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Income Tax Expense (Components of Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Federal $ 16 $ 0 $ 15
State 7 (2) 5
Total current income tax expense (benefit) 23 (2) 20
Federal 9 24 7
State 4 4 3
Total deferred tax expense 13 28 10
Income tax expense $ 36 $ 26 $ 30