Comcast (CMCSA) 10-Q 23 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Sep-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q3
Trading Symbol	'cmcsa
Entity Registrant Name	'COMCAST CORP
Entity Central Index Key	'0001166691
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
NBCUniversal Media, LLC [Member]	'
Entity Registrant Name	'NBCUniversal Media, LLC
Entity Central Index Key	'0000902739
Entity Filer Category	'Non-accelerated Filer
Class A Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	2,150,368,818
ClassA Special Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	416,484,168
Class B Common Stock [Member]	'
Entity Common Stock, Shares Outstanding	9,444,375

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheet (USD $)	Sep. 30, 2014	Dec. 31, 2013
Current Assets:	'	'
Cash and cash equivalents	$4,547,000,000	$1,718,000,000
Investments [Current]	531,000,000	3,573,000,000
Receivables, net	6,172,000,000	6,376,000,000
Programming rights	992,000,000	928,000,000
Other current assets	1,694,000,000	1,480,000,000
Total current assets	13,936,000,000	14,075,000,000
Film and television costs	5,560,000,000	4,994,000,000
Investments	3,129,000,000	3,770,000,000
Property and equipment, net	30,362,000,000	29,840,000,000
Franchise rights	59,364,000,000	59,364,000,000
Goodwill	27,323,000,000	27,098,000,000
Other intangible assets, net	17,089,000,000	17,329,000,000
Other noncurrent assets, net	2,474,000,000	2,343,000,000
Total assets	159,237,000,000	158,813,000,000
Current Liabilities:	'	'
Accounts payable and accrued expenses related to trade creditors	5,680,000,000	5,528,000,000
Accrued participations and residuals	1,444,000,000	1,239,000,000
Deferred revenue	976,000,000	898,000,000
Accrued expenses and other current liabilities	5,461,000,000	7,967,000,000
Current portion of long-term debt	3,523,000,000	3,280,000,000
Total current liabilities	17,084,000,000	18,912,000,000
Long-term debt, less current portion	44,827,000,000	44,567,000,000
Deferred income taxes	32,227,000,000	31,935,000,000
Other noncurrent liabilities	10,388,000,000	11,384,000,000
Commitments and contingencies	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,058,000,000	957,000,000
Equity:	'	'
Preferred stock - authorized, 20,000,000 shares; issued, zero	0	0
Common stock	30,000,000	30,000,000
Additional paid-in capital	38,977,000,000	38,890,000,000
Retained earnings	21,805,000,000	19,235,000,000
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)	3,000,000	56,000,000
Total Comcast Corporation shareholders' equity	53,298,000,000	50,694,000,000
Noncontrolling interests	355,000,000	364,000,000
Total equity	53,653,000,000	51,058,000,000
Total liabilities and equity	159,237,000,000	158,813,000,000
NBCUniversal Media, LLC [Member]	'	'
Current Assets:	'	'
Cash and cash equivalents	865,000,000	967,000,000
Receivables, net	4,784,000,000	4,911,000,000
Programming rights	976,000,000	903,000,000
Other current assets	779,000,000	615,000,000
Total current assets	7,404,000,000	7,396,000,000
Film and television costs	5,552,000,000	4,983,000,000
Investments	907,000,000	884,000,000
Property and equipment, net	7,989,000,000	7,650,000,000
Goodwill	14,916,000,000	14,882,000,000
Intangible assets, net	14,380,000,000	14,857,000,000
Other noncurrent assets, net	1,181,000,000	1,087,000,000
Total assets	52,329,000,000	51,739,000,000
Current Liabilities:	'	'
Accounts payable and accrued expenses related to trade creditors	1,325,000,000	1,583,000,000
Accrued participations and residuals	1,444,000,000	1,239,000,000
Program obligations	672,000,000	657,000,000
Deferred revenue	862,000,000	846,000,000
Accrued expenses and other current liabilities	1,424,000,000	1,465,000,000
Note payable to Comcast	1,078,000,000	799,000,000
Current portion of long-term debt	1,011,000,000	906,000,000
Total current liabilities	7,816,000,000	7,495,000,000
Long-term debt, less current portion	9,242,000,000	10,259,000,000
Accrued participations residuals and program obligations	1,069,000,000	1,015,000,000
Other noncurrent liabilities	3,514,000,000	3,412,000,000
Commitments and contingencies	'	'
Redeemable noncontrolling interests	322,000,000	231,000,000
Equity:	'	'
Member's capital	30,115,000,000	29,056,000,000
Accumulated other comprehensive income (loss)	-12,000,000	-16,000,000
Total NBCUniversal member's equity	30,103,000,000	29,040,000,000
Noncontrolling interests	263,000,000	287,000,000
Total equity	30,366,000,000	29,327,000,000
Total liabilities and equity	52,329,000,000	51,739,000,000
Class A Common Stock [Member]	'	'
Equity:	'	'
Common stock	25,000,000	25,000,000
Class B Common Stock [Member]	'	'
Equity:	'	'
Common stock	0	0
ClassA Special Common Stock [Member]	'	'
Equity:	'	'
Common stock	$5,000,000	$5,000,000

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheet (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Accumulated depreciation	$44,821	$42,574
Accumulated amortization	9,649	8,874
NBCUniversal Media, LLC [Member]	'	'
Accumulated depreciation	2,051	1,599
Accumulated amortization	$4,430	$4,003
Class A Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	2,515,829,568	2,503,535,883
Common stock, outstanding	2,150,368,818	2,138,075,133
Treasury stock common shares	365,460,750	365,460,750
ClassA Special Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	7,500,000,000	7,500,000,000
Common stock, issued	487,418,932	529,964,944
Common stock, outstanding	416,484,168	459,030,180
Treasury stock common shares	70,934,764	70,934,764
Class B Common Stock [Member]	'	'
Common stock, par value	$0.01	$0.01
Common stock, authorized	75,000,000	75,000,000
Common stock, issued	9,444,375	9,444,375
Common stock, outstanding	9,444,375	9,444,375

Condensed_Consolidated_Stateme

Condensed Consolidated Statement of Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$16,791,000,000	$16,151,000,000	$51,043,000,000	$47,731,000,000
Costs and Expenses:	'	'	'	'
Programming and production	4,772,000,000	4,787,000,000	15,554,000,000	14,418,000,000
Other operating and administrative	5,019,000,000	4,751,000,000	14,695,000,000	13,787,000,000
Advertising, marketing and promotion	1,296,000,000	1,283,000,000	3,748,000,000	3,737,000,000
Depreciation	1,539,000,000	1,520,000,000	4,707,000,000	4,669,000,000
Amortization	420,000,000	396,000,000	1,222,000,000	1,204,000,000
Total costs and expenses	13,046,000,000	12,737,000,000	39,926,000,000	37,815,000,000
Operating income	3,745,000,000	3,414,000,000	11,117,000,000	9,916,000,000
Other Income (Expense):	'	'	'	'
Interest expense	-663,000,000	-639,000,000	-1,953,000,000	-1,928,000,000
Investment income (loss), net	21,000,000	464,000,000	254,000,000	549,000,000
Equity in net income (losses) of investees, net	33,000,000	-130,000,000	87,000,000	-96,000,000
Other income (expense), net	-96,000,000	-310,000,000	-150,000,000	-280,000,000
Nonoperating income (expense)	-705,000,000	-615,000,000	-1,762,000,000	-1,755,000,000
Income before income taxes	3,040,000,000	2,799,000,000	9,355,000,000	8,161,000,000
Income tax expense	-407,000,000	-1,021,000,000	-2,759,000,000	-2,994,000,000
Net income	2,633,000,000	1,778,000,000	6,596,000,000	5,167,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-41,000,000	-46,000,000	-141,000,000	-264,000,000
Net income attributable to Parent	2,592,000,000	1,732,000,000	6,455,000,000	4,903,000,000
Basic earnings per common share attributable to Comcast Corporation shareholders	$1	$0.66	$2.49	$1.86
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.99	$0.65	$2.46	$1.84
Dividends declared per common share	$0.23	$0.20	$0.68	$0.59
NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	5,921,000,000	5,851,000,000	18,813,000,000	17,186,000,000
Costs and Expenses:	'	'	'	'
Programming and production	2,633,000,000	2,803,000,000	9,117,000,000	8,496,000,000
Other operating and administrative	1,363,000,000	1,251,000,000	3,977,000,000	3,623,000,000
Advertising, marketing and promotion	509,000,000	547,000,000	1,558,000,000	1,673,000,000
Depreciation	160,000,000	160,000,000	498,000,000	467,000,000
Amortization	211,000,000	192,000,000	608,000,000	578,000,000
Total costs and expenses	4,876,000,000	4,953,000,000	15,758,000,000	14,837,000,000
Operating income	1,045,000,000	898,000,000	3,055,000,000	2,349,000,000
Other Income (Expense):	'	'	'	'
Interest expense	-125,000,000	-129,000,000	-381,000,000	-386,000,000
Investment income (loss), net	3,000,000	1,000,000	18,000,000	9,000,000
Equity in net income (losses) of investees, net	20,000,000	-132,000,000	49,000,000	-105,000,000
Other income (expense), net	-59,000,000	-298,000,000	-136,000,000	-386,000,000
Nonoperating income (expense)	-161,000,000	-558,000,000	-450,000,000	-868,000,000
Income before income taxes	884,000,000	340,000,000	2,605,000,000	1,481,000,000
Income tax expense	-51,000,000	-62,000,000	-189,000,000	-162,000,000
Net income	833,000,000	278,000,000	2,416,000,000	1,319,000,000
Net income attributable to Parent	$802,000,000	$236,000,000	$2,298,000,000	$1,214,000,000

Condensed_Consolidated_Stateme1

Condensed Consolidated Statement of Income (NBCUniversal) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$16,791,000,000	$16,151,000,000	$51,043,000,000	$47,731,000,000
Costs and Expenses:	'	'	'	'
Programming and production	4,772,000,000	4,787,000,000	15,554,000,000	14,418,000,000
Other operating and administrative	5,019,000,000	4,751,000,000	14,695,000,000	13,787,000,000
Advertising, marketing and promotion	1,296,000,000	1,283,000,000	3,748,000,000	3,737,000,000
Depreciation	1,539,000,000	1,520,000,000	4,707,000,000	4,669,000,000
Amortization	420,000,000	396,000,000	1,222,000,000	1,204,000,000
Total costs and expenses	13,046,000,000	12,737,000,000	39,926,000,000	37,815,000,000
Operating income	3,745,000,000	3,414,000,000	11,117,000,000	9,916,000,000
Other Income (Expense):	'	'	'	'
Interest expense	-663,000,000	-639,000,000	-1,953,000,000	-1,928,000,000
Investment income (loss), net	21,000,000	464,000,000	254,000,000	549,000,000
Equity in net income (losses) of investees, net	33,000,000	-130,000,000	87,000,000	-96,000,000
Other income (expense), net	-96,000,000	-310,000,000	-150,000,000	-280,000,000
Nonoperating income (expense)	-705,000,000	-615,000,000	-1,762,000,000	-1,755,000,000
Income before income taxes	3,040,000,000	2,799,000,000	9,355,000,000	8,161,000,000
Income tax expense	-407,000,000	-1,021,000,000	-2,759,000,000	-2,994,000,000
Net income	2,633,000,000	1,778,000,000	6,596,000,000	5,167,000,000
Net income attributable to Parent	2,592,000,000	1,732,000,000	6,455,000,000	4,903,000,000
N B C Universal Media L L C [Member]	'	'	'	'
Revenue	5,921,000,000	5,851,000,000	18,813,000,000	17,186,000,000
Costs and Expenses:	'	'	'	'
Programming and production	2,633,000,000	2,803,000,000	9,117,000,000	8,496,000,000
Other operating and administrative	1,363,000,000	1,251,000,000	3,977,000,000	3,623,000,000
Advertising, marketing and promotion	509,000,000	547,000,000	1,558,000,000	1,673,000,000
Depreciation	160,000,000	160,000,000	498,000,000	467,000,000
Amortization	211,000,000	192,000,000	608,000,000	578,000,000
Total costs and expenses	4,876,000,000	4,953,000,000	15,758,000,000	14,837,000,000
Operating income	1,045,000,000	898,000,000	3,055,000,000	2,349,000,000
Other Income (Expense):	'	'	'	'
Interest expense	-125,000,000	-129,000,000	-381,000,000	-386,000,000
Investment income (loss), net	3,000,000	1,000,000	18,000,000	9,000,000
Equity in net income (losses) of investees, net	20,000,000	-132,000,000	49,000,000	-105,000,000
Other income (expense), net	-59,000,000	-298,000,000	-136,000,000	-386,000,000
Nonoperating income (expense)	-161,000,000	-558,000,000	-450,000,000	-868,000,000
Income before income taxes	884,000,000	340,000,000	2,605,000,000	1,481,000,000
Income tax expense	-51,000,000	-62,000,000	-189,000,000	-162,000,000
Net income	833,000,000	278,000,000	2,416,000,000	1,319,000,000
Net (income) loss attributable to noncontrolling interests	-31,000,000	-42,000,000	-118,000,000	-105,000,000
Net income attributable to Parent	$802,000,000	$236,000,000	$2,298,000,000	$1,214,000,000

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$2,633,000,000	$1,778,000,000	$6,596,000,000	$5,167,000,000
Unrealized gains (losses) on marketable securities, net of deferred taxes	0	19,000,000	34,000,000	136,000,000
Deferred gains (losses) on cash flow hedges, net of deferred taxes	-4,000,000	45,000,000	-2,000,000	10,000,000
Amounts Reclassified To Net Income:	'	'	'	'
Realized (gains) losses on marketable securities, net of deferred taxes	-1,000,000	-278,000,000	-98,000,000	-301,000,000
Realized (gains) losses on cash flow hedges, net of deferred taxes	38,000,000	-38,000,000	18,000,000	10,000,000
Employee benefit obligations, net of deferred taxes	0	57,000,000	-1,000,000	60,000,000
Currency translation adjustments, net of deferred taxes	-16,000,000	8,000,000	-4,000,000	-23,000,000
Comprehensive income	2,650,000,000	1,591,000,000	6,543,000,000	5,059,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-41,000,000	-46,000,000	-141,000,000	-264,000,000
Other comprehensive (income) loss attributable to noncontrolling interests	0	0	0	9,000,000
Comprehensive income attributable to Parent	2,609,000,000	1,545,000,000	6,402,000,000	4,804,000,000
NBCUniversal Media, LLC [Member]	'	'	'	'
Net income	833,000,000	278,000,000	2,416,000,000	1,319,000,000
Unrealized gains (losses) on marketable securities, net of deferred taxes	-2,000,000	0	3,000,000	0
Deferred gains (losses) on cash flow hedges, net of deferred taxes	11,000,000	-5,000,000	9,000,000	-5,000,000
Amounts Reclassified To Net Income:	'	'	'	'
Employee benefit obligations, net of deferred taxes	0	0	0	-1,000,000
Currency translation adjustments, net of deferred taxes	-26,000,000	13,000,000	-8,000,000	-32,000,000
Comprehensive income	816,000,000	286,000,000	2,420,000,000	1,281,000,000
Net (income) loss attributable to noncontrolling interests	-31,000,000	-42,000,000	-118,000,000	-105,000,000
Comprehensive income attributable to Parent	$785,000,000	$244,000,000	$2,302,000,000	$1,176,000,000

Condensed_Consolidated_Stateme3

Condensed Consolidated Statement of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrealized gains (losses) on marketable securities, deferred taxes	$0	($11)	($19)	($82)
Deferred gains (losses) on cash flow hedges, deferred taxes	2	-26	1	-6
Realized (gains) losses on marketable securities, deferred taxes	0	165	58	177
Realized (gains) losses on cash flow hedges, deferred taxes	-22	22	-10	-6
Employee benefit obligations, deferred taxes	0	-34	0	-36
Currency translation adjustments, deferred taxes	$10	($5)	$3	$9

Condensed_Consolidated_Stateme4

Condensed Consolidated Statement of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net cash provided by operating activities	$12,302,000,000	$11,679,000,000
Investing Activities	'	'
Capital expenditures	-5,196,000,000	-4,593,000,000
Cash paid for intangible assets	-735,000,000	-694,000,000
Acquisitions and construction of real estate properties	-28,000,000	-1,705,000,000
Acquisitions, net of cash acquired	-477,000,000	-42,000,000
Proceeds from sales of businesses and investments	622,000,000	655,000,000
Return of capital from investees	6,000,000	146,000,000
Purchases of investments	-145,000,000	-1,177,000,000
Other	-127,000,000	83,000,000
Net cash provided by (used in) investing activities	-6,080,000,000	-7,327,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-437,000,000	395,000,000
Proceeds from borrowings	4,182,000,000	2,933,000,000
Repurchases and repayments of debt	-3,172,000,000	-2,442,000,000
Repurchases and retirements of common stock	-2,250,000,000	-1,500,000,000
Dividends paid	-1,676,000,000	-1,454,000,000
Issuances of common stock	33,000,000	35,000,000
Purchase of NBCUniversal noncontrolling common equity interest	'	-10,761,000,000
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-170,000,000	-164,000,000
Settlement of Station Venture liability	'	-602,000,000
Other	97,000,000	-140,000,000
Net cash provided by (used in) financing activities	-3,393,000,000	-13,700,000,000
Increase (decrease) in cash and cash equivalents	2,829,000,000	-9,348,000,000
Cash and cash equivalents, beginning of period	1,718,000,000	10,951,000,000
Cash and cash equivalents, end of period	4,547,000,000	1,603,000,000
NBCUniversal Media, LLC [Member]	'	'
Operating Activities	'	'
Net cash provided by operating activities	3,156,000,000	3,734,000,000
Investing Activities	'	'
Capital expenditures	-884,000,000	-807,000,000
Cash paid for intangible assets	-86,000,000	-86,000,000
Acquisitions of real estate properties	0	-1,705,000,000
Acquisitions, net of cash acquired	-118,000,000	-42,000,000
Note receivable from Comcast	0	-981,000,000
Return of capital from investees	5,000,000	131,000,000
Purchases of investments	-29,000,000	-235,000,000
Other	-145,000,000	-20,000,000
Net cash provided by (used in) investing activities	-1,257,000,000	-3,745,000,000
Financing Activities	'	'
Proceeds from (repayments of) borrowings from Comcast, net	279,000,000	0
Repurchases and repayments of debt	-904,000,000	-91,000,000
Redemption Transaction distribution	'	-3,200,000,000
Distributions to noncontrolling interests	-135,000,000	-144,000,000
Distributions to member	-1,237,000,000	-938,000,000
Settlement of Station Venture liability	'	-602,000,000
Other	-4,000,000	-65,000,000
Net cash provided by (used in) financing activities	-2,001,000,000	-5,040,000,000
Increase (decrease) in cash and cash equivalents	-102,000,000	-5,051,000,000
Cash and cash equivalents, beginning of period	967,000,000	5,921,000,000
Cash and cash equivalents, end of period	$865,000,000	$870,000,000

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]

ClassA Special Common Stock [Member]

Class B Common Stock [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Treasury Stock at Cost [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Accumulated Other Comprehensive Income (Loss) [Member]

Noncontrolling Interests [Member]

Noncontrolling Interests [Member]

Redeemable Noncontrolling Interest [Member]

Member's Capital [Member]

In Millions

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

NBCUniversal Media, LLC [Member]

Beginning balance at Dec. 31, 2012

'

$32,254

'

'

'

'

'

'

'

'

($65)

'

$419

$131

$31,900

Beginning Balance at Dec. 31, 2012

49,796

'

16,998

25

6

0

40,547

16,280

-7,517

15

'

440

'

'

'

Stock compensation plans

178

'

'

'

'

'

433

-255

'

'

'

'

'

'

'

Repurchases and retirements of common stock

-1,500

'

'

'

-1

'

-432

-1,067

'

'

'

'

'

'

'

Employee stock purchase plans

75

'

'

'

'

'

75

'

'

'

'

'

'

'

'

Compensation Plans

'

7

'

'

'

'

'

'

'

'

'

'

'

'

7

Other comprehensive income (loss)

-99

-38

-9

'

'

'

'

'

'

-99

-38

'

'

'

'

Redemption Transaction distribution

'

-3,200

'

'

'

'

'

'

'

'

'

'

'

'

-3,200

Dividends declared

-1,537

-938

'

'

'

'

'

-1,537

'

'

'

'

'

'

-938

Purchase of NBCUniversal noncontrolling common equity interest

-1,508

'

-17,006

'

'

'

-1,482

'

'

-26

'

'

'

'

'

Redeemable subsidiary preferred stock

'

'

725

'

'

'

'

'

'

'

'

'

'

'

'

Contributions from (distributions to) noncontrolling interests, net

-103

-125

-14

'

'

'

'

'

'

'

'

-103

-125

-14

'

Other

-152

-200

-24

'

'

'

-150

'

'

'

'

-2

-2

'

-198

Net income (loss)

4,984

1,309

183

'

'

'

'

4,903

'

'

'

81

95

10

1,214

Ending Balance at Sep. 30, 2013

50,134

'

853

25

5

0

38,991

18,324

-7,517

-110

'

416

'

'

'

Ending balance at Sep. 30, 2013

'

29,069

'

'

'

'

'

'

'

'

-103

'

387

127

28,785

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

189

'

'

'

'

'

580

-391

'

'

'

'

'

'

'

Repurchases and retirements of common stock

-2,250

'

'

'

'

'

-504

-1,746

'

'

'

