR events through 2024 and other programming commitments, as well as various contracts with creative talent. As of December 31, 2016 (in millions) Programming and Talent Commitments Operating Leases 2017 $ 5,213 $ 198 2018 $ 4,876 $ 182 2019 $ 3,503 $ 173 2020 $ 4,587 $ 163 2021 $ 3,177 $ 147 Thereafter $ 20,847 $ 1,238
Schedule of rental expenses charged to operations	The table below presents our rental expense charged to operations. Year ended December 31 (in millions) 2016 2015 2014 Rental expense $ 259 $ 213 $ 222

Financial Data by Business Se46

Financial Data by Business Segment (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting Information [Line Items]
Financial Data by Business Segment	Our financial data by reportable business segment is presented in the tables below. We do not present a measure of total assets for our reportable business segments as this information is not used by management to allocate resources and capital. (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2016 Cable Communications (a)(b) $ 50,048 $ 20,109 $ 7,670 $ 12,439 $ 7,596 $ 1,377 NBCUniversal Cable Networks (c) 10,464 3,709 745 2,964 32 20 Broadcast Television (c) 10,147 1,320 125 1,195 153 19 Filmed Entertainment 6,360 697 47 650 33 16 Theme Parks 4,946 2,190 512 1,678 922 72 Headquarters and Other (d) 20 (699 ) 376 (1,075 ) 312 156 Eliminations (e) (344 ) 10 — 10 — — NBCUniversal 31,593 7,227 1,805 5,422 1,452 283 Corporate and Other (b) 750 (874 ) 83 (957 ) 87 26 Eliminations (e) (1,988 ) (45 ) — (45 ) — — Comcast Consolidated $ 80,403 $ 26,417 $ 9,558 $ 16,859 $ 9,135 $ 1,686 (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2015 Cable Communications (a)(b) $ 46,928 $ 19,037 $ 7,051 $ 11,986 $ 7,040 $ 1,151 NBCUniversal Cable Networks 9,628 3,499 784 2,715 44 22 Broadcast Television (c) 8,530 780 111 669 117 17 Filmed Entertainment 7,287 1,234 26 1,208 14 20 Theme Parks 3,339 1,464 292 1,172 833 54 Headquarters and Other (d) 14 (625 ) 326 (951 ) 378 98 Eliminations (e) (336 ) — — — — — NBCUniversal 28,462 6,352 1,539 4,813 1,386 211 Corporate and Other (b) 713 (815 ) 90 (905 ) 73 8 Eliminations (e) (1,593 ) 104 — 104 — — Comcast Consolidated $ 74,510 $ 24,678 $ 8,680 $ 15,998 $ 8,499 $ 1,370 (in millions) Revenue (f) Operating (g) Depreciation Operating Capital Cash Paid for Intangible Assets 2014 Cable Communications (a)(b) $ 44,165 $ 18,097 $ 6,436 $ 11,661 $ 6,156 $ 979 NBCUniversal Cable Networks (c) 9,563 3,589 748 2,841 49 21 Broadcast Television (c) 8,542 734 127 607 76 12 Filmed Entertainment 5,008 711 21 690 11 7 Theme Parks 2,623 1,096 273 823 671 15 Headquarters and Other (d) 13 (613 ) 326 (939 ) 414 75 Eliminations (e) (321 ) (1 ) — (1 ) — — NBCUniversal 25,428 5,516 1,495 4,021 1,221 130 Corporate and Other (b) 683 (763 ) 88 (851 ) 43 13 Eliminations (e) (1,501 ) 73 — 73 — — Comcast Consolidated $ 68,775 $ 22,923 $ 8,019 $ 14,904 $ 7,420 $ 1,122 (a) For the years ended December 31, 2016 , 2015 and 2014 , Cable Communications segment revenue was derived from the following sources: 2016 2015 2014 Residential: Video 44.7 % 45.9 % 47.1 % High-speed Internet 27.0 % 26.6 % 25.6 % Voice 7.1 % 7.7 % 8.3 % Business services 11.0 % 10.1 % 9.0 % Advertising 5.0 % 4.9 % 5.4 % Other 5.2 % 4.8 % 4.6 % Total 100 % 100 % 100 % Subscription revenue received from customers who purchase bundled services at a discounted rate is allocated proportionally to each service based on the individual service’s price on a stand-alone basis. For each of 2016 , 2015 and 2014 , 2.8% of Cable Communications revenue was derived from franchise and other regulatory fees. (b) Beginning in 2016, certain operations and businesses, including several strategic business initiatives, that were previously presented in Corporate and Other are now presented in our Cable Communications segment to reflect a change in our management reporting presentation. For segment reporting purposes, we have adjusted all periods presented to reflect this change. (c) The revenue and operating costs and expenses associated with our broadcast of the 2016 Rio Olympics and 2014 Sochi Olympics were reported in our Cable Networks and Broadcast Television segments. The revenue and operating costs and expenses associated with our broadcast of the 2015 Super Bowl were reported in our Broadcast Television segment. (d) NBCUniversal Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives. (e) 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 by licensing content to our Cable Networks segment (f) Revenue from customers located outside of the United States, primarily in Europe and Asia, in 2016 , 2015 and 2014 was $6.5 billion , $5.8 billion and $4.4 billion , respectively. No single customer accounted for a significant amount of revenue in any period. (g) We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses from the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash depreciation and amortization expense that results from the capital-intensive nature of certain of our businesses and from intangible assets recognized in business combinations. Additionally, it is unaffected by our capital structure or 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) attributable to Comcast Corporation, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.
Cable Communications Segment Revenue Sources	2016 2015 2014 Residential: Video 44.7 % 45.9 % 47.1 % High-speed Internet 27.0 % 26.6 % 25.6 % Voice 7.1 % 7.7 % 8.3 % Business services 11.0 % 10.1 % 9.0 % Advertising 5.0 % 4.9 % 5.4 % Other 5.2 % 4.8 % 4.6 % Total 100 % 100 % 100 %
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Financial Data by Business Segment	Our financial data by reportable business segment is presented in the tables below. We do not present a measure of total assets for our reportable business segments as this information is not used by management to allocate resources and capital. (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2016 Cable Networks (a) $ 10,464 $ 3,709 $ 745 $ 2,964 $ 32 $ 20 Broadcast Television (a) 10,147 1,320 125 1,195 153 19 Filmed Entertainment 6,360 697 47 650 33 16 Theme Parks 4,946 2,190 512 1,678 922 72 Headquarters and Other (b) 20 (699 ) 376 (1,075 ) 312 156 Eliminations (c) (344 ) 10 — 10 — — Total $ 31,593 $ 7,227 $ 1,805 $ 5,422 $ 1,452 $ 283 (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2015 Cable Networks $ 9,628 $ 3,499 $ 784 $ 2,715 $ 44 $ 22 Broadcast Television (a) 8,530 780 111 669 117 17 Filmed Entertainment 7,287 1,234 26 1,208 14 20 Theme Parks 3,339 1,464 292 1,172 833 54 Headquarters and Other (b) 14 (625 ) 326 (951 ) 378 98 Eliminations (c) (336 ) 6 — 6 — — Total $ 28,462 $ 6,358 $ 1,539 $ 4,819 $ 1,386 $ 211 (in millions) Revenue (d) Operating (e) Depreciation Operating Capital Cash Paid for Intangible Assets 2014 Cable Networks (a) $ 9,563 $ 3,589 $ 748 $ 2,841 $ 49 $ 21 Broadcast Television (a) 8,542 734 127 607 76 12 Filmed Entertainment 5,008 711 21 690 11 7 Theme Parks 2,623 1,096 273 823 671 15 Headquarters and Other (b) 13 (613 ) 326 (939 ) 414 75 Eliminations (c) (321 ) 71 — 71 — — Total $ 25,428 $ 5,588 $ 1,495 $ 4,093 $ 1,221 $ 130 (a) The revenue and operating costs and expenses associated with our broadcast of the 2016 Rio Olympics and 2014 Sochi Olympics were reported in our Cable Networks and Broadcast Television segments. The revenue and operating costs and expenses associated with our broadcast of the 2015 Super Bowl were reported in our Broadcast Television segment. (b) Headquarters and Other activities include costs associated with overhead, allocations, personnel costs and headquarter initiatives. (c) Eliminations are transactions that our segments enter into with one another, which consisted primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment. (d) We operate primarily in the United States, but also in select international markets primarily in Europe and Asia. The table below summarizes revenue by geographic location. No single customer accounted for a significant amount of revenue in any period. Year ended December 31 (in millions) 2016 2015 2014 Revenue: United States $ 25,076 $ 22,663 $ 20,995 Foreign $ 6,517 $ 5,799 $ 4,433 (e) We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses from the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash amortization expense that results from intangible assets recognized in connection with the joint venture transaction and other business combinations. Additionally, it is unaffected by our capital structure or 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) attributable to NBCUniversal, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.
Revenue From External Customers By Geographic Areas	The table below summarizes revenue by geographic location. No single customer accounted for a significant amount of revenue in any period. Year ended December 31 (in millions) 2016 2015 2014 Revenue: United States $ 25,076 $ 22,663 $ 20,995 Foreign $ 6,517 $ 5,799 $ 4,433

Quarterly Financial Informati47

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	(in millions, except per share data) First Second Third Fourth Total 2016 Revenue $ 18,790 $ 19,269 $ 21,319 $ 21,025 $ 80,403 Operating income $ 4,089 $ 4,066 $ 4,440 $ 4,264 $ 16,859 Net income attributable to Comcast Corporation (a) $ 2,134 $ 2,028 $ 2,237 $ 2,296 $ 8,695 Basic earnings per common share attributable to Comcast Corporation shareholders $ 0.88 $ 0.84 $ 0.93 $ 0.96 $ 3.61 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 0.87 $ 0.83 $ 0.92 $ 0.95 $ 3.57 Dividends declared per common share $ 0.275 $ 0.275 $ 0.275 $ 0.275 $ 1.10 2015 Revenue $ 17,853 $ 18,743 $ 18,669 $ 19,245 $ 74,510 Operating income $ 3,890 $ 4,105 $ 4,001 $ 4,002 $ 15,998 Net income attributable to Comcast Corporation $ 2,059 $ 2,137 $ 1,996 $ 1,971 $ 8,163 Basic earnings per common share attributable to Comcast Corporation shareholders $ 0.82 $ 0.85 $ 0.81 $ 0.80 $ 3.28 Diluted earnings per common share attributable to Comcast Corporation shareholders $ 0.81 $ 0.84 $ 0.80 $ 0.79 $ 3.24 Dividends declared per common share $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 1.00 (a) In the fourth quarter of 2016, net income attributable to Comcast Corporation included $225 million , $143 million net of tax, recognized in connection with the settlement of amounts owed to us under an agency agreement that had provided for, among other things, Verizon Wireless’ sale of our cable services .

