Comcast (CMCSA) 10-Q 4 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	cmcsa
Entity Registrant Name	COMCAST CORP
Entity Central Index Key	1166691
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
NBCUniversal Media, LLC [Member]
Entity Registrant Name	NBCUniversal Media, LLC
Entity Central Index Key	902739
Entity Filer Category	Non-accelerated Filer
Class A Common Stock [Member]
Entity Common Stock, Shares Outstanding	2,122,916,309
Class A Special Common Stock [Member]
Entity Common Stock, Shares Outstanding	381,182,478
Class B Common Stock [Member]
Entity Common Stock, Shares Outstanding	9,444,375

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheet (USD $)	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Cash and cash equivalents	$3,937,000,000	$3,910,000,000
Investments [Current]	158,000,000	602,000,000
Receivables, net	6,144,000,000	6,321,000,000
Programming rights	945,000,000	839,000,000
Other current assets	1,737,000,000	1,859,000,000
Total current assets	12,921,000,000	13,531,000,000
Film and television costs	5,637,000,000	5,727,000,000
Investments	3,235,000,000	3,135,000,000
Property and equipment, net	31,127,000,000	30,953,000,000
Franchise rights	59,364,000,000	59,364,000,000
Goodwill	27,302,000,000	27,316,000,000
Other intangible assets, net	16,852,000,000	16,980,000,000
Other noncurrent assets, net	2,319,000,000	2,333,000,000
Total assets	158,757,000,000	159,339,000,000
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	6,157,000,000	5,638,000,000
Accrued participations and residuals	1,387,000,000	1,347,000,000
Deferred revenue	970,000,000	915,000,000
Accrued expenses and other current liabilities	5,808,000,000	5,293,000,000
Current portion of long-term debt	4,180,000,000	4,217,000,000
Total current liabilities	18,502,000,000	17,410,000,000
Long-term debt, less current portion	42,953,000,000	44,017,000,000
Deferred income taxes	32,855,000,000	32,959,000,000
Other noncurrent liabilities	10,837,000,000	10,819,000,000
Commitments and contingencies
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,099,000,000	1,066,000,000
Equity:
Preferred stock - authorized, 20,000,000 shares; issued, zero	0	0
Common stock	30,000,000	30,000,000
Additional paid-in capital	38,660,000,000	38,805,000,000
Retained earnings	21,186,000,000	21,539,000,000
Treasury stock, 365,460,750 Class A common shares and 70,934,764 Class A Special common shares	-7,517,000,000	-7,517,000,000
Accumulated other comprehensive income (loss)	-188,000,000	-146,000,000
Total Comcast Corporation shareholders' equity	52,171,000,000	52,711,000,000
Noncontrolling interests	340,000,000	357,000,000
Total equity	52,511,000,000	53,068,000,000
Total liabilities and equity	158,757,000,000	159,339,000,000
NBCUniversal Media, LLC [Member]
Current Assets:
Cash and cash equivalents	1,036,000,000	1,248,000,000
Receivables, net	4,891,000,000	4,842,000,000
Note receivable from Comcast	135,000,000	0
Programming rights	925,000,000	825,000,000
Other current assets	805,000,000	823,000,000
Total current assets	7,792,000,000	7,738,000,000
Film and television costs	5,628,000,000	5,714,000,000
Investments	953,000,000	882,000,000
Property and equipment, net	8,209,000,000	8,138,000,000
Goodwill	14,897,000,000	14,908,000,000
Intangible assets, net	14,006,000,000	14,187,000,000
Other noncurrent assets, net	1,061,000,000	1,050,000,000
Total assets	52,546,000,000	52,617,000,000
Current Liabilities:
Accounts payable and accrued expenses related to trade creditors	1,382,000,000	1,388,000,000
Accrued participations and residuals	1,387,000,000	1,347,000,000
Program obligations	835,000,000	687,000,000
Deferred revenue	880,000,000	821,000,000
Accrued expenses and other current liabilities	1,427,000,000	1,422,000,000
Note payable to Comcast	0	865,000,000
Current portion of long-term debt	1,020,000,000	1,023,000,000
Total current liabilities	6,931,000,000	7,553,000,000
Long-term debt, less current portion	9,225,000,000	9,226,000,000
Accrued participations, residuals and program obligations	1,125,000,000	1,149,000,000
Other noncurrent liabilities	3,692,000,000	3,722,000,000
Commitments and contingencies
Redeemable noncontrolling interests	336,000,000	330,000,000
Equity:
Member's capital	31,185,000,000	30,529,000,000
Accumulated other comprehensive income (loss)	-210,000,000	-159,000,000
Total NBCUniversal member's equity	30,975,000,000	30,370,000,000
Noncontrolling interests	262,000,000	267,000,000
Total equity	31,237,000,000	30,637,000,000
Total liabilities and equity	52,546,000,000	52,617,000,000
Class A Common Stock [Member]
Equity:
Common stock	25,000,000	25,000,000
Class B Common Stock [Member]
Equity:
Common stock	0	0
Class A Special Common Stock [Member]
Equity:
Common stock	$5,000,000	$5,000,000

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, except Share data, unless otherwise specified
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Accumulated depreciation	$46,037	$45,410
Accumulated amortization	10,507	10,170
NBCUniversal Media, LLC [Member]
Accumulated depreciation	2,309	2,167
Accumulated amortization	$5,027	$4,829
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	2,488,377,059	2,496,598,612
Common stock, outstanding	2,122,916,309	2,131,137,862
Treasury stock common shares	365,460,750	365,460,750
Class A Special Common Stock [Member]
Common stock, par value	$0.01	$0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	452,117,242	471,419,601
Common stock, outstanding	381,182,478	400,484,837
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
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$17,853,000,000	$17,408,000,000
Costs and Expenses:
Programming and production	5,463,000,000	5,908,000,000
Other operating and administrative	5,079,000,000	4,749,000,000
Advertising, marketing and promotion	1,355,000,000	1,213,000,000
Depreciation	1,634,000,000	1,569,000,000
Amortization	432,000,000	401,000,000
Total costs and expenses	13,963,000,000	13,840,000,000
Operating income	3,890,000,000	3,568,000,000
Other Income (Expense):
Interest expense	-656,000,000	-642,000,000
Investment income (loss), net	33,000,000	113,000,000
Equity in net income (losses) of investees, net	33,000,000	32,000,000
Other income (expense), net	102,000,000	-15,000,000
Nonoperating income (expense)	-488,000,000	-512,000,000
Income before income taxes	3,402,000,000	3,056,000,000
Income tax expense	-1,261,000,000	-1,118,000,000
Net income	2,141,000,000	1,938,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-82,000,000	-67,000,000
Net income attributable to Parent	2,059,000,000	1,871,000,000
Basic earnings per common share attributable to Comcast Corporation shareholders	$0.82	$0.72
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.81	$0.71
Dividends declared per common share	$0.25	$0.23
NBCUniversal Media, LLC [Member]
Revenue	6,604,000,000	6,876,000,000
Costs and Expenses:
Programming and production	3,171,000,000	3,742,000,000
Other operating and administrative	1,334,000,000	1,274,000,000
Advertising, marketing and promotion	605,000,000	549,000,000
Depreciation	160,000,000	162,000,000
Amortization	204,000,000	203,000,000
Total costs and expenses	5,474,000,000	5,930,000,000
Operating income	1,130,000,000	946,000,000
Other Income (Expense):
Interest expense	-124,000,000	-129,000,000
Investment income (loss), net	-2,000,000	6,000,000
Equity in net income (losses) of investees, net	20,000,000	18,000,000
Other income (expense), net	-58,000,000	-36,000,000
Nonoperating income (expense)	-164,000,000	-141,000,000
Income before income taxes	966,000,000	805,000,000
Income tax expense	-48,000,000	-64,000,000
Net income	918,000,000	741,000,000
Net income attributable to Parent	$852,000,000	$682,000,000

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Income (NBCUniversal) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$17,853,000,000	$17,408,000,000
Costs and Expenses:
Programming and production	5,463,000,000	5,908,000,000
Other operating and administrative	5,079,000,000	4,749,000,000
Advertising, marketing and promotion	1,355,000,000	1,213,000,000
Depreciation	1,634,000,000	1,569,000,000
Amortization	432,000,000	401,000,000
Total costs and expenses	13,963,000,000	13,840,000,000
Operating income	3,890,000,000	3,568,000,000
Other Income (Expense):
Interest expense	-656,000,000	-642,000,000
Investment income (loss), net	33,000,000	113,000,000
Equity in net income (losses) of investees, net	33,000,000	32,000,000
Other income (expense), net	102,000,000	-15,000,000
Nonoperating income (expense)	-488,000,000	-512,000,000
Income before income taxes	3,402,000,000	3,056,000,000
Income tax expense	-1,261,000,000	-1,118,000,000
Net income	2,141,000,000	1,938,000,000
Net income attributable to Parent	2,059,000,000	1,871,000,000
N B C Universal Media L L C [Member]
Revenue	6,604,000,000	6,876,000,000
Costs and Expenses:
Programming and production	3,171,000,000	3,742,000,000
Other operating and administrative	1,334,000,000	1,274,000,000
Advertising, marketing and promotion	605,000,000	549,000,000
Depreciation	160,000,000	162,000,000
Amortization	204,000,000	203,000,000
Total costs and expenses	5,474,000,000	5,930,000,000
Operating income	1,130,000,000	946,000,000
Other Income (Expense):
Interest expense	-124,000,000	-129,000,000
Investment income (loss), net	-2,000,000	6,000,000
Equity in net income (losses) of investees, net	20,000,000	18,000,000
Other income (expense), net	-58,000,000	-36,000,000
Nonoperating income (expense)	-164,000,000	-141,000,000
Income before income taxes	966,000,000	805,000,000
Income tax expense	-48,000,000	-64,000,000
Net income	918,000,000	741,000,000
Net (income) loss attributable to noncontrolling interests	-66,000,000	-59,000,000
Net income attributable to Parent	$852,000,000	$682,000,000

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$2,141	$1,938
Unrealized gains (losses) on marketable securities, net of deferred taxes	0	30
Deferred gains (losses) on cash flow hedges, net of deferred taxes	-39	-2
Amounts reclassified to net income:
Realized (gains) losses on marketable securities, net of deferred taxes	0	-50
Realized (gains) losses on cash flow hedges, net of deferred taxes	37	-3
Currency translation adjustments, net of deferred taxes	-40	2
Comprehensive income	2,099	1,915
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-82	-67
Comprehensive income attributable to Parent	2,017	1,848
NBCUniversal Media, LLC [Member]
Net income	918	741
Deferred gains (losses) on cash flow hedges, net of deferred taxes	12	0
Amounts reclassified to net income:
Currency translation adjustments, net of deferred taxes	-63	3
Comprehensive income	867	744
Net (income) loss attributable to noncontrolling interests	-66	-59
Comprehensive income attributable to Parent	$801	$685

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Unrealized gains (losses) on marketable securities, deferred taxes	$0	($17)
Deferred gains (losses) on cash flow hedges, deferred taxes	23	1
Realized (gains) losses on marketable securities, deferred taxes	0	30
Realized (gains) losses on cash flow hedges, deferred taxes	-22	2
Currency translation adjustments, deferred taxes	$23	($1)

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Cash Flows (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net cash provided by operating activities	$5,245,000,000	$4,486,000,000
Investing Activities
Capital expenditures	-1,726,000,000	-1,448,000,000
Cash paid for intangible assets	-273,000,000	-217,000,000
Acquisitions and construction of real estate properties	-24,000,000	0
Proceeds from sales of businesses and investments	180,000,000	300,000,000
Purchases of investments	-32,000,000	-37,000,000
Other	181,000,000	-103,000,000
Net cash provided by (used in) investing activities	-1,694,000,000	-1,505,000,000
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	-150,000,000	-364,000,000
Proceeds from borrowings	0	2,187,000,000
Repurchases and repayments of debt	-909,000,000	-2,260,000,000
Repurchases and retirements of common stock	-2,000,000,000	-750,000,000
Dividends paid	-572,000,000	-508,000,000
Issuances of common stock	28,000,000	20,000,000
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-62,000,000	-66,000,000
Other	141,000,000	96,000,000
Net cash provided by (used in) financing activities	-3,524,000,000	-1,645,000,000
Increase (decrease) in cash and cash equivalents	27,000,000	1,336,000,000
Cash and cash equivalents, beginning of period	3,910,000,000	1,718,000,000
Cash and cash equivalents, end of period	3,937,000,000	3,054,000,000
NBCUniversal Media, LLC [Member]
Operating Activities
Net cash provided by operating activities	1,202,000,000	756,000,000
Investing Activities
Capital expenditures	-268,000,000	-291,000,000
Cash paid for intangible assets	-37,000,000	-32,000,000
Note receivable from Comcast	-135,000,000	0
Other	169,000,000	-160,000,000
Net cash provided by (used in) investing activities	-271,000,000	-483,000,000
Financing Activities
Proceeds from (repayments of) borrowings from Comcast, net	-896,000,000	139,000,000
Repurchases and repayments of debt	-1,000,000	-1,000,000
Distributions to noncontrolling interests	-51,000,000	-54,000,000
Distributions to member	-195,000,000	-195,000,000
Other	0	-4,000,000
Net cash provided by (used in) financing activities	-1,143,000,000	-115,000,000
Increase (decrease) in cash and cash equivalents	-212,000,000	158,000,000
Cash and cash equivalents, beginning of period	1,248,000,000	967,000,000
Cash and cash equivalents, end of period	$1,036,000,000	$1,125,000,000

