Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Premiums, fees and reimbursements received	$ 19	$ 73
Investment income received	143	162
Insured derivative commutations and losses paid	(11)	(49)
Financial guarantee losses and loss adjustment expenses paid	(477)	(367)
Proceeds from recoveries and reinsurance	117	46
Operating and employee related expenses paid	(60)	(68)
Interest paid, net of interest converted to principal	(144)	(119)
Income taxes (paid) received	(2)	(1)
Net cash provided (used) by operating activities	(415)	(323)
Cash flows from investing activities:
Purchases of available-for-sale investments	(1,759)	(1,684)
Sales of available-for-sale investments	1,875	1,647
Paydowns and maturities of available-for-sale investments	722	245
Purchases of investments at fair value	(129)	(142)
Sales, paydowns, maturities and other proceeds of investments at fair value	583	162
Sales, paydowns and maturities (purchases) of short-term investments, net	(131)	269
Paydowns and maturities of loans receivable	68	365
Consolidation of variable interest entities	72	0
Deconsolidation of variable interest entities	(2)	(7)
(Payments) proceeds for derivative settlements	(95)	(19)
Net cash provided (used) by investing activities	1,204	836
Cash flows from financing activities:
Proceeds from investment agreements	11	9
Principal paydowns of investment agreements	(13)	(30)
Principal paydowns of medium-term notes	(57)	(62)
Principal paydowns of variable interest entity notes	(671)	(382)
Principal paydowns of long-term debt	(150)	0
Purchases of treasury stock	(96)	(15)
Other financing	(12)	0
Net cash provided (used) by financing activities	(988)	(480)
Net increase (decrease) in cash and cash equivalents	(199)	33
Cash and cash equivalents—beginning of period	280	146
Cash and cash equivalents—end of period	81	179
Reconciliation of net income (loss) to net cash provided (used) by operating activities:
Net income (loss)	(116)	(289)
Change in:
Premiums receivable	40	54
Deferred acquisition costs	9	18
Accrued investment income	19	9
Unearned premium revenue	(88)	(142)
Loss and loss adjustment expense reserves	(34)	50
Insurance loss recoverable	(249)	(192)
Accrued interest payable	75	113
Accrued expenses	5	(10)
Net investment losses related to other-than-temporary impairments	37	3
Unrealized (gains) losses on insured derivatives	(23)	(36)
Net (gains) losses on financial instruments at fair value and foreign exchange	(152)	(47)
Other net realized (gains) losses	60	126
Deferred income tax provision (benefit)	(29)	1
Interest on variable interest entities, net	(4)	14
Other operating	35	5
Total adjustments to net income (loss)	(299)	(34)
Net cash provided (used) by operating activities	$ (415)	$ (323)