Condensed Consolidating Finan48

Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Consolidating Financial Statements	Condensed Consolidating Balance Sheet December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Assets Cash and cash equivalents $ — $ — $ — $ 482 $ 2,819 $ — $ 3,301 Receivables, net — — — — 7,955 — 7,955 Programming rights — — — — 1,250 — 1,250 Deposits — — — — 1,772 — 1,772 Other current assets 151 — — 36 1,896 — 2,083 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 28 — — — — — 28 Other shareholders’ equity 53,915 120,026 114,705 38,901 207,582 (481,214 ) 53,915 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 Balance Sheet December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Assets Cash and cash equivalents $ — $ — $ — $ 414 $ 1,881 $ — $ 2,295 Receivables, net — — — — 6,896 — 6,896 Programming rights — — — — 1,213 — 1,213 Deposits — — — — 21 — 21 Other current assets 69 — — 17 1,792 — 1,878 Total current assets 69 — — 431 11,803 — 12,303 Film and television costs — — — — 5,855 — 5,855 Investments 33 — — 430 2,761 — 3,224 Investments in and amounts due from subsidiaries eliminated upon consolidation 87,142 111,241 119,354 42,441 109,598 (469,776 ) — Property and equipment, net 210 — — — 33,455 — 33,665 Franchise rights — — — — 59,364 — 59,364 Goodwill — — — — 32,945 — 32,945 Other intangible assets, net 12 — — — 16,934 — 16,946 Other noncurrent assets, net 1,301 147 — 78 2,114 (1,368 ) 2,272 Total assets $ 88,767 $ 111,388 $ 119,354 $ 43,380 $ 274,829 $ (471,144 ) $ 166,574 Liabilities and Equity Accounts payable and accrued expenses related to trade creditors $ 16 $ — $ — $ — $ 6,199 $ — $ 6,215 Accrued participations and residuals — — — — 1,572 — 1,572 Accrued expenses and other current liabilities 1,789 335 290 389 3,961 — 6,764 Current portion of long-term debt 1,149 — — 1,005 1,473 — 3,627 Total current liabilities 2,954 335 290 1,394 13,205 — 18,178 Long-term debt, less current portion 31,106 130 2,650 8,211 6,897 — 48,994 Deferred income taxes — 624 — 66 34,098 (1,222 ) 33,566 Other noncurrent liabilities 2,438 — — 1,087 7,258 (146 ) 10,637 Redeemable noncontrolling interests and redeemable subsidiary preferred stock — — — — 1,221 — 1,221 Equity: Common stock 29 — — — — — 29 Other shareholders’ equity 52,240 110,299 116,414 32,622 210,441 (469,776 ) 52,240 Total Comcast Corporation shareholders’ equity 52,269 110,299 116,414 32,622 210,441 (469,776 ) 52,269 Noncontrolling interests — — — — 1,709 — 1,709 Total equity 52,269 110,299 116,414 32,622 212,150 (469,776 ) 53,978 Total liabilities and equity $ 88,767 $ 111,388 $ 119,354 $ 43,380 $ 274,829 $ (471,144 ) $ 166,574 Condensed Consolidating Statement of Income For the Year Ended December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 80,403 $ — $ 80,403 Management fee revenue 1,067 — 1,049 — — (2,116 ) — 1,067 — 1,049 — 80,403 (2,116 ) 80,403 Costs and Expenses: Programming and production — — — — 24,463 — 24,463 Other operating and administrative 813 — 1,049 932 22,731 (2,116 ) 23,409 Advertising, marketing and promotion — — — — 6,114 — 6,114 Depreciation 28 — — — 7,436 — 7,464 Amortization 6 — — — 2,088 — 2,094 847 — 1,049 932 62,832 (2,116 ) 63,544 Operating income (loss) 220 — — (932 ) 17,571 — 16,859 Other Income (Expense): Interest expense (1,941 ) (12 ) (239 ) (456 ) (294 ) — (2,942 ) Investment income (loss), net 7 (5 ) — (25 ) 236 — 213 Equity in net income (losses) of investees, net 9,809 9,286 8,679 5,545 4,131 (37,554 ) (104 ) Other income (expense), net — — — 116 211 — 327 7,875 9,269 8,440 5,180 4,284 (37,554 ) (2,506 ) Income (loss) before income taxes 8,095 9,269 8,440 4,248 21,855 (37,554 ) 14,353 Income tax (expense) benefit 600 6 84 (13 ) (5,985 ) — (5,308 ) Net income (loss) 8,695 9,275 8,524 4,235 15,870 (37,554 ) 9,045 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (350 ) — (350 ) Net income (loss) attributable to Comcast Corporation $ 8,695 $ 9,275 $ 8,524 $ 4,235 $ 15,520 $ (37,554 ) $ 8,695 Comprehensive income (loss) attributable to Comcast Corporation $ 8,967 $ 9,317 $ 8,530 $ 4,312 $ 15,610 $ (37,769 ) $ 8,967 Condensed Consolidating Statement of Income For the Year Ended December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 74,510 $ — $ 74,510 Management fee revenue 1,005 — 977 — — (1,982 ) — 1,005 — 977 — 74,510 (1,982 ) 74,510 Costs and Expenses: Programming and production — — — — 22,550 — 22,550 Other operating and administrative 760 — 977 922 20,642 (1,982 ) 21,319 Advertising, marketing and promotion — — — — 5,963 — 5,963 Depreciation 31 — — — 6,750 — 6,781 Amortization 6 — — — 1,893 — 1,899 797 — 977 922 57,798 (1,982 ) 58,512 Operating income (loss) 208 — — (922 ) 16,712 — 15,998 Other Income (Expense): Interest expense (1,744 ) (12 ) (270 ) (462 ) (214 ) — (2,702 ) Investment income (loss), net 6 (1 ) — (19 ) 95 — 81 Equity in net income (losses) of investees, net 9,159 8,651 8,040 4,852 3,089 (34,116 ) (325 ) Other income (expense), net (3 ) — — (31 ) 354 — 320 7,418 8,638 7,770 4,340 3,324 (34,116 ) (2,626 ) Income (loss) before income taxes 7,626 8,638 7,770 3,418 20,036 (34,116 ) 13,372 Income tax (expense) benefit 537 4 94 (4 ) (5,590 ) — (4,959 ) Net income (loss) 8,163 8,642 7,864 3,414 14,446 (34,116 ) 8,413 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (250 ) — (250 ) Net income (loss) attributable to Comcast Corporation $ 8,163 $ 8,642 $ 7,864 $ 3,414 $ 14,196 $ (34,116 ) $ 8,163 Comprehensive income (loss) attributable to Comcast Corporation $ 8,135 $ 8,625 $ 7,864 $ 3,361 $ 14,192 $ (34,042 ) $ 8,135 Condensed Consolidating Statement of Income For the Year Ended December 31, 2014 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Revenue: Service revenue $ — $ — $ — $ — $ 68,775 $ — $ 68,775 Management fee revenue 947 — 921 — — (1,868 ) — 947 — 921 — 68,775 (1,868 ) 68,775 Costs and Expenses: Programming and production — — — — 20,912 — 20,912 Other operating and administrative 751 — 921 908 19,127 (1,868 ) 19,839 Advertising, marketing and promotion — — — — 5,101 — 5,101 Depreciation 34 — — — 6,303 — 6,337 Amortization 6 — — — 1,676 — 1,682 791 — 921 908 53,119 (1,868 ) 53,871 Operating income (loss) 156 — — (908 ) 15,656 — 14,904 Other Income (Expense): Interest expense (1,621 ) (11 ) (294 ) (479 ) (212 ) — (2,617 ) Investment income (loss), net 3 12 — (7 ) 288 — 296 Equity in net income (losses) of investees, net 9,330 8,843 8,350 4,523 3,212 (34,161 ) 97 Other income (expense), net — — — (4 ) (211 ) — (215 ) 7,712 8,844 8,056 4,033 3,077 (34,161 ) (2,439 ) Income (loss) before income taxes 7,868 8,844 8,056 3,125 18,733 (34,161 ) 12,465 Income tax (expense) benefit 512 — 103 (10 ) (4,478 ) — (3,873 ) Net income (loss) 8,380 8,844 8,159 3,115 14,255 (34,161 ) 8,592 Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock — — — — (212 ) — (212 ) Net income (loss) attributable to Comcast Corporation $ 8,380 $ 8,844 $ 8,159 $ 3,115 $ 14,043 $ (34,161 ) $ 8,380 Comprehensive income (loss) attributable to Comcast Corporation $ 8,178 $ 8,807 $ 8,163 $ 2,972 $ 13,980 $ (33,922 ) $ 8,178 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2016 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (1,332 ) $ (189 ) $ (100 ) $ (1,453 ) $ 22,314 $ — $ 19,240 Investing Activities: Net transactions with affiliates (860 ) 189 100 2,642 (2,071 ) — — Capital expenditures (13 ) — — — (9,122 ) — (9,135 ) Cash paid for intangible assets (9 ) — — — (1,677 ) — (1,686 ) Acquisitions and construction of real estate properties (35 ) — — — (393 ) — (428 ) Acquisitions, net of cash acquired — — — — (3,929 ) — (3,929 ) Proceeds from sales of businesses and investments — — — 104 114 — 218 Purchases of investments (40 ) — — (210 ) (1,447 ) — (1,697 ) Deposits — — — — (1,749 ) — (1,749 ) Other (108 ) — — (35 ) 164 — 21 Net cash provided by (used in) investing activities (1,065 ) 189 100 2,501 (20,110 ) — (18,385 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net 1,339 — — — 451 — 1,790 Proceeds from borrowings 9,231 — — — — — 9,231 Repurchases and repayments of debt (750 ) — — (1,005 ) (1,297 ) — (3,052 ) Repurchases and retirements of common stock (5,000 ) — — — — — (5,000 ) Dividends paid (2,601 ) — — — — — (2,601 ) Issuances of common stock 23 — — — — — 23 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (253 ) — (253 ) Other 155 — — 25 (167 ) — 13 Net cash provided by (used in) financing activities 2,397 — — (980 ) (1,266 ) — 151 Increase (decrease) in cash and cash equivalents — — — 68 938 — 1,006 Cash and cash equivalents, beginning of year — — — 414 1,881 — 2,295 Cash and cash equivalents, end of year $ — $ — $ — $ 482 $ 2,819 $ — $ 3,301 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2015 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (792 ) $ 48 $ (167 ) $ (1,398 ) $ 21,087 $ — $ 18,778 Investing Activities: Net transactions with affiliates 6,559 (48 ) 840 2,839 (10,190 ) — — Capital expenditures (27 ) — — — (8,472 ) — (8,499 ) Cash paid for intangible assets (6 ) — — — (1,364 ) — (1,370 ) Acquisitions and construction of real estate properties — — — — (178 ) — (178 ) Acquisitions, net of cash acquired — — — — (1,786 ) — (1,786 ) Proceeds from sales of businesses and investments — — — 4 429 — 433 Purchases of investments (7 ) — — (407 ) (370 ) — (784 ) Deposits — — — — (18 ) — (18 ) Other 7 — — (5 ) 236 — 238 Net cash provided by (used in) investing activities 6,526 (48 ) 840 2,431 (21,713 ) — (11,964 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net 400 — — — (265 ) — 135 Proceeds from borrowings 5,486 — — — — — 5,486 Repurchases and repayments of debt (2,650 ) — (673 ) (1,004 ) (51 ) — (4,378 ) Repurchases and retirements of common stock (6,750 ) — — — — — (6,750 ) Dividends paid (2,437 ) — — — — — (2,437 ) Issuances of common stock 36 — — — — — 36 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (232 ) — (232 ) Other 181 — — — (470 ) — (289 ) Net cash provided by (used in) financing activities (5,734 ) — (673 ) (1,004 ) (1,018 ) — (8,429 ) Increase (decrease) in cash and cash equivalents — — — 29 (1,644 ) — (1,615 ) Cash and cash equivalents, beginning of year — — — 385 3,525 — 3,910 Cash and cash equivalents, end of year $ — $ — $ — $ 414 $ 1,881 $ — $ 2,295 Condensed Consolidating Statement of Cash Flows For the Year Ended December 31, 2014 (in millions) Comcast Comcast CCCL NBCUniversal Non- Elimination Consolidated Net cash provided by (used in) operating activities $ (354 ) $ 9 $ (139 ) $ (1,299 ) $ 18,728 $ — $ 16,945 Investing Activities: Net transactions with affiliates 4,784 (9 ) 139 2,247 (7,161 ) — — Capital expenditures (3 ) — — — (7,417 ) — (7,420 ) Cash paid for intangible assets (6 ) — — — (1,116 ) — (1,122 ) Acquisitions and construction of real estate properties — — — — (43 ) — (43 ) Acquisitions, net of cash acquired — — — — (477 ) — (477 ) Proceeds from sales of businesses and investments — — — 8 658 — 666 Purchases of investments (19 ) — — (10 ) (162 ) — (191 ) Deposits — — — — — — — Other — — — 5 (151 ) — (146 ) Net cash provided by (used in) investing activities 4,756 (9 ) 139 2,250 (15,869 ) — (8,733 ) Financing Activities: Proceeds from (repayments of) short-term borrowings, net (1,350 ) — — — 846 — (504 ) Proceeds from borrowings 4,180 — — — 2 — 4,182 Repurchases and repayments of debt (1,000 ) — — (902 ) (1,273 ) — (3,175 ) Repurchases and retirements of common stock (4,251 ) — — — — — (4,251 ) Dividends paid (2,254 ) — — — — — (2,254 ) Issuances of common stock 35 — — — — — 35 Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock — — — — (220 ) — (220 ) Other 238 — — — (71 ) — 167 Net cash provided by (used in) financing activities (4,402 ) — — (902 ) (716 ) — (6,020 ) Increase (decrease) in cash and cash equivalents — — — 49 2,143 — 2,192 Cash and cash equivalents, beginning of year — — — 336 1,382 — 1,718 Cash and cash equivalents, end of year $ — $ — $ — $ 385 $ 3,525 $ — $ 3,910

Business and Basis of Present49

Business and Basis of Presentation (Details) customer in Millions	Jan. 24, 2017	Dec. 31, 2016customersegment	Nov. 30, 2015
Business And Basis Of Presentation [Line Items]
Number of reportable segments | segment		5
NBCUniversal Media LLC [Member]
Business And Basis Of Presentation [Line Items]
Number of reportable segments | segment		4
Cable Communications [Member]
Business And Basis Of Presentation [Line Items]
Number of reportable segments | segment		1
Total customer relationships | customer		28.6
NBCUniversal [Member]
Business And Basis Of Presentation [Line Items]
Number of reportable segments | segment		4
Video Customers [Member] | Cable Communications [Member]
Business And Basis Of Presentation [Line Items]
Number of customers | customer		22.5
High-speed Internet Customers [Member] | Cable Communications [Member]
Business And Basis Of Presentation [Line Items]
Number of customers | customer		24.7
Voice Customers [Member] | Cable Communications [Member]
Business And Basis Of Presentation [Line Items]
Number of customers | customer		11.7
Universal Studios Japan [Member] | Theme Parks [Member]
Business And Basis Of Presentation [Line Items]
Ownership percentage			51.00%
Universal Studios Japan [Member] | Theme Parks [Member] | NBCUniversal Media LLC [Member]
Business And Basis Of Presentation [Line Items]
Ownership percentage			51.00%
Subsequent Event [Member]
Business And Basis Of Presentation [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio	2

