Comcast (CMCSA) 10-Q 22 Apr 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	31-Mar-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q1
Trading Symbol	'cmcsa
Entity Registrant Name	'COMCAST CORP
Entity Central Index Key	'0001166691
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
NBCUniversal Media, LLC [Member]	'
Amendment Flag	'false
Entity Registrant Name	'NBCUniversal Media, LLC
Entity Central Index Key	'0000902739
Entity Filer Category	'Non-accelerated Filer
Class A Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	2,146,295,093
ClassA Special Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	444,064,771
Class B Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	9,444,375

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheet (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$3,054	$1,718
Investments [Current]	2,389	3,573
Receivables, net	6,151	6,376
Programming rights	863	928
Other current assets	1,586	1,480
Total current assets	14,043	14,075
Film and television costs	5,058	4,994
Investments	3,090	3,770
Property and equipment, net	29,588	29,840
Franchise rights	59,364	59,364
Goodwill	27,103	27,098
Other intangible assets, net	17,145	17,329
Other noncurrent assets, net	2,382	2,343
Total assets	157,773	158,813
Current Liabilities:	'	'
Accounts payable and accrued expenses related to trade creditors	5,534	5,528
Accrued participations and residuals	1,256	1,239
Deferred revenue	776	898
Accrued expenses and other current liabilities	7,418	7,967
Current portion of long-term debt	2,819	3,280
Total current liabilities	17,803	18,912
Long-term debt, less current portion	44,581	44,567
Deferred income taxes	31,595	31,935
Other noncurrent liabilities	11,109	11,384
Commitments and contingencies	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,053	957
Equity:	'	'
Preferred stock - authorized, 20,000,000 shares; issued, zero	0	0
Common stock	30	30
Additional paid-in capital	38,985	38,890
Retained earnings	19,737	19,235
Treasury stock, 365,460,750 Class A common shares and 70,934,764 Class A Special common shares	-7,517	-7,517
Accumulated other comprehensive income (loss)	33	56
Total Comcast Corporation shareholders' equity	51,268	50,694
Noncontrolling interests	364	364
Total equity	51,632	51,058
Total liabilities and equity	157,773	158,813
NBCUniversal Media, LLC [Member]	'	'
Current Assets:	'	'
Cash and cash equivalents	1,125	967
Receivables, net	4,826	4,911
Programming rights	843	903
Other current assets	804	615
Total current assets	7,598	7,396
Film and television costs	5,048	4,983
Investments	898	884
Property and equipment, net	7,727	7,650
Goodwill	14,887	14,882
Intangible assets, net	14,688	14,857
Other noncurrent assets, net	1,093	1,087
Total assets	51,939	51,739
Current Liabilities:	'	'
Accounts payable and accrued expenses related to trade creditors	1,421	1,583
Accrued participations and residuals	1,256	1,239
Program obligations	654	657
Deferred revenue	689	846
Accrued expenses and other current liabilities	1,269	1,465
Note payable to Comcast	938	799
Current portion of long-term debt	905	906
Total current liabilities	7,132	7,495
Long-term debt, less current portion	10,255	10,259
Accrued participations residuals and program obligations	1,055	1,015
Other noncurrent liabilities	3,362	3,412
Commitments and contingencies	'	'
Redeemable noncontrolling interests	317	231
Equity:	'	'
Member's capital	29,542	29,056
Accumulated other comprehensive income (loss)	-13	-16
Total NBCUniversal member's equity	29,529	29,040
Noncontrolling interests	289	287
Total NBCUniversal equity	29,818	29,327
Total liabilities and equity	51,939	51,739
Class A Common Stock [Member]	'	'
Equity:	'	'
Common stock	25	25
Class B Common Stock [Member]	'	'
Equity:	'	'
Common stock	0	0
ClassA Special Common Stock [Member]	'	'
Equity:	'	'
Common stock	$5	$5

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Accumulated depreciation	$43,381	$42,574
Accumulated amortization	9,141	8,874
NBCUniversal Media, LLC [Member]	'	'
Accumulated depreciation	1,748	1,599
Accumulated amortization	$4,152	$4,003
Class A Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	2,511,755,843	2,503,535,883
Common stock, outstanding	2,146,295,093	2,138,075,133
Treasury stock common shares	365,460,750	365,460,750
ClassA Special Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	514,999,535	529,964,944
Common stock, outstanding	444,064,771	459,030,180
Treasury stock common shares	70,934,764	70,934,764
Class B Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	75,000,000	75,000,000
Common stock, issued	9,444,375	9,444,375
Common stock, outstanding	9,444,375	9,444,375

Condensed_Consolidated_Stateme

Condensed Consolidated Statement of Income (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$17,408	$15,310
Costs and Expenses:	'	'
Programming and production	5,908	4,663
Other operating and administrative	4,752	4,466
Advertising, marketing and promotion	1,210	1,147
Depreciation	1,569	1,566
Amortization	401	401
Total costs and expenses	13,840	12,243
Operating income	3,568	3,067
Other Income (Expense):	'	'
Interest expense	-642	-653
Investment income (loss), net	113	72
Equity in net income (losses) of investees, net	32	11
Other income (expense), net	-15	73
Nonoperating income (expense)	-512	-497
Income before income taxes	3,056	2,570
Income tax expense	-1,118	-925
Net income	1,938	1,645
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-67	-208
Net income attributable to Parent	1,871	1,437
Basic earnings per common share attributable to Comcast Corporation shareholders	$0.72	$0.55
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.71	$0.54
Dividends declared per common share	$0.23	$0.20
NBCUniversal Media, LLC [Member]	'	'
Revenue	6,876	5,340
Costs and Expenses:	'	'
Programming and production	3,742	2,701
Other operating and administrative	1,274	1,168
Advertising, marketing and promotion	549	518
Depreciation	162	151
Amortization	203	193
Total costs and expenses	5,930	4,731
Operating income	946	609
Other Income (Expense):	'	'
Interest expense	-129	-129
Investment income (loss), net	6	3
Equity in net income (losses) of investees, net	18	11
Other income (expense), net	-36	-42
Nonoperating income (expense)	-141	-157
Income before income taxes	805	452
Income tax expense	-64	-41
Net income	741	411
Net income attributable to Parent	$682	$355

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Income (NBCUniversal) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$17,408	$15,310
Costs and Expenses:	'	'
Programming and production	5,908	4,663
Other operating and administrative	4,752	4,466
Advertising, marketing and promotion	1,210	1,147
Depreciation	1,569	1,566
Amortization	401	401
Total costs and expenses	13,840	12,243
Operating income	3,568	3,067
Other Income (Expense):	'	'
Interest expense	-642	-653
Investment income (loss), net	113	72
Equity in net income (losses) of investees, net	32	11
Other income (expense), net	-15	73
Nonoperating income (expense)	-512	-497
Income before income taxes	3,056	2,570
Income tax expense	-1,118	-925
Net income	1,938	1,645
Net income attributable to Parent	1,871	1,437
N B C Universal Media L L C [Member]	'	'
Revenue	6,876	5,340
Costs and Expenses:	'	'
Programming and production	3,742	2,701
Other operating and administrative	1,274	1,168
Advertising, marketing and promotion	549	518
Depreciation	162	151
Amortization	203	193
Total costs and expenses	5,930	4,731
Operating income	946	609
Other Income (Expense):	'	'
Interest expense	-129	-129
Investment income (loss), net	6	3
Equity in net income (losses) of investees, net	18	11
Other income (expense), net	-36	-42
Nonoperating income (expense)	-141	-157
Income before income taxes	805	452
Income tax expense	-64	-41
Net income	741	411
Net (income) loss attributable to noncontrolling interests	-59	-56
Net income attributable to Parent	$682	$355

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$1,938	$1,645
Unrealized gains (losses) on marketable securities, net of deferred taxes	30	20
Deferred gains (losses) on cash flow hedges, net of deferred taxes	-2	-36
Amounts Reclassified To Net Income:	'	'
Realized (gains) losses on marketable securities, net of deferred taxes	-50	-23
Realized (gains) losses on cash flow hedges, net of deferred taxes	-3	46
Employee benefit obligations, net of deferred taxes	'	1
Currency translation adjustments, net of deferred taxes	2	-17
Comprehensive income	1,915	1,636
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-67	-208
Other comprehensive (income) loss attributable to noncontrolling interests	'	9
Comprehensive income attributable to Parent	1,848	1,437
NBCUniversal Media, LLC [Member]	'	'
Net income	741	411
Amounts Reclassified To Net Income:	'	'
Currency translation adjustments, net of deferred taxes	3	-22
Comprehensive income	744	389
Net (income) loss attributable to noncontrolling interests	-59	-56
Comprehensive income attributable to Parent	$685	$333

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Unrealized gains (losses) on marketable securities, deferred taxes	($17)	($12)
Deferred gains (losses) on cash flow hedges, deferred taxes	1	21
Realized (gains) losses on marketable securities, deferred taxes	30	12
Realized (gains) losses on cash flow hedges, deferred taxes	2	-27
Employee benefit obligations, deferred taxes	'	-1
Currency translation adjustments, deferred taxes	($1)	$5

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Cash Flows (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities	'	'
Net cash provided by (used in) operating activities	$4,486	$4,369
Investing Activities	'	'
Capital expenditures	-1,448	-1,361
Cash paid for intangible assets	-217	-182
Acquisitions and construction of real estate properties	'	-1,311
Proceeds from sales of businesses and investments	300	74
Purchases of investments	-37	-88
Other	-103	105
Net cash provided by (used in) investing activities	-1,505	-2,763
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-364	491
Proceeds from borrowings	2,187	2,933
Repurchases and repayments of debt	-2,260	-1,811
Repurchases and retirements of common stock	-750	-500
Dividends paid	-508	-429
Issuances of common stock	20	13
Purchase of NBCUniversal noncontrolling common equity interest	'	-10,747
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-66	-49
Settlement of Station Venture liability	'	-602
Other	96	-17
Net cash provided by (used in) financing activities	-1,645	-10,718
Increase (decrease) in cash and cash equivalents	1,336	-9,112
Cash and cash equivalents, beginning of period	1,718	10,951
Cash and cash equivalents, end of period	3,054	1,839
NBCUniversal Media, LLC [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	756	1,105
Investing Activities	'	'
Capital expenditures	-291	-263
Cash paid for intangible assets	-32	-26
Note receivable from Comcast	'	-400
Acquisitions of real estate properties	'	-1,311
Purchases of investments	-7	-37
Other	-153	-9
Net cash provided by (used in) investing activities	-483	-2,046
Financing Activities	'	'
Proceeds from (repayments of) borrowings from Comcast, net	139	'
Repurchases and repayments of debt	-1	-88
Redemption Transaction distribution	'	-3,200
Distributions to noncontrolling interests	-54	-48
Distributions to member	-195	'
Settlement of Station Venture liability	'	-602
Other	-4	-39
Net cash provided by (used in) financing activities	-115	-3,977
Increase (decrease) in cash and cash equivalents	158	-4,918
Cash and cash equivalents, beginning of period	967	5,921
Cash and cash equivalents, end of period	$1,125	$1,003

Condensed_Consolidated_Stateme5

Condensed Consolidated Statement of Changes in Equity (USD $)

Total

NBCUniversal Media, LLC [Member]

Redeemable Noncontrolling Interests And Redeemable Subisdiary Preferred Stock [Member]

Class A Common Stock [Member]

ClassA Special Common Stock [Member]

Class B Common Stock [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Treasury Stock at Cost [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interests [Member]

Noncontrolling Interests [Member]

Redeemable Noncontrolling Interest [Member]

Member's Capital [Member]

In Millions

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

Beginning balance at Dec. 31, 2012

'

$32,254

'

'

'

'

'

'

'

'

($65)

'

$419

$131

$31,900

Beginning Balance at Dec. 31, 2012

49,796

'

16,998

25

6

0

40,547

16,280

-7,517

15

'

440

'

'

'

Stock compensation plans

21

'

'

'

'

'

146

-125

'

'

'

'

'

'

'

Repurchases and retirements of common stock

-500

'

'

'

'

'

-152

-348

'

'

'

'

'

'

'

Employee stock purchase plans

22

'

'

'

'

'

22

'

'

'

'

'

'

'

'

Compensation Plans

'

7

'

'

'

'

'

'

'

'

'

'

'

'

7

Other comprehensive income (loss)

'

-22

-9

'

'

'

'

'

'

'

-22

'

'

'

'

Redemption Transaction distribution

'

-3,200

'

'

'

'

'

'

'

'

'

'

'

'

-3,200

Dividends declared

-514

'

'

'

'

'

'

-514

'

'

'

'

'

'

'

Purchase of NBCUniversal noncontrolling common equity interest

-1,508

'

-17,006

'

'

'

-1,482

'

'

-26

'

'

'

'

'

Redeemable subsidiary preferred stock

'

'

725

'

'

'

'

'

'

'

'

'

'

'

'

Contributions from (distributions to) noncontrolling interests, net

-31

-39

-9

'

'

'

'

'

'

'

'

-31

-39

-9

'

Other

-121

-170

-4

'

'

'

-124

'

'

'

'

3

2

'

-172

Net income (loss)

1,486

405

159

'

'

'

'

1,437

'

'

'

49

50

6

355

Ending Balance at Mar. 31, 2013

48,651

'

854

25

6

0

38,957

16,730

-7,517

-11

'

461

'

'

'

Ending balance at Mar. 31, 2013

'

29,235

'

'

'

'

'

'

'

'

-87

'

432

128

28,890

Beginning balance at Dec. 31, 2013

'

29,327

'

'

'

'

'

'

'

'

-16

'

287

231

29,056

Beginning Balance at Dec. 31, 2013

51,058

'

957

25

5

0

38,890

19,235

-7,517

56

'

364

'

'

'

Stock compensation plans

36

'

'

'

'

'

242

-206

'

'

'

'

'

'

'

Repurchases and retirements of common stock

-750

'

'

'

'

'

-172

-578

'

'

'

'

'

'

'

Employee stock purchase plans

26

'

'

'

'

'

26

'

'

'

'

'

'

'

'

Other comprehensive income (loss)

-23

3

'

'

'

'

'

'

'

-23

3

'

'

'

'

Dividends declared

-585

-195

'

'

'

'

'

-585

'

'

'

'

'

'

-195

Issuance of subsidiary shares to noncontrolling interests

'

'

82

'

'

'

'

'

'

'

'

'

'

82

'

Contributions from (distributions to) noncontrolling interests, net

-37

-44

-5

'

'

'

'

'

'

'

'

-37

-44

-10

'

Other

-7

'

-5

'

'

'

-1

'

'

'

'

-6

1

'

-1

Net income (loss)

1,914

727

24

'

'

'

'

1,871

'

'

'

43

45

14

682

Ending Balance at Mar. 31, 2014

51,632

'

1,053

25

5

0

38,985

19,737

-7,517

33

'

364

'

'

'

Ending balance at Mar. 31, 2014

'

$29,818

'

'

'

'

'

'

'

'

($13)

'

$289

$317

$29,542

Condensed_Consolidated_Financi

Condensed Consolidated Financial Statements	3 Months Ended
	Mar. 31, 2014
Condensed Consolidated Financial Statements	'
	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	We have prepared these unaudited condensed consolidated financial statements based on Securities and Exchange Commission (“SEC”) rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.
	The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States of America (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2013 Annual Report on Form 10-K.
NBCUniversal Media, LLC [Member]	'
Condensed Consolidated Financial Statements	'
	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	We have prepared these unaudited condensed consolidated financial statements based on Securities and Exchange Commission (“SEC”) rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.
	The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States of America (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2013 Annual Report on Form 10-K.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share	'
Earnings Per Share	'
	Note 2: Earnings Per Share
	Computation of Diluted EPS
			Three Months Ended March 31
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation shareholders		$	1,871	2,603	$	0.72	$	1,437	2,634	$	0.55
	Effect of dilutive securities:
	Assumed exercise or issuance of shares relating to stock
		plans			42					41
	Diluted EPS attributable to Comcast Corporation
		shareholders	$	1,871	2,645	$	0.71	$	1,437	2,675	$	0.54
	Our potentially dilutive securities include potential common shares related to our stock options and our restricted share units (“RSUs”). Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Diluted EPS excludes the impact of potential common shares related to our stock options in periods in which the combination of the option exercise price and the associated unrecognized compensation expense is greater than the average market price of our Class A common stock or our Class A Special common stock, as applicable.
	Diluted EPS for the three months ended March 31, 2014 and 2013 excludes 2 million of potential common shares related to our share-based compensation plans, because the inclusion of the potential common shares would have had an antidilutive effect.

