Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Premiums, fees and reimbursements received	$ 3	$ 3
Investment income received	37	44
Financial guarantee losses and loss adjustment expenses paid	(75)	(95)
Proceeds from recoveries and reinsurance	10	60
Operating and employee related expenses paid	(34)	(34)
Interest paid, net of interest converted to principal	(23)	(46)
Income taxes (paid) received	0	(2)
Net cash provided (used) by operating activities	(82)	(70)
Cash flows from investing activities:
Purchases of available-for-sale investments	(242)	(747)
Sales of available-for-sale investments	279	683
Paydowns and maturities of available-for-sale investments	123	234
Purchases of investments at fair value	(33)	(69)
Sales, paydowns, maturities and other proceeds of investments at fair value	34	122
Sales, paydowns and maturities (purchases) of short-term investments, net	178	(154)
Sales, paydowns and maturities of held-to-maturity investments	315	0
Paydowns and maturities of loans receivable	3	7
Consolidation of variable interest entities	0	72
(Payments) proceeds for derivative settlements	(3)	(11)
Collateral (to) from counterparties	(44)	(9)
Net cash provided (used) by investing activities	610	128
Cash flows from financing activities:
Proceeds from investment agreements	3	3
Principal paydowns of investment agreements	(12)	0
Principal paydowns of variable interest entity notes	(323)	(168)
Purchases of treasury stock	(62)	(10)
Net cash provided (used) by financing activities	(394)	(175)
Net increase (decrease) in cash and cash equivalents	134	(117)
Cash and cash equivalents - beginning of period	83	280
Cash and cash equivalents - end of period	217	163
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(333)	(21)
Change in:
Premiums receivable	1	22
Deferred acquisition costs	2	3
Unearned premium revenue	(19)	(43)
Loss and loss adjustment expense reserves	84	(58)
Insurance loss recoverable	86	(20)
Accrued interest payable	35	30
Accrued expenses	(19)	(11)
Net investment losses related to other-than-temporary impairments	0	28
Unrealized (gains) losses on insured derivatives	0	(14)
Net (gains) losses on financial instruments at fair value and foreign exchange	48	(40)
Other net realized (gains) losses	9	41
Other operating	24	13
Total adjustments to net income (loss)	251	(49)
Net cash provided (used) by operating activities	$ (82)	$ (70)