'

'

'

'

Employee stock purchase plans

91

'

'

'

'

'

91

'

'

'

'

'

'

'

'

Other comprehensive income (loss)

-53

4

'

'

'

'

'

'

'

-53

4

'

'

'

'

Dividends declared

-1,748

-1,237

'

'

'

'

'

-1,748

'

'

'

'

'

'

-1,237

Issuance of subsidiary shares to noncontrolling interests

13

'

85

'

'

'

'

'

'

'

'

13

'

85

'

Contributions from (distributions to) noncontrolling interests, net

-101

-120

-11

'

'

'

'

'

'

'

'

-101

-120

-15

'

Other

-93

-3

-22

'

'

'

-80

'

'

'

'

-13

-1

'

-2

Net income (loss)

6,547

2,395

49

'

'

'

'

6,455

'

'

'

92

97

21

2,298

Ending Balance at Sep. 30, 2014

53,653

'

1,058

25

5

0

38,977

21,805

-7,517

3

'

355

'

'

'

Ending balance at Sep. 30, 2014

'

$30,366

'

'

'

'

'

'

'

'

($12)

'

$263

$322

$30,115

Condensed_Consolidated_Financi

Condensed Consolidated Financial Statements	9 Months Ended
	Sep. 30, 2014
Condensed Consolidated Financial Statements	'
	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, financial condition and cash flows for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.
	The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States of America (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2013 Annual Report on Form 10-K.
NBCUniversal Media, LLC [Member]	'
Condensed Consolidated Financial Statements	'
	Note 1: Condensed Consolidated Financial Statements
	Basis of Presentation
	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 of America (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2013 Annual Report on Form 10-K.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
Recent Accounting Pronouncements	'
	Note 2: Recent Accounting Pronouncements
	Discontinued Operations
	In April 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to discontinued operations. The updated accounting guidance provides a narrower definition of discontinued operations than existing GAAP. The updated accounting guidance requires that only disposals of components of an entity, or groups of components, that represent a strategic shift that has or will have a material effect on the reporting entity’s operations be reported in the financial statements as discontinued operations. The updated accounting guidance also provides guidance on the financial statement presentations and disclosures of discontinued operations. The updated accounting guidance will be effective prospectively for us on January 1, 2015, with early adoption permitted in 2014.
	Revenue Recognition
	In May 2014, the 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. The updated accounting guidance will be effective for us on January 1, 2017, and early adoption is not permitted. The updated accounting guidance allows for either a full retrospective adoption or modified retrospective 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.
NBCUniversal Media, LLC [Member]	'
Recent Accounting Pronouncements	'
	Note 2: Recent Accounting Pronouncements
	Discontinued Operations
	In April 2014, the Financial Accounting Standards Board (“FASB”) updated the accounting guidance related to discontinued operations. The updated accounting guidance provides a narrower definition of discontinued operations than existing GAAP. The updated accounting guidance requires that only disposals of components of an entity, or groups of components, that represent a strategic shift that has or will have a material effect on the reporting entity’s operations be reported in the financial statements as discontinued operations. The updated accounting guidance also provides guidance on the financial statement presentations and disclosures of discontinued operations. The updated accounting guidance will be effective prospectively for us on January 1, 2015, with early adoption permitted in 2014.
	Revenue Recognition
	In May 2014, the 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. The updated accounting guidance will be effective for us on January 1, 2017, and early adoption is not permitted. The updated accounting guidance allows for either a full retrospective adoption or modified retrospective 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.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share	'
Earnings Per Share	'
	Note 3: Earnings Per Share
	Computation of Diluted EPS
			Three Months Ended September 30
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation
		shareholders	$	2,592	2,580	$	1	$	1,732	2,622	$	0.66
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			36					36
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	2,592	2,616	$	0.99	$	1,732	2,658	$	0.65
			Nine Months Ended September 30
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation
		shareholders	$	6,455	2,592	$	2.49	$	4,903	2,629	$	1.86
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			37					39
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	6,455	2,629	$	2.46	$	4,903	2,668	$	1.84
	Our potentially dilutive securities include potential common shares related to our stock options and our restricted share units (“RSUs”). Diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities by using the treasury stock method.
	For the three and nine months ended September 30, 2014, diluted EPS excluded 17 million and 13 million, respectively, of potential common shares related to our share-based compensation plans, because the inclusion of the potential common shares would have had an antidilutive effect. For the three and nine months ended September 30, 2013, diluted EPS excluded 18 million and 13 million, respectively, of potential common shares.

Significant_Transactions

Significant Transactions	9 Months Ended
	Sep. 30, 2014
Significant Transactions	'
	Note 4: Significant Transactions
	Time Warner Cable Merger
	On February 12, 2014, we entered into an agreement and plan of merger (the “merger agreement”) with Time Warner Cable Inc. (“Time Warner Cable”) whereby Time Warner Cable will become our wholly owned subsidiary (the “Time Warner Cable merger”). Time Warner Cable stockholders will receive, in exchange for each share of Time Warner Cable common stock owned immediately prior to the Time Warner Cable merger, 2.875 shares of our Class A common stock. We estimate that at the time of closing, Time Warner Cable stockholders will own approximately 24% of the outstanding shares of our common stock. Because the exchange ratio was fixed at the time of the merger agreement and the market value of our Class A common stock will continue to fluctuate, the number of shares of Class A common stock to be issued and the total value of the consideration exchanged will not be determinable until the closing date. The Time Warner Cable merger was approved by Comcast shareholders on October 8, 2014 and by Time Warner Cable stockholders on October 9, 2014. The Time Warner Cable merger remains subject to regulatory review and other customary conditions and is expected to close in early 2015.
	Divestiture Transactions
	The terms of the merger agreement contemplate that we are prepared to divest systems serving up to approximately 3 million video customers of our company following the Time Warner Cable merger in order to obtain applicable regulatory approvals. As a result of this commitment, on April 25, 2014, we entered into a transactions agreement with Charter Communications, Inc. (“Charter”) that, if consummated, would satisfy the divestiture undertaking. Under the transactions agreement, following the close of the Time Warner Cable merger and subject to various conditions, we would divest cable systems resulting in a net disposition of approximately 3.9 million video customers through three transactions: (1) a spin-off of cable systems serving approximately 2.5 million of our video customers (the “spin-off transaction”) into a newly formed public entity (“SpinCo”), (2) an exchange of cable systems serving approximately 1.5 million Time Warner Cable video customers for cable systems serving approximately 1.7 million Charter video customers, and (3) a sale to Charter of cable systems serving approximately 1.5 million Time Warner Cable video customers for cash (collectively, the “divestiture transactions”).
	In connection with the spin-off transaction and prior to the spin-off, it is expected that SpinCo will incur new debt to fund a cash distribution to us and to issue notes to us, which the notes will enable us to then retire a portion of our debt. In the spin-off transaction, we will distribute common stock of SpinCo pro rata to the holders of all of our outstanding common stock, including the former Time Warner Cable stockholders who continue to hold shares through the record date of the spin-off transaction. After the spin-off transaction, a newly formed, wholly owned indirect subsidiary of Charter will merge with and into Charter with the effect that all shares of Charter will be converted into shares of a new holding company, which will survive as the publicly traded parent company of Charter (“New Charter”). New Charter will then acquire an interest in SpinCo by issuing New Charter stock in exchange for a portion of the outstanding SpinCo stock, following which it is expected that Comcast shareholders will own approximately 67% of SpinCo and New Charter will own approximately 33% of SpinCo. In addition, it is expected that Comcast shareholders will own approximately 10% of New Charter, though the actual percentage of New Charter that will be owned by Comcast shareholders will depend on a number of factors, some of which will not be known until the completion of the divestiture transactions. Following the close of the divestiture transactions, we will no longer have any ownership interest in SpinCo.
	The close of the divestiture transactions is subject to the completion of the Time Warner Cable merger, Charter stockholder approval, completion of the SpinCo financing transactions, regulatory approvals and other customary conditions. The Time Warner Cable merger and the divestiture transactions are subject to separate conditions, and the Time Warner Cable merger can be completed regardless of whether the divestiture transactions are ultimately completed.

Related_Party_Transactions

Related Party Transactions (NBCUniversal Media, LLC [Member])	9 Months Ended
	Sep. 30, 2014
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 under the revolving credit agreement, including accrued interest, are presented under the caption “note payable to Comcast” in our condensed consolidated balance sheet. The revolving credit 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 September 30, 2014, 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 September 30, 2014, the carrying value of the liability associated with this contractual obligation was $383 million.
	The following tables present transactions with Comcast and its consolidated subsidiaries that are included in our condensed consolidated financial statements.
	Condensed Consolidated Balance Sheet
			September 30,		December 31,
	(in millions)		2014			2013
	Transactions with Comcast and Consolidated Subsidiaries
		Receivables, net	$	241	$	228
		Accounts payable and accrued expenses related to trade creditors	$	35	$	56
		Accrued expenses and other current liabilities	$	34	$	37
		Note payable to Comcast	$	1,078	$	799
		Other noncurrent liabilities	$	383	$	383
	Condensed Consolidated Statement of Income
				Three Months Ended				Nine Months Ended
			30-Sep				30-Sep
	(in millions)			2014		2013		2014		2013
	Transactions with Comcast and Consolidated Subsidiaries
		Revenue	$	316	$	299	$	989	$	953
		Operating costs and expenses	$	-32	$	-29	$	-96	$	-126
		Other income (expense)	$	-10	$	-	$	-32	$	-
	Distributions to NBCUniversal Holdings
	In addition to the transactions above, we make distributions to NBCUniversal Holdings on a periodic basis to enable its owners to meet their obligations to pay taxes on taxable income generated by our businesses. We also make quarterly distributions to NBCUniversal Holdings to enable it to make its required quarterly payments to NBCUniversal Enterprise, Inc. (“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	9 Months Ended
	Sep. 30, 2014
Film And Television Costs Disclosure [Text Block]	'
	Note 5: Film and Television Costs
				September 30,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,313	$	1,630
		Completed, not released		193		70
		In production and in development		1,143		658
				2,649		2,358
	Television Costs:
		Released, less amortization		1,187		1,155
		In production and in development		445		370
				1,632		1,525
	Programming rights, less amortization			2,271		2,039
				6,552		5,922
	Less: Current portion of programming rights			992		928
	Film and television costs		$	5,560	$	4,994
NBCUniversal Media, LLC [Member]	'
Film And Television Costs Disclosure [Text Block]	'
	Note 4: Film and Television Costs
				September 30,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,313	$	1,630
		Completed, not released		193		70
		In production and in development		1,143		658
				2,649		2,358
	Television Costs:
		Released, less amortization		1,187		1,155
		In production and in development		445		370
				1,632		1,525
	Programming rights, less amortization			2,247		2,003
				6,528		5,886
	Less: Current portion of programming rights			976		903
	Film and television costs		$	5,552	$	4,983

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Investments	'
	Note 6: Investments
				September 30,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	588	$	4,345
	Equity Method:
		The Weather Channel		333		333
		Hulu		188		187
		Other		503		469
				1,024		989
	Cost Method:
		AirTouch		1,564		1,553
		Other		484		456
				2,048		2,009
	Total investments			3,660		7,343
	Less: Current investments			531		3,573
	Noncurrent investments		$	3,129	$	3,770
	Investment Income (Loss), Net
			Three Months Ended				Nine Months Ended
			30-Sep				30-Sep
	(in millions)		2014		2013		2014		2013
	Gains on sales and exchanges of investments, net		$	3	$	445	$	176	$	483
	Investment impairment losses			-6		-12		-30		-25
	Unrealized gains (losses) on securities underlying prepaid
		forward sale agreements		15		345		-13		1,197
	Mark to market adjustments on derivative component of prepaid
		forward sale agreements and indexed debt instruments		-13		-348		19		-1,189
	Interest and dividend income			29		28		85		84
	Other, net			-7		6		17		-1
	Investment income (loss), net		$	21	$	464	$	254	$	549
	Fair Value Method
	As of September 30, 2014, the majority of our fair value method investments were equity securities held as collateral that were related to our obligations under prepaid forward sale agreements.
	Prepaid Forward Sale Agreements
			September 30,		December 31,
	(in millions)		2014		2013
	Assets:
		Fair value equity securities held as collateral	$	444	$	3,959
	Liabilities:
		Obligations under prepaid forward sale agreements	$	117	$	811
		Derivative component of prepaid forward sale agreements		277		2,800
	Total liabilities		$	394	$	3,611
	During the nine months ended September 30, 2014, we settled $3.2 billion of obligations under certain of our prepaid forward sale agreements by delivering equity securities. As of September 30, 2014, the carrying values of our remaining prepaid forward sale obligations approximated their fair values. 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.
	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 September 30, 2014, the estimated fair values of the AirTouch preferred stock and the associated liability related to the redeemable preferred shares issued by one of our consolidated subsidiaries were each $1.7 billion. The estimated fair values are based on Level 2 inputs that useusing 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
				September 30,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	16	$	11
	Equity Method:
		The Weather Channel		333		333
		Hulu		188		187
		Other		347		332
				868		852
	Cost Method			28		21
	Total investments			912		884
	Less: Current investments			5		-
	Noncurrent Investments		$	907	$	884

LongTerm_Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2014
Long-Term Debt	'
	Note 7: Long-Term Debt
	As of September 30, 2014, our debt had a carrying value of $48.4 billion and an estimated fair value of $54.4 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 Borrowings
	In February 2014, we issued $1.2 billion aggregate principal amount of 3.60% senior notes due 2024 and $1 billion aggregate principal amount of 4.75% senior notes due 2044. The proceeds from this offering were used for working capital and general corporate purposes, including the repayment of a portion of our outstanding commercial paper and $900 million aggregate principal amount of our 2.10% senior notes due April 2014 at maturity.
	In August 2014, we issued $1 billion aggregate principal amount of 3.375% senior notes due 2025 and $1 billion aggregate principal amount of 4.20% senior notes due 2034. The proceeds from this offering were used for working capital and general corporate purposes, which may, in the future, include the repayment of certain of our senior notes.
	Debt Repayments
	In January 2014, we repaid at maturity $1 billion aggregate principal amount of 5.30% senior notes due 2014. In February 2014, we repaid $1.25 billion of borrowings outstanding under NBCUniversal Enterprise Inc.’s (“NBCUniversal Enterprise”) revolving credit facility with the proceeds from $990 million of borrowings under its new commercial paper program and cash on hand.
	Revolving Credit Facilities
	As of September 30, 2014, amounts available under our consolidated revolving credit facilities, net of amounts outstanding under our commercial paper programs and outstanding letters of credit, totaled $6.4 billion, which included $440 million available under NBCUniversal Enterprise’s revolving credit facility.
	Commercial Paper Programs
	In February 2014, NBCUniversal Enterprise entered into a commercial paper program. The maximum borrowing capacity under this commercial paper program is $1.35 billion, and it is supported by NBCUniversal Enterprise’s existing $1.35 billion revolving credit facility due March 2018. The commercial paper program is fully and unconditionally guaranteed by us and our 100% owned cable holding company subsidiaries, Comcast Cable Communications, LLC (“CCCL Parent”), Comcast MO Group, Inc. (“Comcast MO Group”), Comcast Cable Holdings, LLC (“CCH”) and Comcast MO of Delaware, LLC (“Comcast MO of Delaware”) (collectively, the “cable guarantors”). As of September 30, 2014, NBCUniversal Enterprise had $910 million face amount of commercial paper outstanding.
NBCUniversal Media, LLC [Member]	'
Long-Term Debt	'
	Note 6: Long-Term Debt
	As of September 30, 2014, our debt, excluding the note payable to Comcast, had a carrying value of $10.3 billion and an estimated fair value of $11.3 billion. The estimated fair value of our publicly traded debt is based primarily 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 2014, we repaid $900 million aggregate principal amount of 2.10% senior notes due April 2014 at maturity.
	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 September 30, 2014, we guaranteed $32.6 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 September 30, 2014.
	We do not, however, guarantee the obligations of NBCUniversal Enterprise with respect to its $4 billion aggregate principal amount of senior notes, $1.35 billion 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	9 Months Ended
	Sep. 30, 2014
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 by 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 by using pricing models that use significant inputs that are primarily unobservable, discounted cash flow methodologies or similar techniques, as well as financial 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
			30-Sep-14								31-Dec-13
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities (see Note 6)		$	450	$	-	$	-	$	450	$	3,956
	Available-for-sale securities			6		121		10		137		389
	Interest rate swap agreements			-		81		-		81		110
	Other			-		67		1		68		81
	Total		$	456	$	269	$	11	$	736	$	4,536
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments (see Note 6)	$	-	$	288	$	-	$	288	$	2,816
	Contractual obligation			-		-		818		818		747
	Contingent consideration			-		-		653		653		684
	Other			-		8		-		8		16
	Total		$	-	$	296	$	1,471	$	1,767	$	4,263
	Contractual Obligation and Contingent Consideration
	The estimated fair values of the contractual obligation and contingent consideration in the table above are primarily based on certain expected future discounted cash flows, the determination of which involves the use of significant unobservable inputs. The most significant unobservable inputs we use include our estimates of the future revenue we expect to generate from certain NBCUniversal businesses, which are related to our contractual obligation, and future net tax benefits that will affect payments to 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 obligation and contingent consideration are sensitive to the assumptions related to future revenue and tax benefits, respectively, as well as to current interest rates, and therefore, the adjustments are recorded to other income (expense), net in our condensed consolidated statement of income.
	Changes in Contractual Obligation and Contingent Consideration
	(in millions)		Contractual Obligation		Contingent Consideration
	Balance, January 1, 2014	$	747	$	684
	Fair value adjustments		120		23
	Payments		-49		-54
	Balance, September 30, 2014	$	818	$	653
	Fair Value of Redeemable Subsidiary Preferred Stock Financial Instrument
	As of September 30, 2014, the fair value of the NBCUniversal Enterprise redeemable subsidiary preferred stock was $752 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 liability associated with our contractual obligation. The estimated fair value of the contractual obligation is primarily based on certain expected future discounted cash flows, the determination of which involves the use of significant unobservable inputs. As the inputs used are not quoted market prices or observable inputs, we classify the contractual obligation as a Level 3 financial instrument.
	The most significant unobservable inputs we use include our estimates of the future revenue we expect to generate from certain of our businesses. The discount rates used in the measurement of fair value were between 12% and 13% and are based on the underlying risk associated with our estimate of future revenue and the terms of the respective contract. The fair value adjustments to the contractual obligation 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 Obligation
	(in millions)		Contractual Obligation
	Balance, January 1, 2014	$	747
	Fair value adjustments		120
	Payments		-49
	Balance, September 30, 2014	$	818

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Sep. 30, 2014
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 2014, we granted 16.4 million stock options and 5.4 million RSUs related to our annual management awards. The weighted-average fair values associated with these grants were $11.09 per stock option and $46.57 per RSU.
	Recognized Share-Based Compensation Expense
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)	2014		2013			2014		2013
	Stock options	$	38	$	34		$	121	$	102
	Restricted share units		55		44			171		130
	Employee stock purchase plans		5		4			18		15
	Total	$	98	$	82		$	310	$	247
	As of September 30, 2014, we had unrecognized pretax compensation expense of $356 million and $489 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 Comcast’s employee stock purchase plans, employees are able to purchase shares of its Class A common stock at a discount through payroll deductions. Certain of our employees participate in these plans and the expense associated with their participation is settled in cash with Comcast.
	Recognized Share-Based Compensation Expense
		Three Months Ended				Nine Months Ended
		30-Sep				30-Sep
	(in millions)	2014		2013		2014		2013
	Stock options	$	4	$	4	$	13	$	11
	Restricted share units		15		11		52		30
	Employee stock purchase plans		1		1		5		4
	Total	$	20	$	16	$	70	$	45

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes	'
	Note 10: Income Taxes
	During the three months ended September 30, 2014, we reduced our accruals for uncertain tax positions and the related accrued interest on these tax positions. The reduction resulted in a decrease of $724 million in income tax expense, which excludes the benefits of uncertain tax positions for which we have been indemnified by GE. The table below presents a reconciliation of our uncertain tax positions from January 1, 2014 to September 30, 2014.
	(in millions)
	Balance, January 1, 2014	$	1,701
	Additions based on tax positions related to the current year		54
	Additions based on tax positions related to prior years		31
	Reductions for tax positions of prior years		-168
	Reductions due to expiration of statutes of limitations		-436
	Settlements with taxing authorities		-15
	Balance, September 30, 2014	$	1,167
	As of September 30, 2014 and December 31, 2013, our accrued interest associated with tax positions was $460 million and $780 million, respectively.