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]	Class A Special Common Stock [Member]	Class B Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	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, 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	29,818	1,053	25	5	0	38,985	19,737	-7,517	33	-13	364	289	317	29,542
Beginning balance at Dec. 31, 2014		30,637									-159		267	330	30,529
Beginning Balance at Dec. 31, 2014	53,068		1,066	25	5	0	38,805	21,539	-7,517	-146		357
Stock compensation plans	43						232	-189
Repurchases and retirements of common stock	-2,000						-407	-1,593
Employee stock purchase plans	30						30
Other comprehensive income (loss)	-42	-51								-42	-51
Dividends declared	-630	-195						-630							-195
Contributions from (distributions to) noncontrolling interests, net	-34	-41										-34	-41	-10
Other	-39	-15	7									-39	-14		-1
Net income (loss)	2,115	902	26					2,059				56	50	16	852
Ending Balance at Mar. 31, 2015	52,511		1,099	25	5	0	38,660	21,186	-7,517	-188		340
Ending balance at Mar. 31, 2015		$31,237									($210)		$262	$336	$31,185

Condensed_Consolidated_Financi

Condensed Consolidated Financial Statements	3 Months Ended
	Mar. 31, 2015
Condensed Consolidated Financial Statements	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.
	The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2014 Annual Report on Form 10-K.
	Reclassifications
	Reclassifications have been made to our condensed consolidated financial statements for the prior year period to conform to classifications used in 2015.
NBCUniversal Media, LLC [Member]
Condensed Consolidated Financial Statements	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	Unless indicated otherwise, throughout these notes to the condensed consolidated financial statements, we refer to NBCUniversal Media, LLC and its consolidated subsidiaries as “we,” “us” and “our.” We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.
	The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2014 Annual Report on Form 10-K.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2015
Recent Accounting Pronouncements	Note 2: Recent Accounting Pronouncements
	Revenue Recognition
	In May 2014, the Financial Accounting Standards Board (“FASB”) and the International Accounting Standards Board updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue, and by reducing the number of standards to which entities have to refer. In April 2015, the FASB voted to propose deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also proposed permitting early adoption of the updated accounting guidance, but not before the original effective date of December 15, 2016. The updated accounting guidance provides companies with alternative methods of adoption. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements and our method of adoption.
	Debt Issuance Costs
	In April 2015, the FASB updated the accounting guidance related to the balance sheet presentation of debt issuance costs. The updated accounting guidance requires that debt issuance costs be presented as a direct deduction from the associated debt liability. The updated accounting guidance will be effective for us on January 1, 2016, and early adoption is permitted. The updated accounting guidance will be applied retrospectively to all prior periods presented. We do not currently expect that the updated accounting guidance will have a material impact on our consolidated balance sheet.
NBCUniversal Media, LLC [Member]
Recent Accounting Pronouncements	Note 2: Recent Accounting Pronouncements
	Revenue Recognition
	In May 2014, the Financial Accounting Standards Board (“FASB”) and the International Accounting Standards Board updated the accounting guidance related to revenue recognition. The updated accounting guidance provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue, and by reducing the number of standards to which entities have to refer. In April 2015, the FASB voted to propose deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also proposed permitting early adoption of the updated accounting guidance, but not before the original effective date of December 15, 2016. The updated accounting guidance provides companies with alternative methods of adoption. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements and our method of adoption.
	Debt Issuance Costs
	In April 2015, the FASB updated the accounting guidance related to the balance sheet presentation of debt issuance costs. The updated accounting guidance requires that debt issuance costs be presented as a direct deduction from the associated debt liability. The updated accounting guidance will be effective for us on January 1, 2016, and early adoption is permitted. The updated accounting guidance will be applied retrospectively to all prior periods presented. We do not currently expect that the updated accounting guidance will have a material impact on our consolidated balance sheet.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share
Earnings Per Share	Note 3: Earnings Per Share
	Computation of Diluted EPS
			Three Months Ended March 31
				2015					2014
	(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	$	2,059	2,520	$	0.82	$	1,871	2,603	$	0.72
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			36					42
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	2,059	2,556	$	0.81	$	1,871	2,645	$	0.71
	Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Our potentially dilutive securities include potential common shares related to our stock options and our restricted share units (“RSUs”).
	The amount of potential common shares related to our share-based compensation plans that were excluded from diluted EPS because their effect would have been antidilutive was not material for the three months ended March 31, 2015 and 2014.

Significant_Transactions

Significant Transactions	3 Months Ended
	Mar. 31, 2015
Significant Transactions	Note 4: Significant Transactions
	Time Warner Cable Merger and Related Divestiture Transactions
	On February 12, 2014, we entered into an agreement and plan of merger (the “merger agreement”) with Time Warner Cable Inc. (“Time Warner Cable”), which contemplated that Time Warner Cable would become our wholly owned subsidiary. On April 24, 2015, we and Time Warner Cable entered into a termination agreement, which terminated the merger agreement.
	On April 25, 2014, we entered into an agreement with Charter Communications, Inc. (“Charter”), which contemplated three transactions: (1) a spin-off of certain of our existing cable systems into a newly formed public entity, (2) an exchange of certain former Time Warner Cable cable systems for Charter cable systems, and (3) a sale to Charter of certain former Time Warner Cable cable systems for cash (collectively, the “divestiture transactions”). In accordance with the terms of this agreement, the divestiture transactions became terminable upon termination of the merger agreement. On April 24, 2015, we delivered a notice of termination of the agreement to Charter.
	In connection with the Time Warner Cable merger and the divestiture transactions, we incurred incremental expenses of $99 million and $17 million for the three months ended March 31, 2015 and 2014, respectively. The transaction-related expenses included legal, accounting and valuation services and advisory fees, all of which are reflected in other operating and administrative expenses.

Related_Party_Transactions

Related Party Transactions (NBCUniversal Media, LLC [Member])	3 Months Ended
	Mar. 31, 2015
NBCUniversal Media, LLC [Member]
Related Party Transactions	Note 3: Related Party Transactions
	In the ordinary course of our business, we enter into transactions with Comcast.
	We generate revenue from Comcast primarily from the distribution of our cable network programming 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 or to us by Comcast under the revolving credit agreement, including accrued interest, are presented under the captions “note payable to Comcast” and “note receivable from Comcast,” respectively, in our condensed consolidated balance sheet. The revolving credit agreement bears 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, 2015, the borrowing margin for our 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, 2015, the carrying value of the liability associated with this contractual obligation was $383 million.
	The following tables present transactions with Comcast and its consolidated subsidiaries that are included in our condensed consolidated financial statements.
	Condensed Consolidated Balance Sheet
				March 31,			December 31,
	(in millions)			2015				2014
	Transactions with Comcast and Consolidated Subsidiaries
		Receivables, net		$	241		$	229
		Note receivable from Comcast		$	135		$	-
		Accounts payable and accrued expenses related to trade creditors		$	38		$	47
		Accrued expenses and other current liabilities		$	9		$	8
		Note payable to Comcast		$	-		$	865
		Other noncurrent liabilities		$	402		$	383
	Condensed Consolidated Statement of Income
				Three Months Ended
			31-Mar
	(in millions)			2015			2014
	Transactions with Comcast and Consolidated Subsidiaries
		Revenue	$	342		$	361
		Operating costs and expenses	$	-50		$	-37
		Other income (expense)	$	-9		$	-9
	Distributions to NBCUniversal Holdings
	In addition to the transactions presented in the table above, we make distributions to NBCUniversal Holdings on a periodic basis to enable its owners to meet their obligations to pay taxes on taxable income generated by our businesses. We also make quarterly distributions to NBCUniversal Holdings to enable it to make its required quarterly payments to NBCUniversal Enterprise, Inc. (“NBCUniversal Enterprise”) 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, 2015
Film And Television Costs Disclosure [Text Block]	Note 5: Film and Television Costs
				March 31,		December 31,
	(in millions)			2015		2014
	Film Costs:
		Released, less amortization	$	1,244	$	1,371
		Completed, not released		444		71
		In production and in development		952		1,189
				2,640		2,631
	Television Costs:
		Released, less amortization		1,361		1,273
		In production and in development		407		505
				1,768		1,778
	Programming rights, less amortization			2,174		2,157
				6,582		6,566
	Less: Current portion of programming rights			945		839
	Film and television costs		$	5,637	$	5,727
NBCUniversal Media, LLC [Member]
Film And Television Costs Disclosure [Text Block]	Note 4: Film and Television Costs
				March 31,		December 31,
	(in millions)			2015		2014
	Film Costs:
		Released, less amortization	$	1,244	$	1,371
		Completed, not released		444		71
		In production and in development		952		1,189
				2,640		2,631
	Television Costs:
		Released, less amortization		1,361		1,273
		In production and in development		407		505
				1,768		1,778
	Programming rights, less amortization			2,145		2,130
				6,553		6,539
	Less: Current portion of programming rights			925		825
	Film and television costs		$	5,628	$	5,714

Investments

Investments	3 Months Ended
	Mar. 31, 2015
Investments	Note 6: Investments
				March 31,		December 31,
	(in millions)			2015		2014
	Fair Value Method		$	182	$	662
	Equity Method:
		The Weather Channel		336		335
		Hulu		279		167
		Other		534		517
				1,149		1,019
	Cost Method:
		AirTouch		1,572		1,568
		Other		490		488
				2,062		2,056
	Total investments			3,393		3,737
	Less: Current investments			158		602
	Noncurrent investments		$	3,235	$	3,135
	Investment Income (Loss), Net
			Three Months Ended
			31-Mar
	(in millions)		2015		2014
	Gains on sales and exchanges of investments, net		$	-	$	83
	Investment impairment losses			-15		-5
	Unrealized gains (losses) on securities underlying prepaid forward sale agreements			42		-113
	Mark to market adjustments on derivative component of prepaid forward sale
		agreements and indexed debt instruments		-38		117
	Interest and dividend income			28		28
	Other, net			16		3
	Investment income (loss), net		$	33	$	113
	Fair Value Method
	During the three months ended March 31, 2015, we settled $517 million of our obligations under prepaid forward sale agreements by delivering equity securities. As of March 31, 2015, we have no remaining liabilities related to obligations under prepaid forward sale agreements.
	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, 2015, the estimated fair values of the AirTouch preferred stock and the associated liability related to the redeemable subsidiary preferred shares issued by one of our consolidated subsidiaries were each $1.7 billion. The estimated fair values are based on Level 2 inputs that use pricing models whose inputs are derived primarily from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument.
NBCUniversal Media, LLC [Member]
Investments	Note 5: Investments
				March 31,		December 31,
	(in millions)			2015		2014
	Fair Value Method		$	10	$	10
	Equity Method:
		The Weather Channel		336		335
		Hulu		279		167
		Other		356		338
				971		840
	Cost Method			24		32
	Total investments			1,005		882
	Less: Current investments			52		-
	Noncurrent investments		$	953	$	882

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Long-Term Debt	Note 7: Long-Term Debt
	As of March 31, 2015, our debt had a carrying value of $47.1 billion and an estimated fair value of $54.9 billion. The estimated fair value of our publicly traded debt is primarily based on Level 1 inputs that use quoted market values for the debt. The estimated fair value of debt for which there are no quoted market prices is based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities.
	Debt Repayments
	In January 2015, we repaid at maturity $900 million aggregate principal amount of 6.50% senior notes due 2015. In April 2015, we repaid at maturity $1 billion aggregate principal amount of 3.65% senior notes due 2015.
	Revolving Credit Facilities
	As of March 31, 2015, amounts available under our consolidated revolving credit facilities, net of amounts outstanding under our commercial paper programs and outstanding letters of credit, totaled $6.6 billion, which included $650 million available under NBCUniversal Enterprise Inc.’s (“NBCUniversal Enterprise”) revolving credit facility.
	Commercial Paper Programs
	As of March 31, 2015, NBCUniversal Enterprise had $700 million face amount of commercial paper outstanding.
NBCUniversal Media, LLC [Member]
Long-Term Debt	Note 6: Long-Term Debt
	As of March 31, 2015, our debt had a carrying value of $10.2 billion and an estimated fair value of $11.6 billion. The estimated fair value of our publicly traded debt is primarily based on Level 1 inputs that use quoted market values for the debt. The estimated fair value of debt for which there are no quoted market prices is based on Level 2 inputs that use interest rates available to us for debt with similar terms and remaining maturities.
	Debt Repayments
	In April 2015, we repaid at maturity $1 billion aggregate principal amount of 3.65% senior notes due 2015.
	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, 2015, we guaranteed $31.7 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, 2015.
	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 revolving 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, 2015
Fair Value Measurements	Note 8: 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
			March 31,								December 31,
			2015								2014
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities		$	42	$	-	$	-	$	42	$	523
	Available-for-sale securities			1		121		10		132		132
	Interest rate swap agreements			-		91		-		91		84
	Other			-		48		8		56		71
	Total		$	43	$	260	$	18	$	321	$	810
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments	$	-	$	3	$	-	$	3	$	361
	Contractual obligations			-		-		904		904		883
	Contingent consideration			-		-		632		632		644
	Other			-		50		-		50		8
	Total		$	-	$	53	$	1,536	$	1,589	$	1,896
	Contractual Obligations and Contingent Consideration
	The estimated fair values of the contractual obligations 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 include our estimates of the future revenue we expect to generate from certain NBCUniversal businesses, which are related to our contractual obligations, and future net tax benefits that will affect payments to General Electric Company (“GE”), which are related to our 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, the terms of the respective contracts and the uncertainty in the timing of our payments to GE. The fair value adjustments to contractual obligations 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 Obligations and Contingent Consideration
	(in millions)		Contractual Obligations		Contingent Consideration
	Balance, December 31, 2014	$	883	$	644
	Fair value adjustments		40		7
	Payments		-19		-19
	Balance, March 31, 2015	$	904	$	632
	Fair Value of Redeemable Subsidiary Preferred Stock
	As of March 31, 2015, the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $764 million. The estimated fair value is based on Level 2 inputs that use pricing models whose inputs are derived primarily from or corroborated by observable market data through correlation or other means for substantially the full term of the financial instrument.
NBCUniversal Media, LLC [Member]
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). 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 liabilities associated with our contractual obligations. The fair values of the contractual obligations in the table below are 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 these contractual obligations as Level 3 financial instruments.
	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 measurements of fair value as of March 31, 2015 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 contracts. The fair value adjustments to the contractual obligations are 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 Obligations
	(in millions)		Contractual Obligations
	Balance, December 31, 2014	$	883
	Fair value adjustments		40
	Payments		-19
	Balance, March 31, 2015	$	904

