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Income Taxes (Components of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Federal $ 3,210 $ 2,392 $ 3,183
State 570 174 581
Foreign 221 142 200
Current income tax expense (benefit) 4,001 2,708 3,964
Federal 890 1,000 (76)
State 66 173 108
Foreign deferred income tax expense 2 (8) (16)
Deferred income tax expense (benefit) 958 1,165 16
Income tax expense 4,959 3,873 3,980
NBCUniversal Media LLC [Member]      
Foreign 81 33 77
Foreign deferred income tax expense 2 (8) (16)
Deferred income tax expense (benefit) (11) (12) (10)
Withholding tax expense 139 108 123
U.S. domestic tax expense 5 10 22
Income tax expense $ 227 $ 143 $ 206