Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current tax expense (benefit):
Federal	$ 0	$ (45)	$ 6
Total current tax expense (benefit)	0	(45)	6
Deferred tax expense (benefit):
Federal	(50)	208	(20)
Total deferred tax expense (benefit)	(50)	208	(20)
Income tax expense (benefit)	$ (50)	$ 163	$ (14)