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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Service revenue | $ 16,844,000,000 | $ 16,270,000,000 | $ 34,252,000,000 | $ 31,580,000,000 |
| Revenue | 16,844,000,000 | 16,270,000,000 | 34,252,000,000 | 31,580,000,000 |
| Programming and production | 4,874,000,000 | 4,968,000,000 | 10,782,000,000 | 9,631,000,000 |
| Other operating and administrative | 4,924,000,000 | 4,570,000,000 | 9,676,000,000 | 9,036,000,000 |
| Advertising, marketing and promotion | 1,242,000,000 | 1,307,000,000 | 2,452,000,000 | 2,454,000,000 |
| Depreciation | 1,599,000,000 | 1,583,000,000 | 3,168,000,000 | 3,149,000,000 |
| Amortization | 401,000,000 | 407,000,000 | 802,000,000 | 808,000,000 |
| Costs and expenses, total | 13,040,000,000 | 12,835,000,000 | 26,880,000,000 | 25,078,000,000 |
| Operating income (loss) | 3,804,000,000 | 3,435,000,000 | 7,372,000,000 | 6,502,000,000 |
| Interest expense | (648,000,000) | (636,000,000) | (1,290,000,000) | (1,289,000,000) |
| Investment income (loss), net | 120,000,000 | 13,000,000 | 233,000,000 | 85,000,000 |
| Equity in net income (losses) of investees, net | 22,000,000 | 23,000,000 | 54,000,000 | 34,000,000 |
| Other income (expense), net | (39,000,000) | (43,000,000) | (54,000,000) | 30,000,000 |
| Nonoperating income (Expense), Total | (545,000,000) | (643,000,000) | (1,057,000,000) | (1,140,000,000) |
| Income (loss) before income taxes | 3,259,000,000 | 2,792,000,000 | 6,315,000,000 | 5,362,000,000 |
| Income tax (expense) benefit | (1,234,000,000) | (1,048,000,000) | (2,352,000,000) | (1,973,000,000) |
| Net income (loss) | 2,025,000,000 | 1,744,000,000 | 3,963,000,000 | 3,389,000,000 |
| Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock | (33,000,000) | (10,000,000) | (100,000,000) | (218,000,000) |
| Net income (loss) attributable to Parent | 1,992,000,000 | 1,734,000,000 | 3,863,000,000 | 3,171,000,000 |
| Comprehensive income attributable to Parent | 1,945,000,000 | 1,822,000,000 | 3,793,000,000 | 3,259,000,000 |
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Comcast [Member]
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| Management fee revenue | 237,000,000 | 225,000,000 | 467,000,000 | 443,000,000 |
| Revenue | 237,000,000 | 225,000,000 | 467,000,000 | 443,000,000 |
| Other operating and administrative | 181,000,000 | 101,000,000 | 274,000,000 | 199,000,000 |
| Depreciation | 8,000,000 | 8,000,000 | 15,000,000 | 15,000,000 |
| Amortization | 2,000,000 | 2,000,000 | 3,000,000 | 3,000,000 |
| Costs and expenses, total | 191,000,000 | 111,000,000 | 292,000,000 | 217,000,000 |
| Operating income (loss) | 46,000,000 | 114,000,000 | 175,000,000 | 226,000,000 |
| Interest expense | (400,000,000) | (383,000,000) | 787,000,000 | (759,000,000) |
| Investment income (loss), net | 1,000,000 | 1,000,000 | 2,000,000 | 2,000,000 |
| Equity in net income (losses) of investees, net | 2,222,000,000 | 1,910,000,000 | 4,260,000,000 | 3,518,000,000 |
| Other income (expense), net | (1,000,000) | (2,000,000) | ||
| Nonoperating income (Expense), Total | 1,823,000,000 | 1,527,000,000 | 3,475,000,000 | 2,759,000,000 |
| Income (loss) before income taxes | 1,869,000,000 | 1,641,000,000 | 3,650,000,000 | 2,985,000,000 |
| Income tax (expense) benefit | 123,000,000 | 93,000,000 | 213,000,000 | 186,000,000 |
| Net income (loss) | 1,992,000,000 | 1,734,000,000 | 3,863,000,000 | 3,171,000,000 |
| Net income (loss) attributable to Parent | 1,992,000,000 | 1,734,000,000 | 3,863,000,000 | 3,171,000,000 |
| Comprehensive income attributable to Parent | 1,945,000,000 | 1,822,000,000 | 3,793,000,000 | 3,259,000,000 |
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Comcast Holdings [Member]
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| Interest expense | (3,000,000) | (2,000,000) | (6,000,000) | (5,000,000) |
| Investment income (loss), net | 0 | 6,000,000 | 3,000,000 | 3,000,000 |