Recent Accounting Pronounceme50

Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 19,240	$ 18,778	$ 16,945
Net cash provided by (used in) financing activities	151	(8,429)	(6,020)
Share Based Compensation New Accounting Pronouncement [Member] | As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	19,240	18,778	16,945
Net cash provided by (used in) financing activities	151	(8,429)	(6,020)
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	$ 233
Decrease in effective income tax rate	1.60%
Increase in diluted earnings per share (in dollars per share)	$ 0.08
Net cash provided by operating activities	$ 585	708	652
Net cash provided by (used in) financing activities	(585)	(708)	(652)
Share Based Compensation New Accounting Pronouncement [Member] | Upon Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	19,825	19,486	17,597
Net cash provided by (used in) financing activities	$ (434)	$ (9,137)	$ (6,672)

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to Parent	$ 2,296	$ 2,237	$ 2,028	$ 2,134	$ 1,971	$ 1,996	$ 2,137	$ 2,059	$ 8,695	$ 8,163	$ 8,380
Basic EPS attributable to Comcast Corporation shareholders (in shares)									2,410	2,486	2,583
Assumed exercise or issuance of shares relating to stock plans (in shares)									28	32	37
Diluted EPS attributable to Comcast Corporation shareholders (in shares)									2,438	2,518	2,620
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.96	$ 0.93	$ 0.84	$ 0.88	$ 0.80	$ 0.81	$ 0.85	$ 0.82	$ 3.61	$ 3.28	$ 3.24
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.95	$ 0.92	$ 0.83	$ 0.87	$ 0.79	$ 0.80	$ 0.84	$ 0.81	$ 3.57	$ 3.24	$ 3.20

Significant Transactions (Narra

Significant Transactions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 22, 2016	Nov. 13, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Contribution from member			$ 3,655	$ 252
DreamWorks Animation [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,773
Business acquisition share price (in dollars per share)	$ 41
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,773
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member] | Member's contribution that represented Deferred Income Tax Assets and Other Tax-related Items recorded by Parent but excluded from net assets contributed
Business Acquisition [Line Items]
Contribution from member	353
Universal Studios Japan [Member]
Business Acquisition [Line Items]
Cash consideration transferred		$ 1,499
Ownership percentage		51.00%
Ownership percentage by noncontrolling owners		49.00%
Universal Studios Japan [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Cash consideration transferred		$ 1,499
Ownership percentage		51.00%
Ownership percentage by noncontrolling owners		49.00%
Time Warner Cable Merger and Related Divestiture Transactions [Member]
Business Acquisition [Line Items]
Transaction costs and transaction-related costs				198	$ 237
Write-off of assets related to merger agreement termination				$ 20
Tax Receivable Agreement [Member] | DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Contribution from member	146
Cash Consideration Transferred By Comcast [Member] | DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Cash consideration transferred	$ 3,800
Business acquisition share price (in dollars per share)	$ 41

Significant Transactions (Preli

Significant Transactions (Preliminary Allocation of Purchase Price) (Details) - USD ($) $ in Millions	Aug. 22, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 35,980	$ 32,945	$ 27,316
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Goodwill		$ 23,323	$ 20,364	$ 14,908
DreamWorks Animation [Member]
Business Acquisition [Line Items]
Film and television costs (see Note 6)	$ 854
Intangible assets (see Note 9)	164
Working capital	248
Debt (see Note 10)	(381)
Tax receivable agreement	(146)
Deferred income taxes (see Note 14)	366
Other noncurrent assets and liabilities and other	137
Identifiable net assets (liabilities) acquired	1,242
Noncontrolling interest	(89)
Goodwill	2,620
Cash consideration transferred by Comcast	3,773
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Film and television costs (see Note 6)	854
Intangible assets (see Note 9)	164
Working capital	248
Debt (see Note 10)	(381)
Tax receivable agreement	(146)
Other noncurrent assets and liabilities and other	503
Identifiable net assets (liabilities) acquired	1,242
Noncontrolling interest	(89)
Goodwill	2,620
Cash consideration transferred by Comcast	$ 3,773

Significant Transactions (Alloc

Significant Transactions (Allocation of Purchase Price) (Details) - USD ($) $ in Millions	Nov. 13, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 35,980	$ 32,945	$ 27,316
NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Goodwill		$ 23,323	$ 20,364	$ 14,908
Universal Studios Japan [Member]
Business Acquisition [Line Items]
Property and equipment (see Note 8)	$ 780
Intangible assets (see Note 9)	323
Working capital	(33)
Debt (see Note 10)	(3,271)
Other noncurrent assets and liabilities and other	17
Identifiable net assets (liabilities) acquired	(2,184)
Noncontrolling interest	(1,440)
Goodwill	5,123
Cash consideration transferred	1,499
Universal Studios Japan [Member] | NBCUniversal Media LLC [Member]
Business Acquisition [Line Items]
Property and equipment (see Note 8)	780
Intangible assets (see Note 9)	323
Working capital	(33)
Debt (see Note 10)	(3,271)
Other noncurrent assets and liabilities and other	17
Identifiable net assets (liabilities) acquired	(2,184)
Noncontrolling interest	(1,440)
Goodwill	5,123
Cash consideration transferred	$ 1,499

Significant Transactions (Pro F

Significant Transactions (Pro Forma Information) (Details) - Universal Studios Japan [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Revenue		$ 75,563	$ 69,860
Net income		8,591	8,704
Net income attributable to parent company		$ 8,253	$ 8,435
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)		$ 3.32	$ 3.27
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)		$ 3.28	$ 3.22
Revenue of Acquiree Since Acquisition Date	$ 1,400	$ 169
Net income of Acquiree Since Acquisition Date	124	18
NBC Universal Media LLC [Member]
Business Acquisition [Line Items]
Revenue		29,514	$ 26,513
Net income		3,801	3,409
Net income attributable to parent company		3,503	$ 3,170
Revenue of Acquiree Since Acquisition Date	1,400	169
Net income of Acquiree Since Acquisition Date	$ 124	$ 18

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Other noncurrent liabilities	$ 10,925		$ 10,637
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Other noncurrent liabilities	4,130		3,790
NBCUniversal Media LLC [Member] | Carrying Value Of Related Party Contractual Obligation [Member]
Related Party Transaction [Line Items]
Other noncurrent liabilities	$ 383		$ 383
NBCUniversal Media LLC [Member] | NBCUniversal Holdings Preferred Stock [Member]
Related Party Transaction [Line Items]
Preferred stock, dividend rate	8.25%
Preferred stock liquidation preference value	$ 9,400
NBCUniversal Media LLC [Member] | Former Comcast And NBCUniversal Revolving Credit Agreements [Member]
Related Party Transaction [Line Items]
Revolving credit agreement capacity		$ 3,000
NBCUniversal Media LLC [Member] | Comcast and NBCUniversal Revolving Credit Agreements [Member]
Related Party Transaction [Line Items]
Revolving credit agreement capacity		$ 5,000
Borrowing margin for LIBOR based borrowings	1.00%

Related Party Transactions (Con

Related Party Transactions (Condensed Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Receivables, net	$ 7,955	$ 6,896
Accounts payable and accrued expenses related to trade creditors	6,915	6,215
Accrued expenses and other current liabilities	6,282	5,462
Other noncurrent liabilities	10,925	10,637
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	6,302	5,411
Accounts payable and accrued expenses related to trade creditors	1,647	1,564
Accrued expenses and other current liabilities	1,888	1,675
Other noncurrent liabilities	4,130	3,790
Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Receivables, net	285	239
Accounts payable and accrued expenses related to trade creditors	55	68
Accrued expenses and other current liabilities	4	51
Note payable to Comcast	2,703	1,750
Other noncurrent liabilities	$ 389	$ 383

Related Party Transactions (C58

Related Party Transactions (Condensed Consolidated Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Revenue	$ 21,025	$ 21,319	$ 19,269	$ 18,790	$ 19,245	$ 18,669	$ 18,743	$ 17,853	$ 80,403	$ 74,510	$ 68,775
NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue									31,593	28,462	25,428
Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media LLC [Member]
Related Party Transaction [Line Items]
Revenue									1,742	1,349	1,315
Operating costs and expenses									(220)	(246)	(162)
Other income (expense)									$ (69)	$ (37)	$ (43)

Film and Television Costs (Sche

Film and Television Costs (Schedule) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Film Costs:
Released, less amortization	$ 1,750	$ 1,275
Completed, not released	50	226
In production and in development	1,310	907
Total film costs	3,110	2,408
Television Costs:
Released, less amortization	1,953	1,573
In production and in development	853	737
Total television costs	2,806	2,310
Programming rights, less amortization	2,586	2,350
Total film costs, television costs and programming rights	8,502	7,068
Less: Current portion of programming rights	1,250	1,213
Film and television costs	7,252	5,855
NBCUniversal Media LLC [Member]
Film Costs:
Released, less amortization	1,750	1,275
Completed, not released	50	226
In production and in development	1,310	907
Total film costs	3,110	2,408
Television Costs:
Released, less amortization	1,953	1,573
In production and in development	853	737
Total television costs	2,806	2,310
Programming rights, less amortization	2,570	2,329
Total film costs, television costs and programming rights	8,486	7,047
Less: Current portion of programming rights	1,241	1,200
Film and television costs	$ 7,245	$ 5,847

Film and Television Costs (Narr

Film and Television Costs (Narrative)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Film And Television Cost [Line Items]
Amortization of completed film and television production expected to be amortized during the next fiscal year	$ 1,900
Expected amortization percentage of released and unamortized film and television costs during the next three fiscal years	88.00%
Remaining unamortized costs of acquired film and television libraries	$ 596
Expected amortization percentage of unamortized acquired film and television library costs during the next three fiscal years	45.00%
Maximum [Member]
Film And Television Cost [Line Items]
Amortization period of acquired film and television library costs	20 years
NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Amortization of completed film and television production expected to be amortized during the next fiscal year	$ 1,900
Expected amortization percentage of released and unamortized film and television costs during the next three fiscal years	88.00%
Remaining unamortized costs of acquired film and television libraries	$ 596
Expected amortization percentage of unamortized acquired film and television library costs during the next three fiscal years	45.00%
NBCUniversal Media LLC [Member] | Maximum [Member]
Film And Television Cost [Line Items]
Amortization period of acquired film and television library costs	20 years
Adjustments To Capitalized Film And Stage Play Production Costs [Member]
Film And Television Cost [Line Items]
Adjustments to capitalized film and stage play production costs	$ 14	$ 42	$ 26
Adjustments To Capitalized Film And Stage Play Production Costs [Member] | NBCUniversal Media LLC [Member]
Film And Television Cost [Line Items]
Adjustments to capitalized film and stage play production costs	$ 14	$ 42	$ 26

Investments (Schedule of Invest

Investments (Schedule of Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Equity And Cost Method Investments [Line Items]
Fair Value Method	$ 198	$ 167
Equity method	2,376	678
Cost method	2,770	2,485
Total Investments	5,344	3,330
Less: Current investments	97	106
Noncurrent investments	5,247	3,224
Atairos [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	1,601	0
Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	225	184
Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	550	494
Air Touch [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	1,599	1,583
BuzzFeed [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	400	200
Other Cost Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	771	702
NBCUniversal Media LLC [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Fair Value Method	6	10
Equity method	561	497
Cost method	696	458
Noncurrent investments	1,263	965
NBCUniversal Media LLC [Member] | Hulu [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	225	184
NBCUniversal Media LLC [Member] | Other Equity Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Equity method	336	313
NBCUniversal Media LLC [Member] | BuzzFeed [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	400	200
NBCUniversal Media LLC [Member] | Other Cost Method Investments [Member]
Fair Value, Equity And Cost Method Investments [Line Items]
Cost method	$ 296	$ 258

Investments (Investment Income

Investments (Investment Income (Loss), Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Gains on sales and exchanges of investments, net	$ 46	$ 12	$ 192
Investment impairment losses	(34)	(59)	(50)
Unrealized gains (losses) on securities underlying prepaid forward sale agreements	0	42	66
Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments	(4)	(42)	(56)
Interest and dividend income	123	115	116
Other, net	82	13	28
Investment income (loss), net	$ 213	$ 81	$ 296

