SEC Schedule, Article 12-16, Supplementary Insurance Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense	$ 805	$ 1,570
Unearned premiums	372	395
Premiums Earned, Net	56	47	$ 54
Net Investment Income	17	139	122
Policyholder Benefits and Claims Incurred, Net	(396)
Deferred Policy Acquisition Costs, Amortization Expense	3	1	0
General and Administrative Expense	141	111	92
Premiums Written, Net	23	(33)	$ 0
Financial Guarantee
Liability for Claims and Claims Adjustment Expense	715	1,538
Deferred Policy Acquisition Cost	0	0
Unearned premiums	287	385
Premiums Earned, Net	42	46
Net Investment Income	12	138
Policyholder Benefits and Claims Incurred, Net	(406)	(89)
Deferred Policy Acquisition Costs, Amortization Expense	0
General and Administrative Expense	104	78
Premiums Written, Net	(6)	(35)
Property and Casualty, Commercial Insurance
Liability for Claims and Claims Adjustment Expense	90	32
Deferred Policy Acquisition Cost	3	0
Unearned premiums	85	10
Premiums Earned, Net	14	1
Net Investment Income	2	1
Policyholder Benefits and Claims Incurred, Net	9	0
Deferred Policy Acquisition Costs, Amortization Expense	3	0
General and Administrative Expense	13	9
Premiums Written, Net	29	3
Corporate and Other
Net Investment Income	$ 3	$ 1