| Equity in net income (losses) of investees, net | 1,908,000,000 | 1,909,000,000 | 4,175,000,000 | 3,651,000,000 |
| Nonoperating income (Expense), Total | 1,905,000,000 | 1,913,000,000 | 4,172,000,000 | 3,649,000,000 |
| Income (loss) before income taxes | 1,905,000,000 | 1,913,000,000 | 4,172,000,000 | 3,649,000,000 |
| Income tax (expense) benefit | 1,000,000 | (1,000,000) | 1,000,000 | 1,000,000 |
| Net income (loss) | 1,906,000,000 | 1,912,000,000 | 4,173,000,000 | 3,650,000,000 |
| Net income (loss) attributable to Parent | 1,906,000,000 | 1,912,000,000 | 4,173,000,000 | 3,650,000,000 |
| Comprehensive income attributable to Parent | 1,912,000,000 | 1,905,000,000 | 4,181,000,000 | 3,643,000,000 |
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CCCL Parent [Member]
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| Management fee revenue | 231,000,000 | 219,000,000 | 454,000,000 | 431,000,000 |
| Revenue | 231,000,000 | 219,000,000 | 454,000,000 | 431,000,000 |
| Other operating and administrative | 231,000,000 | 219,000,000 | 454,000,000 | 431,000,000 |
| Costs and expenses, total | 231,000,000 | 219,000,000 | 454,000,000 | 431,000,000 |
| Interest expense | (44,000,000) | (46,000,000) | (89,000,000) | (124,000,000) |
| Equity in net income (losses) of investees, net | 1,774,000,000 | 1,835,000,000 | 3,939,000,000 | 3,598,000,000 |
| Other income (expense), net | 2,000,000 | 2,000,000 | ||
| Nonoperating income (Expense), Total | 1,730,000,000 | 1,791,000,000 | 3,850,000,000 | 3,476,000,000 |
| Income (loss) before income taxes | 1,730,000,000 | 1,791,000,000 | 3,850,000,000 | 3,476,000,000 |
| Income tax (expense) benefit | 15,000,000 | 16,000,000 | 31,000,000 | 43,000,000 |
| Net income (loss) | 1,745,000,000 | 1,807,000,000 | 3,881,000,000 | 3,519,000,000 |
| Net income (loss) attributable to Parent | 1,745,000,000 | 1,807,000,000 | 3,881,000,000 | 3,519,000,000 |
| Comprehensive income attributable to Parent | 1,744,000,000 | 1,808,000,000 | 3,882,000,000 | 3,522,000,000 |
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Combined CCHMO Parents [Member]
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| Management fee revenue | 145,000,000 | 137,000,000 | 286,000,000 | 270,000,000 |
| Revenue | 145,000,000 | 137,000,000 | 286,000,000 | 270,000,000 |
| Other operating and administrative | 145,000,000 | 137,000,000 | 286,000,000 | 270,000,000 |
| Costs and expenses, total | 145,000,000 | 137,000,000 | 286,000,000 | 270,000,000 |
| Interest expense | (30,000,000) | (33,000,000) | (59,000,000) | (66,000,000) |
| Equity in net income (losses) of investees, net | 1,554,000,000 | 1,349,000,000 | 3,065,000,000 | 2,611,000,000 |
| Nonoperating income (Expense), Total | 1,524,000,000 | 1,316,000,000 | 3,006,000,000 | 2,545,000,000 |
| Income (loss) before income taxes | 1,524,000,000 | 1,316,000,000 | 3,006,000,000 | 2,545,000,000 |
| Income tax (expense) benefit | 11,000,000 | 12,000,000 | 21,000,000 | 23,000,000 |
| Net income (loss) | 1,535,000,000 | 1,328,000,000 | 3,027,000,000 | 2,568,000,000 |
| Net income (loss) attributable to Parent | 1,535,000,000 | 1,328,000,000 | 3,027,000,000 | 2,568,000,000 |
| Comprehensive income attributable to Parent | 1,535,000,000 | 1,328,000,000 | 3,028,000,000 | 2,568,000,000 |
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NBCUniversal Media Parent [Member]
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| Other operating and administrative | 237,000,000 | 205,000,000 | 494,000,000 | 430,000,000 |
| Costs and expenses, total | 237,000,000 | 205,000,000 | 494,000,000 | 430,000,000 |
| Operating income (loss) | (237,000,000) | (205,000,000) | (494,000,000) | (430,000,000) |
| Interest expense | (125,000,000) | (123,000,000) | (249,000,000) | (243,000,000) |
| Investment income (loss), net | 4,000,000 | 5,000,000 | 5,000,000 | 1,000,000 |
| Equity in net income (losses) of investees, net | 1,171,000,000 | 951,000,000 | 2,242,000,000 | 1,660,000,000 |