Investments (Equity Method Inve

Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Aug. 31, 2016	Jan. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity in net losses of investees			$ 104	$ 325	$ (97)
NBCUniversal Media LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity in net losses of investees			$ 99	376	(46)
Atairos [Member]
Schedule of Equity Method Investments [Line Items]
Term of agreement			12 years
Funding commitment			$ 4,000
Management fee funding commitment			$ 40
Percent of losses			99.00%
Percentage of residual returns			86.50%
Purchases of investments			$ 1,200
Capital Contribution to VIE accrued but not yet paid			447
Atairos [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Funding commitment by management company investors			100
Atairos [Member] | Former CFO [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Funding commitment by management company investors			40
Hulu [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	30.00%					33.00%
Put/Call Period	3 years
Deferred gain	$ 159
Equity in net losses of investees			168	106	20
Hulu [Member] | NBCUniversal Media LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	30.00%					33.00%
Put/Call Period	3 years
Deferred gain	$ 159
Equity in net losses of investees			$ 168	106	$ 20
The Weather Channel [Member]
Schedule of Equity Method Investments [Line Items]
Pretax gain on sale of investment		$ 108
Goodwill impairment loss from equity method investments				333
The Weather Channel [Member] | NBCUniversal Media LLC [Member]
Schedule of Equity Method Investments [Line Items]
Pretax gain on sale of investment		$ 108
Goodwill impairment loss from equity method investments				$ 333
Time Warner, Inc. [Member] | Hulu [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%
Time Warner, Inc. [Member] | Hulu [Member] | NBCUniversal Media LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.00%

Investments (Equity Method In64

Investments (Equity Method Investments Summarized Financial Information) (Details) - NBCUniversal Media LLC [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Current assets	$ 2,105	$ 1,904
Noncurrent assets	2,724	3,584
Current liabilities	1,921	1,225
Noncurrent liabilities	2,853	4,879
Revenue	4,285	3,944	$ 3,756
Operating income (loss)	(182)	(1,609)	483
Net income (loss)	$ (313)	$ (1,820)	$ 243

Investments (Cost Method Invest

Investments (Cost Method Investments) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)preferred_stock_series	Nov. 30, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)
BuzzFeed [Member]
Schedule of Cost-method Investments [Line Items]
Purchases of investments		$ 200		$ 200
Air Touch [Member]
Schedule of Cost-method Investments [Line Items]
Number of preferred stock series | preferred_stock_series	2
Preferred stock aggregate redemption value	$ 1,650
NBCUniversal Media LLC [Member] | Vox Media [Member]
Schedule of Cost-method Investments [Line Items]
Purchases of investments				200
NBCUniversal Media LLC [Member] | BuzzFeed [Member]
Schedule of Cost-method Investments [Line Items]
Purchases of investments		$ 200		$ 200
Air Touch [Member]
Schedule of Cost-method Investments [Line Items]
Number of preferred stock series | preferred_stock_series	3
Preferred stock aggregate redemption value	$ 1,750
Redeemable subsidiary preferred shares	1,600		$ 1,600
Nonredeemable subsidiary preferred shares	100		100
Level 2 [Member] | Air Touch [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of cost method Investment redeemable preferred shares	1,700		1,700
Level 2 [Member] | Air Touch [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of redeemable preferred shares	$ 1,700		$ 1,700

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 85,947	$ 81,765
Less: Accumulated depreciation	49,694	48,100
Property and equipment, net	36,253	33,665
NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	13,861	12,300
Less: Accumulated depreciation	3,350	2,779
Property and equipment, net	$ 10,511	9,521
Cable Distribution System [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	11 years
Property and equipment, at cost	$ 34,028	32,586
Customer Premise Equipment [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	6 years
Property and equipment, at cost	$ 28,621	28,559
Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	8 years
Property and equipment, at cost	$ 9,475	8,539
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	29 years
Property and equipment, at cost	$ 12,550	10,829
Building and Leasehold Improvements [Member] | NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	30 years
Property and equipment, at cost	$ 7,543	6,543
Furniture, Fixtures and Equipment [Member] | NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Weighted-Average Original Useful Life	11 years
Property and equipment, at cost	$ 4,158	3,457
Construction in Process [Member] | NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	1,176	1,339
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	1,273	1,252
Land [Member] | NBCUniversal Media LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 984	$ 961

Goodwill and Intangible Asset67

Goodwill and Intangible Assets (Schedule of Change in Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Balance, beginning of period	$ 32,945	$ 27,316
Acquisitions	3,032	5,661
Adjustments	(257)	(1)
Foreign currency translation	(260)	31
Balance, end of period	35,980	32,945
NBCUniversal Media LLC [Member]
Goodwill [Roll Forward]
Balance, beginning of period	20,364	14,908
Acquisitions	2,949	5,487
Adjustments	(250)
Foreign currency translation	(260)	31
Balance, end of period	23,323	20,364
Operating Segments [Member] | Cable Communications [Member]
Goodwill [Roll Forward]
Balance, beginning of period	12,389	12,217
Acquisitions	82	173
Adjustments	174	(1)
Foreign currency translation	0	0
Balance, end of period	12,645	12,389
Operating Segments [Member] | Cable Networks [Member]
Goodwill [Roll Forward]
Balance, beginning of period	12,947	12,948
Acquisitions	232	17
Adjustments	0	0
Foreign currency translation	(4)	18
Balance, end of period	13,183	12,947
Operating Segments [Member] | Cable Networks [Member] | NBCUniversal Media LLC [Member]
Goodwill [Roll Forward]
Balance, beginning of period	12,947	12,948
Acquisitions	232	17
Adjustments	0
Foreign currency translation	(4)	18
Balance, end of period	13,183	12,947
Operating Segments [Member] | Broadcast Television [Member]
Goodwill [Roll Forward]
Balance, beginning of period	806	767
Acquisitions	0	39
Adjustments	0	0
Foreign currency translation	0	0
Balance, end of period	806	806
Operating Segments [Member] | Broadcast Television [Member] | NBCUniversal Media LLC [Member]
Goodwill [Roll Forward]
Balance, beginning of period	806	767
Acquisitions	0	39
Adjustments	0
Foreign currency translation	0	0
Balance, end of period	806	806
Operating Segments [Member] | Filmed Entertainment [Member]
Goodwill [Roll Forward]
Balance, beginning of period	267	211
Acquisitions	2,717	58
Adjustments	0	0
Foreign currency translation	(9)	2
Balance, end of period	2,993	267
Operating Segments [Member] | Filmed Entertainment [Member] | NBCUniversal Media LLC [Member]
Goodwill [Roll Forward]
Balance, beginning of period	267	211
Acquisitions	2,717	58
Adjustments	0
Foreign currency translation	(9)	2
Balance, end of period	2,993	267
Operating Segments [Member] | Theme Parks [Member]
Goodwill [Roll Forward]
Balance, beginning of period	6,344	982
Acquisitions	0	5,373
Adjustments	(250)	0
Foreign currency translation	(247)	11
Balance, end of period	6,341	6,344
Operating Segments [Member] | Theme Parks [Member] | NBCUniversal Media LLC [Member]
Goodwill [Roll Forward]
Balance, beginning of period	6,344	982
Acquisitions	0	5,373
Adjustments	(250)
Foreign currency translation	(247)	11
Balance, end of period	6,341	6,344
Corporate, Non-Segment [Member]
Goodwill [Roll Forward]
Balance, beginning of period	192	191
Acquisitions	1	1
Adjustments	(181)	0
Foreign currency translation	0	0
Balance, end of period	$ 12	$ 192

Goodwill and Intangible Asset68

Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule of Indefinite and Finite-Lived Intangible Assets [Line Items]
Total	$ 87,651	$ 86,178
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (11,013)	(9,868)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	19 years
Gross Carrying Amount	$ 13,478	13,396
Accumulated Amortization	$ (5,110)	(4,442)
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	4 years
Gross Carrying Amount	$ 7,017	6,008
Accumulated Amortization	$ (3,997)	(3,429)
Cable franchise renewal costs and contractual operating rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	9 years
Gross Carrying Amount	$ 1,460	1,499
Accumulated Amortization	$ (800)	(849)
Patents and other technology rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	7 years
Gross Carrying Amount	$ 257	409
Accumulated Amortization	$ (208)	(350)
Other agreements and rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	15 years
Gross Carrying Amount	$ 2,443	1,994
Accumulated Amortization	(898)	(798)
Franchise Rights [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	59,364	59,364
Trade Names [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	2,981	2,857
FCC Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	651	651
NBCUniversal Media LLC [Member]
Schedule of Indefinite and Finite-Lived Intangible Assets [Line Items]
Total	20,345	19,460
Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (6,568)	(5,654)
NBCUniversal Media LLC [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	19 years
Gross Carrying Amount	$ 13,173	13,107
Accumulated Amortization	$ (4,952)	(4,291)
NBCUniversal Media LLC [Member] | Software [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	5 years
Gross Carrying Amount	$ 1,195	849
Accumulated Amortization	$ (563)	(431)
NBCUniversal Media LLC [Member] | Other agreements and rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Original Useful Life	15 years
Gross Carrying Amount	$ 2,345	1,996
Accumulated Amortization	(1,053)	(932)
NBCUniversal Media LLC [Member] | Trade Names [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	2,981	2,857
NBCUniversal Media LLC [Member] | FCC Licenses [Member]
Indefinite-lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 651	$ 651

Goodwill and Intangible Asset69

Goodwill and Intangible Assets (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016divisionsegment
Segment Reporting Information [Line Items]
Number of reportable segments	5
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	4
Cable Communications [Member]
Segment Reporting Information [Line Items]
Number of reportable segments	1
Cable Communications [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Number of divisions | division	3
Software [Member]
Segment Reporting Information [Line Items]
Finite-lived intangible asset amortization period	4 years
Software [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Finite-lived intangible asset amortization period	5 years
Software [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Finite-lived intangible asset amortization period	5 years
Software [Member] | NBCUniversal Media LLC [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Finite-lived intangible asset amortization period	5 years

Goodwill and Intangible Asset70

Goodwill and Intangible Assets (Amortization of Intangible Assets) (Details) $ in Millions	Dec. 31, 2016USD ($)
Estimated Amortization Expense of Finite-Lived Intangible Assets
2,017	$ 2,077
2,018	1,828
2,019	1,475
2,020	1,168
2,021	939
NBCUniversal Media LLC [Member]
Estimated Amortization Expense of Finite-Lived Intangible Assets
2,017	946
2,018	929
2,019	900
2,020	873
2,021	$ 804

Long-Term Debt (Schedule of Deb

Long-Term Debt (Schedule of Debt Outstanding) (Details) £ in Millions, $ in Millions, ¥ in Billions	Dec. 31, 2016USD ($)	Dec. 31, 2016JPY (¥)	Dec. 31, 2016GBP (£)	Dec. 31, 2015USD ($)	Dec. 31, 2015JPY (¥)	Dec. 31, 2015GBP (£)
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.50%	4.50%	4.50%
Commercial paper	$ 2,781			$ 975
Revolving bank credit facilities	0			0
Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net	(325)			(262)
Total debt	61,046			52,621
Less: Current portion	5,480			3,627
Long-term debt	$ 55,566			48,994
Commercial Paper [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	1.01%	1.01%	1.01%
Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	2.93%	2.93%	2.93%
Term loans	$ 3,262	¥ 382		3,259	¥ 400
Senior notes with maturities of 5 years or less, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.68%	4.68%	4.68%
Senior notes	$ 13,850			14,300
Senior notes with maturities between 5 and 10 years, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	3.86%	3.86%	3.86%
Senior notes	$ 12,049			9,630
Senior notes with maturities greater than 10 years, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	5.19%	5.19%	5.19%
Senior notes	$ 28,587			23,925
Other Including Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Other, including capital lease obligations	842			794
Notes 5.50% Due 2029 [Member]
Debt Instrument [Line Items]
Senior notes	$ 771		£ 625	$ 921		£ 625
Interest rate	5.50%	5.50%	5.50%	5.50%	5.50%	5.50%
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.38%	4.38%	4.38%
Debt issuance costs, premiums, discounts and fair value adjustments for hedged positions, net	$ (12)			$ (12)
Total debt	11,588			12,494
Less: Current portion	127			1,163
Long-term debt	$ 11,461			11,331
NBCUniversal Media LLC [Member] | Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	2.93%	2.93%	2.93%
Term loans	$ 3,262	¥ 382		3,259	¥ 400
NBCUniversal Media LLC [Member] | Senior notes with maturities of 5 years or less, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	4.76%	4.76%	4.76%
Senior notes	$ 4,000			3,000
NBCUniversal Media LLC [Member] | Senior notes with maturities between 5 and 10 years, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	2.88%	2.88%	2.88%
Senior notes	$ 1,000			3,000
NBCUniversal Media LLC [Member] | Senior notes with maturities greater than 10 years, at face value [Member]
Debt Instrument [Line Items]
Weighted-Average Interest Rate	5.62%	5.62%	5.62%
Senior notes	$ 3,200			3,200
NBCUniversal Media LLC [Member] | Other Including Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Other, including capital lease obligations	$ 138			$ 47

Long-Term Debt (Debt Maturities

Long-Term Debt (Debt Maturities) (Details) $ in Millions	Dec. 31, 2016USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2,017	$ 5,483
2,018	4,203
2,019	2,466
2,020	6,217
2,021	2,043
Thereafter	$ 40,959
Long-term Debt, Weighted-average Interest Rate, Fiscal Year Maturity [Abstract]
2,017	4.22%
2,018	4.05%
2,019	3.11%
2,020	4.18%
2,021	4.36%
Thereafter	4.82%
NBCUniversal Media LLC [Member]
Long-term Debt, Fiscal Year Maturity [Abstract]
2,017	$ 127
2,018	148
2,019	247
2,020	4,797
2,021	2,008
Thereafter	$ 4,273
Long-term Debt, Weighted-average Interest Rate, Fiscal Year Maturity [Abstract]
2,017	2.94%
2,018	3.15%
2,019	2.74%
2,020	3.90%
2,021	4.40%
Thereafter	5.04%