ShareBased_Compensation

Share-Based Compensation	3 Months Ended
	Mar. 31, 2015
Share-Based Compensation	Note 9: 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 2015, we granted 17.6 million stock options and 5.1 million RSUs related to our annual management awards. The weighted-average fair values associated with these grants were $11.79 per stock option and $59.50 per RSU.
	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2015		2014
	Stock options	$	35	$	36
	Restricted share units		58		48
	Employee stock purchase plans		8		6
	Total	$	101	$	90
	As of March 31, 2015, we had unrecognized pretax compensation expense of $461 million and $725 million related to nonvested stock options and nonvested RSUs, respectively.
NBCUniversal Media, LLC [Member]
Share-Based Compensation	Note 8: 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 its employee stock purchase plans, employees are able to purchase shares of Comcast 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)	2015		2014
	Stock options	$	2	$	3
	Restricted share units		17		13
	Employee stock purchase plans		2		2
	Total	$	21	$	18

Supplemental_Financial_Informa

Supplemental Financial Information	3 Months Ended
	Mar. 31, 2015
Supplemental Financial Information	Note 10: Supplemental Financial Information
	Receivables
		March 31,		December 31,
	(in millions)	2015		2014
	Receivables, gross	$	6,634	$	6,885
	Less: Allowance for returns and customer incentives		297		359
	Less: Allowance for doubtful accounts		193		205
	Receivables, net	$	6,144	$	6,321
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2015		2014
	Unrealized gains (losses) on marketable securities		$	1	$	47
	Deferred gains (losses) on cash flow hedges			-6		-50
	Unrecognized gains (losses) on employee benefit obligations			-68		71
	Cumulative translation adjustments			-115		-35
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-188	$	33
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2015		2014
	Net income				$	2,141	$	1,938
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				2,066		1,970
		Share-based compensation				135		119
		Noncash interest expense (income), net				51		42
		Equity in net (income) losses of investees, net				-33		-32
		Cash received from investees				22		18
		Net (gain) loss on investment activity and other				-121		-59
		Deferred income taxes				-119		-226
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				119		195
		Film and television costs, net				-38		154
		Accounts payable and accrued expenses related to trade creditors				372		82
		Other operating assets and liabilities				650		285
	Net cash provided by operating activities				$	5,245	$	4,486
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2015		2014
	Interest	$	691	$	623
	Income taxes	$	118	$	186
	Noncash Investing and Financing Activities
	During the three months ended March 31, 2015:
	• we acquired $978 million of property and equipment and intangible assets that were accrued but unpaid
	• we recorded a liability of $630 million for a quarterly cash dividend of $0.25 per common share paid in April 2015
	• we used $517 million of equity securities to settle our obligations under prepaid forward sale agreements
	• we recorded a liability of $123 million for a capital contribution for an investment that was accrued but unpaid
NBCUniversal Media, LLC [Member]
Supplemental Financial Information	Note 9: Supplemental Financial Information
	Receivables
		March 31,		December 31,
	(in millions)	2015		2014
	Receivables, gross	$	5,248	$	5,258
	Less: Allowance for returns and customer incentives		294		356
	Less: Allowance for doubtful accounts		63		60
	Receivables, net	$	4,891	$	4,842
	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2015		2014
	Deferred gains (losses) on cash flow hedges		$	32	$	-6
	Unrecognized gains (losses) on employee benefit obligations			-61		46
	Cumulative translation adjustments			-181		-53
	Accumulated other comprehensive income (loss)		$	-210	$	-13
	Net Cash Provided by Operating Activities
					Three Months Ended
					31-Mar
	(in millions)				2015		2014
	Net income				$	918	$	741
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				364		365
		Equity in net (income) losses of investees, net				-20		-18
		Cash received from investees				12		12
		Net (gain) loss on investment activity and other				46		21
		Deferred income taxes				3		16
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				-106		55
		Film and television costs, net				-36		148
		Accounts payable and accrued expenses related to trade creditors				16		-117
		Other operating assets and liabilities				5		-467
	Net cash provided by operating activities				$	1,202	$	756
	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2015		2014
	Interest	$	33	$	36
	Income taxes	$	40	$	53
	Noncash Investing and Financing Activities
	During the three months ended March 31, 2015:
	• we acquired $153 million of property and equipment and intangible assets that were accrued but unpaid
	• we recorded a liability of $123 million for a capital contribution for an investment that was accrued but unpaid

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies	Note 11: Commitments and Contingencies
	Contingencies
	We are a defendant in several unrelated lawsuits claiming infringement of various patents relating to various aspects of our businesses. In certain of these cases other industry participants are also defendants, and also in certain of these cases we expect that any potential liability would be in part or in whole the responsibility of our equipment and technology vendors under applicable contractual indemnification provisions.
	We are also subject to other legal proceedings and claims that arise in the ordinary course of our business. While the amount of ultimate liability with respect to such actions is not expected to materially affect our results of operations, cash flows or financial position, any litigation resulting from any such legal proceedings or claims could be time-consuming and injure our reputation.

Financial_Data_by_Business_Seg

Financial Data by Business Segment	3 Months Ended
	Mar. 31, 2015
Financial Data by Business Segment	Note 12: 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; we also provide similar and other services to small and medium-sized businesses and sell advertising.
	• Cable Networks: Consists primarily of our national cable networks, our regional sports and news networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, the NBC Universo national cable network, and our broadcast television 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, Florida and Hollywood, California.
	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, 2015
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	11,430	$	4,674	$	1,675	$	2,999	$	1,445
	NBCUniversal
		Cable Networks		2,359		898		184		714		6
		Broadcast Television		2,248		182		29		153		11
		Filmed Entertainment		1,446		293		5		288		1
		Theme Parks		651		263		66		197		162
		Headquarters and Other(b)		4		-140		80		-220		88
		Eliminations(c)		-104		-2		-		-2		-
	NBCUniversal			6,604		1,494		364		1,130		268
	Corporate and Other			204		-225		27		-252		13
	Eliminations(c)			-385		13		-		13		-
	Comcast Consolidated		$	17,853	$	5,956	$	2,066	$	3,890	$	1,726
			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 Communications(a)		$	10,757	$	4,400	$	1,584	$	2,816	$	1,145
	NBCUniversal
		Cable Networks		2,505		895		189		706		11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment		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		-
	NBCUniversal			6,876		1,311		365		946		291
	Corporate and Other			174		-153		21		-174		12
	Eliminations(c)			-399		-20		-		-20		-
	Comcast Consolidated		$	17,408	$	5,538	$	1,970	$	3,568	$	1,448
	For the three months ended March 31, 2015 and 2014, Cable Communications segment revenue was derived from the following sources:
			Three Months Ended
			31-Mar
			2015		2014
	Residential:
		Video	46.6	%	48.1	%
		High-speed Internet	26.6	%	25.6	%
		Voice	7.9	%	8.5	%
	Business services		9.7	%	8.5	%
	Advertising		4.4	%	4.7	%
	Other		4.8	%	4.6	%
	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 both the three months ended March 31, 2015 and 2014, 2.8% of Cable Communications segment revenue was derived from franchise and other regulatory fees.
	NBCUniversal Headquarters and Other activities include 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 10: Financial Data by Business Segment
	We present our operations in four reportable business segments:
	• Cable Networks: Consists primarily of our national cable networks, our regional sports and news networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, the NBC Universo national cable network, and our broadcast television 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, Florida and Hollywood. California.
	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, 2015
	(in millions)			Revenue(c)		Operating Income (Loss) Before Depreciation and Amortization(d)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks		$	2,359	$	898	$	184	$	714	$	6
	Broadcast Television			2,248		182		29		153		11
	Filmed Entertainment			1,446		293		5		288		1
	Theme Parks			651		263		66		197		162
	Headquarters and Other(a)			4		-140		80		-220		88
	Eliminations(b)			-104		-2		-		-2		-
	Total		$	6,604	$	1,494	$	364	$	1,130	$	268
			Three Months Ended March 31, 2014
	(in millions)			Revenue(c)		Operating Income (Loss) Before Depreciation and Amortization(d)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks		$	2,505	$	895	$	189	$	706	$	11
	Broadcast Television			2,621		122		27		95		11
	Filmed Entertainment			1,351		288		5		283		1
	Theme Parks			487		170		69		101		144
	Headquarters and Other(a)			2		-163		75		-238		124
	Eliminations(b)			-90		-1		-		-1		-
	Total		$	6,876	$	1,311	$	365	$	946	$	291
	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, 2015
Condensed Consolidating Financial Information [Abstract]
Condensed Consolidating Financial Information	Note 13: Condensed Consolidating Financial Information
	Comcast (“Comcast Parent”), 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”) and NBCUniversal (“NBCUniversal Media Parent”) have fully and unconditionally guaranteed each other’s debt securities. In addition, the Comcast and Comcast Cable Communications, LLC $6.25 billion revolving credit facility due June 2017 and the Comcast commercial paper program are also fully and unconditionally guaranteed by NBCUniversal Media Parent. The Comcast commercial paper program is supported by the Comcast and Comcast Cable Communications, LLC revolving credit facility. 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 senior notes, as well as its $1.35 billion revolving 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-15
	(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	$	-	$	-	$	-	$	-	$	339	$	3,598	$	-	$	3,937
		Investments		-		-		-		-		-		158		-		158
		Receivables, net		-		-		-		-		-		6,144		-		6,144
		Programming rights		-		-		-		-		-		945		-		945
		Other current assets		279		-		-		-		64		1,394		-		1,737
	Total current assets			279		-		-		-		403		12,239		-		12,921
	Film and television costs			-		-		-		-		-		5,637		-		5,637
	Investments			31		-		-		-		372		2,832		-		3,235
	Investments in and amounts due from subsidiaries eliminated upon consolidation			82,713		105,551		112,432		60,289		41,900		101,682		-504,567		-
	Property and equipment, net			200		-		-		-		-		30,927		-		31,127
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,302		-		27,302
	Other intangible assets, net			10		-		-		-		-		16,842		-		16,852
	Other noncurrent assets, net			1,201		148		-		-		97		1,970		-1,097		2,319
	Total assets		$	84,434	$	105,699	$	112,432	$	60,289	$	42,772	$	258,795	$	-505,664	$	158,757
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	7	$	-	$	-	$	-	$	-	$	6,150	$	-	$	6,157
		Accrued participations and residuals		-		-		-		-		-		1,387		-		1,387
		Accrued expenses and other current liabilities		1,534		283		343		21		407		4,190		-		6,778
		Current portion of long-term debt		1,761		-		-		676		1,003		740		-		4,180
	Total current liabilities			3,302		283		343		697		1,410		12,467		-		18,502
	Long-term debt, less current portion			26,566		126		1,828		822		9,217		4,394		-		42,953
	Deferred income taxes			-		682		-		-		67		33,059		-953		32,855
	Other noncurrent liabilities			2,395		-		-		-		1,103		7,483		-144		10,837
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,099		-		1,099
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		52,141		104,608		110,261		58,770		30,975		199,953		-504,567		52,141
	Total Comcast Corporation
		shareholders’ equity		52,171		104,608		110,261		58,770		30,975		199,953		-504,567		52,171
	Noncontrolling interests			-		-		-		-		-		340		-		340
	Total equity			52,171		104,608		110,261		58,770		30,975		200,293		-504,567		52,511
	Total liabilities and equity		$	84,434	$	105,699	$	112,432	$	60,289	$	42,772	$	258,795	$	-505,664	$	158,757
	Condensed Consolidating Balance Sheet
	31-Dec-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	$	-	$	-	$	-	$	-	$	385	$	3,525	$	-	$	3,910
		Investments		-		-		-		-		-		602		-		602
		Receivables, net		-		-		-		-		-		6,321		-		6,321
		Programming rights		-		-		-		-		-		839		-		839
		Other current assets		267		-		-		-		41		1,551		-		1,859
	Total current assets			267		-		-		-		426		12,838		-		13,531
	Film and television costs			-		-		-		-		-		5,727		-		5,727
	Investments			36		-		-		-		378		2,721		-		3,135
	Investments in and amounts due from subsidiaries eliminated upon consolidation			84,142		103,420		110,323		58,677		41,239		98,152		-495,953		-
	Property and equipment, net			199		-		-		-		-		30,754		-		30,953
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,316		-		27,316
	Other intangible assets, net			11		-		-		-		-		16,969		-		16,980
	Other noncurrent assets, net			1,224		148		-		-		92		1,949		-1,080		2,333
	Total assets		$	85,879	$	103,568	$	110,323	$	58,677	$	42,135	$	255,790	$	-497,033	$	159,339
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	19	$	-	$	-	$	1	$	-	$	5,618	$	-	$	5,638
		Accrued participations and residuals		-		-		-		-		-		1,347		-		1,347
		Accrued expenses and other current liabilities		1,547		283		233		47		331		3,767		-		6,208
	Current portion of long-term debt		1,650		-		-		677		1,006		884		-		4,217
Total current liabilities			3,216		283		233		725		1,337		11,616		-		17,410
Long-term debt, less current portion			27,616		126		1,827		822		9,218		4,408		-		44,017
Deferred income taxes			-		701		-		-		67		33,127		-936		32,959
Other noncurrent liabilities			2,336		-		-		-		1,143		7,484		-144		10,819
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,066		-		1,066
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		52,681		102,458		108,263		57,130		30,370		197,732		-495,953		52,681
Total Comcast Corporation shareholders’ equity			52,711		102,458		108,263		57,130		30,370		197,732		-495,953		52,711
Noncontrolling interests			-		-		-		-		-		357		-		357
Total equity			52,711		102,458		108,263		57,130		30,370		198,089		-495,953		53,068
Total liabilities and equity		$	85,879	$	103,568	$	110,323	$	58,677	$	42,135	$	255,790	$	-497,033	$	159,339
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2015
(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	$	-	$	-	$	-	$	-	$	-	$	17,853	$	-	$	17,853
	Management fee revenue		244		-		237		150		-		-		-631		-
			244		-		237		150		-		17,853		-631		17,853
Costs and Expenses:
	Programming and production		-		-		-		-		-		5,463		-		5,463
	Other operating and administrative		226		-		237		150		237		4,860		-631		5,079
	Advertising, marketing and promotion		-		-		-		-		-		1,355		-		1,355
	Depreciation		8		-		-		-		-		1,626		-		1,634
	Amortization		1		-		-		-		-		431		-		432
			235		-		237		150		237		13,735		-631		13,963
Operating income (loss)			9		-		-		-		-237		4,118		-		3,890
Other Income (Expense):
	Interest expense		-410		-3		-44		-29		-120		-50		-		-656
	Investment income (loss), net		1		2		-		-		-6		36		-		33
	Equity in net income
	(losses) of investees, net		2,322		2,226		1,973		1,646		1,231		885		-10,250		33
	Other income (expense), net		-5		-		-		-		-11		118		-		102
			1,908		2,225		1,929		1,617		1,094		989		-10,250		-488
Income (loss) before income taxes			1,917		2,225		1,929		1,617		857		5,107		-10,250		3,402
Income tax (expense) benefit			142		-		15		10		-5		-1,423		-		-1,261
Net income (loss)			2,059		2,225		1,944		1,627		852		3,684		-10,250		2,141
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-82		-		-82
Net income (loss) attributable
	to Comcast Corporation	$	2,059	$	2,225	$	1,944	$	1,627	$	852	$	3,602	$	-10,250	$	2,059
Comprehensive income (loss)
	attributable to Comcast Corporation	$	2,017	$	2,209	$	1,943	$	1,626	$	801	$	3,601	$	-10,180	$	2,017
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		4,629		-594		4,749
	Advertising, marketing and promotion		-		-		-		-		-		1,213		-		1,213
	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 Cash Flows
For the Three Months Ended March 31, 2015
(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		$	-294	$	-1	$	82	$	-48	$	-361	$	5,867	$	-	$	5,245
Investing Activities
	Net transactions with affiliates		3,609		1		-82		48		321		-3,897		-		-
	Capital expenditures		-6		-		-		-		-		-1,720		-		-1,726
	Cash paid for intangible assets		-		-		-		-		-		-273		-		-273
	Acquisitions and construction of real estate properties		-		-		-		-		-		-24		-		-24
	Proceeds from sales of businesses and investments		-		-		-		-		-		180		-		180
	Purchases of investments		-		-		-		-		-		-32		-		-32
	Other		-		-		-		-		-5		186		-		181
Net cash provided by (used in) investing activities			3,603		1		-82		48		316		-5,580		-		-1,694
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-		-		-		-		-		-150		-		-150
	Proceeds from borrowings		-		-		-		-		-		-		-		-
	Repurchases and repayments of debt		-900		-		-		-		-1		-8		-		-909
	Repurchases and retirements of common stock		-2,000		-		-		-		-		-		-		-2,000
	Dividends paid		-572		-		-		-		-		-		-		-572
	Issuances of common stock		28		-		-		-		-		-		-		28
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-62		-		-62
	Other		135		-		-		-		-		6		-		141
Net cash provided by (used in) financing activities			-3,309		-		-		-		-1		-214		-		-3,524
Increase (decrease) in cash and cash equivalents			-		-		-		-		-46		73		-		27
Cash and cash equivalents, beginning of period			-		-		-		-		385		3,525		-		3,910
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	339	$	3,598	$	-	$	3,937
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

