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Quarterly Financial Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information | |||||||||||
| Revenue | $ 16,926 | $ 16,151 | $ 16,270 | $ 15,310 | $ 15,937 | $ 16,544 | $ 15,211 | $ 14,878 | $ 64,657 | $ 62,570 | $ 55,842 |
| Operating income | 3,647 | 3,414 | 3,435 | 3,067 | 3,294 | 3,048 | 3,079 | 2,758 | 13,563 | 12,179 | 10,721 |
| 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 |
| Basic earnings per common share attributable to Comcast Corporation shareholders | $ 0.73 | $ 0.66 | $ 0.66 | $ 0.55 | $ 0.57 | $ 0.79 | $ 0.50 | $ 0.45 | $ 2.60 | $ 2.32 | $ 1.51 |
| Diluted earnings per common share attributable to Comcast Corporation shareholders | $ 0.72 | $ 0.65 | $ 0.65 | $ 0.54 | $ 0.56 | $ 0.78 | $ 0.50 | $ 0.45 | $ 2.56 | $ 2.28 | $ 1.50 |
| Dividends declared per common share | $ 0.195 | $ 0.195 | $ 0.195 | $ 0.195 | $ 0.1625 | $ 0.1625 | $ 0.1625 | $ 0.1625 | $ 0.78 | $ 0.65 | $ 0.45 |