Significant_Transactions

Significant Transactions	3 Months Ended
	Mar. 31, 2014
Significant Transactions	'
	Note 3: Significant Transactions
	Time Warner Cable Transaction
	On February 12, 2014, we entered into an agreement and plan of merger with Time Warner Cable Inc. (“Time Warner Cable”). As a result of this agreement, we will acquire 100% of Time Warner Cable's outstanding shares of common stock in exchange for shares of our Class A common stock. Time Warner Cable stockholders will receive, in exchange for each share of Time Warner Cable common stock owned immediately prior to the transaction, 2.875 shares of our Class A common stock. Time Warner Cable stockholders will then own approximately 23% of our common stock, estimated based on the number of shares outstanding as of the date of the agreement. Because the exchange ratio was fixed at the time of the merger agreement and the market value of our Class A common stock will continue to fluctuate, the number of shares of Class A common stock to be issued and the total value of the consideration exchanged will not be determinable until the closing date. Following the close of the transaction, Time Warner Cable will be our wholly owned subsidiary. The transaction remains subject to shareholder approval at both companies, regulatory review and other customary conditions and is expected to close by the end of 2014.

Related_Party_Transactions

Related Party Transactions (NBCUniversal Media, LLC [Member])	3 Months Ended
	Mar. 31, 2014
NBCUniversal Media, LLC [Member]	'
Related Party Transactions	'
	Note 2: Related Party Transactions
	In the ordinary course of our business, we enter into transactions with Comcast Corporation (“Comcast”).
	We generate revenue from Comcast primarily from the distribution of our cable network programming and, to a lesser extent, the sale of advertising and our owned programming, and we incur expenses primarily related to various support services provided by Comcast to us.
	In 2013, as part of the Comcast cash management process, we and Comcast entered into a revolving credit agreement under which we can borrow up to $3 billion from Comcast and Comcast can borrow up to $3 billion from us. Amounts owed by us to Comcast under the revolving credit agreement, including accrued interest, are presented under the caption “note payable to Comcast” in our condensed consolidated balance sheet. The revolving credit agreements bear interest at floating rates equal to the interest rate under the Comcast and Comcast Cable Communications, LLC revolving credit facility (the “Comcast revolving credit facility”). The interest rate on the Comcast revolving credit facility consists of a base rate plus a borrowing margin that is determined based on Comcast's credit rating. As of March 31, 2014, the borrowing margin for London Interbank Offered Rate based borrowings was 1.00%.
	In addition, Comcast is the counterparty to one of our contractual obligations. As of March 31, 2014, the carrying value of the liability associated with this contractual obligation was $383 million.
	The following tables present transactions with Comcast and its consolidated subsidiaries that are included in our condensed consolidated financial statements.
	Condensed Consolidated Balance Sheet
			March 31,		December 31,
	(in millions)		2014			2013
	Transactions with Comcast and consolidated subsidiaries
		Receivables, net	$	234	$	228
		Accounts payable and accrued expenses related to trade creditors	$	43	$	56
		Accrued expenses and other current liabilities	$	9	$	37
		Note payable to Comcast	$	938	$	799
		Other noncurrent liabilities	$	383	$	383
	Condensed Consolidated Statement of Income
			Three Months Ended March 31
	(in millions)			2014		2013
	Transactions with Comcast and consolidated subsidiaries
		Revenue	$	361	$	352
		Operating costs and expenses	$	-37	$	-62
		Other income (expense)	$	-9	$	-
	Distributions to NBCUniversal Holdings
	In addition to the transactions 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, Inc. at an initial annual rate of 8.25% on the $9.4 billion aggregate liquidation preference of preferred units. These distributions are presented under the caption “distributions to member” in our condensed consolidated statement of cash flows.

Film_and_Television_Costs

Film and Television Costs	3 Months Ended
	Mar. 31, 2014
Film And Television Costs Disclosure [Text Block]	'
	Note 4: Film and Television Costs
				March 31,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,480	$	1,630
		Completed, not released		40		70
		In production and in development		865		658
				2,385		2,358
	Television Costs:
		Released, less amortization		1,169		1,155
		In production and in development		363		370
				1,532		1,525
	Programming rights, less amortization			2,004		2,039
				5,921		5,922
	Less: Current portion of programming rights			863		928
	Film and television costs		$	5,058	$	4,994
NBCUniversal Media, LLC [Member]	'
Film And Television Costs Disclosure [Text Block]	'
	Note 3: Film and Television Costs
				March 31,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,480	$	1,630
		Completed, not released		40		70
		In production and in development		865		658
				2,385		2,358
	Television Costs:
		Released, less amortization		1,169		1,155
		In production and in development		363		370
				1,532		1,525
	Programming rights, less amortization			1,974		2,003
				5,891		5,886
	Less: Current portion of programming rights			843		903
	Film and television costs		$	5,048	$	4,983

Investments

Investments	3 Months Ended
	Mar. 31, 2014
Investments	'
	Note 5: Investments
				March 31,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	2,448	$	4,345
	Equity Method:
		The Weather Channel		331		333
		Hulu		191		187
		Other		496		469
				1,018		989
	Cost Method:
		AirTouch		1,556		1,553
		Other		457		456
				2,013		2,009
	Total investments			5,479		7,343
	Less: Current investments			2,389		3,573
	Noncurrent investments		$	3,090	$	3,770
	Investment Income (Loss), Net
			Three Months Ended
			31-Mar
	(in millions)		2014		2013
	Gains on sales and exchanges of investments, net		$	83	$	35
	Investment impairment losses			-5		-9
	Unrealized gains (losses) on securities underlying prepaid forward sale agreements			-113		605
	Mark to market adjustments on derivative component of prepaid forward sale
		agreements and indexed debt instruments		117		-602
	Interest and dividend income			28		30
	Other, net			3		13
	Investment income (loss), net		$	113	$	72
	Fair Value Method
	As of March 31, 2014, the majority of our fair value method investments were equity securities held as collateral that were related to our obligations under prepaid forward sale agreements.
	Prepaid Forward Sale Agreements
			March 31,		December 31,
	(in millions)		2014		2013
	Assets:
		Fair value equity securities held as collateral	$	2,164	$	3,959
	Liabilities:
		Obligations under prepaid forward sale agreements	$	463	$	811
		Derivative component of prepaid forward sale agreements		1,501		2,800
	Total liabilities		$	1,964	$	3,611
	During the three months ended March 31, 2014, we settled $1.5 billion of obligations under certain of our prepaid forward sale agreements by delivering equity securities. As of March 31, 2014, our remaining prepaid forward sale obligations had an estimated fair value of $2 billion. The estimated fair values are based on Level 2 inputs using 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.
	Cost Method
	AirTouch
	We hold two series of preferred stock of AirTouch Communications, Inc. (“AirTouch”), a subsidiary of Verizon Communications Inc., which are redeemable in April 2020. As of March 31, 2014, the estimated fair values of the AirTouch preferred stock and the associated liability related to the redeemable preferred shares issued by one of our consolidated subsidiaries were each $1.7 billion. The estimated fair values are based on Level 2 inputs using pricing models whose inputs are derived primarily from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument.
NBCUniversal Media, LLC [Member]	'
Investments	'
	Note 4: Investments
				March 31,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	11	$	11
	Equity Method:
		The Weather Channel		331		333
		Hulu		191		187
		Other		343		332
				865		852
	Cost Method			22		21
	Total investments		$	898	$	884

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2014
Long-Term Debt	'
	Note 6: Long-Term Debt
	As of March 31, 2014, our debt had a carrying value of $47.4 billion and an estimated fair value of $52.5 billion. The estimated fair value of our publicly traded debt is based on quoted market values for the debt. To estimate the fair value of debt for which there are no quoted market prices, we use interest rates available to us for debt with similar terms and remaining maturities.
	Debt Borrowings and Repayments
	In February 2014, we issued $1.2 billion aggregate principal amount of 3.60% senior notes due 2024 and $1 billion aggregate principal amount of 4.75% senior notes due 2044. The proceeds from this offering were used for working capital and general corporate purposes, including the repayment of a portion of our outstanding commercial paper and our $900 million aggregate principal amount of 2.10% senior notes in April 2014 at maturity.
	In January 2014, we repaid at maturity $1 billion aggregate principal amount of 5.30% senior notes due 2014. In February 2014, we repaid $1.25 billion of borrowings outstanding under NBCUniversal Enterprise Inc.'s (“NBCUniversal Enterprise”) revolving credit facility with the proceeds from $990 million of borrowings under its new commercial paper program and cash on hand.
	Revolving Credit Facilities
	As of March 31, 2014, amounts available under our consolidated revolving credit facilities, net of amounts outstanding under our commercial paper program and outstanding letters of credit, totaled $6.3 billion, which included $360 million available under NBCUniversal Enterprise's credit facility.
	Commercial Paper Program
	In February 2014, NBCUniversal Enterprise entered into a commercial paper program. The maximum borrowing capacity under this commercial paper program is $1.35 billion, and it is supported by NBCUniversal Enterprise's existing $1.35 billion revolving credit facility due March 2018. The commercial paper program is fully and unconditionally guaranteed by us and our 100% owned cable holding company subsidiaries, Comcast Cable Communications, LLC (“CCCL Parent”), Comcast MO Group, Inc. (“Comcast MO Group”), Comcast Cable Holdings, LLC (“CCH”) and Comcast MO of Delaware, LLC (“Comcast MO of Delaware”) (collectively, the “cable guarantors”). As of March 31, 2014, NBCUniversal Enterprise had $990 million face amount of commercial paper outstanding.
NBCUniversal Media, LLC [Member]	'
Long-Term Debt	'
	Note 5: Long-Term Debt
	Senior Notes and Other Debt
	As of March 31, 2014, our debt had a carrying value of $11.2 billion and an estimated fair value of $12.1 billion. The estimated fair value of our publicly traded debt is based on quoted market values for the debt. To estimate the fair value of debt for which there are no quoted market prices, we use interest rates available to us for debt with similar terms and remaining maturities.
	Cross-Guarantee Structure
	In 2013, we, Comcast and certain of Comcast's 100% owned cable holding company subsidiaries (the “cable guarantors”) entered into a series of agreements and supplemental indentures to include us as a part of Comcast's existing cross-guarantee structure. As members of the cross-guarantee structure, Comcast and the cable guarantors fully and unconditionally guarantee our public debt securities, and we fully and unconditionally guarantee all of Comcast's and the cable guarantors' public debt securities. As of March 31, 2014, we guaranteed $30.7 billion of outstanding debt securities of Comcast and the cable guarantors. We also fully and unconditionally guarantee the $6.25 billion Comcast revolving credit facility due 2017 of which no amounts were outstanding as of March 31, 2014.
	We do not, however, guarantee the obligations of NBCUniversal Enterprise with respect to its $4 billion aggregate principal amount of senior notes, $1.35 billion credit facility and associated commercial paper program, or $725 million liquidation preference of Series A cumulative preferred stock.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements	'
	Note 7: 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). Level 1 consists of financial instruments whose values are based on quoted market prices for identical financial instruments in an active market. Level 2 consists of financial instruments that are valued using models or other valuation methodologies. These models use inputs that are observable either directly or indirectly. Level 3 consists of financial instruments whose values are determined using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Our financial instruments that are accounted for at fair value on a recurring basis are presented in the table below.
	Recurring Fair Value Measures
			Fair Value as of
			31-Mar-14								31-Dec-13
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities		$	2,168	$	-	$	-	$	2,168	$	3,956
	Available-for-sale securities			151		117		11		279		389
	Interest rate swap agreements			-		101		-		101		110
	Other			-		74		1		75		81
	Total		$	2,319	$	292	$	12	$	2,623	$	4,536
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments	$	-	$	1,515	$	-	$	1,515	$	2,816
	Contractual obligation			-		-		761		761		747
	Contingent consideration			-		-		677		677		684
	Other			-		17		-		17		16
	Total		$	-	$	1,532	$	1,438	$	2,970	$	4,263
	Fair Value of Redeemable Subsidiary Preferred Stock Financial Instrument
	As of March 31, 2014, the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $750 million. The estimated fair value is based on Level 2 inputs using 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.
	Contractual Obligation and Contingent Consideration
	The fair values of the contractual obligation and contingent consideration in the table above are primarily based on certain expected future discounted cash flows, the determination of which involves the use of significant unobservable inputs. The most significant unobservable inputs we use are our estimates of the future revenue we expect to generate from certain NBCUniversal businesses, which are related to our contractual obligation, and future net tax benefits that will affect payments to GE, which are related to contingent consideration. The discount rates used in the measurements of fair value were between 5% and 13% and are based on the underlying risk associated with our estimate of future revenue and the terms of the respective contracts, and the uncertainty in the timing of our payments to GE. The fair value adjustments to contractual obligation and contingent consideration are sensitive to the assumptions related to future revenue and tax benefits, respectively, as well as to current interest rates, and therefore, the adjustments are recorded to other income (expense), net in our condensed consolidated statement of income.
	Changes in Contractual Obligation and Contingent Consideration
	(in millions)		Contractual Obligation		Contingent Consideration
	Balance, December 31, 2013	$	747	$	684
	Fair value adjustments		27		7
	Payments		-13		-14
	Balance, March 31, 2014	$	761	$	677
NBCUniversal Media, LLC [Member]	'
Fair Value Measurements	'
	Note 6: 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). Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of financial instruments and their classification within the fair value hierarchy.
	Our financial instruments that are accounted for at fair value on a recurring basis were not material for all periods presented, except for the liability associated with our contractual obligation. The fair value of the contractual obligation is primarily based on certain expected future discounted cash flows, the determination of which involves the use of significant unobservable inputs. As the inputs used are not quoted market prices or observable inputs, we classify the contractual obligation as a Level 3 financial instrument.
	The most significant unobservable inputs we use are our estimates of the future revenue we expect to generate from certain of our businesses. The discount rates used in the measurement of fair value were between 12% and 13% and are based on the underlying risk associated with our estimate of future revenue and the terms of the respective contract. The fair value adjustments to the contractual obligation is sensitive to the assumptions related to future revenue, as well as to current interest rates, and therefore, the adjustments are recorded to other income (expense), net in our condensed consolidated statement of income.
	Changes in Contractual Obligation
	(in millions)		Contractual Obligation
	Balance, December 31, 2013	$	747
	Fair value adjustments		27
	Payments		-13
	Balance, March 31, 2014	$	761

