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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current      
Current federal income tax expense $ 44 $ 48 $ 68
Current state income tax expense 12 6 10
Deferred      
Deferred federal income tax expense (benefit) 0 (5) (354)
Deferred state income tax expense (benefit) (4) 2 (11)
Total income tax expense (benefit) $ 52 $ 51 $ (287)