Supplemental_Financial_Informa

Supplemental Financial Information	9 Months Ended
	Sep. 30, 2014
Supplemental Financial Information	'
	Note 11: Supplemental Financial Information
	Receivables
		September 30,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	6,679	$	6,972
	Less: Allowance for returns and customer incentives		284		375
	Less: Allowance for doubtful accounts		223		221
	Receivables, net	$	6,172	$	6,376
	Accumulated Other Comprehensive Income (Loss)
			September 30,		September 30,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	3	$	18
	Deferred gains (losses) on cash flow hedges			-29		-47
	Unrecognized gains (losses) on employee benefit obligations			70		-50
	Cumulative translation adjustments			-41		-31
	Accumulated other comprehensive income (loss), net of deferred taxes		$	3	$	-110
	Net Cash Provided by Operating Activities
					Nine Months Ended
					30-Sep
	(in millions)				2014		2013
	Net income				$	6,596	$	5,167
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				5,929		5,873
		Share-based compensation				386		312
		Noncash interest expense (income), net				132		122
		Equity in net (income) losses of investees, net				-87		96
		Cash received from investees				71		89
		Net (gain) loss on investment activity and other				-24		-239
		Deferred income taxes				358		-52
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				89		145
		Film and television costs, net(a)				-471		408
		Accounts payable and accrued expenses related to trade creditors				119		-108
		Other operating assets and liabilities				-796		-134
	Net cash provided by operating activities				$	12,302	$	11,679
	Comprised of additions to our film and television cost assets of $7,198 million and $5,590 million, net of film and television cost amortization of $6,727 million and $5,998 million in 2014 and 2013, respectively.
	Cash Payments for Interest and Income Taxes
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)		2014		2013			2014		2013
	Interest	$	656	$	636		$	1,820	$	1,768
	Income taxes	$	974	$	958		$	2,878	$	3,180
	Noncash Investing and Financing Activities
	During the nine months ended September 30, 2014:
	• we acquired $847 million of property and equipment and intangible assets that were accrued but unpaid
	• we recorded a liability of $580 million for a quarterly cash dividend of $0.225 per common share paid in October 2014
	• we used $3.2 billion of equity securities to settle our obligations under certain prepaid forward sale agreements
NBCUniversal Media, LLC [Member]	'
Supplemental Financial Information	'
	Note 9: Supplemental Financial Information
	Receivables
		September 30,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	5,134	$	5,348
	Less: Allowance for returns and customer incentives		281		372
	Less: Allowance for doubtful accounts		69		65
	Receivables, net	$	4,784	$	4,911
	Accumulated Other Comprehensive Income (Loss)
			September 30,		September 30,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	3	$	-
	Deferred gains (losses) on cash flow hedges			4		-5
	Unrecognized gains (losses) on employee benefit obligations			45		-51
	Cumulative translation adjustments			-64		-47
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-12	$	-103
	Net Cash Provided by Operating Activities
					Nine Months Ended
					30-Sep
	(in millions)				2014		2013
	Net income				$	2,416	$	1,319
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				1,106		1,045
		Share-based compensation				-		7
		Equity in net (income) losses of investees, net				-49		105
		Cash received from investees				50		73
		Net (gain) loss on investment activity and other				83		347
		Deferred income taxes				52		-6
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				7		142
		Film and television costs, net(a)				-483		368
		Accounts payable and accrued expenses related to trade creditors				-183		-262
		Other operating assets and liabilities				157		596
	Net cash provided by operating activities				$	3,156	$	3,734
	Comprised of additions to our film and television cost assets of $7,188 million and $5,577 million, net of film and television cost amortization of $6,705 million and $5,945 million in 2014 and 2013, respectively.
	Cash Payments for Interest and Income Taxes
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)		2014		2013			2014		2013
	Interest	$	38	$	38		$	294	$	262
	Income taxes	$	31	$	59		$	141	$	161
	Noncash Investing and Financing Activities
	During the nine months ended September 30, 2014:
	• we acquired $194 million of property and equipment and intangible assets that were accrued but unpaid

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies	'
	Note 12: Commitments and Contingencies
	Contingencies
	Antitrust Cases
	We are defendants in two purported class actions originally filed in December 2003 in the United States District Courts for the District of Massachusetts and the Eastern District of Pennsylvania. The potential class in the Massachusetts case, which has been transferred to the Eastern District of Pennsylvania, is our customer base in the “Boston Cluster” area, and the potential class in the Pennsylvania case is our customer base in the “Philadelphia and Chicago Clusters,” as those terms are defined in the complaints. In each case, the plaintiffs allege that certain customer exchange transactions with other cable providers resulted in unlawful horizontal market restraints in those areas and seek damages under antitrust statutes, including treble damages.
	Classes of Chicago Cluster and Philadelphia Cluster customers were certified in October 2007 and January 2010, respectively. We appealed the class certification in the Philadelphia Cluster case to the Third Circuit Court of Appeals, which affirmed the class certification in August 2011. In June 2012, the U.S. Supreme Court granted our petition to review the Third Circuit Court of Appeals’ ruling and in March 2013, the Supreme Court ruled that the class had been improperly certified and reversed the judgment of the Third Circuit. The matter has been returned to the District Court for action consistent with the Supreme Court’s opinion. In August 2013, the plaintiffs in the Philadelphia Cluster case moved to certify a new, smaller class, which we opposed in January 2014. The parties have been discussing possible resolution of the Philadelphia Cluster case. Accordingly, in February 2014, the plaintiff filed an unopposed motion to stay the case, which the District Court granted. In April 2014, the District Court granted our unopposed motion to de-certify the Chicago Cluster class and the plaintiffs’ unopposed motion to amend the Pennsylvania case so as to dismiss claims relating to the Chicago Cluster. In April 2014, lead counsel for the Boston Cluster cases withdrew, and in June 2014, new counsel requested the Boston Cluster cases be transferred to the federal court in Boston, which we have opposed.
	In addition, we are the defendant in 22 purported class actions filed in federal district courts throughout the country. All of these actions have been consolidated by the Judicial Panel on Multidistrict Litigation in the United States District Court for the Eastern District of Pennsylvania for pre-trial proceedings. In a consolidated complaint filed in November 2009 on behalf of all plaintiffs in the multidistrict litigation, the plaintiffs allege that we improperly “tie” the rental of set-top boxes to the provision of premium cable services in violation of Section 1 of the Sherman Antitrust Act, various state antitrust laws and unfair/deceptive trade practices acts in California, Illinois and Alabama. The plaintiffs also allege a claim for unjust enrichment and seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California, Alabama, Illinois, Pennsylvania and Washington. In January 2010, we moved to compel arbitration of the plaintiffs’ claims for unjust enrichment and violations of the unfair/deceptive trade practices acts of Illinois and Alabama. In September 2010, the plaintiffs filed an amended complaint alleging violations of additional state antitrust laws and unfair/deceptive trade practices acts on behalf of new subclasses in Connecticut, Florida, Minnesota, Missouri, New Jersey, New Mexico and West Virginia. In the amended complaint, plaintiffs omitted their unjust enrichment claim, as well as their state law claims on behalf of the Alabama, Illinois and Pennsylvania subclasses. In June 2011, the plaintiffs filed another amended complaint alleging only violations of Section 1 of the Sherman Antitrust Act, antitrust law in Washington and unfair/deceptive trade practices acts in California and Washington. The plaintiffs seek relief on behalf of a nationwide class of our premium cable customers and on behalf of subclasses consisting of premium cable customers from California and Washington. In July 2011, we moved to compel arbitration of most of the plaintiffs’ claims and to stay the remaining claims pending arbitration. The West Virginia Attorney General also filed a complaint in West Virginia state court in July 2009 alleging that we improperly “tie” the rental of set-top boxes to the provision of digital cable services in violation of the West Virginia Antitrust Act and the West Virginia Consumer Credit and Protection Act. The Attorney General also alleges a claim for unjust enrichment/restitution. We removed the case to the United States District Court for West Virginia, and it was subsequently transferred to the United States District Court for the Eastern District of Pennsylvania and consolidated with the multidistrict litigation described above. Although a comprehensive settlement agreement for all 23 cases that had been submitted to the District Court for preliminary approval in June 2013was withdrawn in October 2014, we do not expect these cases to have a material effect on our results of operations, cash flows or financial position.
	We believe the claims in each of the pending actions described above in this item are without merit, except as otherwise set forth above, and intend to defend the actions vigorously. We cannot predict the outcome of any of the actions described above, including a range of possible loss, or how the final resolution of any such actions would impact our results of operations or cash flows for any one period or our financial position. In addition, as any action nears a trial, there is an increased possibility that the action may be settled by the parties. Nevertheless, the final disposition of any of the above actions is not expected to have a material adverse effect on our consolidated financial position, but could possibly be material to our consolidated results of operations or cash flows for any one period.
	Other
	We are a defendant in several unrelated lawsuits claiming infringement of various patents relating to various aspects of our businesses. In certain of these cases other industry participants are also defendants, and also in certain of these cases we expect that any potential liability would be in part or in whole the responsibility of our equipment and technology vendors under applicable contractual indemnification provisions. We are also subject to other legal proceedings and claims that arise in the ordinary course of our business. While the amount of ultimate liability with respect to such actions is not expected to materially affect our results of operations, cash flows or financial position, any litigation resulting from any such legal proceedings or claims could be time consuming and injure our reputation.

