Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities:
Premiums, fees and reimbursements received	$ 2	$ 2
Investment income received	26	19
Financial guarantee losses and loss adjustment expenses paid	(28)	(336)
Proceeds from recoveries and reinsurance, net of salvage paid to reinsurers	3	622
Operating expenses paid and other operating	(34)	(22)
Other proceeds from consolidated variable interest entities	15	0
Interest paid, net of interest converted to principal	(14)	(12)
Cash (used) provided by discontinued operations	(6)	0
Net cash provided (used) by operating activities	(36)	273
Cash flows from investing activities:
Purchases of available-for-sale investments	(247)	(352)
Sales of available-for-sale investments	98	106
Paydowns and maturities of available-for-sale investments	49	65
Purchases of investments at fair value	(24)	(47)
Sales, paydowns and maturities of investments at fair value	206	44
Sales, paydowns and maturities (purchases) of short-term investments, net	(13)	(68)
Paydowns and maturities of loans receivable	3	2
(Payments) proceeds for derivative settlements	(1)	(4)
Net cash provided (used) by investing activities	71	(254)
Cash flows from financing activities:
Proceeds from investment agreements	2	2
Principal paydowns of investment agreements	(1)	(1)
Principal paydowns of variable interest entity debt	(21)	(11)
Principal paydowns of long-term debt	0	(17)
Purchases of treasury stock	(4)	(2)
Cash provided (used) by discontinued operations	4	0
Net cash provided (used) by financing activities	(20)	(29)
Effect of exchange rate changes on cash and cash equivalents	0	1
Net increase (decrease) in cash and cash equivalents	15	(9)
Cash and cash equivalents—beginning of period	78	160	$ 160
Cash and cash equivalents—end of period	93	151	78
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(86)	(73)	$ (73)
Income (loss) from discontinued operations, net of income taxes	(3)	0
Income (loss) from continuing operations	(83)	(73)
Change in:
Accrued investment income	0	(5)
Unearned premium revenue	(9)	(15)
Loss and loss adjustment expense reserves	(66)	(13)
Insurance loss recoverable	42	392
Accrued interest payable	34	24
Other assets and liabilities	7	(36)
Net realized investment gains (losses)	3	3
Net (gains) losses on financial instruments at fair value and foreign exchange	16	(13)
Other net realized (gains) losses	15	3
Other operating	5	6
Total adjustments to income (loss) from continuing operations	47	346
Net cash provided (used) by operating activities	$ (36)	$ 273