v2.4.0.8
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)