|
Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Sep. 30, 2012
|
Jun. 30, 2012
|
Mar. 31, 2012
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Mar. 19, 2013
|
|
| Net income attributable to Parent | $ 1,913 | $ 1,732 | $ 1,734 | $ 1,437 | $ 1,518 | $ 2,113 | $ 1,348 | $ 1,224 | $ 6,816 | $ 6,203 | $ 4,160 | |
| Changes in equity resulting from net income attributable to Comcast Corporation and transfers from (to) noncontrolling interests | 5,139 | |||||||||||
| Remaining equity interest acquired | 49.00% | |||||||||||
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Redemption Transaction [Member]
|
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| Increase (decrease) in Comcast Corporation additional paid-in capital resulting from the purchase of noncontrolling interest | (1,651) | |||||||||||
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Other Purchase [Member]
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| Increase (decrease) in Comcast Corporation additional paid-in capital resulting from the purchase of noncontrolling interest | $ (26) | |||||||||||