Financial_Data_by_Business_Seg

Financial Data by Business Segment	9 Months Ended
	Sep. 30, 2014
Financial Data by Business Segment	'
	Note 13: 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 to residential customers under the XFINITY brand, and we also provide similar services to businesses and sell advertising.
	• Cable Networks: Consists primarily of our national cable networks, our regional sports networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, and our broadcast television production operations.
	• Filmed Entertainment: Consists primarily of the studio operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide.
	• Theme Parks: Consists primarily of our Universal theme parks in Orlando and Hollywood.
	In evaluating the profitability of our operating segments, the components of net income (loss) below operating income (loss) before depreciation and amortization are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.
			Three Months Ended September 30, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	11,041	$	4,464	$	1,561	$	2,903	$	1,644
	NBCUniversal
		Cable Networks(b)		2,255		868		189		679		11
		Broadcast Television		1,770		142		24		118		15
		Filmed Entertainment(b)		1,186		151		6		145		4
		Theme Parks		786		402		68		334		184
		Headquarters and Other(c)		4		-142		84		-226		81
		Eliminations(d)		-80		-5		-		-5		-
	NBCUniversal			5,921		1,416		371		1,045		295
	Corporate and Other			174		-197		27		-224		11
	Eliminations(d)			-345		21		-		21		-
	Comcast Consolidated		$	16,791	$	5,704	$	1,959	$	3,745	$	1,950
			Three Months Ended September 30, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,491	$	4,246	$	1,549	$	2,697	$	1,432
	NBCUniversal
		Cable Networks(b)		2,239		853		183		670		19
		Broadcast Television		1,644		34		23		11		21
		Filmed Entertainment(b)		1,400		189		4		185		1
		Theme Parks		661		343		73		270		142
		Headquarters and Other(c)		7		-167		69		-236		101
		Eliminations(d)		-100		-2		-		-2		-
	NBCUniversal			5,851		1,250		352		898		284
	Corporate and Other			133		-178		16		-194		10
	Eliminations(d)			-324		12		-1		13		-
	Comcast Consolidated		$	16,151	$	5,330	$	1,916	$	3,414	$	1,726
			Nine Months Ended September 30, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	32,827	$	13,428	$	4,749	$	8,679	$	4,282
	NBCUniversal
		Cable Networks(b)		7,236		2,677		558		2,119		30
		Broadcast Television		6,207		504		78		426		52
		Filmed Entertainment(b)		3,713		634		16		618		8
		Theme Parks		1,888		816		210		606		486
		Headquarters and Other(c)		10		-464		244		-708		308
		Eliminations(d)		-241		-6		-		-6		-
	NBCUniversal			18,813		4,161		1,106		3,055		884
	Corporate and Other			520		-532		74		-606		30
	Eliminations(d)			-1,117		-11		-		-11		-
	Comcast Consolidated		$	51,043	$	17,046	$	5,929	$	11,117	$	5,196
			Nine Months Ended September 30, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	31,175	$	12,800	$	4,780	$	8,020	$	3,766
	NBCUniversal
		Cable Networks(b)		6,877		2,572		549		2,023		67
		Broadcast Television		4,893		205		74		131		38
		Filmed Entertainment(b)		4,004		291		11		280		4
		Theme Parks		1,669		747		218		529		427
		Headquarters and Other(c)		25		-416		193		-609		271
		Eliminations(d)		-282		-5		-		-5		-
	NBCUniversal			17,186		3,394		1,045		2,349		807
	Corporate and Other			431		-380		48		-428		20
	Eliminations(d)			-1,061		-25		-		-25		-
Comcast Consolidated		$	47,731	$	15,789	$	5,873	$	9,916	$	4,593
For the three and nine months ended September 30, 2014 and 2013, Cable Communications segment revenue was derived from the following sources:
		Three Months Ended				Nine Months Ended
		30-Sep				30-Sep
		2014		2013		2014		2013
Residential:
	Video	46.9	%	48.9	%	47.5	%	49.4	%
	High-speed Internet	25.7	%	24.7	%	25.6	%	24.6	%
	Voice	8.3	%	8.8	%	8.4	%	8.8	%
Business services		9.2	%	8	%	8.8	%	7.6	%
Advertising		5.5	%	5.2	%	5.3	%	5.1	%
Other		4.4	%	4.4	%	4.4	%	4.5	%
Total		100	%	100	%	100	%	100	%
Subscription revenue received from customers who purchase bundled services at a discounted rate is allocated proportionally to each service based on the individual service’s price on a stand-alone basis.
For both the three and nine months ended September 30, 2014, 2.8% of Cable Communications segment revenue was derived from franchise and other regulatory fees. For both the three and nine months ended September 30, 2013, 2.9% of Cable Communications segment revenue was derived from franchise and other regulatory fees.
Beginning in 2014, Fandango, our movie ticketing and entertainment business that was previously presented in our Cable Networks segment, is now presented in the Filmed Entertainment segment to reflect the change in our management reporting presentation. Due to immateriality, prior period amounts have not been adjusted. The change in presentation resulted in the reclassification of $195 million of goodwill from our Cable Networks segment to our Filmed Entertainment segment.
NBCUniversal Headquarters and Other activities includes costs associated with overhead, allocations, personnel costs and headquarter initiatives.
Included in Eliminations are transactions that our segments enter into with one another. The most common types of transactions are the following:
our Cable Networks and Broadcast Television segments generate revenue by selling programming to our Cable Communications segment, which represents a substantial majority of the revenue elimination amount
our Cable Communications segment generates revenue by selling advertising and by selling the use of satellite feeds to our Cable Networks segment
our Filmed Entertainment and Broadcast Television segments generate revenue by licensing content to our Cable Networks segment
our Cable Communications segment receives incentives offered by our Cable Networks segment in connection with its distribution of the Cable Networks’ content that are recorded as a reduction to programming expenses
No single customer accounted for a significant amount of revenue in any period.
We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses on the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash depreciation and amortization expense that results from the capital-intensive nature of certain of our businesses and from intangible assets recognized in business combinations. Additionally, it is unaffected by our capital structure or investment activities. We use this measure to evaluate our consolidated operating performance and the operating performance of our operating segments and to allocate resources and capital to our operating segments. It is also a significant performance measure in our annual incentive compensation programs. We believe that this measure is useful to investors because it is one of the bases for comparing our operating performance with that of other companies in our industries, although our measure may not be directly comparable to similar measures used by other companies. This measure should not be considered a substitute for operating income (loss), net income (loss) attributable to Comcast Corporation, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.
NBCUniversal Media, LLC [Member]	'
Financial Data by Business Segment	'
	Note 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 networks, our international cable networks and our cable television production operations.
	• Broadcast Television: Consists primarily of the NBC and Telemundo broadcast networks, our NBC and Telemundo owned local broadcast television stations, and our broadcast television production operations.
	• Filmed Entertainment: Consists primarily of the studio operations of Universal Pictures, which produces, acquires, markets and distributes filmed entertainment worldwide.
	• Theme Parks: Consists primarily of our Universal theme parks in Orlando and Hollywood.
	In evaluating the profitability of our operating segments, the components of net income (loss) below operating income (loss) before depreciation and amortization are not separately evaluated by our management. Our financial data by business segment is presented in the tables below.
			Three Months Ended September 30, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,255	$	868	$	189	$	679	$	11
		Broadcast Television		1,770		142		24		118		15
		Filmed Entertainment(a)		1,186		151		6		145		4
		Theme Parks		786		402		68		334		184
		Headquarters and Other(b)		4		-142		84		-226		81
		Eliminations(c)		-80		-5		-		-5		-
	Total		$	5,921	$	1,416	$	371	$	1,045	$	295
			Three Months Ended September 30, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,239	$	853	$	183	$	670	$	19
		Broadcast Television		1,644		34		23		11		21
		Filmed Entertainment(a)		1,400		189		4		185		1
		Theme Parks		661		343		73		270		142
		Headquarters and Other(b)		7		-167		69		-236		101
		Eliminations(c)		-100		-2		-		-2		-
	Total		$	5,851	$	1,250	$	352	$	898	$	284
			Nine Months Ended September 30, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks(a)		$	7,236	$	2,677	$	558	$	2,119	$	30
	Broadcast Television			6,207		504		78		426		52
	Filmed Entertainment(a)			3,713		634		16		618		8
	Theme Parks			1,888		816		210		606		486
	Headquarters and Other(b)			10		-464		244		-708		308
	Eliminations(c)			-241		-6		-		-6		-
	Total		$	18,813	$	4,161	$	1,106	$	3,055	$	884
			Nine Months Ended September 30, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks(a)		$	6,877	$	2,572	$	549	$	2,023	$	67
	Broadcast Television			4,893		205		74		131		38
	Filmed Entertainment(a)			4,004		291		11		280		4
	Theme Parks			1,669		747		218		529		427
	Headquarters and Other(b)			25		-416		193		-609		271
	Eliminations(c)			-282		-5		-		-5		-
	Total		$	17,186	$	3,394	$	1,045	$	2,349	$	807
	Beginning in 2014, Fandango, our movie ticketing and entertainment business that was previously presented in our Cable Networks segment, is now presented in the Filmed Entertainment segment to reflect the change in our current management reporting presentation. Due to immateriality, prior period amounts have not been adjusted. The change in presentation resulted in the reclassification of $195 million of goodwill from our Cable Networks segment to our Filmed Entertainment segment.
	Headquarters and Other activities include costs associated with overhead, personnel costs and headquarter initiatives.
	Included in Eliminations are transactions that our segments enter into with one another, which consist primarily of the licensing of film and television content from our Filmed Entertainment and Broadcast Television segments to our Cable Networks segment.
	No single customer accounted for a significant amount of revenue in any period.
	We use operating income (loss) before depreciation and amortization, excluding impairment charges related to fixed and intangible assets and gains or losses on the sale of assets, if any, as the measure of profit or loss for our operating segments. This measure eliminates the significant level of noncash amortization expense that results from intangible assets recognized in business combinations. Additionally, it is unaffected by our capital structure or investment activities. We use this measure to evaluate our consolidated operating performance and the operating performance of our operating segments and to allocate resources and capital to our operating segments. It is also a significant performance measure in our annual incentive compensation programs. We believe that this measure is useful to investors because it is one of the bases for comparing our operating performance with that of other companies in our industries, although our measure may not be directly comparable to similar measures used by other companies. This measure should not be considered a substitute for operating income (loss), net income (loss) attributable to NBCUniversal, net cash provided by operating activities, or other measures of performance or liquidity we have reported in accordance with GAAP.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2014
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Financial Information	'
	Note 14: Condensed Consolidating Financial Information
	Comcast Corporation (“Comcast Parent”), our cable guarantors and NBCUniversal Media, LLC (referred to as “NBCUniversal Media Parent” in the tables below) have fully and unconditionally guaranteed each other’s debt securities. Comcast MO Group, CCH and Comcast MO of Delaware are collectively referred to as the “Combined CCHMO Parents.”
	Comcast Parent and the cable guarantors also fully and unconditionally guarantee NBCUniversal Enterprise’s $4 billion aggregate principal amount of senior notes, its $1.35 billion 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
	30-Sep-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	$	-	$	-	$	-	$	-	$	196	$	4,351	$	-	$	4,547
		Investments		-		-		-		-		5		526		-		531
		Receivables, net		-		-		-		-		-		6,172		-		6,172
		Programming rights		-		-		-		-		-		992		-		992
		Other current assets		222		-		-		-		43		1,429		-		1,694
	Total current assets			222		-		-		-		244		13,470		-		13,936
	Film and television costs			-		-		-		-		-		5,560		-		5,560
	Investments			21		-		-		-		373		2,735		-		3,129
	Investments in and amounts due from subsidiaries eliminated upon consolidation			84,503		103,462		110,327		59,160		41,038		95,665		-494,155		-
	Property and equipment, net			202		-		-		-		-		30,160		-		30,362
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,323		-		27,323
	Other intangible assets, net			9		-		-		-		-		17,080		-		17,089
	Other noncurrent assets, net			1,187		148		-		-		94		2,059		-1,014		2,474
	Total assets		$	86,144	$	103,610	$	110,327	$	59,160	$	41,749	$	253,416	$	-495,169	$	159,237
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	11	$	-	$	-	$	-	$	-	$	5,669	$	-	$	5,680
		Accrued participations and residuals		-		-		-		-		-		1,444		-		1,444
		Accrued expenses and other current liabilities		1,374		283		347		21		415		3,997		-		6,437
		Current portion of long-term debt		900		-		-		679		1,008		936		-		3,523
	Total current liabilities			2,285		283		347		700		1,423		12,046		-		17,084
	Long-term debt, less current portion			28,401		131		1,827		822		9,219		4,427		-		44,827
	Deferred income taxes			-		719		-		-		59		32,319		-870		32,227
	Other noncurrent liabilities			2,160		-		-		-		945		7,427		-144		10,388
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,058		-		1,058
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		53,268		102,477		108,153		57,638		30,103		195,784		-494,155		53,268
	Total Comcast Corporation
		shareholders’ equity		53,298		102,477		108,153		57,638		30,103		195,784		-494,155		53,298
	Noncontrolling interests			-		-		-		-		-		355		-		355
	Total equity			53,298		102,477		108,153		57,638		30,103		196,139		-494,155		53,653
	Total liabilities and equity		$	86,144	$	103,610	$	110,327	$	59,160	$	41,749	$	253,416	$	-495,169	$	159,237
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	336	$	1,382	$	-	$	1,718
		Investments		-		-		-		-		-		3,573		-		3,573
		Receivables, net		-		-		-		-		-		6,376		-		6,376
		Programming rights		-		-		-		-		-		928		-		928
		Other current assets		237		-		-		-		35		1,208		-		1,480
	Total current assets			237		-		-		-		371		13,467		-		14,075
	Film and television costs			-		-		-		-		-		4,994		-		4,994
	Investments			11		-		-		-		374		3,385		-		3,770
	Investments in and amounts due from subsidiaries eliminated upon consolidation			79,956		97,429		102,673		54,724		40,644		85,164		-460,590		-
	Property and equipment, net			220		-		-		-		-		29,620		-		29,840
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,098		-		27,098
	Other intangible assets, net			11		-		-		-		-		17,318		-		17,329
	Other noncurrent assets, net			1,078		145		-		-		103		1,899		-882		2,343
	Total assets		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	8	$	-	$	-	$	-	$	-	$	5,520	$	-	$	5,528
		Accrued participations and residuals		-		-		-		-		-		1,239		-		1,239
	Accrued expenses and other current liabilities		1,371		266		180		47		323		6,678		-		8,865
	Current portion of long-term debt		2,351		-		-		-		903		26		-		3,280
Total current liabilities			3,730		266		180		47		1,226		13,463		-		18,912
Long-term debt, less current portion			25,170		132		1,827		1,505		10,236		5,697		-		44,567
Deferred income taxes			-		777		-		-		59		31,840		-741		31,935
Other noncurrent liabilities			1,919		-		-		-		931		8,675		-141		11,384
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		957		-		957
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		50,664		96,399		100,666		53,172		29,040		181,313		-460,590		50,664
Total Comcast Corporation shareholders’ equity			50,694		96,399		100,666		53,172		29,040		181,313		-460,590		50,694
Noncontrolling interests			-		-		-		-		-		364		-		364
Total equity			50,694		96,399		100,666		53,172		29,040		181,677		-460,590		51,058
Total liabilities and equity		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
Condensed Consolidating Statement of Income
For the Three Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	16,151	$	-	$	16,151
	Management fee revenue		225		-		219		137		-		-		-581		-
			225		-		219		137		-		16,151		-581		16,151
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,787		-		4,787
	Other operating and administrative		92		-		219		137		211		4,673		-581		4,751
	Advertising, marketing and promotion		-		-		-		-		-		1,283		-		1,283
	Depreciation		7		-		-		-		-		1,513		-		1,520
	Amortization		1		-		-		-		-		395		-		396
			100		-		219		137		211		12,651		-581		12,737
Operating income (loss)			125		-		-		-		-211		3,500		-		3,414
Other Income (Expense):
	Interest expense		-382		-3		-45		-30		-123		-56		-		-639
	Investment income (loss), net		1		-5		-		-		-3		471		-		464
	Equity in net income (losses) of
	investees, net		1,898		1,787		1,850		1,371		576		106		-7,718		-130
	Other income (expense), net		-		-		-		-		-		-310		-		-310
			1,517		1,779		1,805		1,341		450		211		-7,718		-615
Income (loss) before income taxes			1,642		1,779		1,805		1,341		239		3,711		-7,718		2,799
Income tax (expense) benefit			90		3		15		11		-3		-1,137		-		-1,021
Net income (loss)			1,732		1,782		1,820		1,352		236		2,574		-7,718		1,778
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-46		-		-46
Net income (loss)
	attributable to Comcast Corporation	$	1,732	$	1,782	$	1,820	$	1,352	$	236	$	2,528	$	-7,718	$	1,732
Comprehensive
	income (loss) attributable to Comcast Corporation	$	1,545	$	1,828	$	1,864	$	1,415	$	244	$	2,327	$	-7,678	$	1,545
Condensed Consolidating Statement of Income
For the Nine Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	47,731	$	-	$	47,731
	Management fee revenue		668		-		650		407		-		-		-1,725		-
			668		-		650		407		-		47,731		-1,725		47,731
Costs and Expenses:
	Programming and production		-		-		-		-		-		14,418		-		14,418
	Other operating and administrative		291		-		650		407		641		13,523		-1,725		13,787
	Advertising, marketing and promotion		-		-		-		-		-		3,737		-		3,737
	Depreciation		22		-		-		-		-		4,647		-		4,669
	Amortization		4		-		-		-		-		1,200		-		1,204
			317		-		650		407		641		37,525		-1,725		37,815
Operating income (loss)			351		-		-		-		-641		10,206		-		9,916
Other Income (Expense):
	Interest expense		-1,141		-8		-169		-96		-366		-148		-		-1,928
	Investment income (loss), net		3		-2		-		-		-2		550		-		549
	Equity in net income
	(losses) of investees, net		5,416		5,438		5,448		3,982		2,236		1,118		-23,734		-96
	Other income (expense), net		-2		-		2		-		-		-280		-		-280
			4,276		5,428		5,281		3,886		1,868		1,240		-23,734		-1,755
Income (loss) before income taxes			4,627		5,428		5,281		3,886		1,227		11,446		-23,734		8,161
Income tax (expense) benefit			276		4		58		34		-13		-3,353		-		-2,994
Net income (loss)			4,903		5,432		5,339		3,920		1,214		8,093		-23,734		5,167
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-264		-		-264
Net income (loss) attributable
	to Comcast Corporation	$	4,903	$	5,432	$	5,339	$	3,920	$	1,214	$	7,829	$	-23,734	$	4,903
Comprehensive income (loss)
	attributable to Comcast Corporation	$	4,804	$	5,471	$	5,386	$	3,983	$	1,176	$	7,741	$	-23,757	$	4,804
Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 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		$	-433	$	11	$	84	$	-88	$	-998	$	13,726	$	-	$	12,302
Investing Activities
	Net transactions with affiliates		2,349		-11		-84		88		1,761		-4,103		-		-
	Capital expenditures		-3		-		-		-		-		-5,193		-		-5,196
	Cash paid for intangible assets		-2		-		-		-		-		-733		-		-735
	Acquisitions and construction of real estate properties		-		-		-		-		-		-28		-		-28
	Acquisitions, net of cash acquired		-		-		-		-		-		-477		-		-477
	Proceeds from sales of businesses and investments		-		-		-		-		1		621		-		622
	Return of capital from investees		-		-		-		-		-		6		-		6
	Purchases of investments		-10		-		-		-		-6		-129		-		-145
	Other		-		-		-		-		4		-131		-		-127
Net cash provided by (used in) investing activities			2,334		-11		-84		88		1,760		-10,167		-		-6,080
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-1,350		-		-		-		-		913		-		-437
	Proceeds from borrowings		4,180		-		-		-		-		2		-		4,182
	Repurchases and repayments of debt		-1,000		-		-		-		-902		-1,270		-		-3,172
	Repurchases and retirements of common stock		-2,250		-		-		-		-		-		-		-2,250
	Dividends paid		-1,676		-		-		-		-		-		-		-1,676
	Issuances of common stock		33		-		-		-		-		-		-		33
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-170		-		-170
	Other		162		-		-		-		-		-65		-		97
Net cash provided by (used in) financing activities			-1,901		-		-		-		-902		-590		-		-3,393
Increase (decrease) in cash and cash equivalents			-		-		-		-		-140		2,969		-		2,829
Cash and cash equivalents, beginning of period			-		-		-		-		336		1,382		-		1,718
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	196	$	4,351	$	-	$	4,547
Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-451	$	-7	$	-3	$	-99	$	-767	$	13,006	$	-	$	11,679
Investing Activities
	Net transactions with affiliates		-116		7		2,100		337		-900		-1,428		-		-
	Capital expenditures		-3		-		-		-		-		-4,590		-		-4,593
	Cash paid for intangible assets		-1		-		-		-		-		-693		-		-694
	Acquisitions and construction of real estate properties		-		-		-		-		-		-1,705		-		-1,705
	Acquisitions, net of cash acquired		-		-		-		-		-		-42		-		-42
	Proceeds from sales of businesses and investments		-		-		-		-		-		655		-		655
	Return of capital from investees		-		-		-		-		128		18		-		146
	Purchases of investments		-8		-		-		-		-2		-1,167		-		-1,177
	Other		-		-		-		-		-20		103		-		83
Net cash provided by (used in) investing activities			-128		7		2,100		337		-794		-8,849		-		-7,327
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		400		-		-		-		-		-5		-		395
	Proceeds from borrowings		2,933		-		-		-		-		-		-		2,933
	Repurchases and repayments of debt		-		-		-2,097		-238		-88		-19		-		-2,442
	Repurchases and retirements of common stock		-1,500		-		-		-		-		-		-		-1,500
	Dividends paid		-1,454		-		-		-		-		-		-		-1,454
	Issuances of common stock		35		-		-		-		-		-		-		35
	Purchase of NBCUniversal noncontrolling common equity interest		-		-		-		-		-3,200		-7,561		-		-10,761
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-164		-		-164
	Settlement of Station Venture liability		-		-		-		-		-		-602		-		-602
	Other		165		-		-		-		-40		-265		-		-140
Net cash provided by (used in) financing activities			579		-		-2,097		-238		-3,328		-8,616		-		-13,700
Increase (decrease) in cash and cash equivalents			-		-		-		-		-4,889		-4,459		-		-9,348
Cash and cash equivalents, beginning of period			-		-		-		-		5,129		5,822		-		10,951
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	240	$	1,363	$	-	$	1,603
Condensed Consolidating Statement of Income
For the Three Months Ended September 30, 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	$	-	$	-	$	-	$	-	$	-	$	16,791	$	-	$	16,791
	Management fee revenue		237		-		237		146		-		-		-620		-
			237		-		237		146		-		16,791		-620		16,791
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,772		-		4,772
	Other operating and administrative		197		-		237		146		203		4,856		-620		5,019
	Advertising, marketing and promotion		-		-		-		-		-		1,296		-		1,296
	Depreciation		10		-		-		-		-		1,529		-		1,539
	Amortization		1		-		-		-		-		419		-		420
			208		-		237		146		203		12,872		-620		13,046
Operating income (loss)			29		-		-		-		-203		3,919		-		3,745
Other Income (Expense):
	Interest expense		-412		-2		-43		-29		-111		-66		-		-663
	Investment income (loss), net		1		2		-		-		-14		32		-		21
	Equity in net income
	(losses) of investees, net		2,840		2,556		2,362		1,801		1,144		835		-11,505		33
	Other income (expense), net		-		-		-		-		-3		-93		-		-96
			2,429		2,556		2,319		1,772		1,016		708		-11,505		-705
Income (loss) before income taxes			2,458		2,556		2,319		1,772		813		4,627		-11,505		3,040
Income tax (expense) benefit			134		-		15		10		-11		-555		-		-407
Net income (loss)			2,592		2,556		2,334		1,782		802		4,072		-11,505		2,633
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-41		-		-41
Net income (loss) attributable
	to Comcast Corporation	$	2,592	$	2,556	$	2,334	$	1,782	$	802	$	4,031	$	-11,505	$	2,592
Comprehensive income (loss)
	attributable to Comcast Corporation	$	2,609	$	2,551	$	2,335	$	1,781	$	785	$	4,031	$	-11,483	$	2,609
Condensed Consolidating Statement of Income
For the Nine Months Ended September 30, 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	$	-	$	-	$	-	$	-	$	-	$	51,043	$	-	$	51,043
	Management fee revenue		704		-		691		432		-		-		-1,827		-
			704		-		691		432		-		51,043		-1,827		51,043
Costs and Expenses:
	Programming and production		-		-		-		-		-		15,554		-		15,554
	Other operating and administrative		471		-		691		432		697		14,231		-1,827		14,695
	Advertising, marketing and promotion		-		-		-		-		-		3,748		-		3,748
	Depreciation		25		-		-		-		-		4,682		-		4,707
	Amortization		4		-		-		-		-		1,218		-		1,222
			500		-		691		432		697		39,433		-1,827		39,926
Operating income (loss)			204		-		-		-		-697		11,610		-		11,117
Other Income (Expense):
	Interest expense		-1,199		-8		-132		-88		-360		-166		-		-1,953
	Investment income (loss), net		3		5		-		-		-9		255		-		254
	Equity in net income
	(losses) of investees, net		7,100		6,731		6,301		4,866		3,386		2,385		-30,682		87
	Other income (expense), net		-		-		-		-		-		-150		-		-150
			5,904		6,728		6,169		4,778		3,017		2,324		-30,682		-1,762
Income (loss) before income taxes			6,108		6,728		6,169		4,778		2,320		13,934		-30,682		9,355
Income tax (expense) benefit			347		1		46		31		-22		-3,162		-		-2,759
Net income (loss)			6,455		6,729		6,215		4,809		2,298		10,772		-30,682		6,596
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-141		-		-141
Net income (loss) attributable
	to Comcast Corporation	$	6,455	$	6,729	$	6,215	$	4,809	$	2,298	$	10,631	$	-30,682	$	6,455
Comprehensive income (loss)
	attributable to Comcast Corporation	$	6,402	$	6,732	$	6,217	$	4,809	$	2,302	$	10,566	$	-30,626	$	6,402

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share	'
Computation of diluted EPS	'
	Computation of Diluted EPS
			Three Months Ended September 30
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation
		shareholders	$	2,592	2,580	$	1	$	1,732	2,622	$	0.66
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			36					36
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	2,592	2,616	$	0.99	$	1,732	2,658	$	0.65
			Nine Months Ended September 30
				2014					2013
	(in millions, except per share data)			Net Income Attributable to Comcast Corporation	Shares		Per Share Amount		Net Income Attributable to Comcast Corporation	Shares		Per Share Amount
	Basic EPS attributable to Comcast Corporation
		shareholders	$	6,455	2,592	$	2.49	$	4,903	2,629	$	1.86
	Effect of dilutive securities:
		Assumed exercise or issuance of shares relating
		to stock plans			37					39
	Diluted EPS attributable to Comcast
		Corporation shareholders	$	6,455	2,629	$	2.46	$	4,903	2,668	$	1.84

Related_Party_Transactions_Tab

Related Party Transactions (Tables) (NBCUniversal Media, LLC [Member])	9 Months Ended
	Sep. 30, 2014
NBCUniversal Media, LLC [Member]	'
Related Party Transactions Condensed Financial Statements	'
	Condensed Consolidated Balance Sheet
			September 30,		December 31,
	(in millions)		2014			2013
	Transactions with Comcast and Consolidated Subsidiaries
		Receivables, net	$	241	$	228
		Accounts payable and accrued expenses related to trade creditors	$	35	$	56
		Accrued expenses and other current liabilities	$	34	$	37
		Note payable to Comcast	$	1,078	$	799
		Other noncurrent liabilities	$	383	$	383
	Condensed Consolidated Statement of Income
				Three Months Ended				Nine Months Ended
			30-Sep				30-Sep
	(in millions)			2014		2013		2014		2013
	Transactions with Comcast and Consolidated Subsidiaries
		Revenue	$	316	$	299	$	989	$	953
		Operating costs and expenses	$	-32	$	-29	$	-96	$	-126
		Other income (expense)	$	-10	$	-	$	-32	$	-

Film_and_Television_Costs_Tabl

Film and Television Costs (Tables)	9 Months Ended
	Sep. 30, 2014
Film and Television Costs	'
				September 30,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,313	$	1,630
		Completed, not released		193		70
		In production and in development		1,143		658
				2,649		2,358
	Television Costs:
		Released, less amortization		1,187		1,155
		In production and in development		445		370
				1,632		1,525
	Programming rights, less amortization			2,271		2,039
				6,552		5,922
	Less: Current portion of programming rights			992		928
	Film and television costs		$	5,560	$	4,994
NBCUniversal Media, LLC [Member]	'
Film and Television Costs	'
				September 30,		December 31,
	(in millions)			2014		2013
	Film Costs:
		Released, less amortization	$	1,313	$	1,630
		Completed, not released		193		70
		In production and in development		1,143		658
				2,649		2,358
	Television Costs:
		Released, less amortization		1,187		1,155
		In production and in development		445		370
				1,632		1,525
	Programming rights, less amortization			2,247		2,003
				6,528		5,886
	Less: Current portion of programming rights			976		903
	Film and television costs		$	5,552	$	4,983

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2014
Investment Summary	'
				September 30,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	588	$	4,345
	Equity Method:
		The Weather Channel		333		333
		Hulu		188		187
		Other		503		469
				1,024		989
	Cost Method:
		AirTouch		1,564		1,553
		Other		484		456
				2,048		2,009
	Total investments			3,660		7,343
	Less: Current investments			531		3,573
	Noncurrent investments		$	3,129	$	3,770
Investment Income (Loss), Net	'
	Investment Income (Loss), Net
			Three Months Ended				Nine Months Ended
			30-Sep				30-Sep
	(in millions)		2014		2013		2014		2013
	Gains on sales and exchanges of investments, net		$	3	$	445	$	176	$	483
	Investment impairment losses			-6		-12		-30		-25
	Unrealized gains (losses) on securities underlying prepaid
		forward sale agreements		15		345		-13		1,197
	Mark to market adjustments on derivative component of prepaid
		forward sale agreements and indexed debt instruments		-13		-348		19		-1,189
	Interest and dividend income			29		28		85		84
	Other, net			-7		6		17		-1
	Investment income (loss), net		$	21	$	464	$	254	$	549
Prepaid Forward Sale Agreements	'
	Prepaid Forward Sale Agreements
			September 30,		December 31,
	(in millions)		2014		2013
	Assets:
		Fair value equity securities held as collateral	$	444	$	3,959
	Liabilities:
		Obligations under prepaid forward sale agreements	$	117	$	811
		Derivative component of prepaid forward sale agreements		277		2,800
	Total liabilities		$	394	$	3,611
NBCUniversal Media, LLC [Member]	'
Investment Summary	'
				September 30,		December 31,
	(in millions)			2014		2013
	Fair Value Method		$	16	$	11
	Equity Method:
		The Weather Channel		333		333
		Hulu		188		187
		Other		347		332
				868		852
	Cost Method			28		21
	Total investments			912		884
	Less: Current investments			5		-
	Noncurrent Investments		$	907	$	884

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Assets and Liabilities Measured on Recurring Basis	'
	Recurring Fair Value Measures
			Fair Value as of
			30-Sep-14								31-Dec-13
	(in millions)			Level 1		Level 2		Level 3		Total		Total
	Assets
	Trading securities (see Note 6)		$	450	$	-	$	-	$	450	$	3,956
	Available-for-sale securities			6		121		10		137		389
	Interest rate swap agreements			-		81		-		81		110
	Other			-		67		1		68		81
	Total		$	456	$	269	$	11	$	736	$	4,536
	Liabilities
	Derivative component of prepaid forward sale agreements
		and indexed debt instruments (see Note 6)	$	-	$	288	$	-	$	288	$	2,816
	Contractual obligation			-		-		818		818		747
	Contingent consideration			-		-		653		653		684
	Other			-		8		-		8		16
	Total		$	-	$	296	$	1,471	$	1,767	$	4,263
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
	Changes in Contractual Obligation and Contingent Consideration
	(in millions)		Contractual Obligation		Contingent Consideration
	Balance, January 1, 2014	$	747	$	684
	Fair value adjustments		120		23
	Payments		-49		-54
	Balance, September 30, 2014	$	818	$	653
NBCUniversal Media, LLC [Member]	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
	Changes in Contractual Obligation
	(in millions)		Contractual Obligation
	Balance, January 1, 2014	$	747
	Fair value adjustments		120
	Payments		-49
	Balance, September 30, 2014	$	818

ShareBased_Compensation_Tables

Share-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Recognized Share-Based Compensation Expense	'
	Recognized Share-Based Compensation Expense
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)	2014		2013			2014		2013
	Stock options	$	38	$	34		$	121	$	102
	Restricted share units		55		44			171		130
	Employee stock purchase plans		5		4			18		15
	Total	$	98	$	82		$	310	$	247
NBCUniversal Media, LLC [Member]	'
Recognized Share-Based Compensation Expense	'
	Recognized Share-Based Compensation Expense
		Three Months Ended				Nine Months Ended
		30-Sep				30-Sep
	(in millions)	2014		2013		2014		2013
	Stock options	$	4	$	4	$	13	$	11
	Restricted share units		15		11		52		30
	Employee stock purchase plans		1		1		5		4
	Total	$	20	$	16	$	70	$	45

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Reconciliation of Unrecognized Tax Benefits	'
	(in millions)
	Balance, January 1, 2014	$	1,701
	Additions based on tax positions related to the current year		54
	Additions based on tax positions related to prior years		31
	Reductions for tax positions of prior years		-168
	Reductions due to expiration of statutes of limitations		-436
	Settlements with taxing authorities		-15
	Balance, September 30, 2014	$	1,167