Long-Term Debt (Debt Borrowings

Long-Term Debt (Debt Borrowings) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Proceeds from borrowings	$ 9,231	$ 5,486	$ 4,182
Senior 3.15% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 2,200
Interest rate	3.15%
Senior 4.05% Notes Due 2046 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,430
Interest rate	4.05%
Senior 2.35% Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,400
Interest rate	2.35%
Senior 3.40% Notes Due 2046 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,400
Interest rate	3.40%
Senior 2.75% Notes Due 2023 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,100
Interest rate	2.75%
Senior 3.20% Notes Due 2036 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 1,000
Interest rate	3.20%
Senior 1.625% Notes Due 2022 [Member]
Debt Instrument [Line Items]
Debt face amount	$ 700
Interest rate	1.625%
Other Borrowings [Member]
Debt Instrument [Line Items]
Other Borrowings	$ 1

Long-Term Debt (Debt Repayments

Long-Term Debt (Debt Repayments) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 3,052	$ 4,378	$ 3,175
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		1,565	$ 1,022	$ 906
Senior 2.875% Notes Due 2016 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 1,000
Interest rate		2.875%
Senior 2.875% Notes Due 2016 [Member] | NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt	$ 1,000
Interest rate	2.875%
Senior 4.95% Notes Due 2016 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 750
Interest rate		4.95%
NBCUniversal Enterprise Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		$ 700
DreamWorks Assumed Debt [Member]
Debt Instrument [Line Items]
Repayments of Assumed Debt		381
Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Repurchases and repayments of debt		221
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Repayments of Assumed Debt		$ 381

Long-Term Debt (Narrative) (Det

Long-Term Debt (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	May 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Fair value of debt	$ 66,300,000,000		$ 58,000,000,000
Amounts available under revolving credit facilities	5,500,000,000
Unused irrevocable standby letters of credit	$ 443,000,000
NBCUniversal Enterprise Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,500,000,000
Potential increase of maximum borrowing capacity		2,000,000,000
Borrowing margin for LIBOR based borrowings	1.00%
Amounts available under revolving credit facilities	$ 460,000,000
Former Comcast And Comcast Cable Communications, LLC Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		6,250,000,000
Former NBCUniversal Enterprise Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		1,350,000,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper capacity	6,250,000,000
NBCUniversal Enterprise Commercial Paper [Member]
Debt Instrument [Line Items]
Commercial paper capacity	1,350,000,000
Comcast Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		7,000,000,000
Potential increase of maximum borrowing capacity		$ 10,000,000,000
NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Fair value of debt	$ 12,600,000,000		$ 13,400,000,000
Ownership in cable holding company subsidiaries	100.00%
NBCUniversal Media LLC [Member] | Comcast And Comcast Cable Debt Securities [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	$ 44,700,000,000
NBCUniversal Media LLC [Member] | Comcast Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	7,000,000,000
NBCUniversal Enterprise [Member] | NBCUniversal Media LLC [Member]
Debt Instrument [Line Items]
Related party aggregate principal amount senior notes not subject to guarantee	3,300,000,000
Related party credit facility not subject to guarantee	1,500,000,000
Related party liquidation preference preferred stock not subject to guarantee	$ 725,000,000

Postretirement, Pension and O76

Postretirement, Pension and Other Employee Benefit Plans (Information On Our Pension Benefit Plans) (Details) - Postretirement Benefit Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 538	$ 820	$ 837
Plan funded status and recorded benefit obligation	(538)	(820)	(837)
Portion of benefit obligation not yet recognized in benefits expense	(372)	(33)	46
Benefits expense	70	75	$ 59
Discount rate			4.25%
NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	192	197	$ 209
Plan funded status and recorded benefit obligation	(192)	(197)	(209)
Portion of benefit obligation not yet recognized in benefits expense	(42)	(27)	(3)
Benefits expense	$ 13	$ 15	$ 12
Discount rate	4.56%	4.73%	4.25%
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.07%	4.70%
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.56%	4.73%

Postretirement, Pension and O77

Postretirement, Pension and Other Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Funded Status	At least 80 percent
Severance Costs	$ 315	$ 181	$ 152
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded percentage	80.00%
DreamWorks Animation [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Severance Costs	$ 61
NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Multiemployer Plans, Funded Status	At least 80 percent
Severance Costs	$ 165	113	113
NBCUniversal Media LLC [Member] | Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded percentage	80.00%
NBCUniversal Media LLC [Member] | DreamWorks Animation [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Severance Costs	$ 61
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	314	309
Mutliemployer plan contributions	84	77	58
Pension Plan [Member] | NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	314	309
Mutliemployer plan contributions	84	77	58
NBCUniversal Legacy Qualified Pension Plans [Member] | NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligations in excess of plan assets	62	67
Deferred Compensation Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cash surrender value of life insurance policies	709	658
Retirement Investment Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expenses related to retirement investment plans	446	416	379
Retirement Investment Plans [Member] | NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expenses related to retirement investment plans	185	174	165
Postretirement and Other Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Mutliemployer plan contributions	136	119	125
Postretirement and Other Benefits [Member] | NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Mutliemployer plan contributions	136	$ 119	$ 125
Stipend Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of benefit obligations due to plan amendments	$ 361

Postretirement, Pension and O78

Postretirement, Pension and Other Employee Benefit Plans (Deferred Compensation Plans) (Details) - Deferred Compensation Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 2,164	$ 2,038	$ 1,774
Interest expense	178	171	149
NBCUniversal Media LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	494	417	349
Interest expense	$ 48	$ 28	$ 24

Equity (Narrative) (Details)

Equity (Narrative) (Details) $ in Billions	Dec. 11, 2015shares	Dec. 31, 2016USD ($)vote
Equity [Line Items]
Number of votes entitled of each class B common stock | vote		15
Shares awarded per exchanged share (in shares) | shares	1
New Authorization [Member]
Equity [Line Items]
Stock repurchase program, authorized amount | $		$ 12
Class A Common Stock [Member]
Equity [Line Items]
Voting power		66.67%
Class B Common Stock [Member]
Equity [Line Items]
Voting power		33.33%

Equity (Changes in Common Stock

Equity (Changes in Common Stock) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding at beginning of period (in shares)	2,432,953,988	2,131,000,000	2,138,000,000
Stock compensation plans (in shares)	11,000,000	12,000,000	13,000,000
Repurchases and retirements of common stock (in shares)	(81,000,000)	(62,000,000)	(22,000,000)
Employee stock purchase plan (in shares)	3,000,000	2,000,000	2,000,000
Reclassification of Class A Special common stock (in shares)		346,000,000
Other (in shares)		4,000,000
Common stock, shares outstanding at end of period (in shares)	2,366,357,318	2,432,953,988	2,131,000,000
Class A Special Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding at beginning of period (in shares)	0	400,000,000	459,000,000
Stock compensation plans (in shares)	0	0	0
Repurchases and retirements of common stock (in shares)	0	(54,000,000)	(59,000,000)
Employee stock purchase plan (in shares)	0	0	0
Reclassification of Class A Special common stock (in shares)		(346,000,000)
Other (in shares)		0
Common stock, shares outstanding at end of period (in shares)	0	0	400,000,000
Class B Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares outstanding at beginning of period (in shares)	9,444,375	9,000,000	9,000,000
Stock compensation plans (in shares)	0	0	0
Repurchases and retirements of common stock (in shares)	0	0	0
Employee stock purchase plan (in shares)	0	0	0
Reclassification of Class A Special common stock (in shares)		0
Other (in shares)		0
Common stock, shares outstanding at end of period (in shares)	9,444,375	9,444,375	9,000,000

Equity (Aggregate Share Repurch

Equity (Aggregate Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Cash consideration	$ 5,000	$ 6,750	$ 4,251
New Authorization [Member]
Equity, Class of Treasury Stock [Line Items]
Cash consideration	$ 5,000	$ 6,750	$ 4,251
Shares repurchased (in shares)	81	116	81

Equity (Components of Accumulat

Equity (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Unrealized gains (losses) on marketable securities	$ 0	$ 1
Deferred gains (losses) on cash flow hedges	(14)	(46)
Unrecognized gains (losses) on employee benefit obligations	219	6
Cumulative translation adjustments	(107)	(135)
Accumulated other comprehensive income (loss)	$ 98	$ (174)

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 233	$ 311	$ 299
Share-based compensation arrangement by share-based payment award, award vesting period in years	5 years
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period in years	5 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards	$ 712
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years)	1 year 8 months
Restricted Stock Units (RSUs) [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards	$ 204
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years)	1 year 11 months
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards	$ 375
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years)	1 year 9 months
Period from grant date that an equity-based award expires	10 years
Employee Stock Option [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pretax compensation expense on nonvested awards	$ 28
Unrecognized pretax compensation expense on nonvested awards, weighted average period of recognition (in years)	1 year 9 months
Period from grant date that an equity-based award expires	10 years

Share-Based Compensation (Recog

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	$ 507	$ 455	$ 414
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	99	94	91
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	306	273	231
Restricted Stock Units (RSUs) [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	82	78	69
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	173	157	160
Employee Stock Option [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	9	10	16
Employee Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share-based compensation expense	28	25	23
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	$ 8	$ 6	$ 6

Share-Based Compensation (Stock

Share-Based Compensation (Stock Options and Restricted Share Units) (Details) shares in Millions	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	21
Weighted-average exercise price of awards granted during the year (in dollars per share) | $ / shares	$ 60.01
Stock options outstanding (in shares)	95
Weighted-average exercise price of shares outstanding (in dollars per share) | $ / shares	$ 42.60
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	8
Awards nonvested (in shares)	22
Weighted-average fair value at grant date of nonvested awards (in dollars per share) | $ / shares	$ 52.11

Share-Based Compensation (Restr

Share-Based Compensation (Restricted Share Units and Stock Option Fair Value) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option fair value (in dollars per share)	$ 11.55	$ 11.78	$ 11.11
Stock Option Valuation Assumptions:
Dividend yield	1.80%	1.70%	1.80%
Expected volatility	23.00%	23.00%	24.00%
Risk-free interest rate	1.50%	1.60%	2.20%
Expected option life (in years)	6 years 1 month	6 years	6 years 6 months
NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option fair value (in dollars per share)	$ 13.17	$ 11.79	$ 11.09
Stock Option Valuation Assumptions:
Dividend yield	1.70%	1.70%	1.80%
Expected volatility	23.20%	23.00%	24.00%
Risk-free interest rate	1.50%	1.60%	2.20%
Expected option life (in years)	7 years 6 months	6 years	6 years 6 months
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of RSUs (in dollars per share)	$ 60.03	$ 58.81	$ 47.91
Restricted Stock Units (RSUs) [Member] | NBCUniversal Media LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of RSUs (in dollars per share)	$ 59.58	$ 59.37	$ 48.04

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Deferred Tax Impact of a Purchase of Noncontrolling Interest	$ 129
Foreign income before taxes	871	$ 704	$ 385
Deferred tax liability attributable to temporary differences in other comprehensive income	158
Decrease in deferred income tax liabilities related to acquisitions	226
Net deferred tax liability, franchise rights	23,000
Liability for uncertain tax positions	1,100
Unrecognized tax benefits that would impact effective tax rate	600
Change in income tax expense related to effectively settled uncertain tax positions			$ 759
Unrecognized tax benefits, interest on income taxes accrued	483	510
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	598
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Operating loss carryforwards	431
Uncertain Tax Positions Indemnified By GE [Member]
Income Taxes [Line Items]
Liability for uncertain tax positions	181
Unrecognized tax benefits, interest on income taxes accrued	$ 39	$ 49

Income Taxes (Components of Inc

Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Expense (Benefit):
Federal	$ 3,190	$ 3,210	$ 2,392
State	480	570	174
Foreign	194	221	142
Current income tax expense (benefit)	3,864	4,001	2,708
Deferred Expense (Benefit):
Federal	1,192	890	1,000
State	154	66	173
Foreign	98	2	(8)
Deferred income tax expense (benefit)	1,444	958	1,165
Income tax expense	5,308	4,959	3,873
NBCUniversal Media LLC [Member]
Current Expense (Benefit):
Foreign	38	81	33
Deferred Expense (Benefit):
Foreign	96	2	(8)
Deferred income tax expense (benefit)	89	(11)	(12)
Withholding tax expense	158	139	108
U.S. domestic tax expense	13	5	10
Income tax expense	$ 305	$ 227	$ 143

