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Income Taxes (Components of Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax provision:      
Federal $ 103 $ 51 $ 37
State 56 17 21
Foreign 146 68 106
Total current income taxes 305 136 164
Deferred income tax provision (benefit):      
Federal 185 (16) (98)
State 116 24 (35)
Foreign 0 (1) (4)
Total deferred income provision (benefit) 301 7 (137)
Total income tax provision $ 606 $ 143 $ 27