Supplemental_Financial_Informa1

Supplemental Financial Information (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables	'
	Receivables
		September 30,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	6,679	$	6,972
	Less: Allowance for returns and customer incentives		284		375
	Less: Allowance for doubtful accounts		223		221
	Receivables, net	$	6,172	$	6,376
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
			September 30,		September 30,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	3	$	18
	Deferred gains (losses) on cash flow hedges			-29		-47
	Unrecognized gains (losses) on employee benefit obligations			70		-50
	Cumulative translation adjustments			-41		-31
	Accumulated other comprehensive income (loss), net of deferred taxes		$	3	$	-110
Schedule Of Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities	'
	Net Cash Provided by Operating Activities
					Nine Months Ended
					30-Sep
	(in millions)				2014		2013
	Net income				$	6,596	$	5,167
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				5,929		5,873
		Share-based compensation				386		312
		Noncash interest expense (income), net				132		122
		Equity in net (income) losses of investees, net				-87		96
		Cash received from investees				71		89
		Net (gain) loss on investment activity and other				-24		-239
		Deferred income taxes				358		-52
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				89		145
		Film and television costs, net(a)				-471		408
		Accounts payable and accrued expenses related to trade creditors				119		-108
		Other operating assets and liabilities				-796		-134
	Net cash provided by operating activities				$	12,302	$	11,679
Cash Payments For Interest and Income Taxes	'
	Cash Payments for Interest and Income Taxes
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)		2014		2013			2014		2013
	Interest	$	656	$	636		$	1,820	$	1,768
	Income taxes	$	974	$	958		$	2,878	$	3,180
NBCUniversal Media, LLC [Member]	'
Receivables	'
	Receivables
		September 30,		December 31,
	(in millions)	2014		2013
	Receivables, gross	$	5,134	$	5,348
	Less: Allowance for returns and customer incentives		281		372
	Less: Allowance for doubtful accounts		69		65
	Receivables, net	$	4,784	$	4,911
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
			September 30,		September 30,
	(in millions)		2014		2013
	Unrealized gains (losses) on marketable securities		$	3	$	-
	Deferred gains (losses) on cash flow hedges			4		-5
	Unrecognized gains (losses) on employee benefit obligations			45		-51
	Cumulative translation adjustments			-64		-47
	Accumulated other comprehensive income (loss), net of deferred taxes		$	-12	$	-103
Schedule Of Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities	'
	Net Cash Provided by Operating Activities
					Nine Months Ended
					30-Sep
	(in millions)				2014		2013
	Net income				$	2,416	$	1,319
	Adjustments to reconcile net income to net cash provided by operating activities:
		Depreciation and amortization				1,106		1,045
		Share-based compensation				-		7
		Equity in net (income) losses of investees, net				-49		105
		Cash received from investees				50		73
		Net (gain) loss on investment activity and other				83		347
		Deferred income taxes				52		-6
	Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
		Current and noncurrent receivables, net				7		142
		Film and television costs, net(a)				-483		368
		Accounts payable and accrued expenses related to trade creditors				-183		-262
		Other operating assets and liabilities				157		596
	Net cash provided by operating activities				$	3,156	$	3,734
Cash Payments For Interest and Income Taxes	'
	Cash Payments for Interest and Income Taxes
		Three Months Ended					Nine Months Ended
		30-Sep					30-Sep
	(in millions)		2014		2013			2014		2013
	Interest	$	38	$	38		$	294	$	262
	Income taxes	$	31	$	59		$	141	$	161

Financial_Data_by_Business_Seg1

Financial Data by Business Segment (Tables)	9 Months Ended
	Sep. 30, 2014
Financial Data by Business Segment	'
			Three Months Ended September 30, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	11,041	$	4,464	$	1,561	$	2,903	$	1,644
	NBCUniversal
		Cable Networks(b)		2,255		868		189		679		11
		Broadcast Television		1,770		142		24		118		15
		Filmed Entertainment(b)		1,186		151		6		145		4
		Theme Parks		786		402		68		334		184
		Headquarters and Other(c)		4		-142		84		-226		81
		Eliminations(d)		-80		-5		-		-5		-
	NBCUniversal			5,921		1,416		371		1,045		295
	Corporate and Other			174		-197		27		-224		11
	Eliminations(d)			-345		21		-		21		-
	Comcast Consolidated		$	16,791	$	5,704	$	1,959	$	3,745	$	1,950
			Three Months Ended September 30, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	10,491	$	4,246	$	1,549	$	2,697	$	1,432
	NBCUniversal
		Cable Networks(b)		2,239		853		183		670		19
		Broadcast Television		1,644		34		23		11		21
		Filmed Entertainment(b)		1,400		189		4		185		1
		Theme Parks		661		343		73		270		142
		Headquarters and Other(c)		7		-167		69		-236		101
		Eliminations(d)		-100		-2		-		-2		-
	NBCUniversal			5,851		1,250		352		898		284
	Corporate and Other			133		-178		16		-194		10
	Eliminations(d)			-324		12		-1		13		-
	Comcast Consolidated		$	16,151	$	5,330	$	1,916	$	3,414	$	1,726
			Nine Months Ended September 30, 2014
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	32,827	$	13,428	$	4,749	$	8,679	$	4,282
	NBCUniversal
		Cable Networks(b)		7,236		2,677		558		2,119		30
		Broadcast Television		6,207		504		78		426		52
		Filmed Entertainment(b)		3,713		634		16		618		8
		Theme Parks		1,888		816		210		606		486
		Headquarters and Other(c)		10		-464		244		-708		308
		Eliminations(d)		-241		-6		-		-6		-
	NBCUniversal			18,813		4,161		1,106		3,055		884
	Corporate and Other			520		-532		74		-606		30
	Eliminations(d)			-1,117		-11		-		-11		-
	Comcast Consolidated		$	51,043	$	17,046	$	5,929	$	11,117	$	5,196
			Nine Months Ended September 30, 2013
	(in millions)			Revenue(e)		Operating Income (Loss) Before Depreciation and Amortization(f)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Communications(a)		$	31,175	$	12,800	$	4,780	$	8,020	$	3,766
	NBCUniversal
		Cable Networks(b)		6,877		2,572		549		2,023		67
		Broadcast Television		4,893		205		74		131		38
		Filmed Entertainment(b)		4,004		291		11		280		4
		Theme Parks		1,669		747		218		529		427
		Headquarters and Other(c)		25		-416		193		-609		271
		Eliminations(d)		-282		-5		-		-5		-
	NBCUniversal			17,186		3,394		1,045		2,349		807
	Corporate and Other			431		-380		48		-428		20
	Eliminations(d)			-1,061		-25		-		-25		-
	Comcast Consolidated		$	47,731	$	15,789	$	5,873	$	9,916	$	4,593
Cable Segment Revenue Sources	'
			Three Months Ended				Nine Months Ended
			30-Sep				30-Sep
			2014		2013		2014		2013
	Residential:
		Video	46.9	%	48.9	%	47.5	%	49.4	%
		High-speed Internet	25.7	%	24.7	%	25.6	%	24.6	%
		Voice	8.3	%	8.8	%	8.4	%	8.8	%
	Business services		9.2	%	8	%	8.8	%	7.6	%
	Advertising		5.5	%	5.2	%	5.3	%	5.1	%
	Other		4.4	%	4.4	%	4.4	%	4.5	%
	Total		100	%	100	%	100	%	100	%
NBCUniversal Media, LLC [Member]	'
Financial Data by Business Segment	'
			Three Months Ended September 30, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,255	$	868	$	189	$	679	$	11
		Broadcast Television		1,770		142		24		118		15
		Filmed Entertainment(a)		1,186		151		6		145		4
		Theme Parks		786		402		68		334		184
		Headquarters and Other(b)		4		-142		84		-226		81
		Eliminations(c)		-80		-5		-		-5		-
	Total		$	5,921	$	1,416	$	371	$	1,045	$	295
			Three Months Ended September 30, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
		Cable Networks(a)	$	2,239	$	853	$	183	$	670	$	19
		Broadcast Television		1,644		34		23		11		21
		Filmed Entertainment(a)		1,400		189		4		185		1
		Theme Parks		661		343		73		270		142
		Headquarters and Other(b)		7		-167		69		-236		101
		Eliminations(c)		-100		-2		-		-2		-
	Total		$	5,851	$	1,250	$	352	$	898	$	284
			Nine Months Ended September 30, 2014
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks(a)		$	7,236	$	2,677	$	558	$	2,119	$	30
	Broadcast Television			6,207		504		78		426		52
	Filmed Entertainment(a)			3,713		634		16		618		8
	Theme Parks			1,888		816		210		606		486
	Headquarters and Other(b)			10		-464		244		-708		308
	Eliminations(c)			-241		-6		-		-6		-
	Total		$	18,813	$	4,161	$	1,106	$	3,055	$	884
			Nine Months Ended September 30, 2013
	(in millions)			Revenue(d)		Operating Income (Loss) Before Depreciation and Amortization(e)		Depreciation and Amortization		Operating Income (Loss)		Capital Expenditures
	Cable Networks(a)		$	6,877	$	2,572	$	549	$	2,023	$	67
	Broadcast Television			4,893		205		74		131		38
	Filmed Entertainment(a)			4,004		291		11		280		4
	Theme Parks			1,669		747		218		529		427
	Headquarters and Other(b)			25		-416		193		-609		271
	Eliminations(c)			-282		-5		-		-5		-
	Total		$	17,186	$	3,394	$	1,045	$	2,349	$	807

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2014
Condensed Consolidating Financial Information [Abstract]	'
Condensed Consolidating Financial Statements	'
	Condensed Consolidating Balance Sheet
	30-Sep-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	$	-	$	-	$	-	$	-	$	196	$	4,351	$	-	$	4,547
		Investments		-		-		-		-		5		526		-		531
		Receivables, net		-		-		-		-		-		6,172		-		6,172
		Programming rights		-		-		-		-		-		992		-		992
		Other current assets		222		-		-		-		43		1,429		-		1,694
	Total current assets			222		-		-		-		244		13,470		-		13,936
	Film and television costs			-		-		-		-		-		5,560		-		5,560
	Investments			21		-		-		-		373		2,735		-		3,129
	Investments in and amounts due from subsidiaries eliminated upon consolidation			84,503		103,462		110,327		59,160		41,038		95,665		-494,155		-
	Property and equipment, net			202		-		-		-		-		30,160		-		30,362
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,323		-		27,323
	Other intangible assets, net			9		-		-		-		-		17,080		-		17,089
	Other noncurrent assets, net			1,187		148		-		-		94		2,059		-1,014		2,474
	Total assets		$	86,144	$	103,610	$	110,327	$	59,160	$	41,749	$	253,416	$	-495,169	$	159,237
	Liabilities and Equity
		Accounts payable and accrued expenses related to  trade creditors	$	11	$	-	$	-	$	-	$	-	$	5,669	$	-	$	5,680
		Accrued participations and residuals		-		-		-		-		-		1,444		-		1,444
		Accrued expenses and other current liabilities		1,374		283		347		21		415		3,997		-		6,437
		Current portion of long-term debt		900		-		-		679		1,008		936		-		3,523
	Total current liabilities			2,285		283		347		700		1,423		12,046		-		17,084
	Long-term debt, less current portion			28,401		131		1,827		822		9,219		4,427		-		44,827
	Deferred income taxes			-		719		-		-		59		32,319		-870		32,227
	Other noncurrent liabilities			2,160		-		-		-		945		7,427		-144		10,388
	Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		1,058		-		1,058
	Equity:
		Common stock		30		-		-		-		-		-		-		30
		Other shareholders’ equity		53,268		102,477		108,153		57,638		30,103		195,784		-494,155		53,268
	Total Comcast Corporation
		shareholders’ equity		53,298		102,477		108,153		57,638		30,103		195,784		-494,155		53,298
	Noncontrolling interests			-		-		-		-		-		355		-		355
	Total equity			53,298		102,477		108,153		57,638		30,103		196,139		-494,155		53,653
	Total liabilities and equity		$	86,144	$	103,610	$	110,327	$	59,160	$	41,749	$	253,416	$	-495,169	$	159,237
	Condensed Consolidating Balance Sheet
	31-Dec-13
	(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
	Assets
		Cash and cash equivalents	$	-	$	-	$	-	$	-	$	336	$	1,382	$	-	$	1,718
		Investments		-		-		-		-		-		3,573		-		3,573
		Receivables, net		-		-		-		-		-		6,376		-		6,376
		Programming rights		-		-		-		-		-		928		-		928
		Other current assets		237		-		-		-		35		1,208		-		1,480
	Total current assets			237		-		-		-		371		13,467		-		14,075
	Film and television costs			-		-		-		-		-		4,994		-		4,994
	Investments			11		-		-		-		374		3,385		-		3,770
	Investments in and amounts due from subsidiaries eliminated upon consolidation			79,956		97,429		102,673		54,724		40,644		85,164		-460,590		-
	Property and equipment, net			220		-		-		-		-		29,620		-		29,840
	Franchise rights			-		-		-		-		-		59,364		-		59,364
	Goodwill			-		-		-		-		-		27,098		-		27,098
	Other intangible assets, net			11		-		-		-		-		17,318		-		17,329
	Other noncurrent assets, net			1,078		145		-		-		103		1,899		-882		2,343
	Total assets		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
	Liabilities and Equity
		Accounts payable and accrued expenses related to trade creditors	$	8	$	-	$	-	$	-	$	-	$	5,520	$	-	$	5,528
		Accrued participations and residuals		-		-		-		-		-		1,239		-		1,239
		Accrued expenses and other current liabilities		1,371		266		180		47		323		6,678		-		8,865
		Current portion of long-term debt		2,351		-		-		-		903		26		-		3,280
	Total current liabilities			3,730		266		180		47		1,226		13,463		-		18,912
	Long-term debt, less current portion			25,170		132		1,827		1,505		10,236		5,697		-		44,567
Deferred income taxes			-		777		-		-		59		31,840		-741		31,935
Other noncurrent liabilities			1,919		-		-		-		931		8,675		-141		11,384
Redeemable noncontrolling interests and redeemable subsidiary preferred stock			-		-		-		-		-		957		-		957
Equity:
	Common stock		30		-		-		-		-		-		-		30
	Other shareholders’ equity		50,664		96,399		100,666		53,172		29,040		181,313		-460,590		50,664
Total Comcast Corporation shareholders’ equity			50,694		96,399		100,666		53,172		29,040		181,313		-460,590		50,694
Noncontrolling interests			-		-		-		-		-		364		-		364
Total equity			50,694		96,399		100,666		53,172		29,040		181,677		-460,590		51,058
Total liabilities and equity		$	81,513	$	97,574	$	102,673	$	54,724	$	41,492	$	242,309	$	-461,472	$	158,813
Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 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		$	-433	$	11	$	84	$	-88	$	-998	$	13,726	$	-	$	12,302
Investing Activities
	Net transactions with affiliates		2,349		-11		-84		88		1,761		-4,103		-		-
	Capital expenditures		-3		-		-		-		-		-5,193		-		-5,196
	Cash paid for intangible assets		-2		-		-		-		-		-733		-		-735
	Acquisitions and construction of real estate properties		-		-		-		-		-		-28		-		-28
	Acquisitions, net of cash acquired		-		-		-		-		-		-477		-		-477
	Proceeds from sales of businesses and investments		-		-		-		-		1		621		-		622
	Return of capital from investees		-		-		-		-		-		6		-		6
	Purchases of investments		-10		-		-		-		-6		-129		-		-145
	Other		-		-		-		-		4		-131		-		-127
Net cash provided by (used in) investing activities			2,334		-11		-84		88		1,760		-10,167		-		-6,080
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		-1,350		-		-		-		-		913		-		-437
	Proceeds from borrowings		4,180		-		-		-		-		2		-		4,182
	Repurchases and repayments of debt		-1,000		-		-		-		-902		-1,270		-		-3,172
	Repurchases and retirements of common stock		-2,250		-		-		-		-		-		-		-2,250
	Dividends paid		-1,676		-		-		-		-		-		-		-1,676
	Issuances of common stock		33		-		-		-		-		-		-		33
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-170		-		-170
	Other		162		-		-		-		-		-65		-		97
Net cash provided by (used in) financing activities			-1,901		-		-		-		-902		-590		-		-3,393
Increase (decrease) in cash and cash equivalents			-		-		-		-		-140		2,969		-		2,829
Cash and cash equivalents, beginning of period			-		-		-		-		336		1,382		-		1,718
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	196	$	4,351	$	-	$	4,547
Condensed Consolidating Statement of Cash Flows
For the Nine Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non-Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Net cash provided by (used in) operating activities		$	-451	$	-7	$	-3	$	-99	$	-767	$	13,006	$	-	$	11,679
Investing Activities
	Net transactions with affiliates		-116		7		2,100		337		-900		-1,428		-		-
	Capital expenditures		-3		-		-		-		-		-4,590		-		-4,593
	Cash paid for intangible assets		-1		-		-		-		-		-693		-		-694
	Acquisitions and construction of real estate properties		-		-		-		-		-		-1,705		-		-1,705
	Acquisitions, net of cash acquired		-		-		-		-		-		-42		-		-42
	Proceeds from sales of businesses and investments		-		-		-		-		-		655		-		655
	Return of capital from investees		-		-		-		-		128		18		-		146
	Purchases of investments		-8		-		-		-		-2		-1,167		-		-1,177
	Other		-		-		-		-		-20		103		-		83
Net cash provided by (used in) investing activities			-128		7		2,100		337		-794		-8,849		-		-7,327
Financing Activities
	Proceeds from (repayments of) short-term borrowings, net		400		-		-		-		-		-5		-		395
	Proceeds from borrowings		2,933		-		-		-		-		-		-		2,933
	Repurchases and repayments of debt		-		-		-2,097		-238		-88		-19		-		-2,442
	Repurchases and retirements of common stock		-1,500		-		-		-		-		-		-		-1,500
	Dividends paid		-1,454		-		-		-		-		-		-		-1,454
	Issuances of common stock		35		-		-		-		-		-		-		35
	Purchase of NBCUniversal noncontrolling common equity interest		-		-		-		-		-3,200		-7,561		-		-10,761
	Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock		-		-		-		-		-		-164		-		-164
	Settlement of Station Venture liability		-		-		-		-		-		-602		-		-602
	Other		165		-		-		-		-40		-265		-		-140
Net cash provided by (used in) financing activities			579		-		-2,097		-238		-3,328		-8,616		-		-13,700
Increase (decrease) in cash and cash equivalents			-		-		-		-		-4,889		-4,459		-		-9,348
Cash and cash equivalents, beginning of period			-		-		-		-		5,129		5,822		-		10,951
Cash and cash equivalents, end of period		$	-	$	-	$	-	$	-	$	240	$	1,363	$	-	$	1,603
Condensed Consolidating Statement of Income
For the Three Months Ended September 30, 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	$	-	$	-	$	-	$	-	$	-	$	16,791	$	-	$	16,791
	Management fee revenue		237		-		237		146		-		-		-620		-
			237		-		237		146		-		16,791		-620		16,791
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,772		-		4,772
	Other operating and administrative		197		-		237		146		203		4,856		-620		5,019
	Advertising, marketing and promotion		-		-		-		-		-		1,296		-		1,296
	Depreciation		10		-		-		-		-		1,529		-		1,539
	Amortization		1		-		-		-		-		419		-		420
			208		-		237		146		203		12,872		-620		13,046
Operating income (loss)			29		-		-		-		-203		3,919		-		3,745
Other Income (Expense):
	Interest expense		-412		-2		-43		-29		-111		-66		-		-663
	Investment income (loss), net		1		2		-		-		-14		32		-		21
	Equity in net income
	(losses) of investees, net		2,840		2,556		2,362		1,801		1,144		835		-11,505		33
	Other income (expense), net		-		-		-		-		-3		-93		-		-96
			2,429		2,556		2,319		1,772		1,016		708		-11,505		-705
Income (loss) before income taxes			2,458		2,556		2,319		1,772		813		4,627		-11,505		3,040
Income tax (expense) benefit			134		-		15		10		-11		-555		-		-407
Net income (loss)			2,592		2,556		2,334		1,782		802		4,072		-11,505		2,633
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-41		-		-41
Net income (loss) attributable
	to Comcast Corporation	$	2,592	$	2,556	$	2,334	$	1,782	$	802	$	4,031	$	-11,505	$	2,592
Comprehensive income (loss)
	attributable to Comcast Corporation	$	2,609	$	2,551	$	2,335	$	1,781	$	785	$	4,031	$	-11,483	$	2,609
Condensed Consolidating Statement of Income
For the Three Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	16,151	$	-	$	16,151
	Management fee revenue		225		-		219		137		-		-		-581		-
			225		-		219		137		-		16,151		-581		16,151
Costs and Expenses:
	Programming and production		-		-		-		-		-		4,787		-		4,787
	Other operating and administrative		92		-		219		137		211		4,673		-581		4,751
	Advertising, marketing and promotion		-		-		-		-		-		1,283		-		1,283
	Depreciation		7		-		-		-		-		1,513		-		1,520
	Amortization		1		-		-		-		-		395		-		396
			100		-		219		137		211		12,651		-581		12,737
Operating income (loss)			125		-		-		-		-211		3,500		-		3,414
Other Income (Expense):
	Interest expense		-382		-3		-45		-30		-123		-56		-		-639
	Investment income (loss), net		1		-5		-		-		-3		471		-		464
	Equity in net income (losses) of
	investees, net		1,898		1,787		1,850		1,371		576		106		-7,718		-130
	Other income (expense), net		-		-		-		-		-		-310		-		-310
			1,517		1,779		1,805		1,341		450		211		-7,718		-615
Income (loss) before income taxes			1,642		1,779		1,805		1,341		239		3,711		-7,718		2,799
Income tax (expense) benefit			90		3		15		11		-3		-1,137		-		-1,021
Net income (loss)			1,732		1,782		1,820		1,352		236		2,574		-7,718		1,778
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-46		-		-46
Net income (loss)
	attributable to Comcast Corporation	$	1,732	$	1,782	$	1,820	$	1,352	$	236	$	2,528	$	-7,718	$	1,732
Comprehensive
	income (loss) attributable to Comcast Corporation	$	1,545	$	1,828	$	1,864	$	1,415	$	244	$	2,327	$	-7,678	$	1,545
Condensed Consolidating Statement of Income
For the Nine Months Ended September 30, 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	$	-	$	-	$	-	$	-	$	-	$	51,043	$	-	$	51,043
	Management fee revenue		704		-		691		432		-		-		-1,827		-
			704		-		691		432		-		51,043		-1,827		51,043
Costs and Expenses:
	Programming and production		-		-		-		-		-		15,554		-		15,554
	Other operating and administrative		471		-		691		432		697		14,231		-1,827		14,695
	Advertising, marketing and promotion		-		-		-		-		-		3,748		-		3,748
	Depreciation		25		-		-		-		-		4,682		-		4,707
	Amortization		4		-		-		-		-		1,218		-		1,222
			500		-		691		432		697		39,433		-1,827		39,926
Operating income (loss)			204		-		-		-		-697		11,610		-		11,117
Other Income (Expense):
	Interest expense		-1,199		-8		-132		-88		-360		-166		-		-1,953
	Investment income (loss), net		3		5		-		-		-9		255		-		254
	Equity in net income
	(losses) of investees, net		7,100		6,731		6,301		4,866		3,386		2,385		-30,682		87
	Other income (expense), net		-		-		-		-		-		-150		-		-150
			5,904		6,728		6,169		4,778		3,017		2,324		-30,682		-1,762
Income (loss) before income taxes			6,108		6,728		6,169		4,778		2,320		13,934		-30,682		9,355
Income tax (expense) benefit			347		1		46		31		-22		-3,162		-		-2,759
Net income (loss)			6,455		6,729		6,215		4,809		2,298		10,772		-30,682		6,596
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-141		-		-141
Net income (loss) attributable
	to Comcast Corporation	$	6,455	$	6,729	$	6,215	$	4,809	$	2,298	$	10,631	$	-30,682	$	6,455
Comprehensive income (loss)
	attributable to Comcast Corporation	$	6,402	$	6,732	$	6,217	$	4,809	$	2,302	$	10,566	$	-30,626	$	6,402
Condensed Consolidating Statement of Income
For the Nine Months Ended September 30, 2013
(in millions)			Comcast Parent		Comcast Holdings		CCCL Parent		Combined CCHMO Parents		NBCUniversal Media Parent		Non- Guarantor Subsidiaries		Elimination and Consolidation Adjustments		Consolidated Comcast Corporation
Revenue:
	Service revenue	$	-	$	-	$	-	$	-	$	-	$	47,731	$	-	$	47,731
	Management fee revenue		668		-		650		407		-		-		-1,725		-
			668		-		650		407		-		47,731		-1,725		47,731
Costs and Expenses:
	Programming and production		-		-		-		-		-		14,418		-		14,418
	Other operating and administrative		291		-		650		407		641		13,523		-1,725		13,787
	Advertising, marketing and promotion		-		-		-		-		-		3,737		-		3,737
	Depreciation		22		-		-		-		-		4,647		-		4,669
	Amortization		4		-		-		-		-		1,200		-		1,204
			317		-		650		407		641		37,525		-1,725		37,815
Operating income (loss)			351		-		-		-		-641		10,206		-		9,916
Other Income (Expense):
	Interest expense		-1,141		-8		-169		-96		-366		-148		-		-1,928
	Investment income (loss), net		3		-2		-		-		-2		550		-		549
	Equity in net income
	(losses) of investees, net		5,416		5,438		5,448		3,982		2,236		1,118		-23,734		-96
	Other income (expense), net		-2		-		2		-		-		-280		-		-280
			4,276		5,428		5,281		3,886		1,868		1,240		-23,734		-1,755
Income (loss) before income taxes			4,627		5,428		5,281		3,886		1,227		11,446		-23,734		8,161
Income tax (expense) benefit			276		4		58		34		-13		-3,353		-		-2,994
Net income (loss)			4,903		5,432		5,339		3,920		1,214		8,093		-23,734		5,167
Net (income) loss attributable
	to noncontrolling interests and redeemable subsidiary preferred stock		-		-		-		-		-		-264		-		-264
Net income (loss) attributable
	to Comcast Corporation	$	4,903	$	5,432	$	5,339	$	3,920	$	1,214	$	7,829	$	-23,734	$	4,903
Comprehensive income (loss)
	attributable to Comcast Corporation	$	4,804	$	5,471	$	5,386	$	3,983	$	1,176	$	7,741	$	-23,757	$	4,804