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2014
Share-Based Compensation	'
	Note 8: Share-Based Compensation
	Our share-based compensation primarily consists of awards of stock options and RSUs to certain employees and directors as part of our approach to long-term incentive compensation. Additionally, through our employee stock purchase plans, employees are able to purchase shares of Comcast Class A common stock at a discount through payroll deductions.
	In March 2014, we granted 16.4 million stock options and 5.4 million RSUs related to our annual management awards. The weighted-average fair values associated with these grants were $11.09 per stock option and $46.57 per RSU.
	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2014		2013
	Stock options	$	36	$	32
	Restricted share units		48		38
	Employee stock purchase plans		6		6
	Total	$	90	$	76
	As of March 31, 2014, we had unrecognized pretax compensation expense of $428 million and $575 million related to nonvested stock options and nonvested RSUs, respectively.
NBCUniversal Media, LLC [Member]	'
Share-Based Compensation	'
	Note 7: Share-Based Compensation
	Comcast maintains share-based compensation plans that primarily consist of awards of stock options and restricted share units (“RSUs”) to certain employees and directors as part of its approach to long-term incentive compensation. Additionally, through Comcast's employee stock purchase plans, employees are able to purchase shares of its Class A common stock at a discount through payroll deductions. Certain of our employees participate in these plans and the expense associated with their participation is settled in cash with Comcast.
	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2014		2013
	Stock options	$	3	$	3
	Restricted share units		13		7
	Employee stock purchase plans		2		2
	Total	$	18	$	12

Supplemental_Financial_Informa

Supplemental Financial Information	3 Months Ended
	Mar. 31, 2014
Supplemental Financial Information	'
	Note 9: Supplemental Financial Information
	Receivables
		March 31,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	6,645	$	6,972
	Less: Allowance for returns and customer incentives		285		375
	Less: Allowance for doubtful accounts		209		221
	Receivables, net	$	6,151	$	6,376
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	47	$	180
	Deferred gains (losses) on cash flow hedges			-50		-57
	Unrecognized gains (losses) on employee benefit obligations			71		-109
	Cumulative translation adjustments			-35		-25
	Accumulated other comprehensive income (loss), net of deferred taxes		$	33	$	-11
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2014		2013
	Net income				$	1,938	$	1,645
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				1,970		1,967
		Amortization of film and television costs				2,876		1,972
		Share-based compensation				119		102
		Noncash interest expense (income), net				42		42
		Equity in net (income) losses of investees, net				-32		-11
		Cash received from investees				18		23
		Net (gain) loss on investment activity and other				-59		-132
		Deferred income taxes				-226		-373
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Change in current and noncurrent receivables, net				195		465
		Change in film and television costs				-2,722		-1,577
		Change in accounts payable and accrued expenses related to trade creditors				82		-281
		Change in other operating assets and liabilities				285		527
	Net cash provided by operating activities				$	4,486	$	4,369
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2014		2013
	Interest	$	623	$	617
	Income taxes	$	186	$	461
	Noncash Investing and Financing Activities
	During the three months ended March 31, 2014:
	• we acquired $741 million of property and equipment and intangible assets that were accrued but unpaid
	• we recorded a liability of $585 million for a quarterly cash dividend of $0.225 per common share paid in April 2014
	• we used $1.5 billion of equity securities to settle our obligations under prepaid forward sale agreements
NBCUniversal Media, LLC [Member]	'
Supplemental Financial Information	'
	Note 8: Supplemental Financial Information
	Receivables
		March 31,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	5,172	$	5,348
	Less: Allowance for returns and customer incentives		282		372
	Less: Allowance for doubtful accounts		64		65
	Receivables, net	$	4,826	$	4,911
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2014		2013
	Deferred gains (losses) on cash flow hedges		$	-6	$	-
	Unrecognized gains (losses) on employee benefit obligations			46		-50
	Cumulative translation adjustments			-53		-37
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-13	$	-87
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2014		2013
	Net income				$	741	$	411
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				365		344
		Amortization of film and television costs				2,862		1,956
		Share-based compensation				-		7
		Equity in net (income) losses of investees, net				-18		-11
		Cash received from investees				12		15
		Net (gain) loss on investment activity and other				21		32
		Deferred income taxes				16		-17
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Change in current and noncurrent receivables, net				55		204
		Change in film and television costs				-2,714		-1,567
		Change in accounts payable and accrued expenses related to trade creditors				-117		-283
		Change in other operating assets and liabilities				-467		14
	Net cash provided by operating activities				$	756	$	1,105
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2014		2013
	Interest	$	36	$	20
	Income taxes	$	53	$	55
	Noncash Investing and Financing Activities
	During the three months ended March 31, 2014:
	• we acquired $204 million of property and equipment and intangible assets that were accrued but unpaid

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies	'
	Note 10: Commitments and Contingencies
	Contingencies
	Antitrust Cases
	We are defendants in two purported class actions originally filed in December 2003 in the United States District Courts for the District of Massachusetts and the Eastern District of Pennsylvania. The potential class in the Massachusetts case, which has been transferred to the Eastern District of Pennsylvania, is our customer base in the “Boston Cluster” area, and the potential class in the Pennsylvania case is our customer base in the “Philadelphia and Chicago Clusters,” as those terms are defined in the complaints. In each case, the plaintiffs allege that certain customer exchange transactions with other cable providers resulted in unlawful horizontal market restraints in those areas and seek damages under antitrust statutes, including treble damages.
	Classes of Chicago Cluster and Philadelphia Cluster customers were certified in October 2007 and January 2010, respectively. We appealed the class certification in the Philadelphia Cluster case to the Third Circuit Court of Appeals, which affirmed the class certification in August 2011. In June 2012, the U.S. Supreme Court granted our petition to review the Third Circuit Court of Appeals' ruling and in March 2013, the Supreme Court ruled that the class had been improperly certified and reversed the judgment of the Third Circuit. The matter has been returned to the District Court for action consistent with the Supreme Court's opinion. In August 2013, the plaintiffs in the Philadelphia Cluster case moved to certify a new, smaller class. The District Court denied our September 2013 motion to strike the plaintiffs' motion on procedural grounds. In April 2014, the District Court granted our unopposed motion to de-certify the Chicago class and the plaintiffs' unopposed motion to amend the Pennsylvania case so as to dismiss claims relating to the Chicago cluster.
	In addition, we are the defendant in 22 purported class actions filed in federal district courts throughout the country. All of these actions have been consolidated by the Judicial Panel on Multidistrict Litigation in the United States District Court for the Eastern District of Pennsylvania for pre-trial proceedings. In a consolidated complaint filed in November 2009 on behalf of all plaintiffs in the multidistrict litigation, the plaintiffs allege that we improperly “tie” the rental of set-top boxes to the provision of premium cable services in violation of Section 1 of the Sherman Antitrust Act, various state antitrust laws and unfair/deceptive trade practices acts in California, Illinois and Alabama. The plaintiffs also allege a claim for unjust enrichment and seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California, Alabama, Illinois, Pennsylvania and Washington. In January 2010, we moved to compel arbitration of the plaintiffs' claims for unjust enrichment and violations of the unfair/deceptive trade practices acts of Illinois and Alabama. In September 2010, the plaintiffs filed an amended complaint alleging violations of additional state antitrust laws and unfair/deceptive trade practices acts on behalf of new subclasses in Connecticut, Florida, Minnesota, Missouri, New Jersey, New Mexico and West Virginia. In the amended complaint, plaintiffs omitted their unjust enrichment claim, as well as their state law claims on behalf of the Alabama, Illinois and Pennsylvania subclasses. In June 2011, the plaintiffs filed another amended complaint alleging only violations of Section 1 of the Sherman Antitrust Act, antitrust law in Washington and unfair/deceptive trade practices acts in California and Washington. The plaintiffs seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California and Washington. In July 2011, we moved to compel arbitration of most of the plaintiffs' claims and to stay the remaining claims pending arbitration. The West Virginia Attorney General also filed a complaint in West Virginia state court in July 2009 alleging that we improperly “tie” the rental of set-top boxes to the provision of digital cable services in violation of the West Virginia Antitrust Act and the West Virginia Consumer Credit and Protection Act. The Attorney General also alleges a claim for unjust enrichment/restitution. We removed the case to the United States District Court for West Virginia, and it was subsequently transferred to the United States District Court for the Eastern District of Pennsylvania and consolidated with the multidistrict litigation described above. In June 2013, a comprehensive settlement agreement for all 23 cases was submitted to the District Court for preliminary approval. Regardless of whether this settlement agreement is approved, we do not expect these cases to have a material effect on our results of operations, cash flows or financial position.
	We believe the claims in each of the pending actions described above in this item are without merit, except as otherwise set forth above, and intend to defend the actions vigorously. We cannot predict the outcome of any of the actions described above, including a range of possible loss, or how the final resolution of any such actions would impact our results of operations or cash flows for any one period or our financial position. In addition, as any action nears a trial, there is an increased possibility that the action may be settled by the parties. Nevertheless, the final disposition of any of the above actions is not expected to have a material adverse effect on our consolidated financial position, but could possibly be material to our consolidated results of operations or cash flows for any one period.
	Other
	We are a defendant in several unrelated lawsuits claiming infringement of various patents relating to various aspects of our businesses. In certain of these cases other industry participants are also defendants, and also in certain of these cases we expect that any potential liability would be in part or in whole the responsibility of our equipment and technology vendors under applicable contractual indemnification provisions. We are also subject to other legal proceedings and claims that arise in the ordinary course of our business. While the amount of ultimate liability with respect to such actions is not expected to materially affect our results of operations, cash flows or financial position, any litigation resulting from any such legal proceedings or claims could be time consuming, costly and injure our reputation.

