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Income Taxes - Income Tax Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 189 $ 342 $ 402
State 39 44 53
Foreign 17 19 16
Current income tax provision 245 405 471
Deferred:      
Federal 110 (250) 21
State 24 3 5
Foreign (1) 0 (5)
Deferred income tax provision 133 (247) 21
Income tax provision $ 378 $ 158 $ 492