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Income Taxes - Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current      
Current federal income tax expense (benefit) $ 3 $ (1) $ 1
Current state income tax expense 0 3 5
Deferred      
Deferred federal income tax expense (5) (10) 32
Deferred state income tax expense (benefit) 8 18 15
Total income tax expense (benefit) $ 6 $ 10 $ 53