Segment Reporting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Premiums Earned, Net	$ 78	$ 56	$ 47
Insurance Commissions and Fees	51	31	26
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	8	3	0
Net Investment Income	140	17	139
Realized Investment Gains (Losses)	(22)	31	7
Derivative, Gain (Loss) on Derivative, Net	(1)	129	22
Net realized gains on extinguishment of debt	0	81	33
Other income Items	15	31	8
Losses and loss adjustment expenses		(396)	(88)
Deferred Policy Acquisition Costs, Amortization Expense	11	3	1
Insurance Commissions	29	18	15
Operating Expenses	155	139	110
Depreciation	2	2	2
Amortization of intangible assets	29	47	55
Interest Expense	64	168	187
Benefits, Losses and Expenses	257	(20)	281
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	12	525	2
Income Tax Expense (Benefit)	7	2	18
Assets	8,428	7,973	12,303
Gain (Loss) Related to Litigation Settlement		126	0
Revenues	269	505	282
Policyholder Benefits and Claims Incurred, Net	(33)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	5	522	(16)
Legacy Financial Guarantee
Premiums Earned, Net	26	42	46
Net Investment Income	127	12	138
Realized Investment Gains (Losses)	(23)	32	3
Derivative, Gain (Loss) on Derivative, Net	(1)	128	22
Net realized gains on extinguishment of debt		81	33
Other income Items	15	30	8
Losses and loss adjustment expenses		(406)	(89)
Deferred Policy Acquisition Costs, Amortization Expense	0	0	0
Operating Expenses	106	102	77
Depreciation	1	2	2
Amortization of intangible assets	25	44	52
Interest Expense	64	168	187
Benefits, Losses and Expenses	127	(89)	230
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	17	540	20
Income Tax Expense (Benefit)	8	3	16
Assets	7,537	7,292	11,871
Gain (Loss) Related to Litigation Settlement		126	0
Revenues	144	451	250
Policyholder Benefits and Claims Incurred, Net	(69)	(406)	(89)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9	537	4
Specialty Property & Casualty Program
Premiums Earned, Net	52	14	1
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset	8	3	0
Net Investment Income	4	2	1
Realized Investment Gains (Losses)	0	0	0
Other income Items	0	0	0
Losses and loss adjustment expenses		9	0
Deferred Policy Acquisition Costs, Amortization Expense	11	3	0
Operating Expenses	16	13	9
Depreciation	0	0	0
Benefits, Losses and Expenses	64	25	9
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	0	(6)	(8)
Income Tax Expense (Benefit)	0	0	0
Assets	523	316	156
Revenues	64	18	2
Policyholder Benefits and Claims Incurred, Net	37
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0	(6)	(8)
Insurance Distribution
Insurance Commissions and Fees	51	31	26
Net Investment Income	0
Realized Investment Gains (Losses)
Other income Items	0	1	0
Insurance Commissions	29	18	15
Operating Expenses	11	6	5
Depreciation	0	0	0
Amortization of intangible assets	4	3	3
Benefits, Losses and Expenses	44	27	22
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	7	5	4
Income Tax Expense (Benefit)	0	0	0
Assets	155	138	93
Revenues	52	31	26
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	7	5	4
Corporate and Other
Net Investment Income	9	3	1
Realized Investment Gains (Losses)	0	0	4
Derivative, Gain (Loss) on Derivative, Net	0	1
Other income Items	0	0	0
Operating Expenses	21	17	19
Depreciation	0	0	0
Benefits, Losses and Expenses	22	17	19
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(13)	(14)	(15)
Income Tax Expense (Benefit)	(1)	0	2
Assets	213	226	182
Revenues	9	4	5
Surplus Notes			90
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (11)	$ (13)	$ (17)