Income Taxes (Federal Statutory

Income Taxes (Federal Statutory) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Federal tax at statutory rate	$ 5,024	$ 4,680	$ 4,363
State income taxes, net of federal benefit	373	326	329
Foreign income taxes, net of federal credit	65	13	0
Nontaxable income attributable to noncontrolling interests	(128)	(69)	(62)
Other adjustments	(67)	(79)	(114)
Income tax expense	5,308	4,959	3,873
Uncertain And Effectively Settled Tax Positions, Net [Member]
Income Taxes [Line Items]
Other adjustments	24	15	(408)
Accrued Interest On Uncertain And Effectively Settled Tax Positions Net [Member]
Income Taxes [Line Items]
Other adjustments	$ 17	$ 73	$ (235)

Income Taxes (Components of Net

Income Taxes (Components of Net Deferred Tax Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets:
Net operating loss carryforwards	$ 544	$ 551
Nondeductible accruals and other	3,789	3,704
Less: Valuation allowance	266	342
Total deferred tax assets, net of valuation allowance	4,067	4,014
Deferred Tax Liabilities:
Total deferred tax liabilities	38,880	37,580
Net deferred tax liability	34,813	33,566
Differences Between Book and Tax Basis of Property and Equipment and Intangible Assets [Member]
Deferred Tax Liabilities:
Deferred tax liabilities, other	37,401	36,392
Differences Between Book and Tax Basis of Investments [Member]
Deferred Tax Assets:
Deferred tax asset, other	0	101
Deferred Tax Liabilities:
Deferred tax liabilities, other	144	0
Differences Between Book and Tax Basis of Indexed Debt Securities [Member]
Deferred Tax Liabilities:
Deferred tax liabilities, other	375	457
Differences Between Book and Tax Basis of Foreign Subsidiaries [Member]
Deferred Tax Liabilities:
Deferred tax liabilities, other	$ 960	$ 731

Income Taxes (Reconciliation of

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 1,136	$ 1,171	$ 1,701
Additions based on tax positions related to the current year	74	67	63
Additions based on tax positions related to prior years	67	98	111
Additions from acquired subsidiaries	13	0	0
Reductions for tax positions of prior years	(62)	(84)	(220)
Reductions due to expiration of statutes of limitations	(44)	(41)	(448)
Settlements with tax authorities	(81)	(75)	(36)
Balance, December 31	$ 1,103	$ 1,136	$ 1,171

Supplemental Financial Inform92

Supplemental Financial Information (Receivables)(Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Supplemental Financial Information [Line Items]
Receivables, gross	$ 8,622	$ 7,595
Less: Allowance for returns and customer incentives	417	473
Less: Allowance for doubtful accounts	250	226
Receivables, net	7,955	6,896
Noncurrent receivables, net	939	721
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Receivables, gross	6,799	5,949
Less: Allowance for returns and customer incentives	413	469
Less: Allowance for doubtful accounts	84	69
Receivables, net	6,302	5,411
Noncurrent receivables, net	$ 939	$ 721

Supplemental Financial Inform93

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred gains (losses) on cash flow hedges	$ (14)	$ (46)
Unrecognized gains (losses) on employee benefit obligations	219	6
Cumulative translation adjustments	(107)	(135)
Accumulated other comprehensive income (loss)	98	(174)
NBCUniversal Media LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deferred gains (losses) on cash flow hedges	23	(1)
Unrecognized gains (losses) on employee benefit obligations	14	(1)
Cumulative translation adjustments	(172)	(210)
Accumulated other comprehensive income (loss)	$ (135)	$ (212)

Supplemental Financial Inform94

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Payments for Interest and Income Taxes
Interest	$ 2,565	$ 2,443	$ 2,389
Income taxes	3,693	3,726	3,668
NBCUniversal Media LLC [Member]
Cash Payments for Interest and Income Taxes
Interest	548	456	485
Income taxes	$ 208	$ 182	$ 174

Supplemental Financial Inform95

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Financial Information [Line Items]
Capital expenditures incurred but not yet paid	$ 1,300	$ 1,100	$ 797
Dividends payable	$ 653	$ 612	$ 572
Dividends payable (in dollars per share)	$ 0.275	$ 0.25	$ 0.225
Fair value equity securities settlement		$ 517	$ 3,200
NBCUniversal Media LLC [Member]
Supplemental Financial Information [Line Items]
Capital expenditures incurred but not yet paid	$ 189	287	$ 148
Contribution from member	$ 3,655	$ 252

Commitments and Contingencies96

Commitments and Contingencies (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2015USD ($)	Dec. 31, 2016USD ($)employee	Dec. 31, 2015USD ($)
Commitment And Contingencies [Line Items]
Carrying value of contractual obligation		$ 1,100
Contractual value of a potential obligation if option had been exercisable		$ 1,400
Payment for contingent consideration	$ 450
Gain on settlement of contingent consideration	$ 240
Workforce Subject to Collective Bargaining Arrangements [Member]
Commitment And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements | employee		8,500
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member]
Commitment And Contingencies [Line Items]
Percentage Of Employees Covered Under Collective Bargaining Agreements Expired Or Scheduled To Expire During The Next Year		15.00%
NBCUniversal Media LLC [Member]
Commitment And Contingencies [Line Items]
Carrying value of contractual obligation		$ 1,100
Contractual value of a potential obligation if option had been exercisable		$ 1,400
NBCUniversal Media LLC [Member] | Workforce Subject to Collective Bargaining Arrangements [Member]
Commitment And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements | employee		8,500
NBCUniversal Media LLC [Member] | Workforce Subject to Collective Bargaining Arrangements Expiring within One Year [Member]
Commitment And Contingencies [Line Items]
Percentage Of Employees Covered Under Collective Bargaining Agreements Expired Or Scheduled To Expire During The Next Year		15.00%
Redeemable Subsidiary Preferred Stock [Member] | NBCUniversal Enterprise [Member]
Commitment And Contingencies [Line Items]
Redeemable subsidiary preferred stock, dividend rate		5.25%
Redeemable subsidiary preferred stock, put period		30 days
Redeemable subsidiary preferred stock, call period		1 year
Level 2 [Member] | Redeemable Subsidiary Preferred Stock [Member] | NBCUniversal Enterprise [Member]
Commitment And Contingencies [Line Items]
Temporary equity, fair value of redeemable subsidiary preferred stock		$ 741	$ 758

Commitments and Contingencies97

Commitments and Contingencies (Minimum Annual Commitments under the Programming License Agreements and Operating Leases) (Details) $ in Millions	Dec. 31, 2016USD ($)
Programming and Talent Commitments
2,017	$ 5,222
2,018	4,879
2,019	3,503
2,020	4,587
2,021	3,177
Thereafter	20,847
Operating Leases
2,017	517
2,018	485
2,019	433
2,020	378
2,021	321
Thereafter	1,873
NBCUniversal Media LLC [Member]
Programming and Talent Commitments
2,017	5,213
2,018	4,876
2,019	3,503
2,020	4,587
2,021	3,177
Thereafter	20,847
Operating Leases
2,017	198
2,018	182
2,019	173
2,020	163
2,021	147
Thereafter	$ 1,238

Commitments and Contingencies98

Commitments and Contingencies (Rental expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitment And Contingencies [Line Items]
Rent expense	$ 744	$ 608	$ 580
NBCUniversal Media LLC [Member]
Commitment And Contingencies [Line Items]
Rent expense	$ 259	$ 213	$ 222

Financial Data by Business Se99

Financial Data by Business Segment (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)segment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment									5
Revenue	$ 21,025	$ 21,319	$ 19,269	$ 18,790	$ 19,245	$ 18,669	$ 18,743	$ 17,853	$ 80,403	$ 74,510	$ 68,775
Operating income (loss) before depreciation and amortization									26,417	24,678	22,923
Depreciation and amortization									9,558	8,680	8,019
Operating income (loss)	$ 4,264	$ 4,440	$ 4,066	$ 4,089	$ 4,002	$ 4,001	$ 4,105	$ 3,890	16,859	15,998	14,904
Capital Expenditures									9,135	8,499	7,420
Cash Paid for Intangible Assets									$ 1,686	1,370	1,122
Segment Reporting, Disclosure of Major Customers									No single customer accounted for a significant amount of revenue in any period.
NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | segment									4
Revenue									$ 31,593	28,462	25,428
Operating income (loss) before depreciation and amortization									7,227	6,358	5,588
Depreciation and amortization									1,805	1,539	1,495
Operating income (loss)									5,422	4,819	4,093
Capital Expenditures									1,452	1,386	1,221
Cash Paid for Intangible Assets									$ 283	211	130
Segment Reporting, Disclosure of Major Customers									No single customer accounted for a significant amount of revenue in any period.
Non United States [Member]
Segment Reporting Information [Line Items]
Revenue									$ 6,500	5,800	4,400
Non United States [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									6,517	5,799	4,433
United States [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									$ 25,076	22,663	20,995
Cable Communications [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | segment									1
NBCUniversal [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | segment									4
Revenue									$ 31,593	28,462	25,428
Operating income (loss) before depreciation and amortization									7,227	6,352	5,516
Depreciation and amortization									1,805	1,539	1,495
Operating income (loss)									5,422	4,813	4,021
Capital Expenditures									1,452	1,386	1,221
Cash Paid for Intangible Assets									283	211	130
Operating Segments [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Revenue									50,048	46,928	44,165
Operating income (loss) before depreciation and amortization									20,109	19,037	18,097
Depreciation and amortization									7,670	7,051	6,436
Operating income (loss)									12,439	11,986	11,661
Capital Expenditures									7,596	7,040	6,156
Cash Paid for Intangible Assets									$ 1,377	$ 1,151	$ 979
Cable segment revenue types as percentage of total cable revenue									100.00%	100.00%	100.00%
Operating Segments [Member] | Cable Networks [Member]
Segment Reporting Information [Line Items]
Revenue									$ 10,464	$ 9,628	$ 9,563
Operating income (loss) before depreciation and amortization									3,709	3,499	3,589
Depreciation and amortization									745	784	748
Operating income (loss)									2,964	2,715	2,841
Capital Expenditures									32	44	49
Cash Paid for Intangible Assets									20	22	21
Operating Segments [Member] | Cable Networks [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									10,464	9,628	9,563
Operating income (loss) before depreciation and amortization									3,709	3,499	3,589
Depreciation and amortization									745	784	748
Operating income (loss)									2,964	2,715	2,841
Capital Expenditures									32	44	49
Cash Paid for Intangible Assets									20	22	21
Operating Segments [Member] | Broadcast Television [Member]
Segment Reporting Information [Line Items]
Revenue									10,147	8,530	8,542
Operating income (loss) before depreciation and amortization									1,320	780	734
Depreciation and amortization									125	111	127
Operating income (loss)									1,195	669	607
Capital Expenditures									153	117	76
Cash Paid for Intangible Assets									19	17	12
Operating Segments [Member] | Broadcast Television [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									10,147	8,530	8,542
Operating income (loss) before depreciation and amortization									1,320	780	734
Depreciation and amortization									125	111	127
Operating income (loss)									1,195	669	607
Capital Expenditures									153	117	76
Cash Paid for Intangible Assets									19	17	12
Operating Segments [Member] | Filmed Entertainment [Member]
Segment Reporting Information [Line Items]
Revenue									6,360	7,287	5,008
Operating income (loss) before depreciation and amortization									697	1,234	711
Depreciation and amortization									47	26	21
Operating income (loss)									650	1,208	690
Capital Expenditures									33	14	11
Cash Paid for Intangible Assets									16	20	7
Operating Segments [Member] | Filmed Entertainment [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									6,360	7,287	5,008
Operating income (loss) before depreciation and amortization									697	1,234	711
Depreciation and amortization									47	26	21
Operating income (loss)									650	1,208	690
Capital Expenditures									33	14	11
Cash Paid for Intangible Assets									16	20	7
Operating Segments [Member] | Theme Parks [Member]
Segment Reporting Information [Line Items]
Revenue									4,946	3,339	2,623
Operating income (loss) before depreciation and amortization									2,190	1,464	1,096
Depreciation and amortization									512	292	273
Operating income (loss)									1,678	1,172	823
Capital Expenditures									922	833	671
Cash Paid for Intangible Assets									72	54	15
Operating Segments [Member] | Theme Parks [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									4,946	3,339	2,623
Operating income (loss) before depreciation and amortization									2,190	1,464	1,096
Depreciation and amortization									512	292	273
Operating income (loss)									1,678	1,172	823
Capital Expenditures									922	833	671
Cash Paid for Intangible Assets									72	54	15
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue									750	713	683
Operating income (loss) before depreciation and amortization									(874)	(815)	(763)
Depreciation and amortization									83	90	88
Operating income (loss)									(957)	(905)	(851)
Capital Expenditures									87	73	43
Cash Paid for Intangible Assets									26	8	13
Corporate, Non-Segment [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									20	14	13
Operating income (loss) before depreciation and amortization									(699)	(625)	(613)
Depreciation and amortization									376	326	326
Operating income (loss)									(1,075)	(951)	(939)
Capital Expenditures									312	378	414
Cash Paid for Intangible Assets									156	98	75
Corporate, Non-Segment [Member] | NBCUniversal [Member]
Segment Reporting Information [Line Items]
Revenue									20	14	13
Operating income (loss) before depreciation and amortization									(699)	(625)	(613)
Depreciation and amortization									376	326	326
Operating income (loss)									(1,075)	(951)	(939)
Capital Expenditures									312	378	414
Cash Paid for Intangible Assets									156	98	75
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue									(1,988)	(1,593)	(1,501)
Operating income (loss) before depreciation and amortization									(45)	104	73
Depreciation and amortization									0	0	0
Operating income (loss)									(45)	104	73
Capital Expenditures									0	0	0
Cash Paid for Intangible Assets									0	0	0
Consolidation, Eliminations [Member] | NBCUniversal Media LLC [Member]
Segment Reporting Information [Line Items]
Revenue									(344)	(336)	(321)
Operating income (loss) before depreciation and amortization									10	6	71
Depreciation and amortization									0	0	0
Operating income (loss)									10	6	71
Capital Expenditures									0	0	0
Cash Paid for Intangible Assets									0	0	0
Consolidation, Eliminations [Member] | NBCUniversal [Member]
Segment Reporting Information [Line Items]
Revenue									(344)	(336)	(321)
Operating income (loss) before depreciation and amortization									10	0	(1)
Depreciation and amortization									0	0	0
Operating income (loss)									10	0	(1)
Capital Expenditures									0	0	0
Cash Paid for Intangible Assets									$ 0	$ 0	$ 0
Residential Video Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									44.70%	45.90%	47.10%
Residential High-speed Internet Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									27.00%	26.60%	25.60%
Residential Voice Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									7.10%	7.70%	8.30%
Business Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									11.00%	10.10%	9.00%
Advertising Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									5.00%	4.90%	5.40%
Other Products And Services [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									5.20%	4.80%	4.60%
Franchise And Other Regulatory Fees [Member] | Operating Segments [Member] | Cable Communications [Member]
Segment Reporting Information [Line Items]
Cable segment revenue types as percentage of total cable revenue									2.80%	2.80%	2.80%

