v3.6.0.2
Income Taxes (Components of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current Expense (Benefit):      
Federal $ 3,190 $ 3,210 $ 2,392
State 480 570 174
Foreign 194 221 142
Current income tax expense (benefit) 3,864 4,001 2,708
Deferred Expense (Benefit):      
Federal 1,192 890 1,000
State 154 66 173
Foreign 98 2 (8)
Deferred income tax expense (benefit) 1,444 958 1,165
Income tax expense 5,308 4,959 3,873
NBCUniversal Media LLC [Member]      
Current Expense (Benefit):      
Foreign 38 81 33
Deferred Expense (Benefit):      
Foreign 96 2 (8)
Deferred income tax expense (benefit) 89 (11) (12)
Withholding tax expense 158 139 108
U.S. domestic tax expense 13 5 10
Income tax expense $ 305 $ 227 $ 143