Financial_Data_by_Business_Seg

Financial Data by Business Segment	3 Months Ended
	Mar. 31, 2014
Financial Data by Business Segment	'
	Note 11: Financial Data by Business Segment
	We present our operations in five reportable business segments:
	• Cable Communications: Consists of the operations of Comcast Cable, which is the nation's largest provider of video, high-speed Internet and voice services (“cable services”) to residential customers under the XFINITY brand, and we also provide similar services to businesses and sell advertising.
	• Cable Networks: Consists primarily of our national cable networks, our regional sports networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, and our broadcast television production operations.
	• Filmed Entertainment: Consists primarily of the studio operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide.
	• Theme Parks: Consists primarily of our Universal theme parks in Orlando and Hollywood.
	In evaluating the profitability of our operating segments, the components of net income (loss) below operating income (loss) before depreciation and amortization are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.
			Three Months Ended March 31, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,757	$	4,400	$	1,584	$	2,816	$	1,145
	NBCUniversal
		Cable Networks(b)		2,505		895		189		706		11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment(b)		1,351		288		5		283		1
		Theme Parks		487		170		69		101		144
		Headquarters and Other(c)		2		-163		75		-238		124
		Eliminations(d)		-90		-1		-		-1		-
	NBCUniversal			6,876		1,311		365		946		291
	Corporate and Other			174		-153		21		-174		12
	Eliminations(d)			-399		-20		-		-20		-
	Comcast Consolidated		$	17,408	$	5,538	$	1,970	$	3,568	$	1,448
			Three Months Ended March 31, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,217	$	4,219	$	1,608	$	2,611	$	1,094
	NBCUniversal
		Cable Networks(b)		2,225		859		184		675		24
		Broadcast Television		1,517		-35		25		-60		8
		Filmed Entertainment(b)		1,216		69		4		65		2
		Theme Parks		462		173		72		101		138
		Headquarters and Other(c)		9		-112		59		-171		91
		Eliminations(d)		-89		-1		-		-1		-
	NBCUniversal			5,340		953		344		609		263
	Corporate and Other			162		-83		15		-98		4
	Eliminations(d)			-409		-55		-		-55		-
	Comcast Consolidated		$	15,310	$	5,034	$	1,967	$	3,067	$	1,361
	(a) For the three months ended March 31, 2014 and 2013, Cable Communications segment revenue was derived from the following sources:
			Three Months Ended
			31-Mar
			2014		2013
	Residential:
		Video	48.1	%	50	%
		High-speed Internet	25.6	%	24.7	%
		Voice	8.5	%	8.8	%
	Business services		8.5	%	7.2	%
	Advertising		4.8	%	4.8	%
	Other		4.5	%	4.5	%
	Total		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 the three months ended March 31, 2014 and 2013, 2.8% and 2.9%, respectively, of Cable Communications revenue was derived from franchise and other regulatory fees.
	Beginning in 2014, Fandango, our movie ticketing and entertainment business that was previously presented in our Cable Networks segment, is now presented in the Filmed Entertainment segment to reflect the change in our management reporting presentation. Due to immateriality, prior period amounts have not been adjusted. The change in presentation resulted in the reclassification of $195 million of goodwill from our Cable Networks segment to our Filmed Entertainment segment.
	NBCUniversal Headquarters and Other activities includes costs associated with overhead, allocations, personnel costs and headquarter initiatives.
	Included in Eliminations are transactions that our segments enter into with one another. The most common types of transactions are the following:
	• our Cable Networks and Broadcast Television segments generate revenue by selling programming to our Cable Communications segment, which represents a substantial majority of the revenue elimination amount
	• our Cable Communications segment 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
	• our Cable Communications segment receives incentives offered by our Cable Networks segment in connection with its distribution of the Cable Networks' content that are recorded as a reduction to programming expenses
	No single customer accounted for a significant amount of revenue in any period.
	We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses on 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]	'
Financial Data by Business Segment	'
	Note 9: Financial Data by Business Segment
	We present our operations in four reportable business segments:
	• Cable Networks: Consists primarily of our national cable networks, our regional sports networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, and our broadcast television production operations.
	• Filmed Entertainment: Consists primarily of the studio operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide.
	• Theme Parks: Consists primarily of our Universal theme parks in Orlando and Hollywood.
	In evaluating the profitability of our operating segments, the components of net income (loss) below operating income (loss) before depreciation and amortization are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.
			Three Months Ended March 31, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,505	$	895	$	189	$	706	$	11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment(a)		1,351		288		5		283		1
		Theme Parks		487		170		69		101		144
		Headquarters and Other(b)		2		-163		75		-238		124
		Eliminations(c)		-90		-1		-		-1		-
	Total		$	6,876	$	1,311	$	365	$	946	$	291
			Three Months Ended March 31, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,225	$	859	$	184	$	675	$	24
		Broadcast Television		1,517		-35		25		-60		8
		Filmed Entertainment(a)		1,216		69		4		65		2
		Theme Parks		462		173		72		101		138
		Headquarters and Other(b)		9		-112		59		-171		91
		Eliminations(c)		-89		-1		-		-1		-
	Total		$	5,340	$	953	$	344	$	609	$	263
	Beginning in 2014, Fandango, our movie ticketing and entertainment business that was previously presented in our Cable Networks segment, is now presented in the Filmed Entertainment segment to reflect the change in our current management reporting presentation. Due to immateriality, prior period amounts have not been adjusted. The change in presentation resulted in the reclassification of $195 million of goodwill from our Cable Networks segment to our Filmed Entertainment segment.
	Headquarters and Other activities include costs associated with overhead, personnel costs and headquarter initiatives.
	Included in Eliminations are transactions that our segments enter into with one another, which consist primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment.
	No single customer accounted for a significant amount of revenue in any period.
	We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses on 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 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.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2014
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Financial Information	'
	Note 12: Condensed Consolidating Financial Information
	Comcast Corporation (“Comcast Parent”), our cable guarantors and NBCUniversal Media, LLC (referred to as “NBCUniversal Media Parent” in the tables below) have fully and unconditionally guaranteed each other's debt securities. Comcast MO Group, CCH and Comcast MO of Delaware are collectively referred to as the “Combined CCHMO Parents.”
	Comcast Parent and the cable guarantors also fully and unconditionally guarantee NBCUniversal Enterprise's $4 billion aggregate principal amount of senior notes, its $1.35 billion credit facility due March 2018 and the associated commercial paper program. NBCUniversal Media Parent does not guarantee the NBCUniversal Enterprise senior notes, 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 the cable guarantors nor NBCUniversal Media Parent guarantee the Comcast Holdings ZONES due October 2029. None of Comcast Parent, the cable guarantors nor NBCUniversal Media Parent guarantee the $62 million principal amount currently outstanding of Comcast Holdings' ZONES due November 2029.
	Condensed Consolidating Balance Sheet
	31-Mar-14
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	506	$	2,548	$	-	$	3,054
		Investments		-		-		-		-		-		2,389		-		2,389
		Receivables, net		-		-		-		-		-		6,151		-		6,151
		Programming rights		-		-		-		-		-		863		-		863
		Other current assets		229		-		-		-		29		1,328		-		1,586
	Total current assets			229		-		-		-		535		13,279		-		14,043
	Film and television costs			-		-		-		-		-		5,058		-		5,058
	Investments			21		-		-		-		378		2,691		-		3,090
	Investments in and amounts due from subsidiaries eliminated upon consolidation			80,474		99,606		105,083		55,737		41,042		87,497		-469,439		-
	Property and equipment, net			213		-		-		-		-		29,375		-		29,588
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,103		-		27,103
	Other intangible assets, net			10		-		-		-		-		17,135		-		17,145
	Other noncurrent assets, net			1,114		145		-		-		101		1,937		-915		2,382
	Total assets		$	82,061	$	99,751	$	105,083	$	55,737	$	42,056	$	243,439	$	-470,354	$	157,773
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	7	$	-	$	-	$	-	$	-	$	5,527	$	-	$	5,534
		Accrued participations and residuals		-		-		-		-		-		1,256		-		1,256
		Accrued expenses and other current liabilities		1,430		266		318		21		398		5,761		-		8,194
		Current portion of long-term debt		900		-		-		-		902		1,017		-		2,819
	Total current liabilities			2,337		266		318		21		1,300		13,561		-		17,803
	Long-term debt, less current portion			26,455		130		1,827		1,504		10,232		4,433		-		44,581
	Deferred income taxes			-		758		-		-		58		31,553		-774		31,595
	Other noncurrent liabilities			2,001		-		-		-		937		8,312		-141		11,109
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,053		-		1,053
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		51,238		98,597		102,938		54,212		29,529		184,163		-469,439		51,238
	Total Comcast Corporation
		shareholders’ equity		51,268		98,597		102,938		54,212		29,529		184,163		-469,439		51,268
	Noncontrolling interests			-		-		-		-		-		364		-		364
	Total equity			51,268		98,597		102,938		54,212		29,529		184,527		-469,439		51,632
	Total liabilities and equity		$	82,061	$	99,751	$	105,083	$	55,737	$	42,056	$	243,439	$	-470,354	$	157,773
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	336	$	1,382	$	-	$	1,718
		Investments		-		-		-		-		-		3,573		-		3,573
		Receivables, net		-		-		-		-		-		6,376		-		6,376
		Programming rights		-		-		-		-		-		928		-		928
		Other current assets		237		-		-		-		35		1,208		-		1,480
	Total current assets			237		-		-		-		371		13,467		-		14,075
	Film and television costs			-		-		-		-		-		4,994		-		4,994
	Investments			11		-		-		-		374		3,385		-		3,770
	Investments in and amounts due from subsidiaries eliminated upon consolidation			79,956		97,429		102,673		54,724		40,644		85,164		-460,590		-
	Property and equipment, net			220		-		-		-		-		29,620		-		29,840
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,098		-		27,098
	Other intangible assets, net			11		-		-		-		-		17,318		-		17,329
	Other noncurrent assets, net			1,078		145		-		-		103		1,899		-882		2,343
	Total assets		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	8	$	-	$	-	$	-	$	-	$	5,520	$	-	$	5,528
		Accrued participations and residuals		-		-		-		-		-		1,239		-		1,239
	Accrued expenses and other current liabilities		1,371		266		180		47		323		6,678		-		8,865
	Current portion of long-term debt		2,351		-		-		-		903		26		-		3,280
Total current liabilities			3,730		266		180		47		1,226		13,463		-		18,912
Long-term debt, less current portion			25,170		132		1,827		1,505		10,236		5,697		-		44,567
Deferred income taxes			-		777		-		-		59		31,840		-741		31,935
Other noncurrent liabilities			1,919		-		-		-		931		8,675		-141		11,384
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		957		-		957
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		50,664		96,399		100,666		53,172		29,040		181,313		-460,590		50,664
Total Comcast Corporation shareholders’ equity			50,694		96,399		100,666		53,172		29,040		181,313		-460,590		50,694
Noncontrolling interests			-		-		-		-		-		364		-		364
Total equity			50,694		96,399		100,666		53,172		29,040		181,677		-460,590		51,058
Total liabilities and equity		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2014
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	17,408	$	-	$	17,408
	Management fee revenue		230		-		223		141		-		-		-594		-
			230		-		223		141		-		17,408		-594		17,408
Costs and Expenses:
	Programming and production		-		-		-		-		-		5,908		-		5,908
	Other operating and administrative		93		-		223		141		257		4,632		-594		4,752
	Advertising, marketing and promotion		-		-		-		-		-		1,210		-		1,210
	Depreciation		7		-		-		-		-		1,562		-		1,569
	Amortization		1		-		-		-		-		400		-		401
			101		-		223		141		257		13,712		-594		13,840
Operating income (loss)			129		-		-		-		-257		3,696		-		3,568
Other Income (Expense):
	Interest expense		-387		-3		-45		-29		-124		-54		-		-642
	Investment income (loss), net		1		3		-		-		1		108		-		113
	Equity in net income
	(losses) of investees, net		2,038		2,267		2,165		1,511		1,071		714		-9,734		32
	Other income (expense), net		-		-		-		-		-4		-11		-		-15
			1,652		2,267		2,120		1,482		944		757		-9,734		-512
Income (loss) before income taxes			1,781		2,267		2,120		1,482		687		4,453		-9,734		3,056
Income tax (expense) benefit			90		-		16		10		-5		-1,229		-		-1,118
Net income (loss)			1,871		2,267		2,136		1,492		682		3,224		-9,734		1,938
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-67		-		-67
Net income (loss) attributable
	to Comcast Corporation	$	1,871	$	2,267	$	2,136	$	1,492	$	682	$	3,157	$	-9,734	$	1,871
Comprehensive income (loss)
	attributable to Comcast Corporation	$	1,848	$	2,269	$	2,138	$	1,493	$	685	$	3,134	$	-9,719	$	1,848
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	15,310	$	-	$	15,310
	Management fee revenue		218		-		212		133		-		-		-563		-
			218		-		212		133		-		15,310		-563		15,310
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,663		-		4,663
	Other operating and administrative		98		-		212		133		225		4,361		-563		4,466
	Advertising, marketing and promotion		-		-		-		-		-		1,147		-		1,147
	Depreciation		7		-		-		-		-		1,559		-		1,566
	Amortization		1		-		-		-		-		400		-		401
			106		-		212		133		225		12,130		-563		12,243
Operating income (loss)			112		-		-		-		-225		3,180		-		3,067
Other Income (Expense):
	Interest expense		-376		-3		-78		-33		-120		-43		-		-653
	Investment income (loss), net		1		-3		-		-		-4		78		-		72
	Equity in net income (losses) of
	investees, net		1,608		1,742		1,763		1,262		709		366		-7,439		11
	Other income (expense), net		-1		-		-		-		-		74		-		73
			1,232		1,736		1,685		1,229		585		475		-7,439		-497
Income (loss) before income taxes			1,344		1,736		1,685		1,229		360		3,655		-7,439		2,570
Income tax (expense) benefit			93		2		27		11		-5		-1,053		-		-925
Net income (loss)			1,437		1,738		1,712		1,240		355		2,602		-7,439		1,645
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-208		-		-208
Net income (loss)
	attributable to Comcast Corporation	$	1,437	$	1,738	$	1,712	$	1,240	$	355	$	2,394	$	-7,439	$	1,437
Comprehensive
	income (loss) attributable to Comcast Corporation	$	1,437	$	1,738	$	1,714	$	1,240	$	333	$	2,407	$	-7,432	$	1,437
Condensed Consolidating Statement of Cash Flows
For the Three Months Ended March 31, 2014
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-96	$	-2	$	110	$	-47	$	-306	$	4,827	$	-	$	4,486
Investing Activities
	Net transactions with affiliates		1,370		2		-110		47		483		-1,792		-		-
	Capital expenditures		-		-		-		-		-		-1,448		-		-1,448
	Cash paid for intangible assets		-		-		-		-		-		-217		-		-217
	Acquisitions and construction of real estate properties		-		-		-		-		-		-		-		-
	Proceeds from sales of businesses and investments		-		-		-		-		-		300		-		300
	Purchases of investments		-10		-		-		-		-6		-21		-		-37
	Other		-		-		-		-		-		-103		-		-103
Net cash provided by (used in) investing activities			1,360		2		-110		47		477		-3,281		-		-1,505
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-1,350		-		-		-		-		986		-		-364
	Proceeds from borrowings		2,184		-		-		-		-		3		-		2,187
	Repurchases and repayments of debt		-1,000		-		-		-		-1		-1,259		-		-2,260
	Repurchases and retirements of common stock		-750		-		-		-		-		-		-		-750
	Dividends paid		-508		-		-		-		-		-		-		-508
	Issuances of common stock		20		-		-		-		-		-		-		20
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-66		-		-66
	Other		140		-		-		-		-		-44		-		96
Net cash provided by (used in) financing activities			-1,264		-		-		-		-1		-380		-		-1,645
Increase (decrease) in cash and cash equivalents			-		-		-		-		170		1,166		-		1,336
Cash and cash equivalents, beginning of period			-		-		-		-		336		1,382		-		1,718
Cash and cash equivalents, end of period		$	-		-		-		-		506		2,548		-		3,054
Condensed Consolidating Statement of Cash Flows
For the Three Months Ended March 31, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-112	$	3	$	49	$	-53	$	-227	$	4,709	$	-	$	4,369
Investing Activities
	Net transactions with affiliates		-2,480		-6		1,665		53		-1,251		2,019		-		-
	Capital expenditures		-		-		-		-		-		-1,361		-		-1,361
	Cash paid for intangible assets		-		-		-		-		-		-182		-		-182
	Acquisitions and construction of real estate properties		-		-		-		-		-		-1,311		-		-1,311
	Proceeds from sales of businesses and investments		-		-		-		-		-		74		-		74
	Purchases of investments		-		-		-		-		-1		-87		-		-88
	Other		-		3		-		-		-10		112		-		105
Net cash provided by (used in) investing activities			-2,480		-3		1,665		53		-1,262		-736		-		-2,763
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		500		-		-		-		-		-9		-		491
	Proceeds from borrowings		2,933		-		-		-		-		-		-		2,933
	Repurchases and repayments of debt		-		-		-1,714		-		-87		-10		-		-1,811
	Repurchases and retirements of common stock		-500		-		-		-		-		-		-		-500
	Dividends paid		-429		-		-		-		-		-		-		-429
	Issuances of common stock		13		-		-		-		-		-		-		13
	Purchase of NBCUniversal noncontrolling common equity interest		-		-		-		-		-3,200		-7,547		-		-10,747
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-49		-		-49
	Settlement of Station Venture liability		-		-		-		-		-		-602		-		-602
	Other		75		-		-		-		-40		-52		-		-17
Net cash provided by (used in) financing activities			2,592		-		-1,714		-		-3,327		-8,269		-		-10,718
Increase (decrease) in cash and cash equivalents			-		-		-		-		-4,816		-4,296		-		-9,112
Cash and cash equivalents, beginning of period			-		-		-		-		5,129		5,822		-		10,951
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	313	$	1,526	$	-	$	1,839

