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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Sep. 30, 2014
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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 |
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Comcast Parent [Member]
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| 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 |
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Comcast Holdings [Member]
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| 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 |
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CCCL Parent [Member]
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| 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 |
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Combined CCHMO Parents [Member]
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| 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 |
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NBCUniversal Media Parent [Member]
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| 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 |
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Comcast Non-Guarantor Subsidiaries [Member]
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| 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 |
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Elimination and Consolidation Adjustments [Member]
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| 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) |