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share
Computation of diluted EPS	Computation of Diluted EPS
			Three Months Ended March 31
				2015					2014
	(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	$	2,059	2,520	$	0.82	$	1,871	2,603	$	0.72
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			36					42
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	2,059	2,556	$	0.81	$	1,871	2,645	$	0.71

Related_Party_Transactions_Tab

Related Party Transactions (Tables) (NBCUniversal Media, LLC [Member])	3 Months Ended
	Mar. 31, 2015
NBCUniversal Media, LLC [Member]
Related Party Transactions Condensed Financial Statements	Condensed Consolidated Balance Sheet
				March 31,			December 31,
	(in millions)			2015				2014
	Transactions with Comcast and Consolidated Subsidiaries
		Receivables, net		$	241		$	229
		Note receivable from Comcast		$	135		$	-
		Accounts payable and accrued expenses related to trade creditors		$	38		$	47
		Accrued expenses and other current liabilities		$	9		$	8
		Note payable to Comcast		$	-		$	865
		Other noncurrent liabilities		$	402		$	383
	Condensed Consolidated Statement of Income
				Three Months Ended
			31-Mar
	(in millions)			2015			2014
	Transactions with Comcast and Consolidated Subsidiaries
		Revenue	$	342		$	361
		Operating costs and expenses	$	-50		$	-37
		Other income (expense)	$	-9		$	-9

Film_and_Television_Costs_Tabl

Film and Television Costs (Tables)	3 Months Ended
	Mar. 31, 2015
Film and Television Costs				March 31,		December 31,
	(in millions)			2015		2014
	Film Costs:
		Released, less amortization	$	1,244	$	1,371
		Completed, not released		444		71
		In production and in development		952		1,189
				2,640		2,631
	Television Costs:
		Released, less amortization		1,361		1,273
		In production and in development		407		505
				1,768		1,778
	Programming rights, less amortization			2,174		2,157
				6,582		6,566
	Less: Current portion of programming rights			945		839
	Film and television costs		$	5,637	$	5,727
NBCUniversal Media, LLC [Member]
Film and Television Costs				March 31,		December 31,
	(in millions)			2015		2014
	Film Costs:
		Released, less amortization	$	1,244	$	1,371
		Completed, not released		444		71
		In production and in development		952		1,189
				2,640		2,631
	Television Costs:
		Released, less amortization		1,361		1,273
		In production and in development		407		505
				1,768		1,778
	Programming rights, less amortization			2,145		2,130
				6,553		6,539
	Less: Current portion of programming rights			925		825
	Film and television costs		$	5,628	$	5,714

Investments_Tables

Investments (Tables)	3 Months Ended
	Mar. 31, 2015
Investment Summary				March 31,		December 31,
	(in millions)			2015		2014
	Fair Value Method		$	182	$	662
	Equity Method:
		The Weather Channel		336		335
		Hulu		279		167
		Other		534		517
				1,149		1,019
	Cost Method:
		AirTouch		1,572		1,568
		Other		490		488
				2,062		2,056
	Total investments			3,393		3,737
	Less: Current investments			158		602
	Noncurrent investments		$	3,235	$	3,135
Investment Income (Loss), Net	Investment Income (Loss), Net
			Three Months Ended
			31-Mar
	(in millions)		2015		2014
	Gains on sales and exchanges of investments, net		$	-	$	83
	Investment impairment losses			-15		-5
	Unrealized gains (losses) on securities underlying prepaid forward sale agreements			42		-113
	Mark to market adjustments on derivative component of prepaid forward sale
		agreements and indexed debt instruments		-38		117
	Interest and dividend income			28		28
	Other, net			16		3
	Investment income (loss), net		$	33	$	113
NBCUniversal Media, LLC [Member]
Investment Summary				March 31,		December 31,
	(in millions)			2015		2014
	Fair Value Method		$	10	$	10
	Equity Method:
		The Weather Channel		336		335
		Hulu		279		167
		Other		356		338
				971		840
	Cost Method			24		32
	Total investments			1,005		882
	Less: Current investments			52		-
	Noncurrent investments		$	953	$	882

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Assets and Liabilities Measured on Recurring Basis	Recurring Fair Value Measures
			Fair Value as of
			March 31,								December 31,
			2015								2014
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities		$	42	$	-	$	-	$	42	$	523
	Available-for-sale securities			1		121		10		132		132
	Interest rate swap agreements			-		91		-		91		84
	Other			-		48		8		56		71
	Total		$	43	$	260	$	18	$	321	$	810
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments	$	-	$	3	$	-	$	3	$	361
	Contractual obligations			-		-		904		904		883
	Contingent consideration			-		-		632		632		644
	Other			-		50		-		50		8
	Total		$	-	$	53	$	1,536	$	1,589	$	1,896
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Changes in Contractual Obligations and Contingent Consideration
	(in millions)		Contractual Obligations		Contingent Consideration
	Balance, December 31, 2014	$	883	$	644
	Fair value adjustments		40		7
	Payments		-19		-19
	Balance, March 31, 2015	$	904	$	632
NBCUniversal Media, LLC [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	Changes in Contractual Obligations
	(in millions)		Contractual Obligations
	Balance, December 31, 2014	$	883
	Fair value adjustments		40
	Payments		-19
	Balance, March 31, 2015	$	904

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Recognized Share-Based Compensation Expense	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2015		2014
	Stock options	$	35	$	36
	Restricted share units		58		48
	Employee stock purchase plans		8		6
	Total	$	101	$	90
NBCUniversal Media, LLC [Member]
Recognized Share-Based Compensation Expense	Recognized Share-Based Compensation Expense
		Three Months Ended
		31-Mar
	(in millions)	2015		2014
	Stock options	$	2	$	3
	Restricted share units		17		13
	Employee stock purchase plans		2		2
	Total	$	21	$	18

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables	Receivables
		March 31,		December 31,
	(in millions)	2015		2014
	Receivables, gross	$	6,634	$	6,885
	Less: Allowance for returns and customer incentives		297		359
	Less: Allowance for doubtful accounts		193		205
	Receivables, net	$	6,144	$	6,321
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2015		2014
	Unrealized gains (losses) on marketable securities		$	1	$	47
	Deferred gains (losses) on cash flow hedges			-6		-50
	Unrecognized gains (losses) on employee benefit obligations			-68		71
	Cumulative translation adjustments			-115		-35
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-188	$	33
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)				2015		2014
	Net income				$	2,141	$	1,938
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				2,066		1,970
		Share-based compensation				135		119
		Noncash interest expense (income), net				51		42
		Equity in net (income) losses of investees, net				-33		-32
		Cash received from investees				22		18
		Net (gain) loss on investment activity and other				-121		-59
		Deferred income taxes				-119		-226
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				119		195
		Film and television costs, net				-38		154
		Accounts payable and accrued expenses related to trade creditors				372		82
		Other operating assets and liabilities				650		285
	Net cash provided by operating activities				$	5,245	$	4,486
Cash Payments For Interest and Income Taxes	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2015		2014
	Interest	$	691	$	623
	Income taxes	$	118	$	186
NBCUniversal Media, LLC [Member]
Receivables	Receivables
		March 31,		December 31,
	(in millions)	2015		2014
	Receivables, gross	$	5,248	$	5,258
	Less: Allowance for returns and customer incentives		294		356
	Less: Allowance for doubtful accounts		63		60
	Receivables, net	$	4,891	$	4,842
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss)
			March 31,		March 31,
	(in millions)		2015		2014
	Deferred gains (losses) on cash flow hedges		$	32	$	-6
	Unrecognized gains (losses) on employee benefit obligations			-61		46
	Cumulative translation adjustments			-181		-53
	Accumulated other comprehensive income (loss)		$	-210	$	-13
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)				2015		2014
	Net income				$	918	$	741
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				364		365
		Equity in net (income) losses of investees, net				-20		-18
		Cash received from investees				12		12
		Net (gain) loss on investment activity and other				46		21
		Deferred income taxes				3		16
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				-106		55
		Film and television costs, net				-36		148
		Accounts payable and accrued expenses related to trade creditors				16		-117
		Other operating assets and liabilities				5		-467
	Net cash provided by operating activities				$	1,202	$	756
Cash Payments For Interest and Income Taxes	Cash Payments for Interest and Income Taxes
		Three Months Ended
		31-Mar
	(in millions)		2015		2014
	Interest	$	33	$	36
	Income taxes	$	40	$	53