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share	'
Computation of diluted EPS	'
	Computation of Diluted EPS
			Three Months Ended March 31
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation shareholders		$	1,871	2,603	$	0.72	$	1,437	2,634	$	0.55
	Effect of dilutive securities:
	Assumed exercise or issuance of shares relating to stock
		plans			42					41
	Diluted EPS attributable to Comcast Corporation
		shareholders	$	1,871	2,645	$	0.71	$	1,437	2,675	$	0.54

Related_Party_Transactions_Tab

Related Party Transactions (Tables) (NBCUniversal Media, LLC [Member])	3 Months Ended
	Mar. 31, 2014
NBCUniversal Media, LLC [Member]	'
Related Party Transactions Condensed Financial Statements	'
	Condensed Consolidated Balance Sheet
			March 31,		December 31,
	(in millions)		2014			2013
	Transactions with Comcast and consolidated subsidiaries
		Receivables, net	$	234	$	228
		Accounts payable and accrued expenses related to trade creditors	$	43	$	56
		Accrued expenses and other current liabilities	$	9	$	37
		Note payable to Comcast	$	938	$	799
		Other noncurrent liabilities	$	383	$	383
	Condensed Consolidated Statement of Income
			Three Months Ended March 31
	(in millions)			2014		2013
	Transactions with Comcast and consolidated subsidiaries
		Revenue	$	361	$	352
		Operating costs and expenses	$	-37	$	-62
		Other income (expense)	$	-9	$	-

Film_and_Television_Costs_Tabl

Film and Television Costs (Tables)	3 Months Ended
	Mar. 31, 2014
Film and Television Costs	'
				March 31,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,480	$	1,630
		Completed, not released		40		70
		In production and in development		865		658
				2,385		2,358
	Television Costs:
		Released, less amortization		1,169		1,155
		In production and in development		363		370
				1,532		1,525
	Programming rights, less amortization			2,004		2,039
				5,921		5,922
	Less: Current portion of programming rights			863		928
	Film and television costs		$	5,058	$	4,994
NBCUniversal Media, LLC [Member]	'
Film and Television Costs	'
				March 31,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,480	$	1,630
		Completed, not released		40		70
		In production and in development		865		658
				2,385		2,358
	Television Costs:
		Released, less amortization		1,169		1,155
		In production and in development		363		370
				1,532		1,525
	Programming rights, less amortization			1,974		2,003
				5,891		5,886
	Less: Current portion of programming rights			843		903
	Film and television costs		$	5,048	$	4,983

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2014
Investment Summary	'
				March 31,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	2,448	$	4,345
	Equity Method:
		The Weather Channel		331		333
		Hulu		191		187
		Other		496		469
				1,018		989
	Cost Method:
		AirTouch		1,556		1,553
		Other		457		456
				2,013		2,009
	Total investments			5,479		7,343
	Less: Current investments			2,389		3,573
	Noncurrent investments		$	3,090	$	3,770
Investment Income (Loss), Net	'
	Investment Income (Loss), Net
			Three Months Ended
			31-Mar
	(in millions)		2014		2013
	Gains on sales and exchanges of investments, net		$	83	$	35
	Investment impairment losses			-5		-9
	Unrealized gains (losses) on securities underlying prepaid forward sale agreements			-113		605
	Mark to market adjustments on derivative component of prepaid forward sale
		agreements and indexed debt instruments		117		-602
	Interest and dividend income			28		30
	Other, net			3		13
	Investment income (loss), net		$	113	$	72
Prepaid Forward Sale Agreements	'
	Prepaid Forward Sale Agreements
			March 31,		December 31,
	(in millions)		2014		2013
	Assets:
		Fair value equity securities held as collateral	$	2,164	$	3,959
	Liabilities:
		Obligations under prepaid forward sale agreements	$	463	$	811
		Derivative component of prepaid forward sale agreements		1,501		2,800
	Total liabilities		$	1,964	$	3,611
NBCUniversal Media, LLC [Member]	'
Investment Summary	'
				March 31,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	11	$	11
	Equity Method:
		The Weather Channel		331		333
		Hulu		191		187
		Other		343		332
				865		852
	Cost Method			22		21
	Total investments		$	898	$	884

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Assets and Liabilities Measured on Recurring Basis	'
	Recurring Fair Value Measures
			Fair Value as of
			31-Mar-14								31-Dec-13
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities		$	2,168	$	-	$	-	$	2,168	$	3,956
	Available-for-sale securities			151		117		11		279		389
	Interest rate swap agreements			-		101		-		101		110
	Other			-		74		1		75		81
	Total		$	2,319	$	292	$	12	$	2,623	$	4,536
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments	$	-	$	1,515	$	-	$	1,515	$	2,816
	Contractual obligation			-		-		761		761		747
	Contingent consideration			-		-		677		677		684
	Other			-		17		-		17		16
	Total		$	-	$	1,532	$	1,438	$	2,970	$	4,263
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
	Changes in Contractual Obligation and Contingent Consideration
	(in millions)		Contractual Obligation		Contingent Consideration
	Balance, December 31, 2013	$	747	$	684
	Fair value adjustments		27		7
	Payments		-13		-14
	Balance, March 31, 2014	$	761	$	677
NBCUniversal Media, LLC [Member]	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
	Changes in Contractual Obligation
	(in millions)		Contractual Obligation
	Balance, December 31, 2013	$	747
	Fair value adjustments		27
	Payments		-13
	Balance, March 31, 2014	$	761

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Recognized Share-Based Compensation Expense	'
	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2014		2013
	Stock options	$	36	$	32
	Restricted share units		48		38
	Employee stock purchase plans		6		6
	Total	$	90	$	76
NBCUniversal Media, LLC [Member]	'
Recognized Share-Based Compensation Expense	'
	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2014		2013
	Stock options	$	3	$	3
	Restricted share units		13		7
	Employee stock purchase plans		2		2
	Total	$	18	$	12

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	3 Months Ended
	Mar. 31, 2014
Receivables	'
	Receivables
		March 31,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	6,645	$	6,972
	Less: Allowance for returns and customer incentives		285		375
	Less: Allowance for doubtful accounts		209		221
	Receivables, net	$	6,151	$	6,376
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	47	$	180
	Deferred gains (losses) on cash flow hedges			-50		-57
	Unrecognized gains (losses) on employee benefit obligations			71		-109
	Cumulative translation adjustments			-35		-25
	Accumulated other comprehensive income (loss), net of deferred taxes		$	33	$	-11
Schedule Of Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities	'
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2014		2013
	Net income				$	1,938	$	1,645
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				1,970		1,967
		Amortization of film and television costs				2,876		1,972
		Share-based compensation				119		102
		Noncash interest expense (income), net				42		42
		Equity in net (income) losses of investees, net				-32		-11
		Cash received from investees				18		23
		Net (gain) loss on investment activity and other				-59		-132
		Deferred income taxes				-226		-373
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Change in current and noncurrent receivables, net				195		465
		Change in film and television costs				-2,722		-1,577
		Change in accounts payable and accrued expenses related to trade creditors				82		-281
		Change in other operating assets and liabilities				285		527
	Net cash provided by operating activities				$	4,486	$	4,369
Cash Payments For Interest and Income Taxes	'
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2014		2013
	Interest	$	623	$	617
	Income taxes	$	186	$	461
NBCUniversal Media, LLC [Member]	'
Receivables	'
	Receivables
		March 31,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	5,172	$	5,348
	Less: Allowance for returns and customer incentives		282		372
	Less: Allowance for doubtful accounts		64		65
	Receivables, net	$	4,826	$	4,911
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2014		2013
	Deferred gains (losses) on cash flow hedges		$	-6	$	-
	Unrecognized gains (losses) on employee benefit obligations			46		-50
	Cumulative translation adjustments			-53		-37
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-13	$	-87
Schedule Of Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities	'
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2014		2013
	Net income				$	741	$	411
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				365		344
		Amortization of film and television costs				2,862		1,956
		Share-based compensation				-		7
		Equity in net (income) losses of investees, net				-18		-11
		Cash received from investees				12		15
		Net (gain) loss on investment activity and other				21		32
		Deferred income taxes				16		-17
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Change in current and noncurrent receivables, net				55		204
		Change in film and television costs				-2,714		-1,567
		Change in accounts payable and accrued expenses related to trade creditors				-117		-283
		Change in other operating assets and liabilities				-467		14
	Net cash provided by operating activities				$	756	$	1,105
Cash Payments For Interest and Income Taxes	'
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2014		2013
	Interest	$	36	$	20
	Income taxes	$	53	$	55

Financial_Data_by_Business_Seg1

Financial Data by Business Segment (Tables)	3 Months Ended
	Mar. 31, 2014
Financial Data by Business Segment	'
			Three Months Ended March 31, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,757	$	4,400	$	1,584	$	2,816	$	1,145
	NBCUniversal
		Cable Networks(b)		2,505		895		189		706		11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment(b)		1,351		288		5		283		1
		Theme Parks		487		170		69		101		144
		Headquarters and Other(c)		2		-163		75		-238		124
		Eliminations(d)		-90		-1		-		-1		-
	NBCUniversal			6,876		1,311		365		946		291
	Corporate and Other			174		-153		21		-174		12
	Eliminations(d)			-399		-20		-		-20		-
	Comcast Consolidated		$	17,408	$	5,538	$	1,970	$	3,568	$	1,448
			Three Months Ended March 31, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,217	$	4,219	$	1,608	$	2,611	$	1,094
	NBCUniversal
		Cable Networks(b)		2,225		859		184		675		24
		Broadcast Television		1,517		-35		25		-60		8
		Filmed Entertainment(b)		1,216		69		4		65		2
		Theme Parks		462		173		72		101		138
		Headquarters and Other(c)		9		-112		59		-171		91
		Eliminations(d)		-89		-1		-		-1		-
	NBCUniversal			5,340		953		344		609		263
	Corporate and Other			162		-83		15		-98		4
	Eliminations(d)			-409		-55		-		-55		-
	Comcast Consolidated		$	15,310	$	5,034	$	1,967	$	3,067	$	1,361
Cable Segment Revenue Sources	'
			Three Months Ended
			31-Mar
			2014		2013
	Residential:
		Video	48.1	%	50	%
		High-speed Internet	25.6	%	24.7	%
		Voice	8.5	%	8.8	%
	Business services		8.5	%	7.2	%
	Advertising		4.8	%	4.8	%
	Other		4.5	%	4.5	%
	Total		100	%	100	%
NBCUniversal Media, LLC [Member]	'
Financial Data by Business Segment	'
			Three Months Ended March 31, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,505	$	895	$	189	$	706	$	11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment(a)		1,351		288		5		283		1
		Theme Parks		487		170		69		101		144
		Headquarters and Other(b)		2		-163		75		-238		124
		Eliminations(c)		-90		-1		-		-1		-
	Total		$	6,876	$	1,311	$	365	$	946	$	291
			Three Months Ended March 31, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,225	$	859	$	184	$	675	$	24
		Broadcast Television		1,517		-35		25		-60		8
		Filmed Entertainment(a)		1,216		69		4		65		2
		Theme Parks		462		173		72		101		138
		Headquarters and Other(b)		9		-112		59		-171		91
		Eliminations(c)		-89		-1		-		-1		-
	Total		$	5,340	$	953	$	344	$	609	$	263

