Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Premiums, fees and reimbursements received	$ 20	$ 19
Investment income received	96	143
Insured derivative commutations and losses paid	0	(11)
Financial guarantee losses and loss adjustment expenses paid	(461)	(477)
Proceeds from recoveries and reinsurance	69	117
Operating and employee related expenses paid	(58)	(60)
Interest paid, net of interest converted to principal	(67)	(144)
Income taxes (paid) received	13	(2)
Net cash provided (used) by operating activities	(388)	(415)
Cash flows from investing activities:
Purchases of available-for-sale investments	(900)	(1,759)
Sales of available-for-sale investments	862	1,875
Paydowns and maturities of available-for-sale investments	613	722
Purchases of investments at fair value	(137)	(129)
Sales, paydowns, maturities and other proceeds of investments at fair value	139	583
Sales, paydowns and maturities (purchases) of short-term investments, net	77	(131)
Sales, paydowns and maturities of held-to-maturity investments	315	0
Paydowns and maturities of loans receivable	11	68
Consolidation of variable interest entities	0	72
Deconsolidation of variable interest entities	0	(2)
(Payments) proceeds for derivative settlements	(12)	(95)
Net cash provided (used) by investing activities	968	1,204
Cash flows from financing activities:
Proceeds from investment agreements	10	11
Principal paydowns of investment agreements	(21)	(13)
Principal paydowns of medium-term notes	0	(57)
Principal paydowns of variable interest entity notes	(333)	(671)
Principal paydowns of long-term debt	0	(150)
Purchases of treasury stock	(200)	(96)
Other financing	(8)	(12)
Net cash provided (used) by financing activities	(552)	(988)
Net increase (decrease) in cash and cash equivalents	28	(199)
Cash and cash equivalents - beginning of period	83	280
Cash and cash equivalents - end of period	111	81
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(497)	(145)
Change in:
Premiums receivable	13	40
Deferred acquisition costs	7	9
Accrued investment income	6	19
Unearned premium revenue	(53)	(88)
Loss and loss adjustment expense reserves	101	(34)
Insurance loss recoverable	(105)	(249)
Accrued interest payable	102	75
Accrued expenses	25	5
Net investment losses related to other-than-temporary impairments	0	37
Unrealized (gains) losses on insured derivatives	0	(23)
Net (gains) losses on financial instruments at fair value and foreign exchange	(8)	(152)
Other net realized (gains) losses	(37)	60
Other operating	58	31
Total adjustments to net income (loss)	109	(270)
Net cash provided (used) by operating activities	$ (388)	$ (415)