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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current      
Current federal income tax expense (benefit) $ (1) $ 1 $ 2
Current state income tax expense 3 5 (21)
Deferred      
Deferred federal income tax expense (10) 32 59
Deferred state income tax expense (benefit) 18 15 (7)
Total income tax expense (benefit) $ 10 $ 53 $ 33