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2014
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Financial Statements	'
	Condensed Consolidating Balance Sheet
	31-Mar-14
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	506	$	2,548	$	-	$	3,054
		Investments		-		-		-		-		-		2,389		-		2,389
		Receivables, net		-		-		-		-		-		6,151		-		6,151
		Programming rights		-		-		-		-		-		863		-		863
		Other current assets		229		-		-		-		29		1,328		-		1,586
	Total current assets			229		-		-		-		535		13,279		-		14,043
	Film and television costs			-		-		-		-		-		5,058		-		5,058
	Investments			21		-		-		-		378		2,691		-		3,090
	Investments in and amounts due from subsidiaries eliminated upon consolidation			80,474		99,606		105,083		55,737		41,042		87,497		-469,439		-
	Property and equipment, net			213		-		-		-		-		29,375		-		29,588
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,103		-		27,103
	Other intangible assets, net			10		-		-		-		-		17,135		-		17,145
	Other noncurrent assets, net			1,114		145		-		-		101		1,937		-915		2,382
	Total assets		$	82,061	$	99,751	$	105,083	$	55,737	$	42,056	$	243,439	$	-470,354	$	157,773
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	7	$	-	$	-	$	-	$	-	$	5,527	$	-	$	5,534
		Accrued participations and residuals		-		-		-		-		-		1,256		-		1,256
		Accrued expenses and other current liabilities		1,430		266		318		21		398		5,761		-		8,194
		Current portion of long-term debt		900		-		-		-		902		1,017		-		2,819
	Total current liabilities			2,337		266		318		21		1,300		13,561		-		17,803
	Long-term debt, less current portion			26,455		130		1,827		1,504		10,232		4,433		-		44,581
	Deferred income taxes			-		758		-		-		58		31,553		-774		31,595
	Other noncurrent liabilities			2,001		-		-		-		937		8,312		-141		11,109
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,053		-		1,053
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		51,238		98,597		102,938		54,212		29,529		184,163		-469,439		51,238
	Total Comcast Corporation
		shareholders’ equity		51,268		98,597		102,938		54,212		29,529		184,163		-469,439		51,268
	Noncontrolling interests			-		-		-		-		-		364		-		364
	Total equity			51,268		98,597		102,938		54,212		29,529		184,527		-469,439		51,632
	Total liabilities and equity		$	82,061	$	99,751	$	105,083	$	55,737	$	42,056	$	243,439	$	-470,354	$	157,773
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	336	$	1,382	$	-	$	1,718
		Investments		-		-		-		-		-		3,573		-		3,573
		Receivables, net		-		-		-		-		-		6,376		-		6,376
		Programming rights		-		-		-		-		-		928		-		928
		Other current assets		237		-		-		-		35		1,208		-		1,480
	Total current assets			237		-		-		-		371		13,467		-		14,075
	Film and television costs			-		-		-		-		-		4,994		-		4,994
	Investments			11		-		-		-		374		3,385		-		3,770
	Investments in and amounts due from subsidiaries eliminated upon consolidation			79,956		97,429		102,673		54,724		40,644		85,164		-460,590		-
	Property and equipment, net			220		-		-		-		-		29,620		-		29,840
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,098		-		27,098
	Other intangible assets, net			11		-		-		-		-		17,318		-		17,329
	Other noncurrent assets, net			1,078		145		-		-		103		1,899		-882		2,343
	Total assets		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	8	$	-	$	-	$	-	$	-	$	5,520	$	-	$	5,528
		Accrued participations and residuals		-		-		-		-		-		1,239		-		1,239
		Accrued expenses and other current liabilities		1,371		266		180		47		323		6,678		-		8,865
		Current portion of long-term debt		2,351		-		-		-		903		26		-		3,280
	Total current liabilities			3,730		266		180		47		1,226		13,463		-		18,912
	Long-term debt, less current portion			25,170		132		1,827		1,505		10,236		5,697		-		44,567
Deferred income taxes			-		777		-		-		59		31,840		-741		31,935
Other noncurrent liabilities			1,919		-		-		-		931		8,675		-141		11,384
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		957		-		957
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		50,664		96,399		100,666		53,172		29,040		181,313		-460,590		50,664
Total Comcast Corporation shareholders’ equity			50,694		96,399		100,666		53,172		29,040		181,313		-460,590		50,694
Noncontrolling interests			-		-		-		-		-		364		-		364
Total equity			50,694		96,399		100,666		53,172		29,040		181,677		-460,590		51,058
Total liabilities and equity		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2014
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	17,408	$	-	$	17,408
	Management fee revenue		230		-		223		141		-		-		-594		-
			230		-		223		141		-		17,408		-594		17,408
Costs and Expenses:
	Programming and production		-		-		-		-		-		5,908		-		5,908
	Other operating and administrative		93		-		223		141		257		4,632		-594		4,752
	Advertising, marketing and promotion		-		-		-		-		-		1,210		-		1,210
	Depreciation		7		-		-		-		-		1,562		-		1,569
	Amortization		1		-		-		-		-		400		-		401
			101		-		223		141		257		13,712		-594		13,840
Operating income (loss)			129		-		-		-		-257		3,696		-		3,568
Other Income (Expense):
	Interest expense		-387		-3		-45		-29		-124		-54		-		-642
	Investment income (loss), net		1		3		-		-		1		108		-		113
	Equity in net income
	(losses) of investees, net		2,038		2,267		2,165		1,511		1,071		714		-9,734		32
	Other income (expense), net		-		-		-		-		-4		-11		-		-15
			1,652		2,267		2,120		1,482		944		757		-9,734		-512
Income (loss) before income taxes			1,781		2,267		2,120		1,482		687		4,453		-9,734		3,056
Income tax (expense) benefit			90		-		16		10		-5		-1,229		-		-1,118
Net income (loss)			1,871		2,267		2,136		1,492		682		3,224		-9,734		1,938
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-67		-		-67
Net income (loss) attributable
	to Comcast Corporation	$	1,871	$	2,267	$	2,136	$	1,492	$	682	$	3,157	$	-9,734	$	1,871
Comprehensive income (loss)
	attributable to Comcast Corporation	$	1,848	$	2,269	$	2,138	$	1,493	$	685	$	3,134	$	-9,719	$	1,848
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	15,310	$	-	$	15,310
	Management fee revenue		218		-		212		133		-		-		-563		-
			218		-		212		133		-		15,310		-563		15,310
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,663		-		4,663
	Other operating and administrative		98		-		212		133		225		4,361		-563		4,466
	Advertising, marketing and promotion		-		-		-		-		-		1,147		-		1,147
	Depreciation		7		-		-		-		-		1,559		-		1,566
	Amortization		1		-		-		-		-		400		-		401
			106		-		212		133		225		12,130		-563		12,243
Operating income (loss)			112		-		-		-		-225		3,180		-		3,067
Other Income (Expense):
	Interest expense		-376		-3		-78		-33		-120		-43		-		-653
	Investment income (loss), net		1		-3		-		-		-4		78		-		72
	Equity in net income (losses) of
	investees, net		1,608		1,742		1,763		1,262		709		366		-7,439		11
	Other income (expense), net		-1		-		-		-		-		74		-		73
			1,232		1,736		1,685		1,229		585		475		-7,439		-497
Income (loss) before income taxes			1,344		1,736		1,685		1,229		360		3,655		-7,439		2,570
Income tax (expense) benefit			93		2		27		11		-5		-1,053		-		-925
Net income (loss)			1,437		1,738		1,712		1,240		355		2,602		-7,439		1,645
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-208		-		-208
Net income (loss)
	attributable to Comcast Corporation	$	1,437	$	1,738	$	1,712	$	1,240	$	355	$	2,394	$	-7,439	$	1,437
Comprehensive
	income (loss) attributable to Comcast Corporation	$	1,437	$	1,738	$	1,714	$	1,240	$	333	$	2,407	$	-7,432	$	1,437
Condensed Consolidating Statement of Cash Flows
For the Three Months Ended March 31, 2014
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-96	$	-2	$	110	$	-47	$	-306	$	4,827	$	-	$	4,486
Investing Activities
	Net transactions with affiliates		1,370		2		-110		47		483		-1,792		-		-
	Capital expenditures		-		-		-		-		-		-1,448		-		-1,448
	Cash paid for intangible assets		-		-		-		-		-		-217		-		-217
	Acquisitions and construction of real estate properties		-		-		-		-		-		-		-		-
	Proceeds from sales of businesses and investments		-		-		-		-		-		300		-		300
	Purchases of investments		-10		-		-		-		-6		-21		-		-37
	Other		-		-		-		-		-		-103		-		-103
Net cash provided by (used in) investing activities			1,360		2		-110		47		477		-3,281		-		-1,505
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-1,350		-		-		-		-		986		-		-364
	Proceeds from borrowings		2,184		-		-		-		-		3		-		2,187
	Repurchases and repayments of debt		-1,000		-		-		-		-1		-1,259		-		-2,260
	Repurchases and retirements of common stock		-750		-		-		-		-		-		-		-750
	Dividends paid		-508		-		-		-		-		-		-		-508
	Issuances of common stock		20		-		-		-		-		-		-		20
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-66		-		-66
	Other		140		-		-		-		-		-44		-		96
Net cash provided by (used in) financing activities			-1,264		-		-		-		-1		-380		-		-1,645
Increase (decrease) in cash and cash equivalents			-		-		-		-		170		1,166		-		1,336
Cash and cash equivalents, beginning of period			-		-		-		-		336		1,382		-		1,718
Cash and cash equivalents, end of period		$	-		-		-		-		506		2,548		-		3,054
Condensed Consolidating Statement of Cash Flows
For the Three Months Ended March 31, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-112	$	3	$	49	$	-53	$	-227	$	4,709	$	-	$	4,369
Investing Activities
	Net transactions with affiliates		-2,480		-6		1,665		53		-1,251		2,019		-		-
	Capital expenditures		-		-		-		-		-		-1,361		-		-1,361
	Cash paid for intangible assets		-		-		-		-		-		-182		-		-182
	Acquisitions and construction of real estate properties		-		-		-		-		-		-1,311		-		-1,311
	Proceeds from sales of businesses and investments		-		-		-		-		-		74		-		74
	Purchases of investments		-		-		-		-		-1		-87		-		-88
	Other		-		3		-		-		-10		112		-		105
Net cash provided by (used in) investing activities			-2,480		-3		1,665		53		-1,262		-736		-		-2,763
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		500		-		-		-		-		-9		-		491
	Proceeds from borrowings		2,933		-		-		-		-		-		-		2,933
	Repurchases and repayments of debt		-		-		-1,714		-		-87		-10		-		-1,811
	Repurchases and retirements of common stock		-500		-		-		-		-		-		-		-500
	Dividends paid		-429		-		-		-		-		-		-		-429
	Issuances of common stock		13		-		-		-		-		-		-		13
	Purchase of NBCUniversal noncontrolling common equity interest		-		-		-		-		-3,200		-7,547		-		-10,747
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-49		-		-49
	Settlement of Station Venture liability		-		-		-		-		-		-602		-		-602
	Other		75		-		-		-		-40		-52		-		-17
Net cash provided by (used in) financing activities			2,592		-		-1,714		-		-3,327		-8,269		-		-10,718
Increase (decrease) in cash and cash equivalents			-		-		-		-		-4,816		-4,296		-		-9,112
Cash and cash equivalents, beginning of period			-		-		-		-		5,129		5,822		-		10,951
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	313	$	1,526	$	-	$	1,839

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share	'	'
Excluded shares from diluted EPS because their inclusion would have an antidilutive effect	2	2
Net income attributable to Parent	$1,871	$1,437
Basic shares attributable to Comcast Corporation shareholders	2,603	2,634
Assumed exercise or issuance of shares relating to stock plans	42	41
Diluted shares attributable to Comcast Corporation shareholders	2,645	2,675
Basic earnings per common share attributable to Comcast Corporation shareholders	$0.72	$0.55
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.71	$0.54

Significant_Transactions_Narra

Significant Transactions (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014
Significant Transactions [Line Items]	'
Percentage Of Voting Interests To Be Acquired	100.00%
Company Shares Exchanged For Each Acquiree Share	2.875
Acquiree Stockholders Percentage Ownership In Parent Company	23.00%

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014
			NBCUniversal Media, LLC [Member]	NBCUniversal Media, LLC [Member]	Nbcuniversal Holdings Preferred Stock [Member]	Carrying Value Of Related Party Contractual Obligation [Member]
					NBCUniversal Media, LLC [Member]	NBCUniversal Media, LLC [Member]
Preferred stock liquidition preference value	'	'	'	'	$9,400,000,000	'
Revolving Credit Agreement Capacity	'	'	3,000,000,000	'	'	'
Preferred stock dividend rate percentage	'	'	'	'	8.25%	'
Borrowing margin for LIBOR based borrowings	'	'	1.00%	'	'	'
Other noncurrent liabilities	$11,109,000,000	$11,384,000,000	$3,362,000,000	$3,412,000,000	'	$383,000,000

Related_Party_Transactions_Con

Related Party Transactions - Consolidated Balance Sheet (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Receivables, net	$6,151	$6,376
Accounts payable and accrued expenses related to trade creditors	5,534	5,528
Accrued expenses and other current liabilities	7,418	7,967
Other noncurrent liabilities	11,109	11,384
NBCUniversal Media, LLC [Member]	'	'
Receivables, net	4,826	4,911
Accounts payable and accrued expenses related to trade creditors	1,421	1,583
Accrued expenses and other current liabilities	1,269	1,465
Note payable to Comcast	938	799
Other noncurrent liabilities	3,362	3,412
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]	'	'
Receivables, net	234	228
Accounts payable and accrued expenses related to trade creditors	43	56
Accrued expenses and other current liabilities	9	37
Note payable to Comcast	938	799
Other noncurrent liabilities	$383	$383

Related_Party_Transactions_Con1

Related Party Transactions - Consolidated Statement of Income (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$17,408	$15,310
NBCUniversal Media, LLC [Member]	'	'
Revenue	6,876	5,340
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	361	352
Operating costs and expenses	-37	-62
Other income (expense)	($9)	'

Film_and_Television_Costs_Film

Film and Television Costs (Film and Television Costs)(Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Film And Television Costs [Line Items]	'	'
Total film costs	$2,385	$2,358
Total television costs	1,532	1,525
Programming rights, less amortization	2,004	2,039
Total film costs, television costs and programming rights	5,921	5,922
Less: Current portion of programming rights	863	928
Film and television costs	5,058	4,994
NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Programming rights, less amortization	1,974	2,003
Total film costs, television costs and programming rights	5,891	5,886
Less: Current portion of programming rights	843	903
Film and television costs	5,048	4,983
Film Costs [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,480	1,630
Completed, not released	40	70
In production and in development	865	658
Film Costs [Member] | NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,480	1,630
Completed, not released	40	70
In production and in development	865	658
Total film costs	2,385	2,358
Television Costs [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,169	1,155
In production and in development	363	370
Television Costs [Member] | NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,169	1,155
In production and in development	363	370
Total television costs	$1,532	$1,525

Investments_Details

Investments (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair value method	$2,448	$4,345
Equity method	1,018	989
Cost method	2,013	2,009
Total Investments	5,479	7,343
Less: Current investments	2,389	3,573
Noncurrent investments	3,090	3,770
NBCUniversal Media, LLC [Member]	'	'
Fair value method	11	11
Equity method	865	852
Cost method	22	21
Total Investments	898	884
Other Equity Method Investments [Member]	'	'
Equity method	496	469
Other Equity Method Investments [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	343	332
Air Touch [Member]	'	'
Cost method	1,556	1,553
Other Cost Method Investment [Member]	'	'
Cost method	457	456
The Weather Channel [Member]	'	'
Equity method	331	333
The Weather Channel [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	331	333
Hulu [Member]	'	'
Equity method	191	187
Hulu [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	$191	$187

Investments_Investment_Income_

Investments (Investment Income (Loss), Net) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Gains on sales and exchanges of investments, net	$83	$35
Investment impairment losses	-5	-9
Unrealized gains (losses) on securities underlying prepaid forward sale agreements	-113	605
Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments	117	-602
Interest and dividend income	28	30
Other, net	3	13
Investment income (loss), net	113	72
NBCUniversal Media, LLC [Member]	'	'
Investment income (loss), net	$6	$3

Investments_Fair_Value_Method_

Investments (Fair Value Method Investments) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair value equity securities held as collateral	$2,164,000,000	$3,959,000,000
Obligations under prepaid forward sale agreements	463,000,000	811,000,000
Derivative component of prepaid forward sale agreements	1,501,000,000	2,800,000,000
Total liabilities associated with prepaid forward sale agreements	1,964,000,000	3,611,000,000
Prepaid forward sale obligations fair value	2,000,000,000	'
Prepaid Forward Obligations Settlement	$1,500,000,000	'

