Income Taxes - Temporary Differences (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Insurance reserves	$ 372	$ 511
Investments	19	48
Loss carryforwards	183	224
Deferred Tax Assets, Tax Deferred Expense, Other	70	73
Deferred Tax Assets, Tax Credit Carryforwards	65	59
Total gross assets	827	970
Insurance reserves	0	(3)
Deferred policy acquisition costs	(178)	(181)
Other liabilities	(16)	(12)
Total gross liabilities	(194)	(196)
Deferred Tax Assets, Net	633	774
Federal net operating loss carryforward	873	1,065
Tax Credit Carryforward, Amount	65	59
Other comprehensive income (loss), before tax	677	(4,594)	$ (1,264)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	61	0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	57	55
Valuation allowance, deferred tax assets	0	0
Deferred Tax Assets, Net of Valuation Allowance	$ 827	$ 970