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share	'	'	'	'
Net income attributable to Parent	$2,592	$1,732	$6,455	$4,903
Basic shares attributable to Comcast Corporation shareholders	2,580	2,622	2,592	2,629
Assumed exercise or issuance of shares relating to stock plans	36	36	37	39
Diluted shares attributable to Comcast Corporation shareholders	2,616	2,658	2,629	2,668
Basic earnings per common share attributable to Comcast Corporation shareholders	$1	$0.66	$2.49	$1.86
Diluted earnings per common share attributable to Comcast Corporation shareholders	$0.99	$0.65	$2.46	$1.84
Excluded shares from diluted EPS because their inclusion would have an antidilutive effect	17	18	13	13

Significant_Transactions_Narra

Significant Transactions (Narrative) (Details)	Sep. 30, 2014
Significant Transactions [Line Items]	'
Company Shares Exchanged For Each Acquiree Share	2.875
Acquiree Stockholders Percentage Ownership In Parent Company	24.00%
Merger Agreement Undertaking Number Of Divested Customers [Member]	'
Significant Transactions [Line Items]	'
Number of customers	3,000,000
Divestiture Transactions Net Disposition Of Customers [Member]	'
Significant Transactions [Line Items]	'
Number of customers	3,900,000
Divestiture Transactions Customers To Be Spun Off In SpinCo [Member]	'
Significant Transactions [Line Items]	'
Number of customers	2,500,000
Divestiture Transactions Like Kind Divestiture Of Time Warner Cable Customers [Member]	'
Significant Transactions [Line Items]	'
Number of customers	1,500,000
Divestiture Transactions Like Kind Receipt Of Charter Communications Customers [Member]	'
Significant Transactions [Line Items]	'
Number of customers	1,700,000
Divestiture Transactions Sale Of Time Warner Cable Customers [Member]	'
Significant Transactions [Line Items]	'
Number of customers	1,500,000
Comcast Corporate Shareholders [Member]	'
Significant Transactions [Line Items]	'
Ownership Percentage In SpinCo	67.00%
Ownership Percentage In New Charter	10.00%
New Charter [Member]	'
Significant Transactions [Line Items]	'
Ownership Percentage In SpinCo	33.00%

Related_Party_Transactions_Nar

Related Party Transactions (Narrative) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
			NBCUniversal Media, LLC [Member]	NBCUniversal Media, LLC [Member]	Nbcuniversal Holdings Preferred Stock [Member]	Carrying Value Of Related Party Contractual Obligation [Member]	Comcast Corporation And NBCUniversal Media LLC Revolving Credit Agreement [Member]
					NBCUniversal Media, LLC [Member]	NBCUniversal Media, LLC [Member]	NBCUniversal Media, LLC [Member]
Preferred stock liquidition preference value	'	'	'	'	$9,400,000,000	'	'
Revolving Credit Agreement Capacity	'	'	'	'	'	'	3,000,000,000
Preferred stock dividend rate percentage	'	'	'	'	8.25%	'	'
Borrowing margin for LIBOR based borrowings	'	'	1.00%	'	'	'	'
Other noncurrent liabilities	$10,388,000,000	$11,384,000,000	$3,514,000,000	$3,412,000,000	'	$383,000,000	'

Related_Party_Transactions_Con

Related Party Transactions - Consolidated Balance Sheet (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Receivables, net	$6,172	$6,376
Accounts payable and accrued expenses related to trade creditors	5,680	5,528
Accrued expenses and other current liabilities	5,461	7,967
Other noncurrent liabilities	10,388	11,384
NBCUniversal Media, LLC [Member]	'	'
Receivables, net	4,784	4,911
Accounts payable and accrued expenses related to trade creditors	1,325	1,583
Accrued expenses and other current liabilities	1,424	1,465
Note payable to Comcast	1,078	799
Other noncurrent liabilities	3,514	3,412
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]	'	'
Receivables, net	241	228
Accounts payable and accrued expenses related to trade creditors	35	56
Accrued expenses and other current liabilities	34	37
Note payable to Comcast	1,078	799
Other noncurrent liabilities	$383	$383

Related_Party_Transactions_Con1

Related Party Transactions - Consolidated Statement of Income (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$16,791,000,000	$16,151,000,000	$51,043,000,000	$47,731,000,000
NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	5,921,000,000	5,851,000,000	18,813,000,000	17,186,000,000
Transactions With Comcast And Consolidated Subsidiaries [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	316,000,000	299,000,000	989,000,000	953,000,000
Operating costs and expenses	-32,000,000	-29,000,000	-96,000,000	-126,000,000
Other income (expense)	($10,000,000)	'	($32,000,000)	'

Film_and_Television_Costs_Film

Film and Television Costs (Film and Television Costs)(Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Film And Television Costs [Line Items]	'	'
Programming rights, less amortization	$2,271	$2,039
Total film costs, television costs and programming rights	6,552	5,922
Less: Current portion of programming rights	992	928
Film and television costs	5,560	4,994
NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Programming rights, less amortization	2,247	2,003
Total film costs, television costs and programming rights	6,528	5,886
Less: Current portion of programming rights	976	903
Film and television costs	5,552	4,983
Film Costs [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,313	1,630
Completed, not released	193	70
In production and in development	1,143	658
Total film costs	2,649	2,358
Film Costs [Member] | NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,313	1,630
Completed, not released	193	70
In production and in development	1,143	658
Total film costs	2,649	2,358
Television Costs [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,187	1,155
In production and in development	445	370
Total television costs	1,632	1,525
Television Costs [Member] | NBCUniversal Media, LLC [Member]	'	'
Film And Television Costs [Line Items]	'	'
Released, less amortization	1,187	1,155
In production and in development	445	370
Total television costs	$1,632	$1,525

Investments_Details

Investments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair value method	$588	$4,345
Equity method	1,024	989
Cost method	2,048	2,009
Total Investments	3,660	7,343
Less: Current investments	531	3,573
Noncurrent investments	3,129	3,770
NBCUniversal Media, LLC [Member]	'	'
Fair value method	16	11
Equity method	868	852
Cost method	28	21
Total Investments	912	884
Less: Current investments	5	'
Noncurrent investments	907	884
Air Touch [Member]	'	'
Cost method	1,564	1,553
Other Investment [Member]	'	'
Equity method	503	469
Cost method	484	456
Other Investment [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	347	332
The Weather Channel [Member]	'	'
Equity method	333	333
The Weather Channel [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	333	333
Hulu [Member]	'	'
Equity method	188	187
Hulu [Member] | NBCUniversal Media, LLC [Member]	'	'
Equity method	$188	$187

Investments_Investment_Income_

Investments (Investment Income (Loss), Net) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Gains on sales and exchanges of investments, net	$3,000,000	$445,000,000	$176,000,000	$483,000,000
Investment impairment losses	-6,000,000	-12,000,000	-30,000,000	-25,000,000
Unrealized gains (losses) on securities underlying prepaid forward sale agreements	15,000,000	345,000,000	-13,000,000	1,197,000,000
Mark to market adjustments on derivative component of prepaid forward sale agreements and indexed debt instruments	-13,000,000	-348,000,000	19,000,000	-1,189,000,000
Interest and dividend income	29,000,000	28,000,000	85,000,000	84,000,000
Other, net	-7,000,000	6,000,000	17,000,000	-1,000,000
Investment income (loss), net	21,000,000	464,000,000	254,000,000	549,000,000
NBCUniversal Media, LLC [Member]	'	'	'	'
Investment income (loss), net	$3,000,000	$1,000,000	$18,000,000	$9,000,000

Investments_Fair_Value_Method_

Investments (Fair Value Method Investments) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair value equity securities held as collateral	$444,000,000	$3,959,000,000
Obligations under prepaid forward sale agreements	117,000,000	811,000,000
Derivative component of prepaid forward sale agreements	277,000,000	2,800,000,000
Total liabilities associated with prepaid forward sale agreements	394,000,000	3,611,000,000
Fair Value Equity Securities Settlement	$3,200,000,000	'

Investments_Cost_Method_Invest

Investments (Cost Method Investments) (Details) (Air Touch [Member], USD $)	Sep. 30, 2014
Air Touch [Member]	'
Fair value of AirTouch preferred stock related to redeemable preferred shares	$1,700,000,000
Fair value of redeemable preferred stock	$1,700,000,000

LongTerm_Debt_Narrative_Detail

Long-Term Debt (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Total debt	$48,400,000,000	'
Long-term Debt, Fair Value	54,400,000,000	'
Amounts available under revolving credit facilities	6,400,000,000	'
Repurchases and repayments of debt	3,172,000,000	2,442,000,000
Comcast ownership in cable holding company subsidiaries	100.00%	'
Proceeds from (repayments of) short-term borrowings, net	-437,000,000	395,000,000
NBCUniversal Media, LLC [Member]	'	'
Total debt	10,300,000,000	'
Long-term Debt, Fair Value	11,300,000,000	'
Comcast ownership in cable holding company subsidiaries	100.00%	'
Related Party Aggregate Principal Amount Senior Notes Not Subject To Guarantee	4,000,000,000	'
Related Party Credit Facility Not Subject To Guarantee	1,350,000,000	'
Related Party Liquidation Preference Preferred Stock Not Subject To Guarantee	725,000,000	'
NBCUniversal Enterprise Commercial Paper [Member]	'	'
Credit facility borrowing capacity	1,350,000,000	'
Commercial paper	910,000,000	'
Proceeds from (repayments of) short-term borrowings, net	990,000,000	'
Comcast And Comcast Cable Revolving Credit Facility [Member] | NBCUniversal Media, LLC [Member]	'	'
Debt Instrument, Maturity Date, Description	'2017	'
Guarantee Obligations Revolving Credit Facility	6,250,000,000	'
Comcast And Comcast Cable Debt Securities [Member] | NBCUniversal Media, LLC [Member]	'	'
Guarantee Obligations Current Principal Balance	32,600,000,000	'
NBCUniversal Enterprise Credit Facility [Member]	'	'
Debt Instrument, Maturity Date, Description	'March 2018	'
Credit facility borrowing capacity	1,350,000,000	'
Amounts available under revolving credit facilities	440,000,000	'
Repurchases and repayments of debt	1,250,000,000	'
Senior 3.60% Notes Due 2024 [Member]	'	'
Principal amount	1,200,000,000	'
Interest rate	3.60%	'
Debt Instrument, Maturity Date, Description	'2024	'
Senior 4.75% Notes Due 2044 [Member]	'	'
Principal amount	1,000,000,000	'
Interest rate	4.75%	'
Debt Instrument, Maturity Date, Description	'2044	'
Senior 5.3% Notes Due 2014 [Member]	'	'
Interest rate	5.30%	'
Debt Instrument, Maturity Date, Description	'2014	'
Repurchases and repayments of debt	1,000,000,000	'
Senior 2.1% Notes Due 2014 [Member]	'	'
Interest rate	2.10%	'
Debt Instrument, Maturity Date, Description	'April 2014	'
Repurchases and repayments of debt	900,000,000	'
Senior 2.1% Notes Due 2014 [Member] | NBCUniversal Media, LLC [Member]	'	'
Interest rate	2.10%	'
Debt Instrument, Maturity Date, Description	'April 2014	'
Repurchases and repayments of debt	900,000,000	'
Senior 3.375% Notes Due 2025 [Member]	'	'
Principal amount	1,000,000,000	'
Interest rate	3.38%	'
Debt Instrument, Maturity Date, Description	'2025	'
Senior 4.200% Notes Due 2034 [Member]	'	'
Principal amount	$1,000,000,000	'
Interest rate	4.20%	'
Debt Instrument, Maturity Date, Description	'2034	'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Trading securities	$450	$3,956
Available-for-sale Securities	137	389
Interest rate swap agreements	81	110
Other [assets]	68	81
Fair Value, Assets Measured on Recurring Basis, Total	736	4,536
Derivative component of prepaid forward sale agreements and indexed debt instruments	288	2,816
Contractual obligation	818	747
Contingent consideration	653	684
Other [liabilities]	8	16
Fair Value Liabilities Measured On Recurring Basis	1,767	4,263
Fair Value, Inputs, Level 1 [Member]	'	'
Trading securities	450	'
Available-for-sale Securities	6	'
Fair Value, Assets Measured on Recurring Basis, Total	456	'
Fair Value, Inputs, Level 2 [Member]	'	'
Available-for-sale Securities	121	'
Interest rate swap agreements	81	'
Other [assets]	67	'
Fair Value, Assets Measured on Recurring Basis, Total	269	'
Derivative component of prepaid forward sale agreements and indexed debt instruments	288	'
Other [liabilities]	8	'
Fair Value Liabilities Measured On Recurring Basis	296	'
Fair Value, Inputs, Level 3 [Member]	'	'
Available-for-sale Securities	10	'
Other [assets]	1	'
Fair Value, Assets Measured on Recurring Basis, Total	11	'
Contractual obligation	818	'
Contingent consideration	653	'
Fair Value Liabilities Measured On Recurring Basis	$1,471	'

Fair_Value_Disclosure_Rollforw

Fair Value Disclosure Rollforward (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
NBCUniversal Enterprise [Member]	'
Fair value of redeemable preferred stock	$752
Contractual Obligation [Member]	'
Beginning balance	747
Fair value adjustments	120
Payments	-49
Ending balance	818
Contractual Obligation [Member] | NBCUniversal Media, LLC [Member]	'
Beginning balance	747
Fair value adjustments	120
Payments	-49
Ending balance	818
Discount rate used to determine fair value, minimum	12.00%
Discount rate used to determine fair value, maximum	13.00%
Contingent Consideration [Member]	'
Beginning balance	684
Fair value adjustments	23
Payments	-54
Ending balance	$653
Contractual Obligation And Contingent Consideration Discount Rates [Member]	'
Discount rate used to determine fair value, minimum	5.00%
Discount rate used to determine fair value, maximum	13.00%

ShareBased_Compensation_Narrat

Share-Based Compensation (Narrative) (Details) (USD $)	9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014
Number of stock options granted	16.4
Number of restricted share units granted	5.4
Weighted average fair value of stock options granted	$11.09
Weighed average fair value of restricted share units granted	$46.57
Stock Options [Member]	'
Unrecognized pretax compensation expense on nonvested awards	$356
Restricted Share Units [Member]	'
Unrecognized pretax compensation expense on nonvested awards	$489

ShareBased_Compensation_Recogn

Share-Based Compensation (Recognized Share-Based Compensation Expense) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Recognized share-based compensation expense	$98	$82	$310	$247
NBCUniversal Media, LLC [Member]	'	'	'	'
Recognized share-based compensation expense	20	16	70	45
Stock Options [Member]	'	'	'	'
Recognized share-based compensation expense	38	34	121	102
Stock Options [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Recognized share-based compensation expense	4	4	13	11
Restricted Share Units [Member]	'	'	'	'
Recognized share-based compensation expense	55	44	171	130
Restricted Share Units [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Recognized share-based compensation expense	15	11	52	30
Employee Stock Purchase Plan [Member]	'	'	'	'
Recognized share-based compensation expense	5	4	18	15
Employee Stock Purchase Plan [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Recognized share-based compensation expense	$1	$1	$5	$4

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Unrecognized tax benefits, interest on income taxes accrued	$460	$780
Change In Income Tax Expense Related To Effectively Settled Uncertain Tax Positions	$724	'

Income_Taxes_Reconciliation_of

Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014
Income Taxes [Abstract]	'
Beginning balance	$1,701
Additions based on tax positions related to the current year	54
Additions based on tax positions related to prior years	31
Reductions for tax positions of prior years	-168
Reductions due to expiration of statutes of limitations	-436
Settlements with taxing authorities	-15
Ending balance	$1,167

Supplemental_Financial_Informa2

Supplemental Financial Information (Receivables)(Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Receivables, gross	$6,679	$6,972
Less: Allowance for returns and customer incentives	284	375
Less: Allowance for doubtful accounts	223	221
Receivables, net	6,172	6,376
NBCUniversal Media, LLC [Member]	'	'
Receivables, gross	5,134	5,348
Less: Allowance for returns and customer incentives	281	372
Less: Allowance for doubtful accounts	69	65
Receivables, net	$4,784	$4,911

Supplemental_Financial_Informa3

Supplemental Financial Information (Components of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Unrealized gains (losses) on marketable securities	$3	'	$18
Deferred gains (losses) on cash flow hedges	-29	'	-47
Unrecognized gains (losses) on employee benefit obligations	70	'	-50
Cumulative translation adjustments	-41	'	-31
Accumulated other comprehensive income (loss), net of deferred taxes	3	56	-110
NBCUniversal Media, LLC [Member]	'	'	'
Unrealized gains (losses) on marketable securities	3	'	'
Deferred gains (losses) on cash flow hedges	4	'	-5
Unrecognized gains (losses) on employee benefit obligations	45	'	-51
Cumulative translation adjustments	-64	'	-47
Accumulated other comprehensive income (loss), net of deferred taxes	($12)	($16)	($103)