Investments_Cost_Method_Invest

Investments (Cost Method Investments) (Details) (Air Touch [Member], USD $)	Mar. 31, 2014
Air Touch [Member]	'
Fair value of AirTouch preferred stock related to redeemable preferred shares	$1,700,000,000
Fair value amount of redeemable preferred stock	$1,700,000,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Total debt	$47,400,000,000	'
Long-term Debt, Fair Value	52,500,000,000	'
Amounts available under revolving credit facilities	6,300,000,000	'
Repurchases and repayments of debt	2,260,000,000	1,811,000,000
Holding company ownership in subsidiaries	100.00%	'
Proceeds from (repayments of) short-term borrowings, net	-364,000,000	491,000,000
NBCUniversal Media, LLC [Member]	'	'
Total debt	11,200,000,000	'
Long-term Debt, Fair Value	12,100,000,000	'
Holding company ownership in subsidiaries	100.00%	'
Related Party Aggregate Principal Amount Senior Notes Not Subject To Guarantee	4,000,000,000	'
Related Party Credit Facility Not Subject To Guarantee	1,350,000,000	'
Related Party Liquidation Preference Preferred Stock Not Subject To Guarantee	725,000,000	'
NBCUniversal Enterprise Credit Facility	'	'
Debt Instrument, Maturity Date, Description	'March 2018	'
Credit facility borrowing capacity	1,350,000,000	'
Amounts available under revolving credit facilities	360,000,000	'
Repurchases and repayments of debt	1,250,000,000	'
Comcast And Comcast Cable Communications LLC [Member] | NBCUniversal Media, LLC [Member]	'	'
Debt Instrument, Maturity Date, Description	' 2017	'
Guarantee Obligations Current Principal Balance	30,700,000,000	'
Guarantee Obligations Revolving Credit Facility	6,250,000,000	'
NBCUniversal Enterprise [Member]	'	'
Commercial paper	990,000,000	'
Proceeds from (repayments of) short-term borrowings, net	990,000,000	'
NBCUniversal Enterprise Commercial Paper [Member]	'	'
Credit facility borrowing capacity	1,350,000,000	'
Senior 3.60% Notes Due 2024 [Member]	'	'
Principal amount	1,200,000,000	'
Interest rate	3.60%	'
Debt Instrument, Maturity Date, Description	'2024	'
Senior 4.75% Notes Due 2044 [Member]	'	'
Principal amount	1,000,000,000	'
Interest rate	4.75%	'
Debt Instrument, Maturity Date, Description	'2044	'
Senior 5.3% Notes Due 2014 [Member]	'	'
Interest rate	5.30%	'
Debt Instrument, Maturity Date, Description	'2014	'
Repurchases and repayments of debt	1,000,000,000	'
Senior 2.1% Notes Due 2014 [Member]	'	'
Principal amount	$900,000,000	'
Interest rate	2.10%	'
Debt Instrument, Maturity Date, Description	'April 2014	'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Trading securities	$2,168	$3,956
Available-for-sale Securities	279	389
Interest rate swap agreements	101	110
Other [assets]	75	81
Fair value, assets measured on recurring basis, total	2,623	4,536
Derivative component of prepaid forward sale agreements and indexed debt instruments	1,515	2,816
Contractual obligation	761	747
Contingent consideration	677	684
Other [liabilities]	17	16
Fair value liabilities measured on recurring basis	2,970	4,263
Fair Value, Inputs, Level 1 [Member]	'	'
Trading securities	2,168	'
Available-for-sale Securities	151	'
Fair value, assets measured on recurring basis, total	2,319	'
Fair Value, Inputs, Level 2 [Member]	'	'
Available-for-sale Securities	117	'
Interest rate swap agreements	101	'
Other [assets]	74	'
Fair value, assets measured on recurring basis, total	292	'
Derivative component of prepaid forward sale agreements and indexed debt instruments	1,515	'
Other [liabilities]	17	'
Fair value liabilities measured on recurring basis	1,532	'
Fair Value, Inputs, Level 3 [Member]	'	'
Available-for-sale Securities	11	'
Other [assets]	1	'
Fair value, assets measured on recurring basis, total	12	'
Contractual obligation	761	'
Contingent consideration	677	'
Fair value liabilities measured on recurring basis	$1,438	'

Fair_Value_Disclosure_Rollforw

Fair Value Disclosure Rollforward (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014
Discount rate used to determine fair value, minimum	5.00%
Discount rate used to determine fair value, maximum	13.00%
NBCUniversal Media, LLC [Member]	'
Discount rate used to determine fair value, minimum	12.00%
Discount rate used to determine fair value, maximum	13.00%
NBCUniversal Enterprise [Member]	'
Fair Value Amount Of Redeemable Preferred Stock	$750
Contractual Obligation [Member]	'
Beginning balance	747
Fair value adjustments	27
Payments	-13
Ending balance	761
Contractual Obligation [Member] | NBCUniversal Media, LLC [Member]	'
Beginning balance	747
Fair value adjustments	27
Payments	-13
Ending balance	761
Contingent Consideration [Member]	'
Beginning balance	684
Fair value adjustments	7
Payments	-14
Ending balance	$677

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014
Number of stock options granted	16.4
Number of restricted share units granted	5.4
Weighted average fair value of stock options granted	$11.09
Weighed average fair value of restricted share units granted	$46.57
Stock Options [Member]	'
Unrecognized pretax compensation expense on nonvested awards	$428
Restricted Share Units [Member]	'
Unrecognized pretax compensation expense on nonvested awards	$575

ShareBased_Compensation_Recogn

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Recognized share-based compensation expense	$90	$76
NBCUniversal Media, LLC [Member]	'	'
Recognized share-based compensation expense	18	12
Stock Options [Member]	'	'
Recognized share-based compensation expense	36	32
Stock Options [Member] | NBCUniversal Media, LLC [Member]	'	'
Recognized share-based compensation expense	3	3
Restricted Share Units [Member]	'	'
Recognized share-based compensation expense	48	38
Restricted Share Units [Member] | NBCUniversal Media, LLC [Member]	'	'
Recognized share-based compensation expense	13	7
Employee Stock Purchase Plan [Member]	'	'
Recognized share-based compensation expense	6	6
Employee Stock Purchase Plan [Member] | NBCUniversal Media, LLC [Member]	'	'
Recognized share-based compensation expense	$2	$2

Supplemental_Financial_Informa2

Supplemental Financial Information (Receivables)(Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Receivables, gross	$6,645	$6,972
Less: Allowance for returns and customer incentives	285	375
Less: Allowance for doubtful accounts	209	221
Receivables, net	6,151	6,376
NBCUniversal Media, LLC [Member]	'	'
Receivables, gross	5,172	5,348
Less: Allowance for returns and customer incentives	282	372
Less: Allowance for doubtful accounts	64	65
Receivables, net	$4,826	$4,911

Supplemental_Financial_Informa3

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Millions, unless otherwise specified
Unrealized gains (losses) on marketable securities	$47	'	$180
Deferred gains (losses) on cash flow hedges	-50	'	-57
Unrecognized gains (losses) on employee benefit obligations	71	'	-109
Cumulative translation adjustments	-35	'	-25
Accumulated other comprehensive income (loss), net of deferred taxes	33	56	-11
NBCUniversal Media, LLC [Member]	'	'	'
Deferred gains (losses) on cash flow hedges	-6	'	'
Unrecognized gains (losses) on employee benefit obligations	46	'	-50
Cumulative translation adjustments	-53	'	-37
Accumulated other comprehensive income (loss), net of deferred taxes	($13)	($16)	($87)

Supplemental_Financial_Informa4

Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net income	$1,938	$1,645
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	1,970	1,967
Amortization Of Film And Television Costs	2,876	1,972
Share-based compensation	119	102
Noncash interest expense (income), net	42	42
Equity in net (income) losses of investees, net	-32	-11
Cash received from investees	18	23
Net (gain) loss on investment activity and other	-59	-132
Deferred income taxes	-226	-373
Change in current and noncurrent receivables, net	195	465
Change in film and television costs	-2,722	-1,577
Change in accounts payable and accrued expenses related to trade creditors	82	-281
Change in other operating assets and liabilities	285	527
Net cash provided by (used in) operating activities	4,486	4,369
NBCUniversal Media, LLC [Member]	'	'
Net income	741	411
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	365	344
Amortization Of Film And Television Costs	2,862	1,956
Share-based compensation	'	7
Equity in net (income) losses of investees, net	-18	-11
Cash received from investees	12	15
Net (gain) loss on investment activity and other	21	32
Deferred income taxes	16	-17
Change in current and noncurrent receivables, net	55	204
Change in film and television costs	-2,714	-1,567
Change in accounts payable and accrued expenses related to trade creditors	-117	-283
Change in other operating assets and liabilities	-467	14
Net cash provided by (used in) operating activities	$756	$1,105

Supplemental_Financial_Informa5

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Interest	$623	$617
Income taxes	186	461
NBCUniversal Media, LLC [Member]	'	'
Interest	36	20
Income taxes	$53	$55

Supplemental_Financial_Informa6

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Dividends payable, amount	$585,000,000
Dividends payable, amount per share	$0.23
Capital expenditures incurred but not yet paid	741,000,000
Fair Value Equity Securities Settlement	1,500,000,000
NBCUniversal Media, LLC [Member]	'
Capital expenditures incurred but not yet paid	$204,000,000

Financial_Data_by_Business_Seg2

Financial Data by Business Segment (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue	$17,408	$15,310
Operating income (loss) before depreciation and amortization	5,538	5,034
Depreciation and amortization	1,970	1,967
Operating income (loss)	3,568	3,067
Capital expenditures	1,448	1,361
NBCUniversal Media, LLC [Member]	'	'
Revenue	6,876	5,340
Operating income (loss) before depreciation and amortization	1,311	953
Depreciation and amortization	365	344
Operating income (loss)	946	609
Capital expenditures	291	263
Cable Communications [Member]	'	'
Revenue	10,757	10,217
Operating income (loss) before depreciation and amortization	4,400	4,219
Depreciation and amortization	1,584	1,608
Operating income (loss)	2,816	2,611
Capital expenditures	1,145	1,094
Cable segment revenue types as percentage of total cable revenue	100.00%	100.00%
Cable Networks [Member]	'	'
Revenue	2,505	2,225
Operating income (loss) before depreciation and amortization	895	859
Depreciation and amortization	189	184
Operating income (loss)	706	675
Capital expenditures	11	24
Cable Networks [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	2,505	2,225
Operating income (loss) before depreciation and amortization	895	859
Depreciation and amortization	189	184
Operating income (loss)	706	675
Capital expenditures	11	24
Broadcast Television [Member]	'	'
Revenue	2,621	1,517
Operating income (loss) before depreciation and amortization	122	-35
Depreciation and amortization	27	25
Operating income (loss)	95	-60
Capital expenditures	11	8
Broadcast Television [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	2,621	1,517
Operating income (loss) before depreciation and amortization	122	-35
Depreciation and amortization	27	25
Operating income (loss)	95	-60
Capital expenditures	11	8
Filmed Entertainment [Member]	'	'
Revenue	1,351	1,216
Operating income (loss) before depreciation and amortization	288	69
Depreciation and amortization	5	4
Operating income (loss)	283	65
Capital expenditures	1	2
Goodwill adjustment	195	'
Filmed Entertainment [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	1,351	1,216
Operating income (loss) before depreciation and amortization	288	69
Depreciation and amortization	5	4
Operating income (loss)	283	65
Capital expenditures	1	2
Goodwill adjustment	195	'
Theme Parks [Member]	'	'
Revenue	487	462
Operating income (loss) before depreciation and amortization	170	173
Depreciation and amortization	69	72
Operating income (loss)	101	101
Capital expenditures	144	138
Theme Parks [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	487	462
Operating income (loss) before depreciation and amortization	170	173
Depreciation and amortization	69	72
Operating income (loss)	101	101
Capital expenditures	144	138
Headquarters And Other [Member]	'	'
Revenue	2	9
Operating income (loss) before depreciation and amortization	-163	-112
Depreciation and amortization	75	59
Operating income (loss)	-238	-171
Capital expenditures	124	91
Headquarters And Other [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	2	9
Operating income (loss) before depreciation and amortization	-163	-112
Depreciation and amortization	75	59
Operating income (loss)	-238	-171
Capital expenditures	124	91
NBCUniversal Eliminations [Member]	'	'
Revenue	-90	-89
Operating income (loss) before depreciation and amortization	-1	-1
Operating income (loss)	-1	-1
NBCUniversal Eliminations [Member] | NBCUniversal Media, LLC [Member]	'	'
Revenue	-90	-89
Operating income (loss) before depreciation and amortization	-1	-1
Operating income (loss)	-1	-1
NBCUniversal [Member]	'	'
Revenue	6,876	5,340
Operating income (loss) before depreciation and amortization	1,311	953
Depreciation and amortization	365	344
Operating income (loss)	946	609
Capital expenditures	291	263
Corporate and Other [Member]	'	'
Revenue	174	162
Operating income (loss) before depreciation and amortization	-153	-83
Depreciation and amortization	21	15
Operating income (loss)	-174	-98
Capital expenditures	12	4
Eliminations [Member]	'	'
Revenue	-399	-409
Operating income (loss) before depreciation and amortization	-20	-55
Operating income (loss)	($20)	($55)
Cable Communications Segment Revenue Percentage-Video [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	48.10%	50.00%
Cable Communications Segment Revenue Percentage - High-speed Internet [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	25.60%	24.70%
Cable Communications Segment Revenue Percentage- Voice [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	8.50%	8.80%
Cable Communications Segment Revenue Percentage- Business Services [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	8.50%	7.20%
Cable Communications Segment Revenue Percentage- Advertising [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	4.80%	4.80%
Cable Communications Segment Revenue Percentage- Other [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	4.50%	4.50%
Cable Communications Segment Revenue Percentage- Franchise and other regulatory fees [Member]	'	'
Cable segment revenue types as percentage of total cable revenue	2.80%	2.90%

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information (Narrative) (Details) (USD $)	Mar. 31, 2014
Comcast Holdings' ZONES due October 2029 [Member]	'
Principal amount of debt securities subject to guarantee	$185,000,000
Comcast Holdings' ZONES due November 2029 [Member]	'
Principal amount of debt securities not subject to guarantee	62,000,000
NBCUniversal Enterprise Credit Facility	'
Credit facility borrowing capacity	1,350,000,000
NBCUniversal Enterprise [Member]	'
Principal amount of debt securities subject to guarantee	$4,000,000,000