Financial_Data_by_Business_Seg1

Financial Data by Business Segment (Tables)	3 Months Ended
	Mar. 31, 2015
Financial Data by Business Segment			Three Months Ended March 31, 2015
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	11,430	$	4,674	$	1,675	$	2,999	$	1,445
	NBCUniversal
		Cable Networks		2,359		898		184		714		6
		Broadcast Television		2,248		182		29		153		11
		Filmed Entertainment		1,446		293		5		288		1
		Theme Parks		651		263		66		197		162
		Headquarters and Other(b)		4		-140		80		-220		88
		Eliminations(c)		-104		-2		-		-2		-
	NBCUniversal			6,604		1,494		364		1,130		268
	Corporate and Other			204		-225		27		-252		13
	Eliminations(c)			-385		13		-		13		-
	Comcast Consolidated		$	17,853	$	5,956	$	2,066	$	3,890	$	1,726
			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 Communications(a)		$	10,757	$	4,400	$	1,584	$	2,816	$	1,145
	NBCUniversal
		Cable Networks		2,505		895		189		706		11
		Broadcast Television		2,621		122		27		95		11
		Filmed Entertainment		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		-
	NBCUniversal			6,876		1,311		365		946		291
	Corporate and Other			174		-153		21		-174		12
	Eliminations(c)			-399		-20		-		-20		-
	Comcast Consolidated		$	17,408	$	5,538	$	1,970	$	3,568	$	1,448
Cable Communications Segment Revenue Sources			Three Months Ended
			31-Mar
			2015		2014
	Residential:
		Video	46.6	%	48.1	%
		High-speed Internet	26.6	%	25.6	%
		Voice	7.9	%	8.5	%
	Business services		9.7	%	8.5	%
	Advertising		4.4	%	4.7	%
	Other		4.8	%	4.6	%
	Total		100	%	100	%
NBCUniversal Media, LLC [Member]
Financial Data by Business Segment			Three Months Ended March 31, 2015
	(in millions)			Revenue(c)		Operating Income (Loss) Before Depreciation and Amortization(d)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks		$	2,359	$	898	$	184	$	714	$	6
	Broadcast Television			2,248		182		29		153		11
	Filmed Entertainment			1,446		293		5		288		1
	Theme Parks			651		263		66		197		162
	Headquarters and Other(a)			4		-140		80		-220		88
	Eliminations(b)			-104		-2		-		-2		-
	Total		$	6,604	$	1,494	$	364	$	1,130	$	268
			Three Months Ended March 31, 2014
	(in millions)			Revenue(c)		Operating Income (Loss) Before Depreciation and Amortization(d)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks		$	2,505	$	895	$	189	$	706	$	11
	Broadcast Television			2,621		122		27		95		11
	Filmed Entertainment			1,351		288		5		283		1
	Theme Parks			487		170		69		101		144
	Headquarters and Other(a)			2		-163		75		-238		124
	Eliminations(b)			-90		-1		-		-1		-
	Total		$	6,876	$	1,311	$	365	$	946	$	291

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Condensed Consolidating Financial Information [Abstract]
Condensed Consolidating Financial Statements	Condensed Consolidating Balance Sheet
	31-Mar-15
	(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	$	-	$	-	$	-	$	-	$	339	$	3,598	$	-	$	3,937
		Investments		-		-		-		-		-		158		-		158
		Receivables, net		-		-		-		-		-		6,144		-		6,144
		Programming rights		-		-		-		-		-		945		-		945
		Other current assets		279		-		-		-		64		1,394		-		1,737
	Total current assets			279		-		-		-		403		12,239		-		12,921
	Film and television costs			-		-		-		-		-		5,637		-		5,637
	Investments			31		-		-		-		372		2,832		-		3,235
	Investments in and amounts due from subsidiaries eliminated upon consolidation			82,713		105,551		112,432		60,289		41,900		101,682		-504,567		-
	Property and equipment, net			200		-		-		-		-		30,927		-		31,127
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,302		-		27,302
	Other intangible assets, net			10		-		-		-		-		16,842		-		16,852
	Other noncurrent assets, net			1,201		148		-		-		97		1,970		-1,097		2,319
	Total assets		$	84,434	$	105,699	$	112,432	$	60,289	$	42,772	$	258,795	$	-505,664	$	158,757
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	7	$	-	$	-	$	-	$	-	$	6,150	$	-	$	6,157
		Accrued participations and residuals		-		-		-		-		-		1,387		-		1,387
		Accrued expenses and other current liabilities		1,534		283		343		21		407		4,190		-		6,778
		Current portion of long-term debt		1,761		-		-		676		1,003		740		-		4,180
	Total current liabilities			3,302		283		343		697		1,410		12,467		-		18,502
	Long-term debt, less current portion			26,566		126		1,828		822		9,217		4,394		-		42,953
	Deferred income taxes			-		682		-		-		67		33,059		-953		32,855
	Other noncurrent liabilities			2,395		-		-		-		1,103		7,483		-144		10,837
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,099		-		1,099
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		52,141		104,608		110,261		58,770		30,975		199,953		-504,567		52,141
	Total Comcast Corporation
		shareholders’ equity		52,171		104,608		110,261		58,770		30,975		199,953		-504,567		52,171
	Noncontrolling interests			-		-		-		-		-		340		-		340
	Total equity			52,171		104,608		110,261		58,770		30,975		200,293		-504,567		52,511
	Total liabilities and equity		$	84,434	$	105,699	$	112,432	$	60,289	$	42,772	$	258,795	$	-505,664	$	158,757
	Condensed Consolidating Balance Sheet
	31-Dec-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	$	-	$	-	$	-	$	-	$	385	$	3,525	$	-	$	3,910
		Investments		-		-		-		-		-		602		-		602
		Receivables, net		-		-		-		-		-		6,321		-		6,321
		Programming rights		-		-		-		-		-		839		-		839
		Other current assets		267		-		-		-		41		1,551		-		1,859
	Total current assets			267		-		-		-		426		12,838		-		13,531
	Film and television costs			-		-		-		-		-		5,727		-		5,727
	Investments			36		-		-		-		378		2,721		-		3,135
	Investments in and amounts due from subsidiaries eliminated upon consolidation			84,142		103,420		110,323		58,677		41,239		98,152		-495,953		-
	Property and equipment, net			199		-		-		-		-		30,754		-		30,953
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,316		-		27,316
	Other intangible assets, net			11		-		-		-		-		16,969		-		16,980
	Other noncurrent assets, net			1,224		148		-		-		92		1,949		-1,080		2,333
	Total assets		$	85,879	$	103,568	$	110,323	$	58,677	$	42,135	$	255,790	$	-497,033	$	159,339
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	19	$	-	$	-	$	1	$	-	$	5,618	$	-	$	5,638
		Accrued participations and residuals		-		-		-		-		-		1,347		-		1,347
		Accrued expenses and other current liabilities		1,547		283		233		47		331		3,767		-		6,208
		Current portion of long-term debt		1,650		-		-		677		1,006		884		-		4,217
	Total current liabilities			3,216		283		233		725		1,337		11,616		-		17,410
	Long-term debt, less current portion			27,616		126		1,827		822		9,218		4,408		-		44,017
	Deferred income taxes			-		701		-		-		67		33,127		-936		32,959
Other noncurrent liabilities			2,336		-		-		-		1,143		7,484		-144		10,819
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,066		-		1,066
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		52,681		102,458		108,263		57,130		30,370		197,732		-495,953		52,681
Total Comcast Corporation shareholders’ equity			52,711		102,458		108,263		57,130		30,370		197,732		-495,953		52,711
Noncontrolling interests			-		-		-		-		-		357		-		357
Total equity			52,711		102,458		108,263		57,130		30,370		198,089		-495,953		53,068
Total liabilities and equity		$	85,879	$	103,568	$	110,323	$	58,677	$	42,135	$	255,790	$	-497,033	$	159,339
Condensed Consolidating Statement of Income
For the Three Months Ended March 31, 2015
(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	$	-	$	-	$	-	$	-	$	-	$	17,853	$	-	$	17,853
	Management fee revenue		244		-		237		150		-		-		-631		-
			244		-		237		150		-		17,853		-631		17,853
Costs and Expenses:
	Programming and production		-		-		-		-		-		5,463		-		5,463
	Other operating and administrative		226		-		237		150		237		4,860		-631		5,079
	Advertising, marketing and promotion		-		-		-		-		-		1,355		-		1,355
	Depreciation		8		-		-		-		-		1,626		-		1,634
	Amortization		1		-		-		-		-		431		-		432
			235		-		237		150		237		13,735		-631		13,963
Operating income (loss)			9		-		-		-		-237		4,118		-		3,890
Other Income (Expense):
	Interest expense		-410		-3		-44		-29		-120		-50		-		-656
	Investment income (loss), net		1		2		-		-		-6		36		-		33
	Equity in net income
	(losses) of investees, net		2,322		2,226		1,973		1,646		1,231		885		-10,250		33
	Other income (expense), net		-5		-		-		-		-11		118		-		102
			1,908		2,225		1,929		1,617		1,094		989		-10,250		-488
Income (loss) before income taxes			1,917		2,225		1,929		1,617		857		5,107		-10,250		3,402
Income tax (expense) benefit			142		-		15		10		-5		-1,423		-		-1,261
Net income (loss)			2,059		2,225		1,944		1,627		852		3,684		-10,250		2,141
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-82		-		-82
Net income (loss) attributable
	to Comcast Corporation	$	2,059	$	2,225	$	1,944	$	1,627	$	852	$	3,602	$	-10,250	$	2,059
Comprehensive income (loss)
	attributable to Comcast Corporation	$	2,017	$	2,209	$	1,943	$	1,626	$	801	$	3,601	$	-10,180	$	2,017
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		4,629		-594		4,749
	Advertising, marketing and promotion		-		-		-		-		-		1,213		-		1,213
	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 Cash Flows
For the Three Months Ended March 31, 2015
(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		$	-294	$	-1	$	82	$	-48	$	-361	$	5,867	$	-	$	5,245
Investing Activities
	Net transactions with affiliates		3,609		1		-82		48		321		-3,897		-		-
	Capital expenditures		-6		-		-		-		-		-1,720		-		-1,726
	Cash paid for intangible assets		-		-		-		-		-		-273		-		-273
	Acquisitions and construction of real estate properties		-		-		-		-		-		-24		-		-24
	Proceeds from sales of businesses and investments		-		-		-		-		-		180		-		180
	Purchases of investments		-		-		-		-		-		-32		-		-32
	Other		-		-		-		-		-5		186		-		181
Net cash provided by (used in) investing activities			3,603		1		-82		48		316		-5,580		-		-1,694
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-		-		-		-		-		-150		-		-150
	Proceeds from borrowings		-		-		-		-		-		-		-		-
	Repurchases and repayments of debt		-900		-		-		-		-1		-8		-		-909
	Repurchases and retirements of common stock		-2,000		-		-		-		-		-		-		-2,000
	Dividends paid		-572		-		-		-		-		-		-		-572
	Issuances of common stock		28		-		-		-		-		-		-		28
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-62		-		-62
	Other		135		-		-		-		-		6		-		141
Net cash provided by (used in) financing activities			-3,309		-		-		-		-1		-214		-		-3,524
Increase (decrease) in cash and cash equivalents			-		-		-		-		-46		73		-		27
Cash and cash equivalents, beginning of period			-		-		-		-		385		3,525		-		3,910
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	339	$	3,598	$	-	$	3,937
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

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share
Net income attributable to Parent	$2,059	$1,871
Basic shares attributable to Comcast Corporation shareholders	2,520	2,603
Assumed exercise or issuance of shares relating to stock plans	36	42
Diluted shares attributable to Comcast Corporation shareholders	2,556	2,645
Basic earnings per common share attributable to Comcast Corporation shareholders	$0.82	$0.72
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.81	$0.71

Significant_Transactions_Narra

Significant Transactions (Narrative) (Details) (Transaction-Related Expenses Member, USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Transaction-Related Expenses Member
Significant Transactions [Line Items]
Other operating and administrative expenses	$99	$17

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Other noncurrent liabilities	$10,837,000,000	$10,819,000,000
NBCUniversal Media, LLC [Member]
Borrowing margin for LIBOR based borrowings	1.00%
Other noncurrent liabilities	3,692,000,000	3,722,000,000
Nbcuniversal Holdings Preferred Stock [Member] | NBCUniversal Media, LLC [Member]
Preferred stock liquidation preference value	9,400,000,000
Preferred stock dividend rate percentage	8.25%
Carrying Value Of Related Party Contractual Obligation [Member] | NBCUniversal Media, LLC [Member]
Other noncurrent liabilities	383,000,000
Comcast Corporation And NBCUniversal Media LLC Revolving Credit Agreement [Member] | NBCUniversal Media, LLC [Member]
Revolving Credit Agreement Capacity	$3,000,000,000