Supplemental_Financial_Informa4

Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$2,633,000,000	$1,778,000,000	$6,596,000,000	$5,167,000,000
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Depreciation and amortization	1,959,000,000	1,916,000,000	5,929,000,000	5,873,000,000
Share-based compensation	'	'	386,000,000	312,000,000
Noncash interest expense (income), net	'	'	132,000,000	122,000,000
Equity in net (income) losses of investees, net	-33,000,000	130,000,000	-87,000,000	96,000,000
Cash received from investees	'	'	71,000,000	89,000,000
Net (gain) loss on investment activity and other	'	'	-24,000,000	-239,000,000
Deferred income taxes	'	'	358,000,000	-52,000,000
Current and noncurrent receivables, net	'	'	89,000,000	145,000,000
Film and television costs, net	'	'	-471,000,000	408,000,000
Accounts payable and accrued expenses related to trade creditors (cash flow)	'	'	119,000,000	-108,000,000
Other operating assets and liabilities	'	'	-796,000,000	-134,000,000
Net cash provided by operating activities	'	'	12,302,000,000	11,679,000,000
Amortization of film and television costs	'	'	6,727,000,000	5,998,000,000
Additions to film and television costs	'	'	7,198,000,000	5,590,000,000
NBCUniversal Media, LLC [Member]	'	'	'	'
Net income	833,000,000	278,000,000	2,416,000,000	1,319,000,000
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'	'
Depreciation and amortization	371,000,000	352,000,000	1,106,000,000	1,045,000,000
Share-based compensation	'	'	'	7,000,000
Equity in net (income) losses of investees, net	-20,000,000	132,000,000	-49,000,000	105,000,000
Cash received from investees	'	'	50,000,000	73,000,000
Net (gain) loss on investment activity and other	'	'	83,000,000	347,000,000
Deferred income taxes	'	'	52,000,000	-6,000,000
Current and noncurrent receivables, net	'	'	7,000,000	142,000,000
Film and television costs, net	'	'	-483,000,000	368,000,000
Accounts payable and accrued expenses related to trade creditors (cash flow)	'	'	-183,000,000	-262,000,000
Other operating assets and liabilities	'	'	157,000,000	596,000,000
Net cash provided by operating activities	'	'	3,156,000,000	3,734,000,000
Amortization of film and television costs	'	'	6,705,000,000	5,945,000,000
Additions to film and television costs	'	'	$7,188,000,000	$5,577,000,000

Supplemental_Financial_Informa5

Supplemental Financial Information (Cash Payments for Interest and Income Taxes)(Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest	$656	$636	$1,820	$1,768
Income taxes	974	958	2,878	3,180
NBCUniversal Media, LLC [Member]	'	'	'	'
Interest	38	38	294	262
Income taxes	$31	$59	$141	$161

Supplemental_Financial_Informa6

Supplemental Financial Information (Noncash Investing and Financing Activities)(Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Dividends payable, amount	$580,000,000
Dividends payable, amount per share	$0.23
Capital expenditures incurred but not yet paid	847,000,000
Fair Value Equity Securities Settlement	3,200,000,000
NBCUniversal Media, LLC [Member]	'
Capital expenditures incurred but not yet paid	$194,000,000

Financial_Data_by_Business_Seg2

Financial Data by Business Segment (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue	$16,791,000,000	$16,151,000,000	$51,043,000,000	$47,731,000,000
Operating income (loss) before depreciation and amortization	5,704,000,000	5,330,000,000	17,046,000,000	15,789,000,000
Depreciation and amortization	1,959,000,000	1,916,000,000	5,929,000,000	5,873,000,000
Operating income (loss)	3,745,000,000	3,414,000,000	11,117,000,000	9,916,000,000
Capital expenditures	1,950,000,000	1,726,000,000	5,196,000,000	4,593,000,000
Cable segment revenue types as percentage of total cable revenue	100.00%	100.00%	100.00%	100.00%
NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	5,921,000,000	5,851,000,000	18,813,000,000	17,186,000,000
Operating income (loss) before depreciation and amortization	1,416,000,000	1,250,000,000	4,161,000,000	3,394,000,000
Depreciation and amortization	371,000,000	352,000,000	1,106,000,000	1,045,000,000
Operating income (loss)	1,045,000,000	898,000,000	3,055,000,000	2,349,000,000
Capital expenditures	295,000,000	284,000,000	884,000,000	807,000,000
Cable Communications [Member]	'	'	'	'
Revenue	11,041,000,000	10,491,000,000	32,827,000,000	31,175,000,000
Operating income (loss) before depreciation and amortization	4,464,000,000	4,246,000,000	13,428,000,000	12,800,000,000
Depreciation and amortization	1,561,000,000	1,549,000,000	4,749,000,000	4,780,000,000
Operating income (loss)	2,903,000,000	2,697,000,000	8,679,000,000	8,020,000,000
Capital expenditures	1,644,000,000	1,432,000,000	4,282,000,000	3,766,000,000
Cable Networks [Member]	'	'	'	'
Revenue	2,255,000,000	2,239,000,000	7,236,000,000	6,877,000,000
Operating income (loss) before depreciation and amortization	868,000,000	853,000,000	2,677,000,000	2,572,000,000
Depreciation and amortization	189,000,000	183,000,000	558,000,000	549,000,000
Operating income (loss)	679,000,000	670,000,000	2,119,000,000	2,023,000,000
Capital expenditures	11,000,000	19,000,000	30,000,000	67,000,000
Cable Networks [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	2,255,000,000	2,239,000,000	7,236,000,000	6,877,000,000
Operating income (loss) before depreciation and amortization	868,000,000	853,000,000	2,677,000,000	2,572,000,000
Depreciation and amortization	189,000,000	183,000,000	558,000,000	549,000,000
Operating income (loss)	679,000,000	670,000,000	2,119,000,000	2,023,000,000
Capital expenditures	11,000,000	19,000,000	30,000,000	67,000,000
Broadcast Television [Member]	'	'	'	'
Revenue	1,770,000,000	1,644,000,000	6,207,000,000	4,893,000,000
Operating income (loss) before depreciation and amortization	142,000,000	34,000,000	504,000,000	205,000,000
Depreciation and amortization	24,000,000	23,000,000	78,000,000	74,000,000
Operating income (loss)	118,000,000	11,000,000	426,000,000	131,000,000
Capital expenditures	15,000,000	21,000,000	52,000,000	38,000,000
Broadcast Television [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	1,770,000,000	1,644,000,000	6,207,000,000	4,893,000,000
Operating income (loss) before depreciation and amortization	142,000,000	34,000,000	504,000,000	205,000,000
Depreciation and amortization	24,000,000	23,000,000	78,000,000	74,000,000
Operating income (loss)	118,000,000	11,000,000	426,000,000	131,000,000
Capital expenditures	15,000,000	21,000,000	52,000,000	38,000,000
Filmed Entertainment [Member]	'	'	'	'
Revenue	1,186,000,000	1,400,000,000	3,713,000,000	4,004,000,000
Operating income (loss) before depreciation and amortization	151,000,000	189,000,000	634,000,000	291,000,000
Depreciation and amortization	6,000,000	4,000,000	16,000,000	11,000,000
Operating income (loss)	145,000,000	185,000,000	618,000,000	280,000,000
Capital expenditures	4,000,000	1,000,000	8,000,000	4,000,000
Goodwill reclassification	'	'	-195,000,000	'
Filmed Entertainment [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	1,186,000,000	1,400,000,000	3,713,000,000	4,004,000,000
Operating income (loss) before depreciation and amortization	151,000,000	189,000,000	634,000,000	291,000,000
Depreciation and amortization	6,000,000	4,000,000	16,000,000	11,000,000
Operating income (loss)	145,000,000	185,000,000	618,000,000	280,000,000
Capital expenditures	4,000,000	1,000,000	8,000,000	4,000,000
Goodwill reclassification	'	'	-195,000,000	'
Theme Parks [Member]	'	'	'	'
Revenue	786,000,000	661,000,000	1,888,000,000	1,669,000,000
Operating income (loss) before depreciation and amortization	402,000,000	343,000,000	816,000,000	747,000,000
Depreciation and amortization	68,000,000	73,000,000	210,000,000	218,000,000
Operating income (loss)	334,000,000	270,000,000	606,000,000	529,000,000
Capital expenditures	184,000,000	142,000,000	486,000,000	427,000,000
Theme Parks [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	786,000,000	661,000,000	1,888,000,000	1,669,000,000
Operating income (loss) before depreciation and amortization	402,000,000	343,000,000	816,000,000	747,000,000
Depreciation and amortization	68,000,000	73,000,000	210,000,000	218,000,000
Operating income (loss)	334,000,000	270,000,000	606,000,000	529,000,000
Capital expenditures	184,000,000	142,000,000	486,000,000	427,000,000
Headquarters And Other [Member]	'	'	'	'
Revenue	4,000,000	7,000,000	10,000,000	25,000,000
Operating income (loss) before depreciation and amortization	-142,000,000	-167,000,000	-464,000,000	-416,000,000
Depreciation and amortization	84,000,000	69,000,000	244,000,000	193,000,000
Operating income (loss)	-226,000,000	-236,000,000	-708,000,000	-609,000,000
Capital expenditures	81,000,000	101,000,000	308,000,000	271,000,000
Headquarters And Other [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	4,000,000	7,000,000	10,000,000	25,000,000
Operating income (loss) before depreciation and amortization	-142,000,000	-167,000,000	-464,000,000	-416,000,000
Depreciation and amortization	84,000,000	69,000,000	244,000,000	193,000,000
Operating income (loss)	-226,000,000	-236,000,000	-708,000,000	-609,000,000
Capital expenditures	81,000,000	101,000,000	308,000,000	271,000,000
NBCUniversal Eliminations [Member]	'	'	'	'
Revenue	-80,000,000	-100,000,000	-241,000,000	-282,000,000
Operating income (loss) before depreciation and amortization	-5,000,000	-2,000,000	-6,000,000	-5,000,000
Depreciation and amortization	0	0	0	0
Operating income (loss)	-5,000,000	-2,000,000	-6,000,000	-5,000,000
Capital expenditures	0	0	0	0
NBCUniversal Eliminations [Member] | NBCUniversal Media, LLC [Member]	'	'	'	'
Revenue	-80,000,000	-100,000,000	-241,000,000	-282,000,000
Operating income (loss) before depreciation and amortization	-5,000,000	-2,000,000	-6,000,000	-5,000,000
Depreciation and amortization	0	0	0	0
Operating income (loss)	-5,000,000	-2,000,000	-6,000,000	-5,000,000
Capital expenditures	0	0	0	0
NBCUniversal [Member]	'	'	'	'
Revenue	5,921,000,000	5,851,000,000	18,813,000,000	17,186,000,000
Operating income (loss) before depreciation and amortization	1,416,000,000	1,250,000,000	4,161,000,000	3,394,000,000
Depreciation and amortization	371,000,000	352,000,000	1,106,000,000	1,045,000,000
Operating income (loss)	1,045,000,000	898,000,000	3,055,000,000	2,349,000,000
Capital expenditures	295,000,000	284,000,000	884,000,000	807,000,000
Corporate and Other [Member]	'	'	'	'
Revenue	174,000,000	133,000,000	520,000,000	431,000,000
Operating income (loss) before depreciation and amortization	-197,000,000	-178,000,000	-532,000,000	-380,000,000
Depreciation and amortization	27,000,000	16,000,000	74,000,000	48,000,000
Operating income (loss)	-224,000,000	-194,000,000	-606,000,000	-428,000,000
Capital expenditures	11,000,000	10,000,000	30,000,000	20,000,000
Eliminations [Member]	'	'	'	'
Revenue	-345,000,000	-324,000,000	-1,117,000,000	-1,061,000,000
Operating income (loss) before depreciation and amortization	21,000,000	12,000,000	-11,000,000	-25,000,000
Depreciation and amortization	0	-1,000,000	0	0
Operating income (loss)	21,000,000	13,000,000	-11,000,000	-25,000,000
Capital expenditures	$0	$0	$0	$0
Cable Communications Segment Revenue Percentage-Video [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	46.90%	48.90%	47.50%	49.40%
Cable Communications Segment Revenue Percentage - High-speed Internet [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	25.70%	24.70%	25.60%	24.60%
Cable Communications Segment Revenue Percentage- Voice [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	8.30%	8.80%	8.40%	8.80%
Cable Communications Segment Revenue Percentage- Business Services [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	9.20%	8.00%	8.80%	7.60%
Cable Communications Segment Revenue Percentage- Advertising [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	5.50%	5.20%	5.30%	5.10%
Cable Communications Segment Revenue Percentage- Other [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	4.40%	4.40%	4.40%	4.50%
Cable Communications Segment Revenue Percentage- Franchise and other regulatory fees [Member]	'	'	'	'
Cable segment revenue types as percentage of total cable revenue	2.80%	2.90%	2.80%	2.90%

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information (Narrative) (Details) (USD $)	Sep. 30, 2014
Comcast Holdings' ZONES due October 2029 [Member]	'
Principal amount of debt securities subject to guarantee	$185,000,000
Comcast Holdings' ZONES due November 2029 [Member]	'
Principal amount of debt securities not subject to guarantee	62,000,000
NBCUniversal Enterprise Credit Facility [Member]	'
Credit facility borrowing capacity	1,350,000,000
NBCUniversal Enterprise [Member]	'
Principal amount of debt securities subject to guarantee	$4,000,000,000

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Cash and cash equivalents	$4,547,000,000	$1,718,000,000	$1,603,000,000	$10,951,000,000
Investments [Current]	531,000,000	3,573,000,000	'	'
Receivables, net	6,172,000,000	6,376,000,000	'	'
Programming rights	992,000,000	928,000,000	'	'
Other current assets	1,694,000,000	1,480,000,000	'	'
Total current assets	13,936,000,000	14,075,000,000	'	'
Film and television costs	5,560,000,000	4,994,000,000	'	'
Investments	3,129,000,000	3,770,000,000	'	'
Property and equipment, net	30,362,000,000	29,840,000,000	'	'
Franchise rights	59,364,000,000	59,364,000,000	'	'
Goodwill	27,323,000,000	27,098,000,000	'	'
Other intangible assets, net	17,089,000,000	17,329,000,000	'	'
Other noncurrent assets, net	2,474,000,000	2,343,000,000	'	'
Total assets	159,237,000,000	158,813,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	5,680,000,000	5,528,000,000	'	'
Accrued participations and residuals	1,444,000,000	1,239,000,000	'	'
Accrued expenses and other current liabilities [condensed]	6,437,000,000	8,865,000,000	'	'
Current portion of long-term debt	3,523,000,000	3,280,000,000	'	'
Total current liabilities	17,084,000,000	18,912,000,000	'	'
Long-term debt, less current portion	44,827,000,000	44,567,000,000	'	'
Deferred income taxes	32,227,000,000	31,935,000,000	'	'
Other noncurrent liabilities	10,388,000,000	11,384,000,000	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,058,000,000	957,000,000	'	'
Common stock	30,000,000	30,000,000	'	'
Other shareholders' equity	53,268,000,000	50,664,000,000	'	'
Total Comcast Corporation shareholders' equity	53,298,000,000	50,694,000,000	'	'
Noncontrolling interests	355,000,000	364,000,000	'	'
Total equity	53,653,000,000	51,058,000,000	50,134,000,000	49,796,000,000
Total liabilities and equity	159,237,000,000	158,813,000,000	'	'
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	222,000,000	237,000,000	'	'
Total current assets	222,000,000	237,000,000	'	'
Film and television costs	0	0	'	'
Investments	21,000,000	11,000,000	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	84,503,000,000	79,956,000,000	'	'
Property and equipment, net	202,000,000	220,000,000	'	'
Franchise rights	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	9,000,000	11,000,000	'	'
Other noncurrent assets, net	1,187,000,000	1,078,000,000	'	'
Total assets	86,144,000,000	81,513,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	11,000,000	8,000,000	'	'
Accrued participations and residuals	0	0	'	'
Accrued expenses and other current liabilities [condensed]	1,374,000,000	1,371,000,000	'	'
Current portion of long-term debt	900,000,000	2,351,000,000	'	'
Total current liabilities	2,285,000,000	3,730,000,000	'	'
Long-term debt, less current portion	28,401,000,000	25,170,000,000	'	'
Deferred income taxes	0	0	'	'
Other noncurrent liabilities	2,160,000,000	1,919,000,000	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0	'	'
Common stock	30,000,000	30,000,000	'	'
Other shareholders' equity	53,268,000,000	50,664,000,000	'	'
Total Comcast Corporation shareholders' equity	53,298,000,000	50,694,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	53,298,000,000	50,694,000,000	'	'
Total liabilities and equity	86,144,000,000	81,513,000,000	'	'
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	103,462,000,000	97,429,000,000	'	'
Property and equipment, net	0	0	'	'
Franchise rights	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Other noncurrent assets, net	148,000,000	145,000,000	'	'
Total assets	103,610,000,000	97,574,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	0	0	'	'
Accrued participations and residuals	0	0	'	'
Accrued expenses and other current liabilities [condensed]	283,000,000	266,000,000	'	'
Current portion of long-term debt	0	0	'	'
Total current liabilities	283,000,000	266,000,000	'	'
Long-term debt, less current portion	131,000,000	132,000,000	'	'
Deferred income taxes	719,000,000	777,000,000	'	'
Other noncurrent liabilities	0	0	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0	'	'
Common stock	0	0	'	'
Other shareholders' equity	102,477,000,000	96,399,000,000	'	'
Total Comcast Corporation shareholders' equity	102,477,000,000	96,399,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	102,477,000,000	96,399,000,000	'	'
Total liabilities and equity	103,610,000,000	97,574,000,000	'	'
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	110,327,000,000	102,673,000,000	'	'
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	110,327,000,000	102,673,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	0	0	'	'
Accrued participations and residuals	0	0	'	'
Accrued expenses and other current liabilities [condensed]	347,000,000	180,000,000	'	'
Current portion of long-term debt	0	0	'	'
Total current liabilities	347,000,000	180,000,000	'	'
Long-term debt, less current portion	1,827,000,000	1,827,000,000	'	'
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	108,153,000,000	100,666,000,000	'	'
Total Comcast Corporation shareholders' equity	108,153,000,000	100,666,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	108,153,000,000	100,666,000,000	'	'
Total liabilities and equity	110,327,000,000	102,673,000,000	'	'
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	59,160,000,000	54,724,000,000	'	'
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	59,160,000,000	54,724,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	0	0	'	'
Accrued participations and residuals	0	0	'	'
Accrued expenses and other current liabilities [condensed]	21,000,000	47,000,000	'	'
Current portion of long-term debt	679,000,000	0	'	'
Total current liabilities	700,000,000	47,000,000	'	'
Long-term debt, less current portion	822,000,000	1,505,000,000	'	'
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	57,638,000,000	53,172,000,000	'	'
Total Comcast Corporation shareholders' equity	57,638,000,000	53,172,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	57,638,000,000	53,172,000,000	'	'
Total liabilities and equity	59,160,000,000	54,724,000,000	'	'
NBCUniversal Media Parent [Member]	'	'	'	'
Cash and cash equivalents	196,000,000	336,000,000	240,000,000	5,129,000,000
Investments [Current]	5,000,000	0	'	'
Receivables, net	0	0	'	'
Programming rights	0	0	'	'
Other current assets	43,000,000	35,000,000	'	'
Total current assets	244,000,000	371,000,000	'	'
Film and television costs	0	0	'	'
Investments	373,000,000	374,000,000	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	41,038,000,000	40,644,000,000	'	'
Property and equipment, net	0	0	'	'
Franchise rights	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Other noncurrent assets, net	94,000,000	103,000,000	'	'
Total assets	41,749,000,000	41,492,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	0	0	'	'
Accrued participations and residuals	0	0	'	'
Accrued expenses and other current liabilities [condensed]	415,000,000	323,000,000	'	'
Current portion of long-term debt	1,008,000,000	903,000,000	'	'
Total current liabilities	1,423,000,000	1,226,000,000	'	'
Long-term debt, less current portion	9,219,000,000	10,236,000,000	'	'
Deferred income taxes	59,000,000	59,000,000	'	'
Other noncurrent liabilities	945,000,000	931,000,000	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0	'	'
Common stock	0	0	'	'
Other shareholders' equity	30,103,000,000	29,040,000,000	'	'
Total Comcast Corporation shareholders' equity	30,103,000,000	29,040,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	30,103,000,000	29,040,000,000	'	'
Total liabilities and equity	41,749,000,000	41,492,000,000	'	'
Comcast Non-Guarantor Subsidiaries [Member]	'	'	'	'
Cash and cash equivalents	4,351,000,000	1,382,000,000	1,363,000,000	5,822,000,000
Investments [Current]	526,000,000	3,573,000,000	'	'
Receivables, net	6,172,000,000	6,376,000,000	'	'
Programming rights	992,000,000	928,000,000	'	'
Other current assets	1,429,000,000	1,208,000,000	'	'
Total current assets	13,470,000,000	13,467,000,000	'	'
Film and television costs	5,560,000,000	4,994,000,000	'	'
Investments	2,735,000,000	3,385,000,000	'	'
Investments in and amounts due from subsidiaries eliminated upon consolidation	95,665,000,000	85,164,000,000	'	'
Property and equipment, net	30,160,000,000	29,620,000,000	'	'
Franchise rights	59,364,000,000	59,364,000,000	'	'
Goodwill	27,323,000,000	27,098,000,000	'	'
Other intangible assets, net	17,080,000,000	17,318,000,000	'	'
Other noncurrent assets, net	2,059,000,000	1,899,000,000	'	'
Total assets	253,416,000,000	242,309,000,000	'	'
Accounts payable and accrued expenses related to trade creditors	5,669,000,000	5,520,000,000	'	'
Accrued participations and residuals	1,444,000,000	1,239,000,000	'	'
Accrued expenses and other current liabilities [condensed]	3,997,000,000	6,678,000,000	'	'
Current portion of long-term debt	936,000,000	26,000,000	'	'
Total current liabilities	12,046,000,000	13,463,000,000	'	'
Long-term debt, less current portion	4,427,000,000	5,697,000,000	'	'
Deferred income taxes	32,319,000,000	31,840,000,000	'	'
Other noncurrent liabilities	7,427,000,000	8,675,000,000	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	1,058,000,000	957,000,000	'	'
Common stock	0	0	'	'
Other shareholders' equity	195,784,000,000	181,313,000,000	'	'
Total Comcast Corporation shareholders' equity	195,784,000,000	181,313,000,000	'	'
Noncontrolling interests	355,000,000	364,000,000	'	'
Total equity	196,139,000,000	181,677,000,000	'	'
Total liabilities and equity	253,416,000,000	242,309,000,000	'	'
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	-494,155,000,000	-460,590,000,000	'	'
Property and equipment, net	0	0	'	'
Franchise rights	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Other noncurrent assets, net	-1,014,000,000	-882,000,000	'	'
Total assets	-495,169,000,000	-461,472,000,000	'	'
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	-870,000,000	-741,000,000	'	'
Other noncurrent liabilities	-144,000,000	-141,000,000	'	'
Redeemable noncontrolling interests and redeemable subsidiary preferred stock	0	0	'	'
Common stock	0	0	'	'
Other shareholders' equity	-494,155,000,000	-460,590,000,000	'	'
Total Comcast Corporation shareholders' equity	-494,155,000,000	-460,590,000,000	'	'
Noncontrolling interests	0	0	'	'
Total equity	-494,155,000,000	-460,590,000,000	'	'
Total liabilities and equity	($495,169,000,000)	($461,472,000,000)	'	'

