Consolidated Statements Of Operations - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Premiums earned:
Net gains (losses) on financial instruments at fair value and foreign exchange		$ (20)	$ 24	$ 31	$ (39)
Net gains (losses) on extinguishment of debt		14		14
Total revenues		18	114	90	108
Expenses:
Losses and loss adjustment		9	136	107	379
Interest		41	45	82	92
Total expenses		79	220	257	547
Income (loss) before income taxes		(61)	(106)	(167)	(439)
Provision (benefit) for income taxes		0	0	0	0
Net income (loss)		$ (61)	$ (106)	$ (167)	$ (439)
Net income (loss) per common share:
Basic		$ (1.23)	$ (1.69)	$ (3.38)	$ (6.51)
Diluted		$ (1.23)	$ (1.69)	$ (3.38)	$ (6.51)
Weighted average number of common shares outstanding:
Basic	[1]	49,488,368	62,605,656	49,373,883	67,347,335
Diluted		49,488,368	62,605,656	49,373,883	67,347,335
Non Variable Interest Entity [Member]
Premiums earned:
Scheduled premiums earned		$ 12	$ 15	$ 27	$ 31
Refunding premiums earned		2	4	7	8
Premiums earned (net of ceded premiums of $1, $1, $2 and $2)		14	19	34	39
Net investment income		14	20	29	43
Fees and reimbursements		1	0	1	0
Net gains (losses) on financial instruments at fair value and foreign exchange		(20)	24	31	(39)
Net gains (losses) on extinguishment of debt		14	0	14	0
Expenses:
Losses and loss adjustment		9	136	107	379
Amortization of deferred acquisition costs		3	3	5	5
Operating		21	22	47	40
Interest		41	45	82	92
Variable Interest Entity Primary Beneficiary [Member]
Premiums earned:
Net investment income		0	5	0	13
Net gains (losses) on financial instruments at fair value and foreign exchange		0	23	(14)	38
Other net realized gains (losses)		(5)	23	(5)	14
Expenses:
Operating		1	1	3	3
Interest		$ 4	$ 13	$ 13	$ 28

[1] Includes 0.9 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the three months and six months ended June 30, 2021 and 2020, respectively.