Quarterly Financial Informat100

Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Revenue	$ 21,025	$ 21,319	$ 19,269	$ 18,790	$ 19,245	$ 18,669	$ 18,743	$ 17,853	$ 80,403	$ 74,510	$ 68,775
Operating income	4,264	4,440	4,066	4,089	4,002	4,001	4,105	3,890	16,859	15,998	14,904
Net Income (Loss) Attributable to Parent	$ 2,296	$ 2,237	$ 2,028	$ 2,134	$ 1,971	$ 1,996	$ 2,137	$ 2,059	$ 8,695	$ 8,163	$ 8,380
Basic earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	$ 0.96	$ 0.93	$ 0.84	$ 0.88	$ 0.80	$ 0.81	$ 0.85	$ 0.82	$ 3.61	$ 3.28	$ 3.24
Diluted earnings per common share attributable to Comcast Corporation shareholders (in dollars per share)	0.95	0.92	0.83	0.87	0.79	0.80	0.84	0.81	3.57	3.24	3.20
Dividends declared per common share (in dollars per share)	$ 0.275	$ 0.275	$ 0.275	$ 0.275	$ 0.25	$ 0.25	$ 0.25	$ 0.25	$ 1.10	$ 1	$ 0.90
Verizon Wireless [Member]
Quarterly Financial Information [Line Items]
Income resulting from an agency agreement	$ 225
Income Resulting From An Agency Agreement, Net of Tax	$ 143

Condensed Consolidating Fina101

Condensed Consolidating Financial Information (Narrative) (Details) $ in Millions	Dec. 31, 2016USD ($)
Guarantor Subsidiaries [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	$ 52,900
Maturing In Next Five Years [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	12,300
NBCUniversal Enterprise Senior Debt Securities [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	3,300
Comcast Holdings' ZONES due October 2029 [Member]
Debt Instrument [Line Items]
Principal amount of debt securities subject to guarantee	185
Comcast Holdings' ZONES due November 2029 [Member]
Debt Instrument [Line Items]
Principal amount of debt securities not subject to guarantee	62
Universal Studios Japan Term Loans [Member]
Debt Instrument [Line Items]
Principal amount of debt securities not subject to guarantee	$ 3,300

Condensed Consolidating Fina102

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 3,301	$ 2,295	$ 3,910	$ 1,718
Receivables, net	7,955	6,896
Programming rights	1,250	1,213
Deposits	1,772	21
Other current assets	2,083	1,878
Total current assets	16,361	12,303
Film and television costs	7,252	5,855
Investments	5,247	3,224
Investments in and amounts due from subsidiaries eliminated upon consolidation	0	0
Property and equipment, net	36,253	33,665
Franchise rights	59,364	59,364
Goodwill	35,980	32,945	27,316
Other intangible assets, net	17,274	16,946
Other noncurrent assets, net	2,769	2,272
Total assets	180,500	166,574
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,915	6,215
Accrued participations and residuals	1,726	1,572
Accrued expenses and other current liabilities	7,414	6,764
Current portion of long-term debt	5,480	3,627
Total current liabilities	21,535	18,178
Long-term debt, less current portion	55,566	48,994
Deferred income taxes	34,854	33,566
Other noncurrent liabilities	10,925	10,637
Redeemable noncontrolling interests	1,446	1,221
Equity:
Common stock	28	29
Other shareholders’ equity	53,915	52,240
Total Comcast Corporation shareholders’ equity	53,943	52,269
Noncontrolling interests	2,231	1,709
Total equity	56,174	53,978	53,068	51,058
Total liabilities and equity	180,500	166,574
Comcast Parent [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Deposits	0	0
Other current assets	151	69
Total current assets	151	69
Film and television costs	0	0
Investments	75	33
Investments in and amounts due from subsidiaries eliminated upon consolidation	98,350	87,142
Property and equipment, net	298	210
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	13	12
Other noncurrent assets, net	1,138	1,301
Total assets	100,025	88,767
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	23	16
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities	1,726	1,789
Current portion of long-term debt	3,739	1,149
Total current liabilities	5,488	2,954
Long-term debt, less current portion	38,123	31,106
Deferred income taxes	0	0
Other noncurrent liabilities	2,471	2,438
Redeemable noncontrolling interests	0	0
Equity:
Common stock	28	29
Other shareholders’ equity	53,915	52,240
Total Comcast Corporation shareholders’ equity	53,943	52,269
Noncontrolling interests	0	0
Total equity	53,943	52,269
Total liabilities and equity	100,025	88,767
Comcast Holdings [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Deposits	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	120,071	111,241
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	638	147
Total assets	120,709	111,388
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	335
Current portion of long-term debt	0	0
Total current liabilities	0	335
Long-term debt, less current portion	141	130
Deferred income taxes	542	624
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	120,026	110,299
Total Comcast Corporation shareholders’ equity	120,026	110,299
Noncontrolling interests	0	0
Total equity	120,026	110,299
Total liabilities and equity	120,709	111,388
CCCL Parent [Member]
Assets
Cash and cash equivalents	0	0	0	0
Receivables, net	0	0
Programming rights	0	0
Deposits	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	117,696	119,354
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	117,696	119,354
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	341	290
Current portion of long-term debt	550	0
Total current liabilities	891	290
Long-term debt, less current portion	2,100	2,650
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	114,705	116,414
Total Comcast Corporation shareholders’ equity	114,705	116,414
Noncontrolling interests	0	0
Total equity	114,705	116,414
Total liabilities and equity	117,696	119,354
NBCUniversal Media Parent [Member]
Assets
Cash and cash equivalents	482	414	385	336
Receivables, net	0	0
Programming rights	0	0
Deposits	0	0
Other current assets	36	17
Total current assets	518	431
Film and television costs	0	0
Investments	651	430
Investments in and amounts due from subsidiaries eliminated upon consolidation	47,393	42,441
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	89	78
Total assets	48,651	43,380
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	302	389
Current portion of long-term debt	4	1,005
Total current liabilities	306	1,394
Long-term debt, less current portion	8,208	8,211
Deferred income taxes	70	66
Other noncurrent liabilities	1,166	1,087
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	38,901	32,622
Total Comcast Corporation shareholders’ equity	38,901	32,622
Noncontrolling interests	0	0
Total equity	38,901	32,622
Total liabilities and equity	48,651	43,380
Comcast Non-Guarantor Subsidiaries [Member]
Assets
Cash and cash equivalents	2,819	1,881	3,525	1,382
Receivables, net	7,955	6,896
Programming rights	1,250	1,213
Deposits	1,772	21
Other current assets	1,896	1,792
Total current assets	15,692	11,803
Film and television costs	7,252	5,855
Investments	4,521	2,761
Investments in and amounts due from subsidiaries eliminated upon consolidation	97,704	109,598
Property and equipment, net	35,955	33,455
Franchise rights	59,364	59,364
Goodwill	35,980	32,945
Other intangible assets, net	17,261	16,934
Other noncurrent assets, net	1,921	2,114
Total assets	275,650	274,829
Liabilities and Equity
Accounts payable and accrued expenses related to trade creditors	6,892	6,199
Accrued participations and residuals	1,726	1,572
Accrued expenses and other current liabilities	5,045	3,961
Current portion of long-term debt	1,187	1,473
Total current liabilities	14,850	13,205
Long-term debt, less current portion	6,994	6,897
Deferred income taxes	35,259	34,098
Other noncurrent liabilities	7,288	7,258
Redeemable noncontrolling interests	1,446	1,221
Equity:
Common stock	0	0
Other shareholders’ equity	207,582	210,441
Total Comcast Corporation shareholders’ equity	207,582	210,441
Noncontrolling interests	2,231	1,709
Total equity	209,813	212,150
Total liabilities and equity	275,650	274,829
Elimination and Consolidation Adjustments [Member]
Assets
Cash and cash equivalents	0	0	$ 0	$ 0
Receivables, net	0	0
Programming rights	0	0
Deposits	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	(481,214)	(469,776)
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	(1,017)	(1,368)
Total assets	(482,231)	(471,144)
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	(1,017)	(1,222)
Other noncurrent liabilities	0	(146)
Redeemable noncontrolling interests	0	0
Equity:
Common stock	0	0
Other shareholders’ equity	(481,214)	(469,776)
Total Comcast Corporation shareholders’ equity	(481,214)	(469,776)
Noncontrolling interests	0	0
Total equity	(481,214)	(469,776)
Total liabilities and equity	$ (482,231)	$ (471,144)