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Service revenue	$16,791,000,000	$16,151,000,000	$51,043,000,000	$47,731,000,000
Management fee revenue	'	'	'	0
Revenue	16,791,000,000	16,151,000,000	51,043,000,000	47,731,000,000
Programming and production	4,772,000,000	4,787,000,000	15,554,000,000	14,418,000,000
Other operating and administrative	5,019,000,000	4,751,000,000	14,695,000,000	13,787,000,000
Advertising, marketing and promotion	1,296,000,000	1,283,000,000	3,748,000,000	3,737,000,000
Depreciation	1,539,000,000	1,520,000,000	4,707,000,000	4,669,000,000
Amortization	420,000,000	396,000,000	1,222,000,000	1,204,000,000
Costs and expenses, total	13,046,000,000	12,737,000,000	39,926,000,000	37,815,000,000
Operating income (loss)	3,745,000,000	3,414,000,000	11,117,000,000	9,916,000,000
Interest expense	-663,000,000	-639,000,000	-1,953,000,000	-1,928,000,000
Investment income (loss), net	21,000,000	464,000,000	254,000,000	549,000,000
Equity in net income (losses) of investees, net	33,000,000	-130,000,000	87,000,000	-96,000,000
Other income (expense), net	-96,000,000	-310,000,000	-150,000,000	-280,000,000
Nonoperating income (Expense), Total	-705,000,000	-615,000,000	-1,762,000,000	-1,755,000,000
Income (loss) before income taxes	3,040,000,000	2,799,000,000	9,355,000,000	8,161,000,000
Income tax (expense) benefit	-407,000,000	-1,021,000,000	-2,759,000,000	-2,994,000,000
Net income (loss)	2,633,000,000	1,778,000,000	6,596,000,000	5,167,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-41,000,000	-46,000,000	-141,000,000	-264,000,000
Net income (loss) attributable to Parent	2,592,000,000	1,732,000,000	6,455,000,000	4,903,000,000
Comprehensive income attributable to Parent	2,609,000,000	1,545,000,000	6,402,000,000	4,804,000,000
Comcast Parent [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	237,000,000	225,000,000	704,000,000	668,000,000
Revenue	237,000,000	225,000,000	704,000,000	668,000,000
Programming and production	0	0	0	0
Other operating and administrative	197,000,000	92,000,000	471,000,000	291,000,000
Advertising, marketing and promotion	0	0	0	0
Depreciation	10,000,000	7,000,000	25,000,000	22,000,000
Amortization	1,000,000	1,000,000	4,000,000	4,000,000
Costs and expenses, total	208,000,000	100,000,000	500,000,000	317,000,000
Operating income (loss)	29,000,000	125,000,000	204,000,000	351,000,000
Interest expense	-412,000,000	-382,000,000	-1,199,000,000	-1,141,000,000
Investment income (loss), net	1,000,000	1,000,000	3,000,000	3,000,000
Equity in net income (losses) of investees, net	2,840,000,000	1,898,000,000	7,100,000,000	5,416,000,000
Other income (expense), net	0	0	0	-2,000,000
Nonoperating income (Expense), Total	2,429,000,000	1,517,000,000	5,904,000,000	4,276,000,000
Income (loss) before income taxes	2,458,000,000	1,642,000,000	6,108,000,000	4,627,000,000
Income tax (expense) benefit	134,000,000	90,000,000	347,000,000	276,000,000
Net income (loss)	2,592,000,000	1,732,000,000	6,455,000,000	4,903,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	2,592,000,000	1,732,000,000	6,455,000,000	4,903,000,000
Comprehensive income attributable to Parent	2,609,000,000	1,545,000,000	6,402,000,000	4,804,000,000
Comcast Holdings [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	0	0	0	0
Revenue	0	0	0	0
Programming and production	0	0	0	0
Other operating and administrative	0	0	0	0
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Costs and expenses, total	0	0	0	0
Operating income (loss)	0	0	0	0
Interest expense	-2,000,000	-3,000,000	-8,000,000	-8,000,000
Investment income (loss), net	2,000,000	-5,000,000	5,000,000	-2,000,000
Equity in net income (losses) of investees, net	2,556,000,000	1,787,000,000	6,731,000,000	5,438,000,000
Other income (expense), net	0	0	0	0
Nonoperating income (Expense), Total	2,556,000,000	1,779,000,000	6,728,000,000	5,428,000,000
Income (loss) before income taxes	2,556,000,000	1,779,000,000	6,728,000,000	5,428,000,000
Income tax (expense) benefit	0	3,000,000	1,000,000	4,000,000
Net income (loss)	2,556,000,000	1,782,000,000	6,729,000,000	5,432,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	2,556,000,000	1,782,000,000	6,729,000,000	5,432,000,000
Comprehensive income attributable to Parent	2,551,000,000	1,828,000,000	6,732,000,000	5,471,000,000
CCCL Parent [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	237,000,000	219,000,000	691,000,000	650,000,000
Revenue	237,000,000	219,000,000	691,000,000	650,000,000
Programming and production	0	0	0	0
Other operating and administrative	237,000,000	219,000,000	691,000,000	650,000,000
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Costs and expenses, total	237,000,000	219,000,000	691,000,000	650,000,000
Operating income (loss)	0	0	0	0
Interest expense	-43,000,000	-45,000,000	-132,000,000	-169,000,000
Investment income (loss), net	0	0	0	0
Equity in net income (losses) of investees, net	2,362,000,000	1,850,000,000	6,301,000,000	5,448,000,000
Other income (expense), net	0	0	0	2,000,000
Nonoperating income (Expense), Total	2,319,000,000	1,805,000,000	6,169,000,000	5,281,000,000
Income (loss) before income taxes	2,319,000,000	1,805,000,000	6,169,000,000	5,281,000,000
Income tax (expense) benefit	15,000,000	15,000,000	46,000,000	58,000,000
Net income (loss)	2,334,000,000	1,820,000,000	6,215,000,000	5,339,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	2,334,000,000	1,820,000,000	6,215,000,000	5,339,000,000
Comprehensive income attributable to Parent	2,335,000,000	1,864,000,000	6,217,000,000	5,386,000,000
Combined CCHMO Parents [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	146,000,000	137,000,000	432,000,000	407,000,000
Revenue	146,000,000	137,000,000	432,000,000	407,000,000
Programming and production	0	0	0	0
Other operating and administrative	146,000,000	137,000,000	432,000,000	407,000,000
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Costs and expenses, total	146,000,000	137,000,000	432,000,000	407,000,000
Operating income (loss)	0	0	0	0
Interest expense	-29,000,000	-30,000,000	-88,000,000	-96,000,000
Investment income (loss), net	0	0	0	0
Equity in net income (losses) of investees, net	1,801,000,000	1,371,000,000	4,866,000,000	3,982,000,000
Other income (expense), net	0	0	0	0
Nonoperating income (Expense), Total	1,772,000,000	1,341,000,000	4,778,000,000	3,886,000,000
Income (loss) before income taxes	1,772,000,000	1,341,000,000	4,778,000,000	3,886,000,000
Income tax (expense) benefit	10,000,000	11,000,000	31,000,000	34,000,000
Net income (loss)	1,782,000,000	1,352,000,000	4,809,000,000	3,920,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	1,782,000,000	1,352,000,000	4,809,000,000	3,920,000,000
Comprehensive income attributable to Parent	1,781,000,000	1,415,000,000	4,809,000,000	3,983,000,000
NBCUniversal Media Parent [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	0	0	0	0
Revenue	0	0	0	0
Programming and production	0	0	0	0
Other operating and administrative	203,000,000	211,000,000	697,000,000	641,000,000
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Costs and expenses, total	203,000,000	211,000,000	697,000,000	641,000,000
Operating income (loss)	-203,000,000	-211,000,000	-697,000,000	-641,000,000
Interest expense	-111,000,000	-123,000,000	-360,000,000	-366,000,000
Investment income (loss), net	-14,000,000	-3,000,000	-9,000,000	-2,000,000
Equity in net income (losses) of investees, net	1,144,000,000	576,000,000	3,386,000,000	2,236,000,000
Other income (expense), net	-3,000,000	0	0	0
Nonoperating income (Expense), Total	1,016,000,000	450,000,000	3,017,000,000	1,868,000,000
Income (loss) before income taxes	813,000,000	239,000,000	2,320,000,000	1,227,000,000
Income tax (expense) benefit	-11,000,000	-3,000,000	-22,000,000	-13,000,000
Net income (loss)	802,000,000	236,000,000	2,298,000,000	1,214,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	802,000,000	236,000,000	2,298,000,000	1,214,000,000
Comprehensive income attributable to Parent	785,000,000	244,000,000	2,302,000,000	1,176,000,000
Comcast Non-Guarantor Subsidiaries [Member]	'	'	'	'
Service revenue	16,791,000,000	16,151,000,000	51,043,000,000	47,731,000,000
Management fee revenue	0	0	0	0
Revenue	16,791,000,000	16,151,000,000	51,043,000,000	47,731,000,000
Programming and production	4,772,000,000	4,787,000,000	15,554,000,000	14,418,000,000
Other operating and administrative	4,856,000,000	4,673,000,000	14,231,000,000	13,523,000,000
Advertising, marketing and promotion	1,296,000,000	1,283,000,000	3,748,000,000	3,737,000,000
Depreciation	1,529,000,000	1,513,000,000	4,682,000,000	4,647,000,000
Amortization	419,000,000	395,000,000	1,218,000,000	1,200,000,000
Costs and expenses, total	12,872,000,000	12,651,000,000	39,433,000,000	37,525,000,000
Operating income (loss)	3,919,000,000	3,500,000,000	11,610,000,000	10,206,000,000
Interest expense	-66,000,000	-56,000,000	-166,000,000	-148,000,000
Investment income (loss), net	32,000,000	471,000,000	255,000,000	550,000,000
Equity in net income (losses) of investees, net	835,000,000	106,000,000	2,385,000,000	1,118,000,000
Other income (expense), net	-93,000,000	-310,000,000	-150,000,000	-280,000,000
Nonoperating income (Expense), Total	708,000,000	211,000,000	2,324,000,000	1,240,000,000
Income (loss) before income taxes	4,627,000,000	3,711,000,000	13,934,000,000	11,446,000,000
Income tax (expense) benefit	-555,000,000	-1,137,000,000	-3,162,000,000	-3,353,000,000
Net income (loss)	4,072,000,000	2,574,000,000	10,772,000,000	8,093,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	-41,000,000	-46,000,000	-141,000,000	-264,000,000
Net income (loss) attributable to Parent	4,031,000,000	2,528,000,000	10,631,000,000	7,829,000,000
Comprehensive income attributable to Parent	4,031,000,000	2,327,000,000	10,566,000,000	7,741,000,000
Elimination and Consolidation Adjustments [Member]	'	'	'	'
Service revenue	0	0	0	0
Management fee revenue	-620,000,000	-581,000,000	-1,827,000,000	-1,725,000,000
Revenue	-620,000,000	-581,000,000	-1,827,000,000	-1,725,000,000
Programming and production	0	0	0	0
Other operating and administrative	-620,000,000	-581,000,000	-1,827,000,000	-1,725,000,000
Advertising, marketing and promotion	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
Costs and expenses, total	-620,000,000	-581,000,000	-1,827,000,000	-1,725,000,000
Operating income (loss)	0	0	0	0
Interest expense	0	0	0	0
Investment income (loss), net	0	0	0	0
Equity in net income (losses) of investees, net	-11,505,000,000	-7,718,000,000	-30,682,000,000	-23,734,000,000
Other income (expense), net	0	0	0	0
Nonoperating income (Expense), Total	-11,505,000,000	-7,718,000,000	-30,682,000,000	-23,734,000,000
Income (loss) before income taxes	-11,505,000,000	-7,718,000,000	-30,682,000,000	-23,734,000,000
Income tax (expense) benefit	0	0	0	0
Net income (loss)	-11,505,000,000	-7,718,000,000	-30,682,000,000	-23,734,000,000
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock	0	0	0	0
Net income (loss) attributable to Parent	-11,505,000,000	-7,718,000,000	-30,682,000,000	-23,734,000,000
Comprehensive income attributable to Parent	($11,483,000,000)	($7,678,000,000)	($30,626,000,000)	($23,757,000,000)

Condensed_Consolidating_Financ5

Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net cash provided by (used in) operating activities	$12,302,000,000	$11,679,000,000
Investing Activities	'	'
Net transactions with affiliates	0	0
Capital expenditures	-5,196,000,000	-4,593,000,000
Cash paid for intangible assets	-735,000,000	-694,000,000
Acquisitions and construction of real estate properties	-28,000,000	-1,705,000,000
Acquisitions, net of cash acquired	-477,000,000	-42,000,000
Proceeds from sales of businesses and investments	622,000,000	655,000,000
Return of capital from investees	6,000,000	146,000,000
Purchases of investments	-145,000,000	-1,177,000,000
Other	-127,000,000	83,000,000
Net cash provided by (used in) investing activities	-6,080,000,000	-7,327,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-437,000,000	395,000,000
Proceeds from borrowings	4,182,000,000	2,933,000,000
Repurchases and repayments of debt	-3,172,000,000	-2,442,000,000
Repurchases and retirements of common stock	-2,250,000,000	-1,500,000,000
Dividends paid	-1,676,000,000	-1,454,000,000
Issuances of common stock	33,000,000	35,000,000
Purchase of NBCUniversal noncontrolling common equity interest	'	-10,761,000,000
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-170,000,000	-164,000,000
Settlement of Station Venture liability	'	-602,000,000
Other	97,000,000	-140,000,000
Net cash provided by (used in) financing activities	-3,393,000,000	-13,700,000,000
Increase (decrease) in cash and cash equivalents	2,829,000,000	-9,348,000,000
Cash and cash equivalents, beginning of period	1,718,000,000	10,951,000,000
Cash and cash equivalents, end of period	4,547,000,000	1,603,000,000
Comcast Parent [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	-433,000,000	-451,000,000
Investing Activities	'	'
Net transactions with affiliates	2,349,000,000	-116,000,000
Capital expenditures	-3,000,000	-3,000,000
Cash paid for intangible assets	-2,000,000	-1,000,000
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	0	0
Return of capital from investees	0	0
Purchases of investments	-10,000,000	-8,000,000
Other	0	0
Net cash provided by (used in) investing activities	2,334,000,000	-128,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	-1,350,000,000	400,000,000
Proceeds from borrowings	4,180,000,000	2,933,000,000
Repurchases and repayments of debt	-1,000,000,000	0
Repurchases and retirements of common stock	-2,250,000,000	-1,500,000,000
Dividends paid	-1,676,000,000	-1,454,000,000
Issuances of common stock	33,000,000	35,000,000
Purchase of NBCUniversal noncontrolling common equity interest	'	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	0
Other	162,000,000	165,000,000
Net cash provided by (used in) financing activities	-1,901,000,000	579,000,000
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	11,000,000	-7,000,000
Investing Activities	'	'
Net transactions with affiliates	-11,000,000	7,000,000
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	0	0
Return of capital from investees	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	-11,000,000	7,000,000
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
Purchase of NBCUniversal noncontrolling common equity interest	'	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	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	84,000,000	-3,000,000
Investing Activities	'	'
Net transactions with affiliates	-84,000,000	2,100,000,000
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	0	0
Return of capital from investees	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	-84,000,000	2,100,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	-2,097,000,000
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Purchase of NBCUniversal noncontrolling common equity interest	'	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	0
Other	0	0
Net cash provided by (used in) financing activities	0	-2,097,000,000
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	-88,000,000	-99,000,000
Investing Activities	'	'
Net transactions with affiliates	88,000,000	337,000,000
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	0	0
Return of capital from investees	0	0
Purchases of investments	0	0
Other	0	0
Net cash provided by (used in) investing activities	88,000,000	337,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	0	-238,000,000
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Purchase of NBCUniversal noncontrolling common equity interest	'	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	0
Other	0	0
Net cash provided by (used in) financing activities	0	-238,000,000
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	-998,000,000	-767,000,000
Investing Activities	'	'
Net transactions with affiliates	1,761,000,000	-900,000,000
Capital expenditures	0	0
Cash paid for intangible assets	0	0
Acquisitions and construction of real estate properties	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	1,000,000	0
Return of capital from investees	0	128,000,000
Purchases of investments	-6,000,000	-2,000,000
Other	4,000,000	-20,000,000
Net cash provided by (used in) investing activities	1,760,000,000	-794,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	0	0
Proceeds from borrowings	0	0
Repurchases and repayments of debt	-902,000,000	-88,000,000
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Purchase of NBCUniversal noncontrolling common equity interest	'	-3,200,000,000
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	0
Other	0	-40,000,000
Net cash provided by (used in) financing activities	-902,000,000	-3,328,000,000
Increase (decrease) in cash and cash equivalents	-140,000,000	-4,889,000,000
Cash and cash equivalents, beginning of period	336,000,000	5,129,000,000
Cash and cash equivalents, end of period	196,000,000	240,000,000
Comcast Non-Guarantor Subsidiaries [Member]	'	'
Operating Activities	'	'
Net cash provided by (used in) operating activities	13,726,000,000	13,006,000,000
Investing Activities	'	'
Net transactions with affiliates	-4,103,000,000	-1,428,000,000
Capital expenditures	-5,193,000,000	-4,590,000,000
Cash paid for intangible assets	-733,000,000	-693,000,000
Acquisitions and construction of real estate properties	-28,000,000	-1,705,000,000
Acquisitions, net of cash acquired	-477,000,000	-42,000,000
Proceeds from sales of businesses and investments	621,000,000	655,000,000
Return of capital from investees	6,000,000	18,000,000
Purchases of investments	-129,000,000	-1,167,000,000
Other	-131,000,000	103,000,000
Net cash provided by (used in) investing activities	-10,167,000,000	-8,849,000,000
Financing Activities	'	'
Proceeds from (repayments of) short-term borrowings, net	913,000,000	-5,000,000
Proceeds from borrowings	2,000,000	0
Repurchases and repayments of debt	-1,270,000,000	-19,000,000
Repurchases and retirements of common stock	0	0
Dividends paid	0	0
Issuances of common stock	0	0
Purchase of NBCUniversal noncontrolling common equity interest	'	-7,561,000,000
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	-170,000,000	-164,000,000
Settlement of Station Venture liability	'	-602,000,000
Other	-65,000,000	-265,000,000
Net cash provided by (used in) financing activities	-590,000,000	-8,616,000,000
Increase (decrease) in cash and cash equivalents	2,969,000,000	-4,459,000,000
Cash and cash equivalents, beginning of period	1,382,000,000	5,822,000,000
Cash and cash equivalents, end of period	4,351,000,000	1,363,000,000
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
Acquisitions, net of cash acquired	0	0
Proceeds from sales of businesses and investments	0	0
Return of capital from investees	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
Purchase of NBCUniversal noncontrolling common equity interest	'	0
Distributions to noncontrolling interests and dividends for redeemable subsidiary preferred stock	0	0
Settlement of Station Venture liability	'	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