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)

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The total amount of participations, residual and royalty expenses due to another party in less than one year. Royalty expenses are due to content creators, including artists, authors and other talent; participations includes amounts to financial participants in films, including actors, directors, and producers, for contractually defined participations in a film's net profit or gross receipts; residuals include amounts due to unions and guilds.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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