Federal Income Taxes - Federal Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current	$ (255)	$ (24)	$ 20
Deferred	(418)	(413)	717
Federal income tax expense (benefit)	$ (673)	$ (437)	$ 737