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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current      
Current federal income tax expense (benefit) $ 2 $ (175) $ 15
Current state income tax expense (21) 4 15
Deferred      
Deferred federal income tax expense 59 179 36
Deferred state income tax expense (benefit) (7) 11 (2)
Total income tax expense (benefit) $ 33 $ 19 $ 64