Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax expense (benefit):
Federal	$ 57	$ 14	$ 0
Deferred tax expense (benefit):
Federal	0	(1)	(51)
Total deferred tax expense (benefit)	0	(1)	(51)
Income tax expense (benefit)	$ 57	$ 13	$ (51)