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)	$ 37	$ 2	$ 1
Current state income tax expense	(1)	4	3
Deferred
Deferred federal income tax expense (benefit)	(33)	28	19
Deferred state income tax expense (benefit)	7	19	14
Total income tax expense (benefit)	$ 10	$ 53	$ 37