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Cash and cash equivalents	$3,054	$1,718	$1,839	$10,951
Investments [Current]	2,389	3,573	'	'
Receivables, net	6,151	6,376	'	'
Programming rights	863	928	'	'
Other current assets	1,586	1,480	'	'
Total current assets	14,043	14,075	'	'
Film and television costs	5,058	4,994	'	'
Investments	3,090	3,770	'	'
Property and equipment, net	29,588	29,840	'	'
Franchise rights	59,364	59,364	'	'
Goodwill	27,103	27,098	'	'
Other intangible assets, net	17,145	17,329	'	'
Other noncurrent assets, net	2,382	2,343	'	'
Total assets	157,773	158,813	'	'
Accounts payable and accrued expenses related to trade creditors	5,534	5,528	'	'
Accrued participations and residuals	1,256	1,239	'	'
Accrued expenses and other current liabilities [condensed]	8,194	8,865	'	'
Current portion of long-term debt	2,819	3,280	'	'
Total current liabilities	17,803	18,912	'	'
Long-term debt, less current portion	44,581	44,567	'	'
Deferred income taxes	31,595	31,935	'	'
Other noncurrent liabilities	11,109	11,384	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,053	957	'	'
Common stock	30	30	'	'
Other shareholders' equity	51,238	50,664	'	'
Total Parent Company equity	51,268	50,694	'	'
Noncontrolling interests	364	364	'	'
Total equity	51,632	51,058	48,651	49,796
Total liabilities and equity	157,773	158,813	'	'
Comcast [Member]	'	'	'	'
Other current assets	229	237	'	'
Total current assets	229	237	'	'
Investments	21	11	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	80,474	79,956	'	'
Property and equipment, net	213	220	'	'
Other intangible assets, net	10	11	'	'
Other noncurrent assets, net	1,114	1,078	'	'
Total assets	82,061	81,513	'	'
Accounts payable and accrued expenses related to trade creditors	7	8	'	'
Accrued expenses and other current liabilities [condensed]	1,430	1,371	'	'
Current portion of long-term debt	900	2,351	'	'
Total current liabilities	2,337	3,730	'	'
Long-term debt, less current portion	26,455	25,170	'	'
Other noncurrent liabilities	2,001	1,919	'	'
Common stock	30	30	'	'
Other shareholders' equity	51,238	50,664	'	'
Total Parent Company equity	51,268	50,694	'	'
Total equity	51,268	50,694	'	'
Total liabilities and equity	82,061	81,513	'	'
Comcast Holdings [Member]	'	'	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	99,606	97,429	'	'
Other noncurrent assets, net	145	145	'	'
Total assets	99,751	97,574	'	'
Accrued expenses and other current liabilities [condensed]	266	266	'	'
Total current liabilities	266	266	'	'
Long-term debt, less current portion	130	132	'	'
Deferred income taxes	758	777	'	'
Other shareholders' equity	98,597	96,399	'	'
Total Parent Company equity	98,597	96,399	'	'
Total equity	98,597	96,399	'	'
Total liabilities and equity	99,751	97,574	'	'
CCCL Parent [Member]	'	'	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	105,083	102,673	'	'
Total assets	105,083	102,673	'	'
Accrued expenses and other current liabilities [condensed]	318	180	'	'
Total current liabilities	318	180	'	'
Long-term debt, less current portion	1,827	1,827	'	'
Other shareholders' equity	102,938	100,666	'	'
Total Parent Company equity	102,938	100,666	'	'
Total equity	102,938	100,666	'	'
Total liabilities and equity	105,083	102,673	'	'
Combined CCHMO Parents [Member]	'	'	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	55,737	54,724	'	'
Total assets	55,737	54,724	'	'
Accrued expenses and other current liabilities [condensed]	21	47	'	'
Total current liabilities	21	47	'	'
Long-term debt, less current portion	1,504	1,505	'	'
Other shareholders' equity	54,212	53,172	'	'
Total Parent Company equity	54,212	53,172	'	'
Total equity	54,212	53,172	'	'
Total liabilities and equity	55,737	54,724	'	'
NBCUniversal Media Parent [Member]	'	'	'	'
Cash and cash equivalents	506	336	313	5,129
Other current assets	29	35	'	'
Total current assets	535	371	'	'
Investments	378	374	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	41,042	40,644	'	'
Other noncurrent assets, net	101	103	'	'
Total assets	42,056	41,492	'	'
Accrued expenses and other current liabilities [condensed]	398	323	'	'
Current portion of long-term debt	902	903	'	'
Total current liabilities	1,300	1,226	'	'
Long-term debt, less current portion	10,232	10,236	'	'
Deferred income taxes	58	59	'	'
Other noncurrent liabilities	937	931	'	'
Other shareholders' equity	29,529	29,040	'	'
Total Parent Company equity	29,529	29,040	'	'
Total equity	29,529	29,040	'	'
Total liabilities and equity	42,056	41,492	'	'
Comcast Non-Guarantor Subsidiaries [Member]	'	'	'	'
Cash and cash equivalents	2,548	1,382	1,526	5,822
Investments [Current]	2,389	3,573	'	'
Receivables, net	6,151	6,376	'	'
Programming rights	863	928	'	'
Other current assets	1,328	1,208	'	'
Total current assets	13,279	13,467	'	'
Film and television costs	5,058	4,994	'	'
Investments	2,691	3,385	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	87,497	85,164	'	'
Property and equipment, net	29,375	29,620	'	'
Franchise rights	59,364	59,364	'	'
Goodwill	27,103	27,098	'	'
Other intangible assets, net	17,135	17,318	'	'
Other noncurrent assets, net	1,937	1,899	'	'
Total assets	243,439	242,309	'	'
Accounts payable and accrued expenses related to trade creditors	5,527	5,520	'	'
Accrued participations and residuals	1,256	1,239	'	'
Accrued expenses and other current liabilities [condensed]	5,761	6,678	'	'
Current portion of long-term debt	1,017	26	'	'
Total current liabilities	13,561	13,463	'	'
Long-term debt, less current portion	4,433	5,697	'	'
Deferred income taxes	31,553	31,840	'	'
Other noncurrent liabilities	8,312	8,675	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,053	957	'	'
Other shareholders' equity	184,163	181,313	'	'
Total Parent Company equity	184,163	181,313	'	'
Noncontrolling interests	364	364	'	'
Total equity	184,527	181,677	'	'
Total liabilities and equity	243,439	242,309	'	'
Elimination and Consolidation Adjustments [Member]	'	'	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	-469,439	-460,590	'	'
Other noncurrent assets, net	-915	-882	'	'
Total assets	-470,354	-461,472	'	'
Deferred income taxes	-774	-741	'	'
Other noncurrent liabilities	-141	-141	'	'
Other shareholders' equity	-469,439	-460,590	'	'
Total Parent Company equity	-469,439	-460,590	'	'
Total equity	-469,439	-460,590	'	'
Total liabilities and equity	($470,354)	($461,472)	'	'

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Service revenue	$17,408	$15,310
Revenue	17,408	15,310
Programming and production	5,908	4,663
Other operating and administrative	4,752	4,466
Advertising, marketing and promotion	1,210	1,147
Depreciation	1,569	1,566
Amortization	401	401
Costs and expenses, total	13,840	12,243
Operating income (loss)	3,568	3,067
Interest expense	-642	-653
Investment income (loss), net	113	72
Equity in net income (losses) of investees, net	32	11
Other income (expense), net	-15	73
Nonoperating income (Expense), Total	-512	-497
Income (loss) before income taxes	3,056	2,570
Income tax (expense) benefit	-1,118	-925
Net income (loss)	1,938	1,645
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-67	-208
Net income (loss) attributable to Parent	1,871	1,437
Comprehensive income attributable to Parent	1,848	1,437
Comcast [Member]	'	'
Management fee revenue	230	218
Revenue	230	218
Other operating and administrative	93	98
Depreciation	7	7
Amortization	1	1
Costs and expenses, total	101	106
Operating income (loss)	129	112
Interest expense	-387	-376
Investment income (loss), net	1	1
Equity in net income (losses) of investees, net	2,038	1,608
Other income (expense), net	'	-1
Nonoperating income (Expense), Total	1,652	1,232
Income (loss) before income taxes	1,781	1,344
Income tax (expense) benefit	90	93
Net income (loss)	1,871	1,437
Net income (loss) attributable to Parent	1,871	1,437
Comprehensive income attributable to Parent	1,848	1,437
Comcast Holdings [Member]	'	'
Interest expense	-3	-3
Investment income (loss), net	3	-3
Equity in net income (losses) of investees, net	2,267	1,742
Nonoperating income (Expense), Total	2,267	1,736
Income (loss) before income taxes	2,267	1,736
Income tax (expense) benefit	'	2
Net income (loss)	2,267	1,738
Net income (loss) attributable to Parent	2,267	1,738
Comprehensive income attributable to Parent	2,269	1,738
CCCL Parent [Member]	'	'
Management fee revenue	223	212
Revenue	223	212
Other operating and administrative	223	212
Costs and expenses, total	223	212
Interest expense	-45	-78
Equity in net income (losses) of investees, net	2,165	1,763
Nonoperating income (Expense), Total	2,120	1,685
Income (loss) before income taxes	2,120	1,685
Income tax (expense) benefit	16	27
Net income (loss)	2,136	1,712
Net income (loss) attributable to Parent	2,136	1,712
Comprehensive income attributable to Parent	2,138	1,714
Combined CCHMO Parents [Member]	'	'
Management fee revenue	141	133
Revenue	141	133
Other operating and administrative	141	133
Costs and expenses, total	141	133
Interest expense	-29	-33
Equity in net income (losses) of investees, net	1,511	1,262
Nonoperating income (Expense), Total	1,482	1,229
Income (loss) before income taxes	1,482	1,229
Income tax (expense) benefit	10	11
Net income (loss)	1,492	1,240
Net income (loss) attributable to Parent	1,492	1,240
Comprehensive income attributable to Parent	1,493	1,240
NBCUniversal Media Parent [Member]	'	'
Other operating and administrative	257	225
Costs and expenses, total	257	225
Operating income (loss)	-257	-225
Interest expense	-124	-120
Investment income (loss), net	1	-4
Equity in net income (losses) of investees, net	1,071	709
Other income (expense), net	-4	'
Nonoperating income (Expense), Total	944	585
Income (loss) before income taxes	687	360
Income tax (expense) benefit	-5	-5
Net income (loss)	682	355
Net income (loss) attributable to Parent	682	355
Comprehensive income attributable to Parent	685	333
Comcast Non-Guarantor Subsidiaries [Member]	'	'
Service revenue	17,408	15,310
Revenue	17,408	15,310
Programming and production	5,908	4,663
Other operating and administrative	4,632	4,361
Advertising, marketing and promotion	1,210	1,147
Depreciation	1,562	1,559
Amortization	400	400
Costs and expenses, total	13,712	12,130
Operating income (loss)	3,696	3,180
Interest expense	-54	-43
Investment income (loss), net	108	78
Equity in net income (losses) of investees, net	714	366
Other income (expense), net	-11	74
Nonoperating income (Expense), Total	757	475
Income (loss) before income taxes	4,453	3,655
Income tax (expense) benefit	-1,229	-1,053
Net income (loss)	3,224	2,602
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-67	-208
Net income (loss) attributable to Parent	3,157	2,394
Comprehensive income attributable to Parent	3,134	2,407
Elimination and Consolidation Adjustments [Member]	'	'
Management fee revenue	-594	-563
Revenue	-594	-563
Other operating and administrative	-594	-563
Costs and expenses, total	-594	-563
Equity in net income (losses) of investees, net	-9,734	-7,439
Nonoperating income (Expense), Total	-9,734	-7,439
Income (loss) before income taxes	-9,734	-7,439
Net income (loss)	-9,734	-7,439
Net income (loss) attributable to Parent	-9,734	-7,439
Comprehensive income attributable to Parent	($9,719)	($7,432)

Condensed_Consolidating_Financ5

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating Activities	'	'
Net cash provided by (used in) operating activities	$4,486	$4,369
Investing Activities	'	'
Capital expenditures	-1,448	-1,361
Cash paid for intangible assets	-217	-182
Acquisitions and construction of real estate properties	'	-1,311
Proceeds from sales of businesses and investments	300	74
Purchases of investments	-37	-88
Other	-103	105
Net cash provided by (used in) investing activities	-1,505	-2,763
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-364	491
Proceeds from borrowings	2,187	2,933
Repurchases and repayments of debt	-2,260	-1,811
Repurchases and retirements of common stock	-750	-500
Dividends paid	-508	-429
Issuances of common stock	20	13
Purchase of NBCUniversal noncontrolling common equity interest	'	-10,747
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-66	-49
Settlement of Station Venture liability	'	-602
Other	96	-17
Net cash provided by (used in) financing activities	-1,645	-10,718
Increase (decrease) in cash and cash equivalents	1,336	-9,112
Cash and cash equivalents, beginning of period	1,718	10,951
Cash and cash equivalents, end of period	3,054	1,839
Comcast [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	-96	-112
Investing Activities	'	'
Net transactions with affiliates	1,370	-2,480
Purchases of investments	-10	'
Net cash provided by (used in) investing activities	1,360	-2,480
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-1,350	500
Proceeds from borrowings	2,184	2,933
Repurchases and repayments of debt	-1,000	'
Repurchases and retirements of common stock	-750	-500
Dividends paid	-508	-429
Issuances of common stock	20	13
Other	140	75
Net cash provided by (used in) financing activities	-1,264	2,592
Comcast Holdings [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	-2	3
Investing Activities	'	'
Net transactions with affiliates	2	-6
Other	'	3
Net cash provided by (used in) investing activities	2	-3
CCCL Parent [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	110	49
Investing Activities	'	'
Net transactions with affiliates	-110	1,665
Net cash provided by (used in) investing activities	-110	1,665
Financing Activities	'	'
Repurchases and repayments of debt	'	-1,714
Net cash provided by (used in) financing activities	'	-1,714
Combined CCHMO Parents [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	-47	-53
Investing Activities	'	'
Net transactions with affiliates	47	53
Net cash provided by (used in) investing activities	47	53
NBCUniversal Media Parent [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	-306	-227
Investing Activities	'	'
Net transactions with affiliates	483	-1,251
Purchases of investments	-6	-1
Other	'	-10
Net cash provided by (used in) investing activities	477	-1,262
Financing Activities	'	'
Repurchases and repayments of debt	-1	-87
Purchase of NBCUniversal noncontrolling common equity interest	'	-3,200
Other	'	-40
Net cash provided by (used in) financing activities	-1	-3,327
Increase (decrease) in cash and cash equivalents	170	-4,816
Cash and cash equivalents, beginning of period	336	5,129
Cash and cash equivalents, end of period	506	313
Comcast Non-Guarantor Subsidiaries [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	4,827	4,709
Investing Activities	'	'
Net transactions with affiliates	-1,792	2,019
Capital expenditures	-1,448	-1,361
Cash paid for intangible assets	-217	-182
Acquisitions and construction of real estate properties	'	-1,311
Proceeds from sales of businesses and investments	300	74
Purchases of investments	-21	-87
Other	-103	112
Net cash provided by (used in) investing activities	-3,281	-736
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	986	-9
Proceeds from borrowings	3	'
Repurchases and repayments of debt	-1,259	-10
Purchase of NBCUniversal noncontrolling common equity interest	'	-7,547
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-66	-49
Settlement of Station Venture liability	'	-602
Other	-44	-52
Net cash provided by (used in) financing activities	-380	-8,269
Increase (decrease) in cash and cash equivalents	1,166	-4,296
Cash and cash equivalents, beginning of period	1,382	5,822
Cash and cash equivalents, end of period	$2,548	$1,526