Related_Party_Transactions_Con

Related Party Transactions - Consolidated Balance Sheet (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Receivables, net	$6,144	$6,321
Accounts payable and accrued expenses related to trade creditors	6,157	5,638
Accrued expenses and other current liabilities	5,808	5,293
Other noncurrent liabilities	10,837	10,819
NBCUniversal Media, LLC [Member]
Receivables, net	4,891	4,842
Note receivable from Comcast	135	0
Accounts payable and accrued expenses related to trade creditors	1,382	1,388
Accrued expenses and other current liabilities	1,427	1,422
Note payable to Comcast	0	865
Other noncurrent liabilities	3,692	3,722
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]
Receivables, net	241	229
Note receivable from Comcast	135	0
Accounts payable and accrued expenses related to trade creditors	38	47
Accrued expenses and other current liabilities	9	8
Note payable to Comcast	0	865
Other noncurrent liabilities	$402	$383

Related_Party_Transactions_Con1

Related Party Transactions - Consolidated Statement of Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$17,853,000,000	$17,408,000,000
NBCUniversal Media, LLC [Member]
Revenue	6,604,000,000	6,876,000,000
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]
Revenue	342,000,000	361,000,000
Operating costs and expenses	-50,000,000	-37,000,000
Other income (expense)	($9,000,000)	($9,000,000)

Film_and_Television_Costs_Film

Film and Television Costs (Film and Television Costs)(Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Theatrical film costs
Released, less amortization	$1,244	$1,371
Completed, not released	444	71
In production and in development	952	1,189
Total film costs	2,640	2,631
Television costs
Released, less amortization	1,361	1,273
In production and in development	407	505
Total television costs	1,768	1,778
Programming rights, less amortization	2,174	2,157
Total film costs, television costs and programming rights	6,582	6,566
Less: Current portion of programming rights	945	839
Film and television costs	5,637	5,727
NBCUniversal Media, LLC [Member]
Theatrical film costs
Released, less amortization	1,244	1,371
Completed, not released	444	71
In production and in development	952	1,189
Total film costs	2,640	2,631
Television costs
Released, less amortization	1,361	1,273
In production and in development	407	505
Total television costs	1,768	1,778
Programming rights, less amortization	2,145	2,130
Total film costs, television costs and programming rights	6,553	6,539
Less: Current portion of programming rights	925	825
Film and television costs	$5,628	$5,714

Investments_Details

Investments (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Fair value method	$182	$662
Equity method	1,149	1,019
Cost method	2,062	2,056
Total Investments	3,393	3,737
Less: Current investments	158	602
Noncurrent investments	3,235	3,135
NBCUniversal Media, LLC [Member]
Fair value method	10	10
Equity method	971	840
Cost method	24	32
Total Investments	1,005	882
Less: Current investments	52	0
Noncurrent investments	953	882
Air Touch [Member]
Cost method	1,572	1,568
Other Investment [Member]
Equity method	534	517
Cost method	490	488
Other Investment [Member] | NBCUniversal Media, LLC [Member]
Equity method	356	338
The Weather Channel [Member]
Equity method	336	335
The Weather Channel [Member] | NBCUniversal Media, LLC [Member]
Equity method	336	335
Hulu [Member]
Equity method	279	167
Hulu [Member] | NBCUniversal Media, LLC [Member]
Equity method	$279	$167

Investments_Investment_Income_

Investments (Investment Income (Loss), Net) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Gains on sales and exchanges of investments, net	$0	$83
Investment impairment losses	-15	-5
Unrealized gains (losses) on securities underlying prepaid forward sale agreements	42	-113
Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments	-38	117
Interest and dividend income	28	28
Other, net	16	3
Investment income (loss), net	33	113
NBCUniversal Media, LLC [Member]
Investment income (loss), net	($2)	$6

Investments_Fair_Value_Method_

Investments (Fair Value Method Investments) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Prepaid forward sale liabilities carrying value	$0
Fair Value Equity Securities Settlement	$517

Investments_Cost_Method_Invest

Investments (Cost Method Investments) (Details) (Air Touch [Member], USD $)	Mar. 31, 2015
Air Touch [Member]
Fair value of AirTouch preferred stock related to redeemable preferred shares	$1,700,000,000
Fair value of redeemable preferred shares	$1,700,000,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Total debt	$47,100,000,000
Long-term Debt, Fair Value	54,900,000,000
Amounts available under revolving credit facilities	6,600,000,000
NBCUniversal Media, LLC [Member]
Total debt	10,200,000,000
Long-term Debt, Fair Value	11,600,000,000
Comcast ownership in cable holding company subsidiaries	100.00%
NBCUniversal Enterprise [Member]
Commercial paper	700,000,000
NBCUniversal Enterprise [Member] | NBCUniversal Media, LLC [Member]
Principal amount	4,000,000,000
Preferred stock liquidation preference value	725,000,000
Guarantee Obligations Current Principal Balance	1,350,000,000
Comcast And Comcast Cable Revolving Credit Facility [Member] | NBCUniversal Media, LLC [Member]
Debt Instrument, Maturity Date, Description	2017
Revolver Line of credit amount outstanding	0
Guarantee Obligations Current Principal Balance	6,250,000,000
Comcast And Comcast Cable Debt Securities [Member] | NBCUniversal Media, LLC [Member]
Guarantee Obligations Current Principal Balance	31,700,000,000
NBCUniversal Enterprise Credit Facility [Member]
Amounts available under revolving credit facilities	$650,000,000

Longterm_Debt_Debt_Repayments_

Long-term Debt (Debt Repayments) (Details) (USD $)	3 Months Ended		1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015
Repurchases and repayments of debt	$909	$2,260
NBCUniversal Media, LLC [Member]
Repurchases and repayments of debt	1	1
Senior 6.50% Notes Due 2015 [Member]
Repurchases and repayments of debt	900
Interest rate	6.50%
Maturity date	2015
Senior 3.65% Notes Due 2015 [Member]
Repurchases and repayments of debt			1,000
Interest rate			3.65%
Maturity date			2015
Senior 3.65% Notes Due 2015 [Member] | NBCUniversal Media, LLC [Member]
Repurchases and repayments of debt			$1,000
Interest rate			3.65%
Maturity date			2015

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Trading securities	$42	$523
Available-for-sale securities	132	132
Interest rate swap agreements	91	84
Other [assets]	56	71
Fair Value, Assets Measured on Recurring Basis, Total	321	810
Derivative component of prepaid forward sale agreements and indexed debt instruments	3	361
Contractual obligations	904	883
Contingent consideration	632	644
Other [liabilities]	50	8
Fair Value Liabilities Measured On Recurring Basis, Total	1,589	1,896
Fair Value, Inputs, Level 1 [Member]
Trading securities	42
Available-for-sale securities	1
Interest rate swap agreements	0
Other [assets]	0
Fair Value, Assets Measured on Recurring Basis, Total	43
Derivative component of prepaid forward sale agreements and indexed debt instruments	0
Contractual obligations	0
Contingent consideration	0
Other [liabilities]	0
Fair Value Liabilities Measured On Recurring Basis, Total	0
Fair Value, Inputs, Level 2 [Member]
Trading securities	0
Available-for-sale securities	121
Interest rate swap agreements	91
Other [assets]	48
Fair Value, Assets Measured on Recurring Basis, Total	260
Derivative component of prepaid forward sale agreements and indexed debt instruments	3
Contractual obligations	0
Contingent consideration	0
Other [liabilities]	50
Fair Value Liabilities Measured On Recurring Basis, Total	53
Fair Value, Inputs, Level 3 [Member]
Trading securities	0
Available-for-sale securities	10
Interest rate swap agreements	0
Other [assets]	8
Fair Value, Assets Measured on Recurring Basis, Total	18
Derivative component of prepaid forward sale agreements and indexed debt instruments	0
Contractual obligations	904
Contingent consideration	632
Other [liabilities]	0
Fair Value Liabilities Measured On Recurring Basis, Total	$1,536

Fair_Value_Disclosure_Rollforw

Fair Value Disclosure Rollforward (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
NBCUniversal Enterprise [Member]
Fair value of redeemable preferred stock	$764
Contractual Obligations [Member]
Beginning balance	883
Fair value adjustments	40
Payments	-19
Ending balance	904
Contractual Obligations [Member] | NBCUniversal Media, LLC [Member]
Beginning balance	883
Fair value adjustments	40
Payments	-19
Ending balance	904
Contingent Consideration [Member]
Beginning balance	644
Fair value adjustments	7
Payments	-19
Ending balance	$632
Maximum [Member]
Discount Rate Used To Determine Fair Value	13.00%
Maximum [Member] | NBCUniversal Media, LLC [Member]
Discount Rate Used To Determine Fair Value	13.00%
Minimum [Member]
Discount Rate Used To Determine Fair Value	5.00%
Minimum [Member] | NBCUniversal Media, LLC [Member]
Discount Rate Used To Determine Fair Value	12.00%

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015
Number of stock options granted	17.6
Number of restricted share units granted	5.1
Weighted average fair value of stock options granted	$11.79
Weighted average fair value of restricted share units granted	$59.50
Stock Options [Member]
Unrecognized pretax compensation expense on nonvested awards	$461
Restricted Share Units [Member]
Unrecognized pretax compensation expense on nonvested awards	$725

ShareBased_Compensation_Recogn

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Recognized share-based compensation expense	$101	$90
NBCUniversal Media, LLC [Member]
Recognized share-based compensation expense	21	18
Stock Options [Member]
Recognized share-based compensation expense	35	36
Stock Options [Member] | NBCUniversal Media, LLC [Member]
Recognized share-based compensation expense	2	3
Restricted Share Units [Member]
Recognized share-based compensation expense	58	48
Restricted Share Units [Member] | NBCUniversal Media, LLC [Member]
Recognized share-based compensation expense	17	13
Employee Stock Purchase Plan [Member]
Recognized share-based compensation expense	8	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, 2015	Dec. 31, 2014
In Millions, unless otherwise specified
Receivables, gross	$6,634	$6,885
Less: Allowance for returns and customer incentives	297	359
Less: Allowance for doubtful accounts	193	205
Receivables, net	6,144	6,321
NBCUniversal Media, LLC [Member]
Receivables, gross	5,248	5,258
Less: Allowance for returns and customer incentives	294	356
Less: Allowance for doubtful accounts	63	60
Receivables, net	$4,891	$4,842

Supplemental_Financial_Informa3

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Millions, unless otherwise specified
Unrealized gains (losses) on marketable securities	$1		$47
Deferred gains (losses) on cash flow hedges	-6		-50
Unrecognized gains (losses) on employee benefit obligations	-68		71
Cumulative translation adjustments	-115		-35
Accumulated other comprehensive income (loss), net of deferred taxes	-188	-146	33
NBCUniversal Media, LLC [Member]
Deferred gains (losses) on cash flow hedges	32		-6
Unrecognized gains (losses) on employee benefit obligations	-61		46
Cumulative translation adjustments	-181		-53
Accumulated other comprehensive income (loss), net of deferred taxes	($210)	($159)	($13)

Supplemental_Financial_Informa4

Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net income	$2,141,000,000	$1,938,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,066,000,000	1,970,000,000
Share-based compensation	135,000,000	119,000,000
Noncash interest expense (income), net	51,000,000	42,000,000
Equity in net (income) losses of investees, net	-33,000,000	-32,000,000
Cash received from investees	22,000,000	18,000,000
Net (gain) loss on investment activity and other	-121,000,000	-59,000,000
Deferred income taxes	-119,000,000	-226,000,000
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	119,000,000	195,000,000
Film and television costs, net	-38,000,000	154,000,000
Accounts payable and accrued expenses related to trade creditors (cash flow)	372,000,000	82,000,000
Other operating assets and liabilities	650,000,000	285,000,000
Net cash provided by operating activities	5,245,000,000	4,486,000,000
NBCUniversal Media, LLC [Member]
Net income	918,000,000	741,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	364,000,000	365,000,000
Equity in net (income) losses of investees, net	-20,000,000	-18,000,000
Cash received from investees	12,000,000	12,000,000
Net (gain) loss on investment activity and other	46,000,000	21,000,000
Deferred income taxes	3,000,000	16,000,000
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Current and noncurrent receivables, net	-106,000,000	55,000,000
Film and television costs, net	-36,000,000	148,000,000
Accounts payable and accrued expenses related to trade creditors (cash flow)	16,000,000	-117,000,000
Other operating assets and liabilities	5,000,000	-467,000,000
Net cash provided by operating activities	$1,202,000,000	$756,000,000

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, 2015	Mar. 31, 2014
Interest	$691	$623
Income taxes	118	186
NBCUniversal Media, LLC [Member]
Interest	33	36
Income taxes	$40	$53

Supplemental_Financial_Informa6

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) (USD $)	3 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015
Dividends payable, amount	$630
Dividends payable, amount per share	$0.25
Capital expenditures incurred but not yet paid	978
Fair Value Equity Securities Settlement	517
Capital contribution accrued but not yet paid	123
NBCUniversal Media, LLC [Member]
Capital expenditures incurred but not yet paid	153
Capital contribution accrued but not yet paid	$123

