Consolidated Statements Of Operations - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Premiums earned:
Net gains (losses) on financial instruments at fair value and foreign exchange		$ 11	$ 13	$ 42	$ (26)
Net gains (losses) on extinguishment of debt		16		30
Total revenues		72	71	162	179
Expenses:
Losses and loss adjustment		125	48	232	427
Interest		40	43	122	135
Total expenses		195	129	452	676
Income (loss) before income taxes		(123)	(58)	(290)	(497)
Provision (benefit) for income taxes		0	0	0	0
Net income (loss)		$ (123)	$ (58)	$ (290)	$ (497)
Net income (loss) per common share:
Basic		$ (2.49)	$ (1.11)	$ (5.87)	$ (7.97)
Diluted		$ (2.49)	$ (1.11)	$ (5.87)	$ (7.97)
Weighted average number of common shares outstanding:
Basic	[1]	49,552,796	52,588,533	49,434,177	62,391,826
Diluted		49,552,796	52,588,533	49,434,177	62,391,826
Non Variable Interest Entity [Member]
Premiums earned:
Scheduled premiums earned		$ 26	$ 14	$ 53	$ 45
Refunding premiums earned		3	2	10	10
Premiums earned (net of ceded premiums of $14, $1, $16 and $3)		29	16	63	55
Net investment income		16	16	45	59
Fees and reimbursements		5	2	6	2
Net gains (losses) on financial instruments at fair value and foreign exchange		11	13	42	(26)
Net gains (losses) on extinguishment of debt		16	0	30	0
Expenses:
Losses and loss adjustment		125	48	232	427
Amortization of deferred acquisition costs		0	2	5	7
Operating		23	21	70	61
Interest		40	43	122	135
Variable Interest Entity Primary Beneficiary [Member]
Premiums earned:
Net investment income		0	5	0	18
Net gains (losses) on financial instruments at fair value and foreign exchange		4	(4)	(10)	34
Other net realized gains (losses)		(9)	23	(14)	37
Expenses:
Operating		2	1	5	4
Interest		$ 5	$ 14	$ 18	$ 42

[1] Includes 0.9 million and 1.0 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the three months ended September 30, 2021 and 2020, respectively. 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 nine months ended September 30, 2021 and 2020.