Reinsurance - Effects of Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Insurance [Abstract]
Direct Premiums Earned	$ 5	$ 9	$ 31
Assumed Premiums Earned	0	0	0
Ceded Premiums Earned	(4)	0	(2)
Total premiums, net	1	9	29
Policyholder Benefits and Claims Incurred, Direct	864	857	920
Policyholder Benefits and Claims Incurred, Assumed	95	5	4
Policyholder Benefits and Claims Incurred, Ceded	86	92	107
Policyholder Interest and Other Benefits, Net	873	770	817
Effects of Reinsurance [Line Items]
Reinsurance Recoverables, Including Reinsurance Premium Paid	2,421	2,560
Ceded Insurance Commissions And Fees	7	0	0
Assumed Insurance Commissions and Fees	$ 94	$ 0	$ 0