Financial_Data_by_Business_Seg2

Financial Data by Business Segment (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue	$17,853,000,000	$17,408,000,000
Operating income (loss) before depreciation and amortization	5,956,000,000	5,538,000,000
Depreciation and amortization	2,066,000,000	1,970,000,000
Operating income (loss)	3,890,000,000	3,568,000,000
Capital expenditures	1,726,000,000	1,448,000,000
NBCUniversal Media, LLC [Member]
Revenue	6,604,000,000	6,876,000,000
Operating income (loss) before depreciation and amortization	1,494,000,000	1,311,000,000
Depreciation and amortization	364,000,000	365,000,000
Operating income (loss)	1,130,000,000	946,000,000
Capital expenditures	268,000,000	291,000,000
Cable Communications [Member]
Revenue	11,430,000,000	10,757,000,000
Operating income (loss) before depreciation and amortization	4,674,000,000	4,400,000,000
Depreciation and amortization	1,675,000,000	1,584,000,000
Operating income (loss)	2,999,000,000	2,816,000,000
Capital expenditures	1,445,000,000	1,145,000,000
Cable segment revenue types as percentage of total cable revenue	100.00%	100.00%
Cable Networks [Member]
Revenue	2,359,000,000	2,505,000,000
Operating income (loss) before depreciation and amortization	898,000,000	895,000,000
Depreciation and amortization	184,000,000	189,000,000
Operating income (loss)	714,000,000	706,000,000
Capital expenditures	6,000,000	11,000,000
Cable Networks [Member] | NBCUniversal Media, LLC [Member]
Revenue	2,359,000,000	2,505,000,000
Operating income (loss) before depreciation and amortization	898,000,000	895,000,000
Depreciation and amortization	184,000,000	189,000,000
Operating income (loss)	714,000,000	706,000,000
Capital expenditures	6,000,000	11,000,000
Broadcast Television [Member]
Revenue	2,248,000,000	2,621,000,000
Operating income (loss) before depreciation and amortization	182,000,000	122,000,000
Depreciation and amortization	29,000,000	27,000,000
Operating income (loss)	153,000,000	95,000,000
Capital expenditures	11,000,000	11,000,000
Broadcast Television [Member] | NBCUniversal Media, LLC [Member]
Revenue	2,248,000,000	2,621,000,000
Operating income (loss) before depreciation and amortization	182,000,000	122,000,000
Depreciation and amortization	29,000,000	27,000,000
Operating income (loss)	153,000,000	95,000,000
Capital expenditures	11,000,000	11,000,000
Filmed Entertainment [Member]
Revenue	1,446,000,000	1,351,000,000
Operating income (loss) before depreciation and amortization	293,000,000	288,000,000
Depreciation and amortization	5,000,000	5,000,000
Operating income (loss)	288,000,000	283,000,000
Capital expenditures	1,000,000	1,000,000
Filmed Entertainment [Member] | NBCUniversal Media, LLC [Member]
Revenue	1,446,000,000	1,351,000,000
Operating income (loss) before depreciation and amortization	293,000,000	288,000,000
Depreciation and amortization	5,000,000	5,000,000
Operating income (loss)	288,000,000	283,000,000
Capital expenditures	1,000,000	1,000,000
Theme Parks [Member]
Revenue	651,000,000	487,000,000
Operating income (loss) before depreciation and amortization	263,000,000	170,000,000
Depreciation and amortization	66,000,000	69,000,000
Operating income (loss)	197,000,000	101,000,000
Capital expenditures	162,000,000	144,000,000
Theme Parks [Member] | NBCUniversal Media, LLC [Member]
Revenue	651,000,000	487,000,000
Operating income (loss) before depreciation and amortization	263,000,000	170,000,000
Depreciation and amortization	66,000,000	69,000,000
Operating income (loss)	197,000,000	101,000,000
Capital expenditures	162,000,000	144,000,000
Headquarters And Other [Member]
Revenue	4,000,000	2,000,000
Operating income (loss) before depreciation and amortization	-140,000,000	-163,000,000
Depreciation and amortization	80,000,000	75,000,000
Operating income (loss)	-220,000,000	-238,000,000
Capital expenditures	88,000,000	124,000,000
Headquarters And Other [Member] | NBCUniversal Media, LLC [Member]
Revenue	4,000,000	2,000,000
Operating income (loss) before depreciation and amortization	-140,000,000	-163,000,000
Depreciation and amortization	80,000,000	75,000,000
Operating income (loss)	-220,000,000	-238,000,000
Capital expenditures	88,000,000	124,000,000
NBCUniversal Eliminations [Member]
Revenue	-104,000,000	-90,000,000
Operating income (loss) before depreciation and amortization	-2,000,000	-1,000,000
Depreciation and amortization	0	0
Operating income (loss)	-2,000,000	-1,000,000
Capital expenditures	0	0
NBCUniversal Eliminations [Member] | NBCUniversal Media, LLC [Member]
Revenue	-104,000,000	-90,000,000
Operating income (loss) before depreciation and amortization	-2,000,000	-1,000,000
Depreciation and amortization	0	0
Operating income (loss)	-2,000,000	-1,000,000
Capital expenditures	0	0
NBCUniversal [Member]
Revenue	6,604,000,000	6,876,000,000
Operating income (loss) before depreciation and amortization	1,494,000,000	1,311,000,000
Depreciation and amortization	364,000,000	365,000,000
Operating income (loss)	1,130,000,000	946,000,000
Capital expenditures	268,000,000	291,000,000
Corporate and Other [Member]
Revenue	204,000,000	174,000,000
Operating income (loss) before depreciation and amortization	-225,000,000	-153,000,000
Depreciation and amortization	27,000,000	21,000,000
Operating income (loss)	-252,000,000	-174,000,000
Capital expenditures	13,000,000	12,000,000
Eliminations [Member]
Revenue	-385,000,000	-399,000,000
Operating income (loss) before depreciation and amortization	13,000,000	-20,000,000
Depreciation and amortization	0	0
Operating income (loss)	13,000,000	-20,000,000
Capital expenditures	$0	$0
Cable Communications Segment Revenue Percentage-Video [Member]
Cable segment revenue types as percentage of total cable revenue	46.60%	48.10%
Cable Communications Segment Revenue Percentage - High-speed Internet [Member]
Cable segment revenue types as percentage of total cable revenue	26.60%	25.60%
Cable Communications Segment Revenue Percentage- Voice [Member]
Cable segment revenue types as percentage of total cable revenue	7.90%	8.50%
Cable Communications Segment Revenue Percentage- Business Services [Member]
Cable segment revenue types as percentage of total cable revenue	9.70%	8.50%
Cable Communications Segment Revenue Percentage- Advertising [Member]
Cable segment revenue types as percentage of total cable revenue	4.40%	4.70%
Cable Communications Segment Revenue Percentage- Other [Member]
Cable segment revenue types as percentage of total cable revenue	4.80%	4.60%
Cable Communications Segment Revenue Percentage- Franchise and other regulatory fees [Member]
Cable segment revenue types as percentage of total cable revenue	2.80%	2.80%

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information (Narrative) (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015
Comcast Holdings' ZONES due October 2029 [Member]
Debt Instrument, Maturity Date, Description	Oct-29
Principal amount of debt securities subject to guarantee	$185
Comcast Holdings' ZONES due November 2029 [Member]
Debt Instrument, Maturity Date, Description	Nov-29
Principal amount of debt securities not subject to guarantee	62
NBCUniversal Enterprise Credit Facility [Member]
Debt Instrument, Maturity Date, Description	Mar-18
Principal amount of debt securities subject to guarantee	1,350
Comcast And Comcast Cable Communications LLC [Member]
Debt Instrument, Maturity Date, Description	Jun-17
Principal amount of debt securities subject to guarantee	6,250
NBCUniversal Enterprise [Member]
Principal amount of debt securities subject to guarantee	$4,000

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Cash and cash equivalents	$3,937	$3,910	$3,054	$1,718
Investments [Current]	158	602
Receivables, net	6,144	6,321
Programming rights	945	839
Other current assets	1,737	1,859
Total current assets	12,921	13,531
Film and television costs	5,637	5,727
Investments	3,235	3,135
Investments in and amounts due from subsidiaries eliminated upon consolidation	0	0
Property and equipment, net	31,127	30,953
Franchise rights	59,364	59,364
Goodwill	27,302	27,316
Other intangible assets, net	16,852	16,980
Other noncurrent assets, net	2,319	2,333
Total assets	158,757	159,339
Accounts payable and accrued expenses related to trade creditors	6,157	5,638
Accrued participations and residuals	1,387	1,347
Accrued expenses and other current liabilities [condensed]	6,778	6,208
Current portion of long-term debt	4,180	4,217
Total current liabilities	18,502	17,410
Long-term debt, less current portion	42,953	44,017
Deferred income taxes	32,855	32,959
Other noncurrent liabilities	10,837	10,819
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,099	1,066
Common stock	30	30
Other shareholders' equity	52,141	52,681
Total Comcast Corporation shareholders' equity	52,171	52,711
Noncontrolling interests	340	357
Total equity	52,511	53,068	51,632	51,058
Total liabilities and equity	158,757	159,339
Comcast Parent [Member]
Cash and cash equivalents	0	0	0	0
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	279	267
Total current assets	279	267
Film and television costs	0	0
Investments	31	36
Investments in and amounts due from subsidiaries eliminated upon consolidation	82,713	84,142
Property and equipment, net	200	199
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	10	11
Other noncurrent assets, net	1,201	1,224
Total assets	84,434	85,879
Accounts payable and accrued expenses related to trade creditors	7	19
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	1,534	1,547
Current portion of long-term debt	1,761	1,650
Total current liabilities	3,302	3,216
Long-term debt, less current portion	26,566	27,616
Deferred income taxes	0	0
Other noncurrent liabilities	2,395	2,336
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	30	30
Other shareholders' equity	52,141	52,681
Total Comcast Corporation shareholders' equity	52,171	52,711
Noncontrolling interests	0	0
Total equity	52,171	52,711
Total liabilities and equity	84,434	85,879
Comcast Holdings [Member]
Cash and cash equivalents	0	0	0	0
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	105,551	103,420
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	148	148
Total assets	105,699	103,568
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	283	283
Current portion of long-term debt	0	0
Total current liabilities	283	283
Long-term debt, less current portion	126	126
Deferred income taxes	682	701
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	0	0
Other shareholders' equity	104,608	102,458
Total Comcast Corporation shareholders' equity	104,608	102,458
Noncontrolling interests	0	0
Total equity	104,608	102,458
Total liabilities and equity	105,699	103,568
CCCL Parent [Member]
Cash and cash equivalents	0	0	0	0
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	112,432	110,323
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	0	0
Total assets	112,432	110,323
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	343	233
Current portion of long-term debt	0	0
Total current liabilities	343	233
Long-term debt, less current portion	1,828	1,827
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	0	0
Other shareholders' equity	110,261	108,263
Total Comcast Corporation shareholders' equity	110,261	108,263
Noncontrolling interests	0	0
Total equity	110,261	108,263
Total liabilities and equity	112,432	110,323
Combined CCHMO Parents [Member]
Cash and cash equivalents	0	0	0	0
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	60,289	58,677
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	0	0
Total assets	60,289	58,677
Accounts payable and accrued expenses related to trade creditors	0	1
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	21	47
Current portion of long-term debt	676	677
Total current liabilities	697	725
Long-term debt, less current portion	822	822
Deferred income taxes	0	0
Other noncurrent liabilities	0	0
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	0	0
Other shareholders' equity	58,770	57,130
Total Comcast Corporation shareholders' equity	58,770	57,130
Noncontrolling interests	0	0
Total equity	58,770	57,130
Total liabilities and equity	60,289	58,677
NBCUniversal Media Parent [Member]
Cash and cash equivalents	339	385	506	336
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	64	41
Total current assets	403	426
Film and television costs	0	0
Investments	372	378
Investments in and amounts due from subsidiaries eliminated upon consolidation	41,900	41,239
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	97	92
Total assets	42,772	42,135
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	407	331
Current portion of long-term debt	1,003	1,006
Total current liabilities	1,410	1,337
Long-term debt, less current portion	9,217	9,218
Deferred income taxes	67	67
Other noncurrent liabilities	1,103	1,143
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	0	0
Other shareholders' equity	30,975	30,370
Total Comcast Corporation shareholders' equity	30,975	30,370
Noncontrolling interests	0	0
Total equity	30,975	30,370
Total liabilities and equity	42,772	42,135
Comcast Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	3,598	3,525	2,548	1,382
Investments [Current]	158	602
Receivables, net	6,144	6,321
Programming rights	945	839
Other current assets	1,394	1,551
Total current assets	12,239	12,838
Film and television costs	5,637	5,727
Investments	2,832	2,721
Investments in and amounts due from subsidiaries eliminated upon consolidation	101,682	98,152
Property and equipment, net	30,927	30,754
Franchise rights	59,364	59,364
Goodwill	27,302	27,316
Other intangible assets, net	16,842	16,969
Other noncurrent assets, net	1,970	1,949
Total assets	258,795	255,790
Accounts payable and accrued expenses related to trade creditors	6,150	5,618
Accrued participations and residuals	1,387	1,347
Accrued expenses and other current liabilities [condensed]	4,190	3,767
Current portion of long-term debt	740	884
Total current liabilities	12,467	11,616
Long-term debt, less current portion	4,394	4,408
Deferred income taxes	33,059	33,127
Other noncurrent liabilities	7,483	7,484
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,099	1,066
Common stock	0	0
Other shareholders' equity	199,953	197,732
Total Comcast Corporation shareholders' equity	199,953	197,732
Noncontrolling interests	340	357
Total equity	200,293	198,089
Total liabilities and equity	258,795	255,790
Elimination and Consolidation Adjustments [Member]
Cash and cash equivalents	0	0	0	0
Investments [Current]	0	0
Receivables, net	0	0
Programming rights	0	0
Other current assets	0	0
Total current assets	0	0
Film and television costs	0	0
Investments	0	0
Investments in and amounts due from subsidiaries eliminated upon consolidation	-504,567	-495,953
Property and equipment, net	0	0
Franchise rights	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other noncurrent assets, net	-1,097	-1,080
Total assets	-505,664	-497,033
Accounts payable and accrued expenses related to trade creditors	0	0
Accrued participations and residuals	0	0
Accrued expenses and other current liabilities [condensed]	0	0
Current portion of long-term debt	0	0
Total current liabilities	0	0
Long-term debt, less current portion	0	0
Deferred income taxes	-953	-936
Other noncurrent liabilities	-144	-144
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0
Common stock	0	0
Other shareholders' equity	-504,567	-495,953
Total Comcast Corporation shareholders' equity	-504,567	-495,953
Noncontrolling interests	0	0
Total equity	-504,567	-495,953
Total liabilities and equity	($505,664)	($497,033)

