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	$ (118)
Current state income tax expense	3	(23)	5
Deferred
Deferred federal income tax expense (benefit)	19	49	124
Deferred state income tax expense (benefit)	14	(8)	6
Total income tax expense (benefit)	$ 37	$ 20	$ 17