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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
Current federal income tax expense $ 48 $ 68 $ 29
Current state income tax expense (benefit) 6 10 (2)
Deferred      
Deferred federal income tax expense (benefit) (5) (354) 1
Deferred state income tax expense (benefit) 2 (11) 5
Total income tax expense (benefit) $ 51 $ (287) $ 33