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Service revenue	$17,853,000,000	$17,408,000,000
Management fee revenue	0	0
Revenue	17,853,000,000	17,408,000,000
Programming and production	5,463,000,000	5,908,000,000
Other operating and administrative	5,079,000,000	4,749,000,000
Advertising, marketing and promotion	1,355,000,000	1,213,000,000
Depreciation	1,634,000,000	1,569,000,000
Amortization	432,000,000	401,000,000
Costs and expenses, total	13,963,000,000	13,840,000,000
Operating income (loss)	3,890,000,000	3,568,000,000
Interest expense	-656,000,000	-642,000,000
Investment income (loss), net	33,000,000	113,000,000
Equity in net income (losses) of investees, net	33,000,000	32,000,000
Other income (expense), net	102,000,000	-15,000,000
Nonoperating income (Expense), Total	-488,000,000	-512,000,000
Income (loss) before income taxes	3,402,000,000	3,056,000,000
Income tax (expense) benefit	-1,261,000,000	-1,118,000,000
Net income (loss)	2,141,000,000	1,938,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-82,000,000	-67,000,000
Net income (loss) attributable to Parent	2,059,000,000	1,871,000,000
Comprehensive income attributable to Parent	2,017,000,000	1,848,000,000
Elimination and Consolidation Adjustments [Member]
Service revenue	0	0
Management fee revenue	-631,000,000	-594,000,000
Revenue	-631,000,000	-594,000,000
Programming and production	0	0
Other operating and administrative	-631,000,000	-594,000,000
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	-631,000,000	-594,000,000
Operating income (loss)	0	0
Interest expense	0	0
Investment income (loss), net	0	0
Equity in net income (losses) of investees, net	-10,250,000,000	-9,734,000,000
Other income (expense), net	0	0
Nonoperating income (Expense), Total	-10,250,000,000	-9,734,000,000
Income (loss) before income taxes	-10,250,000,000	-9,734,000,000
Income tax (expense) benefit	0	0
Net income (loss)	-10,250,000,000	-9,734,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	-10,250,000,000	-9,734,000,000
Comprehensive income attributable to Parent	-10,180,000,000	-9,719,000,000
Comcast Parent [Member]
Service revenue	0	0
Management fee revenue	244,000,000	230,000,000
Revenue	244,000,000	230,000,000
Programming and production	0	0
Other operating and administrative	226,000,000	93,000,000
Advertising, marketing and promotion	0	0
Depreciation	8,000,000	7,000,000
Amortization	1,000,000	1,000,000
Costs and expenses, total	235,000,000	101,000,000
Operating income (loss)	9,000,000	129,000,000
Interest expense	-410,000,000	-387,000,000
Investment income (loss), net	1,000,000	1,000,000
Equity in net income (losses) of investees, net	2,322,000,000	2,038,000,000
Other income (expense), net	-5,000,000	0
Nonoperating income (Expense), Total	1,908,000,000	1,652,000,000
Income (loss) before income taxes	1,917,000,000	1,781,000,000
Income tax (expense) benefit	142,000,000	90,000,000
Net income (loss)	2,059,000,000	1,871,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	2,059,000,000	1,871,000,000
Comprehensive income attributable to Parent	2,017,000,000	1,848,000,000
Comcast Holdings [Member]
Service revenue	0	0
Management fee revenue	0	0
Revenue	0	0
Programming and production	0	0
Other operating and administrative	0	0
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	0	0
Operating income (loss)	0	0
Interest expense	-3,000,000	-3,000,000
Investment income (loss), net	2,000,000	3,000,000
Equity in net income (losses) of investees, net	2,226,000,000	2,267,000,000
Other income (expense), net	0	0
Nonoperating income (Expense), Total	2,225,000,000	2,267,000,000
Income (loss) before income taxes	2,225,000,000	2,267,000,000
Income tax (expense) benefit	0	0
Net income (loss)	2,225,000,000	2,267,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	2,225,000,000	2,267,000,000
Comprehensive income attributable to Parent	2,209,000,000	2,269,000,000
CCCL Parent [Member]
Service revenue	0	0
Management fee revenue	237,000,000	223,000,000
Revenue	237,000,000	223,000,000
Programming and production	0	0
Other operating and administrative	237,000,000	223,000,000
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	237,000,000	223,000,000
Operating income (loss)	0	0
Interest expense	-44,000,000	-45,000,000
Investment income (loss), net	0	0
Equity in net income (losses) of investees, net	1,973,000,000	2,165,000,000
Other income (expense), net	0	0
Nonoperating income (Expense), Total	1,929,000,000	2,120,000,000
Income (loss) before income taxes	1,929,000,000	2,120,000,000
Income tax (expense) benefit	15,000,000	16,000,000
Net income (loss)	1,944,000,000	2,136,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	1,944,000,000	2,136,000,000
Comprehensive income attributable to Parent	1,943,000,000	2,138,000,000
Combined CCHMO Parents [Member]
Service revenue	0	0
Management fee revenue	150,000,000	141,000,000
Revenue	150,000,000	141,000,000
Programming and production	0	0
Other operating and administrative	150,000,000	141,000,000
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	150,000,000	141,000,000
Operating income (loss)	0	0
Interest expense	-29,000,000	-29,000,000
Investment income (loss), net	0	0
Equity in net income (losses) of investees, net	1,646,000,000	1,511,000,000
Other income (expense), net	0	0
Nonoperating income (Expense), Total	1,617,000,000	1,482,000,000
Income (loss) before income taxes	1,617,000,000	1,482,000,000
Income tax (expense) benefit	10,000,000	10,000,000
Net income (loss)	1,627,000,000	1,492,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	1,627,000,000	1,492,000,000
Comprehensive income attributable to Parent	1,626,000,000	1,493,000,000
NBCUniversal Media Parent [Member]
Service revenue	0	0
Management fee revenue	0	0
Revenue	0	0
Programming and production	0	0
Other operating and administrative	237,000,000	257,000,000
Advertising, marketing and promotion	0	0
Depreciation	0	0
Amortization	0	0
Costs and expenses, total	237,000,000	257,000,000
Operating income (loss)	-237,000,000	-257,000,000
Interest expense	-120,000,000	-124,000,000
Investment income (loss), net	-6,000,000	1,000,000
Equity in net income (losses) of investees, net	1,231,000,000	1,071,000,000
Other income (expense), net	-11,000,000	-4,000,000
Nonoperating income (Expense), Total	1,094,000,000	944,000,000
Income (loss) before income taxes	857,000,000	687,000,000
Income tax (expense) benefit	-5,000,000	-5,000,000
Net income (loss)	852,000,000	682,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0
Net income (loss) attributable to Parent	852,000,000	682,000,000
Comprehensive income attributable to Parent	801,000,000	685,000,000
Comcast Non-Guarantor Subsidiaries [Member]
Service revenue	17,853,000,000	17,408,000,000
Management fee revenue	0	0
Revenue	17,853,000,000	17,408,000,000
Programming and production	5,463,000,000	5,908,000,000
Other operating and administrative	4,860,000,000	4,629,000,000
Advertising, marketing and promotion	1,355,000,000	1,213,000,000
Depreciation	1,626,000,000	1,562,000,000
Amortization	431,000,000	400,000,000
Costs and expenses, total	13,735,000,000	13,712,000,000
Operating income (loss)	4,118,000,000	3,696,000,000
Interest expense	-50,000,000	-54,000,000
Investment income (loss), net	36,000,000	108,000,000
Equity in net income (losses) of investees, net	885,000,000	714,000,000
Other income (expense), net	118,000,000	-11,000,000
Nonoperating income (Expense), Total	989,000,000	757,000,000
Income (loss) before income taxes	5,107,000,000	4,453,000,000
Income tax (expense) benefit	-1,423,000,000	-1,229,000,000
Net income (loss)	3,684,000,000	3,224,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-82,000,000	-67,000,000
Net income (loss) attributable to Parent	3,602,000,000	3,157,000,000
Comprehensive income attributable to Parent	$3,601,000,000	$3,134,000,000

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, 2015	Mar. 31, 2014
Operating Activities
Net cash provided by (used in) operating activities	$5,245	$4,486
Investing Activities
Net transactions with affiliates	0	0
Capital expenditures	-1,726	-1,448
Cash paid for intangible assets	-273	-217
Acquisitions and construction of real estate properties	-24	0
Proceeds from sales of businesses and investments	180	300
Purchases of investments	-32	-37
Other	181	-103
Net cash provided by (used in) investing activities	-1,694	-1,505
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	-150	-364
Proceeds from borrowings	0	2,187
Repurchases and repayments of debt	-909	-2,260
Repurchases and retirements of common stock	-2,000	-750
Dividends paid	-572	-508
Issuances of common stock	28	20
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-62	-66
Other	141	96
Net cash provided by (used in) financing activities	-3,524	-1,645
Increase (decrease) in cash and cash equivalents	27	1,336
Cash and cash equivalents, beginning of period	3,910	1,718
Cash and cash equivalents, end of period	3,937	3,054
Elimination and Consolidation Adjustments [Member]
Operating Activities
Net cash provided by (used in) operating activities	0	0
Investing Activities
Net transactions with affiliates	0	0
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	0	0
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Comcast Parent [Member]
Operating Activities
Net cash provided by (used in) operating activities	-294	-96
Investing Activities
Net transactions with affiliates	3,609	1,370
Capital expenditures	-6	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	-10
Other	0	0
Net cash provided by (used in) investing activities	3,603	1,360
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	-1,350
Proceeds from borrowings	0	2,184
Repurchases and repayments of debt	-900	-1,000
Repurchases and retirements of common stock	-2,000	-750
Dividends paid	-572	-508
Issuances of common stock	28	20
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	135	140
Net cash provided by (used in) financing activities	-3,309	-1,264
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Comcast Holdings [Member]
Operating Activities
Net cash provided by (used in) operating activities	-1	-2
Investing Activities
Net transactions with affiliates	1	2
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	1	2
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
CCCL Parent [Member]
Operating Activities
Net cash provided by (used in) operating activities	82	110
Investing Activities
Net transactions with affiliates	-82	-110
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	-82	-110
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Combined CCHMO Parents [Member]
Operating Activities
Net cash provided by (used in) operating activities	-48	-47
Investing Activities
Net transactions with affiliates	48	47
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	48	47
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	0
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net cash provided by (used in) financing activities	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
NBCUniversal Media Parent [Member]
Operating Activities
Net cash provided by (used in) operating activities	-361	-306
Investing Activities
Net transactions with affiliates	321	483
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Proceeds from sales of businesses and investments	0	0
Purchases of investments	0	-6
Other	-5	0
Net cash provided by (used in) investing activities	316	477
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	-1	-1
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Other	0	0
Net cash provided by (used in) financing activities	-1	-1
Increase (decrease) in cash and cash equivalents	-46	170
Cash and cash equivalents, beginning of period	385	336
Cash and cash equivalents, end of period	339	506
Comcast Non-Guarantor Subsidiaries [Member]
Operating Activities
Net cash provided by (used in) operating activities	5,867	4,827
Investing Activities
Net transactions with affiliates	-3,897	-1,792
Capital expenditures	-1,720	-1,448
Cash paid for intangible assets	-273	-217
Acquisitions and construction of real estate properties	-24	0
Proceeds from sales of businesses and investments	180	300
Purchases of investments	-32	-21
Other	186	-103
Net cash provided by (used in) investing activities	-5,580	-3,281
Financing Activities
Proceeds from (repayments of) short-term borrowings, net	-150	986
Proceeds from borrowings	0	3
Repurchases and repayments of debt	-8	-1,259
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-62	-66
Other	6	-44
Net cash provided by (used in) financing activities	-214	-380
Increase (decrease) in cash and cash equivalents	73	1,166
Cash and cash equivalents, beginning of period	3,525	1,382
Cash and cash equivalents, end of period	$3,598	$2,548