| Other income (expense), net | 7,000,000 | 3,000,000 | ||
| Nonoperating income (Expense), Total | 1,057,000,000 | 833,000,000 | 2,001,000,000 | 1,418,000,000 |
| Income (loss) before income taxes | 820,000,000 | 628,000,000 | 1,507,000,000 | 988,000,000 |
| Income tax (expense) benefit | (6,000,000) | (5,000,000) | (11,000,000) | (10,000,000) |
| Net income (loss) | 814,000,000 | 623,000,000 | 1,496,000,000 | 978,000,000 |
| Net income (loss) attributable to Parent | 814,000,000 | 623,000,000 | 1,496,000,000 | 978,000,000 |
| Comprehensive income attributable to Parent | 832,000,000 | 599,000,000 | 1,517,000,000 | 932,000,000 |
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Comcast Non-Guarantor Subsidiaries [Member]
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| Service revenue | 16,844,000,000 | 16,270,000,000 | 34,252,000,000 | 31,580,000,000 |
| Revenue | 16,844,000,000 | 16,270,000,000 | 34,252,000,000 | 31,580,000,000 |
| Programming and production | 4,874,000,000 | 4,968,000,000 | 10,782,000,000 | 9,631,000,000 |
| Other operating and administrative | 4,743,000,000 | 4,489,000,000 | 9,375,000,000 | 8,850,000,000 |
| Advertising, marketing and promotion | 1,242,000,000 | 1,307,000,000 | 2,452,000,000 | 2,454,000,000 |
| Depreciation | 1,591,000,000 | 1,575,000,000 | 3,153,000,000 | 3,134,000,000 |
| Amortization | 399,000,000 | 405,000,000 | 799,000,000 | 805,000,000 |
| Costs and expenses, total | 12,849,000,000 | 12,744,000,000 | 26,561,000,000 | 24,874,000,000 |
| Operating income (loss) | 3,995,000,000 | 3,526,000,000 | 7,691,000,000 | 6,706,000,000 |
| Interest expense | (46,000,000) | (49,000,000) | (100,000,000) | (92,000,000) |
| Investment income (loss), net | 115,000,000 | 1,000,000 | 223,000,000 | 79,000,000 |
| Equity in net income (losses) of investees, net | 836,000,000 | 646,000,000 | 1,550,000,000 | 1,012,000,000 |
| Other income (expense), net | (46,000,000) | (44,000,000) | (57,000,000) | 30,000,000 |
| Nonoperating income (Expense), Total | 859,000,000 | 554,000,000 | 1,616,000,000 | 1,029,000,000 |
| Income (loss) before income taxes | 4,854,000,000 | 4,080,000,000 | 9,307,000,000 | 7,735,000,000 |
| Income tax (expense) benefit | (1,378,000,000) | (1,163,000,000) | (2,607,000,000) | (2,216,000,000) |
| Net income (loss) | 3,476,000,000 | 2,917,000,000 | 6,700,000,000 | 5,519,000,000 |
| Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock | (33,000,000) | (10,000,000) | (100,000,000) | (218,000,000) |
| Net income (loss) attributable to Parent | 3,443,000,000 | 2,907,000,000 | 6,600,000,000 | 5,301,000,000 |
| Comprehensive income attributable to Parent | 3,401,000,000 | 3,007,000,000 | 6,535,000,000 | 5,414,000,000 |
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Elimination and Consolidation Adjustments [Member]
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| Management fee revenue | (613,000,000) | (581,000,000) | (1,207,000,000) | (1,144,000,000) |
| Revenue | (613,000,000) | (581,000,000) | (1,207,000,000) | (1,144,000,000) |
| Other operating and administrative | (613,000,000) | (581,000,000) | (1,207,000,000) | (1,144,000,000) |
| Costs and expenses, total | (613,000,000) | (581,000,000) | (1,207,000,000) | (1,144,000,000) |
| Equity in net income (losses) of investees, net | (9,443,000,000) | (8,577,000,000) | (19,177,000,000) | (16,016,000,000) |
| Nonoperating income (Expense), Total | (9,443,000,000) | (8,577,000,000) | (19,177,000,000) | (16,016,000,000) |
| Income (loss) before income taxes | (9,443,000,000) | (8,577,000,000) | (19,177,000,000) | (16,016,000,000) |
| Net income (loss) | (9,443,000,000) | (8,577,000,000) | (19,177,000,000) | (16,016,000,000) |
| Net income (loss) attributable to Parent | (9,443,000,000) | (8,577,000,000) | (19,177,000,000) | (16,016,000,000) |
| Comprehensive income attributable to Parent | $ (9,424,000,000) | $ (8,647,000,000) | $ (19,143,000,000) | $ (16,079,000,000) |