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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current      
Current federal income tax expense (benefit) $ 1 $ 2 $ (175)
Current state income tax expense 5 (21) 4
Deferred      
Deferred federal income tax expense 32 59 179
Deferred state income tax expense (benefit) 15 (7) 11
Total income tax expense (benefit) $ 53 $ 33 $ 19