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Income Taxes (Components of Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Federal $ 37 $ 139 $ 123
State 21 42 36
Foreign 106 36 28
Total current income taxes 164 217 187
Federal (97) (18) (13)
State (35) (1) (2)
Foreign (4) 5 9
Total deferred income taxes (136) (14) (6)
Total income tax provision $ 28 $ 203 $ 181