Condensed Consolidating Fina103

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Income Statements, Captions [Line Items]
Service revenue									$ 80,403	$ 74,510	$ 68,775
Management fee revenue									0	0	0
Revenue	$ 21,025	$ 21,319	$ 19,269	$ 18,790	$ 19,245	$ 18,669	$ 18,743	$ 17,853	80,403	74,510	68,775
Costs and Expenses:
Programming and production									24,463	22,550	20,912
Other operating and administrative									23,409	21,319	19,839
Advertising, marketing and promotion									6,114	5,963	5,101
Depreciation									7,464	6,781	6,337
Amortization									2,094	1,899	1,682
Costs and expenses, total									63,544	58,512	53,871
Operating income (loss)	4,264	4,440	4,066	4,089	4,002	4,001	4,105	3,890	16,859	15,998	14,904
Other Income (Expense):
Interest expense									(2,942)	(2,702)	(2,617)
Investment income (loss), net									213	81	296
Equity in net income (losses) of investees, net									(104)	(325)	97
Other income (expense), net									327	320	(215)
Nonoperating Income (Expense)									(2,506)	(2,626)	(2,439)
Income (loss) before income taxes									14,353	13,372	12,465
Income tax (expense) benefit									(5,308)	(4,959)	(3,873)
Net income (loss)									9,045	8,413	8,592
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									(350)	(250)	(212)
Net income attributable to Parent	$ 2,296	$ 2,237	$ 2,028	$ 2,134	$ 1,971	$ 1,996	$ 2,137	$ 2,059	8,695	8,163	8,380
Comprehensive income attributable to Parent									8,967	8,135	8,178
Comcast Parent [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									0	0	0
Management fee revenue									1,067	1,005	947
Revenue									1,067	1,005	947
Costs and Expenses:
Programming and production									0	0	0
Other operating and administrative									813	760	751
Advertising, marketing and promotion									0	0	0
Depreciation									28	31	34
Amortization									6	6	6
Costs and expenses, total									847	797	791
Operating income (loss)									220	208	156
Other Income (Expense):
Interest expense									(1,941)	(1,744)	(1,621)
Investment income (loss), net									7	6	3
Equity in net income (losses) of investees, net									9,809	9,159	9,330
Other income (expense), net									0	(3)	0
Nonoperating Income (Expense)									7,875	7,418	7,712
Income (loss) before income taxes									8,095	7,626	7,868
Income tax (expense) benefit									600	537	512
Net income (loss)									8,695	8,163	8,380
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									0	0	0
Net income attributable to Parent									8,695	8,163	8,380
Comprehensive income attributable to Parent									8,967	8,135	8,178
Comcast Holdings [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									0	0	0
Management fee revenue									0	0	0
Revenue									0	0	0
Costs and Expenses:
Programming and production									0	0	0
Other operating and administrative									0	0	0
Advertising, marketing and promotion									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									0	0	0
Operating income (loss)									0	0	0
Other Income (Expense):
Interest expense									(12)	(12)	(11)
Investment income (loss), net									(5)	(1)	12
Equity in net income (losses) of investees, net									9,286	8,651	8,843
Other income (expense), net									0	0	0
Nonoperating Income (Expense)									9,269	8,638	8,844
Income (loss) before income taxes									9,269	8,638	8,844
Income tax (expense) benefit									6	4	0
Net income (loss)									9,275	8,642	8,844
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									0	0	0
Net income attributable to Parent									9,275	8,642	8,844
Comprehensive income attributable to Parent									9,317	8,625	8,807
CCCL Parent [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									0	0	0
Management fee revenue									1,049	977	921
Revenue									1,049	977	921
Costs and Expenses:
Programming and production									0	0	0
Other operating and administrative									1,049	977	921
Advertising, marketing and promotion									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									1,049	977	921
Operating income (loss)									0	0	0
Other Income (Expense):
Interest expense									(239)	(270)	(294)
Investment income (loss), net									0	0	0
Equity in net income (losses) of investees, net									8,679	8,040	8,350
Other income (expense), net									0	0	0
Nonoperating Income (Expense)									8,440	7,770	8,056
Income (loss) before income taxes									8,440	7,770	8,056
Income tax (expense) benefit									84	94	103
Net income (loss)									8,524	7,864	8,159
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									0	0	0
Net income attributable to Parent									8,524	7,864	8,159
Comprehensive income attributable to Parent									8,530	7,864	8,163
NBCUniversal Media Parent [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									0	0	0
Management fee revenue									0	0	0
Revenue									0	0	0
Costs and Expenses:
Programming and production									0	0	0
Other operating and administrative									932	922	908
Advertising, marketing and promotion									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									932	922	908
Operating income (loss)									(932)	(922)	(908)
Other Income (Expense):
Interest expense									(456)	(462)	(479)
Investment income (loss), net									(25)	(19)	(7)
Equity in net income (losses) of investees, net									5,545	4,852	4,523
Other income (expense), net									116	(31)	(4)
Nonoperating Income (Expense)									5,180	4,340	4,033
Income (loss) before income taxes									4,248	3,418	3,125
Income tax (expense) benefit									(13)	(4)	(10)
Net income (loss)									4,235	3,414	3,115
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									0	0	0
Net income attributable to Parent									4,235	3,414	3,115
Comprehensive income attributable to Parent									4,312	3,361	2,972
Comcast Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									80,403	74,510	68,775
Management fee revenue									0	0	0
Revenue									80,403	74,510	68,775
Costs and Expenses:
Programming and production									24,463	22,550	20,912
Other operating and administrative									22,731	20,642	19,127
Advertising, marketing and promotion									6,114	5,963	5,101
Depreciation									7,436	6,750	6,303
Amortization									2,088	1,893	1,676
Costs and expenses, total									62,832	57,798	53,119
Operating income (loss)									17,571	16,712	15,656
Other Income (Expense):
Interest expense									(294)	(214)	(212)
Investment income (loss), net									236	95	288
Equity in net income (losses) of investees, net									4,131	3,089	3,212
Other income (expense), net									211	354	(211)
Nonoperating Income (Expense)									4,284	3,324	3,077
Income (loss) before income taxes									21,855	20,036	18,733
Income tax (expense) benefit									(5,985)	(5,590)	(4,478)
Net income (loss)									15,870	14,446	14,255
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									(350)	(250)	(212)
Net income attributable to Parent									15,520	14,196	14,043
Comprehensive income attributable to Parent									15,610	14,192	13,980
Elimination and Consolidation Adjustments [Member]
Condensed Income Statements, Captions [Line Items]
Service revenue									0	0	0
Management fee revenue									(2,116)	(1,982)	(1,868)
Revenue									(2,116)	(1,982)	(1,868)
Costs and Expenses:
Programming and production									0	0	0
Other operating and administrative									(2,116)	(1,982)	(1,868)
Advertising, marketing and promotion									0	0	0
Depreciation									0	0	0
Amortization									0	0	0
Costs and expenses, total									(2,116)	(1,982)	(1,868)
Operating income (loss)									0	0	0
Other Income (Expense):
Interest expense									0	0	0
Investment income (loss), net									0	0	0
Equity in net income (losses) of investees, net									(37,554)	(34,116)	(34,161)
Other income (expense), net									0	0	0
Nonoperating Income (Expense)									(37,554)	(34,116)	(34,161)
Income (loss) before income taxes									(37,554)	(34,116)	(34,161)
Income tax (expense) benefit									0	0	0
Net income (loss)									(37,554)	(34,116)	(34,161)
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock									0	0	0
Net income attributable to Parent									(37,554)	(34,116)	(34,161)
Comprehensive income attributable to Parent									$ (37,769)	$ (34,042)	$ (33,922)

Condensed Consolidating Fina104

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net cash provided by operating activities	$ 19,240	$ 18,778	$ 16,945
Investing Activities
Net transactions with affiliates	0	0	0
Capital expenditures	(9,135)	(8,499)	(7,420)
Cash paid for intangible assets	(1,686)	(1,370)	(1,122)
Acquisitions and construction of real estate properties	(428)	(178)	(43)
Acquisitions, net of cash acquired	(3,929)	(1,786)	(477)
Proceeds from sales of businesses and investments	218	433	666
Purchases of investments	(1,697)	(784)	(191)
Deposits	(1,749)	(18)	0
Other	21	238	(146)
Net cash provided by (used in) investing activities	(18,385)	(11,964)	(8,733)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	1,790	135	(504)
Proceeds from borrowings	9,231	5,486	4,182
Repurchases and repayments of debt	(3,052)	(4,378)	(3,175)
Repurchases and retirements of common stock	(5,000)	(6,750)	(4,251)
Dividends paid	(2,601)	(2,437)	(2,254)
Issuances of common stock	23	36	35
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(253)	(232)	(220)
Other	13	(289)	167
Net cash provided by (used in) financing activities	151	(8,429)	(6,020)
Increase (decrease) in cash and cash equivalents	1,006	(1,615)	2,192
Cash and cash equivalents, beginning of year	2,295	3,910	1,718
Cash and cash equivalents, end of year	3,301	2,295	3,910
Comcast Parent [Member]
Operating Activities
Net cash provided by operating activities	(1,332)	(792)	(354)
Investing Activities
Net transactions with affiliates	(860)	6,559	4,784
Capital expenditures	(13)	(27)	(3)
Cash paid for intangible assets	(9)	(6)	(6)
Acquisitions and construction of real estate properties	(35)	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of businesses and investments	0	0	0
Purchases of investments	(40)	(7)	(19)
Deposits	0	0	0
Other	(108)	7	0
Net cash provided by (used in) investing activities	(1,065)	6,526	4,756
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	1,339	400	(1,350)
Proceeds from borrowings	9,231	5,486	4,180
Repurchases and repayments of debt	(750)	(2,650)	(1,000)
Repurchases and retirements of common stock	(5,000)	(6,750)	(4,251)
Dividends paid	(2,601)	(2,437)	(2,254)
Issuances of common stock	23	36	35
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0	0
Other	155	181	238
Net cash provided by (used in) financing activities	2,397	(5,734)	(4,402)
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	0	0	0
Comcast Holdings [Member]
Operating Activities
Net cash provided by operating activities	(189)	48	9
Investing Activities
Net transactions with affiliates	189	(48)	(9)
Capital expenditures	0	0	0
Cash paid for intangible assets	0	0	0
Acquisitions and construction of real estate properties	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of businesses and investments	0	0	0
Purchases of investments	0	0	0
Deposits	0	0	0
Other	0	0	0
Net cash provided by (used in) investing activities	189	(48)	(9)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0	0
Proceeds from borrowings	0	0	0
Repurchases and repayments of debt	0	0	0
Repurchases and retirements of common stock	0	0	0
Dividends paid	0	0	0
Issuances of common stock	0	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	0	0	0
CCCL Parent [Member]
Operating Activities
Net cash provided by operating activities	(100)	(167)	(139)
Investing Activities
Net transactions with affiliates	100	840	139
Capital expenditures	0	0	0
Cash paid for intangible assets	0	0	0
Acquisitions and construction of real estate properties	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of businesses and investments	0	0	0
Purchases of investments	0	0	0
Deposits	0	0	0
Other	0	0	0
Net cash provided by (used in) investing activities	100	840	139
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0	0
Proceeds from borrowings	0	0	0
Repurchases and repayments of debt	0	(673)	0
Repurchases and retirements of common stock	0	0	0
Dividends paid	0	0	0
Issuances of common stock	0	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	0	(673)	0
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	0	0	0
NBCUniversal Media Parent [Member]
Operating Activities
Net cash provided by operating activities	(1,453)	(1,398)	(1,299)
Investing Activities
Net transactions with affiliates	2,642	2,839	2,247
Capital expenditures	0	0	0
Cash paid for intangible assets	0	0	0
Acquisitions and construction of real estate properties	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of businesses and investments	104	4	8
Purchases of investments	(210)	(407)	(10)
Deposits	0	0	0
Other	(35)	(5)	5
Net cash provided by (used in) investing activities	2,501	2,431	2,250
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0	0
Proceeds from borrowings	0	0	0
Repurchases and repayments of debt	(1,005)	(1,004)	(902)
Repurchases and retirements of common stock	0	0	0
Dividends paid	0	0	0
Issuances of common stock	0	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0	0
Other	25	0	0
Net cash provided by (used in) financing activities	(980)	(1,004)	(902)
Increase (decrease) in cash and cash equivalents	68	29	49
Cash and cash equivalents, beginning of year	414	385	336
Cash and cash equivalents, end of year	482	414	385
Comcast Non-Guarantor Subsidiaries [Member]
Operating Activities
Net cash provided by operating activities	22,314	21,087	18,728
Investing Activities
Net transactions with affiliates	(2,071)	(10,190)	(7,161)
Capital expenditures	(9,122)	(8,472)	(7,417)
Cash paid for intangible assets	(1,677)	(1,364)	(1,116)
Acquisitions and construction of real estate properties	(393)	(178)	(43)
Acquisitions, net of cash acquired	(3,929)	(1,786)	(477)
Proceeds from sales of businesses and investments	114	429	658
Purchases of investments	(1,447)	(370)	(162)
Deposits	(1,749)	(18)	0
Other	164	236	(151)
Net cash provided by (used in) investing activities	(20,110)	(21,713)	(15,869)
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	451	(265)	846
Proceeds from borrowings	0	0	2
Repurchases and repayments of debt	(1,297)	(51)	(1,273)
Repurchases and retirements of common stock	0	0	0
Dividends paid	0	0	0
Issuances of common stock	0	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	(253)	(232)	(220)
Other	(167)	(470)	(71)
Net cash provided by (used in) financing activities	(1,266)	(1,018)	(716)
Increase (decrease) in cash and cash equivalents	938	(1,644)	2,143
Cash and cash equivalents, beginning of year	1,881	3,525	1,382
Cash and cash equivalents, end of year	2,819	1,881	3,525
Elimination and Consolidation Adjustments [Member]
Operating Activities
Net cash provided by operating activities	0	0	0
Investing Activities
Net transactions with affiliates	0	0	0
Capital expenditures	0	0	0
Cash paid for intangible assets	0	0	0
Acquisitions and construction of real estate properties	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sales of businesses and investments	0	0	0
Purchases of investments	0	0	0
Deposits	0	0	0
Other	0	0	0
Net cash provided by (used in) investing activities	0	0	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0	0
Proceeds from borrowings	0	0	0
Repurchases and repayments of debt	0	0	0
Repurchases and retirements of common stock	0	0	0
Dividends paid	0	0	0
Issuances of common stock	0	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0	0
Other	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	$ 0	$ 0	$ 0

Schedule II Valuation and Qu105

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 226	$ 205	$ 221
Additions Charged to Costs and Expenses	86	166	162
Deductions from Reserves	62	145	178
Balance at End of Year	250	226	205
Allowance for doubtful accounts [Member] | NBCUniversal Media LLC [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	69	60	65
Additions Charged to Costs and Expenses	26	27	11
Deductions from Reserves	11	18	16
Balance at End of Year	84	69	60
Allowance for returns and customer incentives [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	473	359	375
Additions Charged to Costs and Expenses	1,041	1,236	932
Deductions from Reserves	1,097	1,122	948
Balance at End of Year	417	473	359
Allowance for returns and customer incentives [Member] | NBCUniversal Media LLC [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	469	356	372
Additions Charged to Costs and Expenses	1,040	1,233	930
Deductions from Reserves	1,096	1,120	946
Balance at End of Year	413	469	356
Valuation allowance on deferred tax assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	342	375	405
Additions Charged to Costs and Expenses	23	4	33
Deductions from Reserves	99	37	63
Balance at End of Year	266	342	375
Valuation allowance on deferred tax assets [Member] | NBCUniversal Media LLC [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	71	87	60
Additions Charged to Costs and Expenses	23	4	33
Deductions from Reserves	22	20	6
Balance at End of Year	$ 72	$ 71	$ 87