v3.3.0.814
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share        
Net income attributable to Parent $ 1,996 $ 2,592 $ 6,192 $ 6,455
Basic shares attributable to Comcast Corporation shareholders 2,472 2,580 2,498 2,592
Assumed exercise or issuance of shares relating to stock plans 30 36 32 37
Diluted shares attributable to Comcast Corporation shareholders 2,502 2,616 2,530 2,629
Basic earnings per common share attributable to Comcast Corporation shareholders $ 0.81 $ 1 $ 2.48 $ 2.49
Diluted earnings per common share attributable to Comcast Corporation shareholders $ 0.8 $ 0.99 $ 2.45 $ 2.46