Quarterly Financial Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended																12 Months Ended
	Feb. 07, 2013	Feb. 09, 2012	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues
Net earned premiums			$ 182		$ 159		$ 163		$ 248		$ 218		$ 222		$ 219		$ 194		$ 752	[1]	$ 853	[1]	$ 920	[1]
Net investment income			107		99		93		94		103		102		101		98		393		404		396
Net realized investment gains (losses)			29		(7)		2		28		1		2		(3)		1		52		1		(18)
Net change in fair value of credit derivatives			229		354		74		(592)		(119)		(36)		261		(691)		65		(585)		560
Fair value gains (losses) on CCS			14		9		(3)		(10)		(6)		(2)		4		(14)		10		(18)		35
Fair value gains (losses) on FG VIEs			93		40		143		70		30		34		168		(41)		346		191		(146)
Other income (loss)			(5)		16		(7)		(14)		(4)		16		5		91		(10)		108		58
Expenses
Loss and LAE			85		55		62		(48)		58		86		118		242		154		504		448
Amortization of DAC			4		4		1		3		0		4		5		5		12		14		17
Interest expense			19		21		21		21		21		21		25		25		82		92		99
Other operating expenses			52		54		52		60		49		48		53		62		218		212		212
Income (loss) before provision for income taxes			489		536		329		(212)		95		179		554		(696)		1,142		132		1,029
Provision (benefit) for income taxes			140		152		110		(68)		21		37		177		(213)		334		22		256
Net income (loss)			$ 349		$ 384		$ 219		$ (144)		$ 74		$ 142		$ 377		$ (483)		$ 808		$ 110		$ 773
Earnings (loss) per share, Basic (in dollars per share)			$ 1.91	[2]	$ 2.10	[2]	$ 1.17	[2]	$ (0.74)	[2]	$ 0.38	[2]	$ 0.73	[2]	$ 2.02	[2]	$ (2.65)	[2]	$ 4.32	[2]	$ 0.58	[2]	$ 4.21
Earnings (loss) per share, Diluted (in dollars per share)			$ 1.90	[2]	$ 2.09	[2]	$ 1.16	[2]	$ (0.74)	[2]	$ 0.38	[2]	$ 0.73	[2]	$ 2.01	[2]	$ (2.65)	[2]	$ 4.30	[2]	$ 0.57	[2]	$ 4.16
Dividends per share	$ 0.10	$ 0.09	$ 0.10	[2]	$ 0.10	[2]	$ 0.10	[2]	$ 0.10	[2]	$ 0.09	[2]	$ 0.09	[2]	$ 0.09	[2]	$ 0.09	[2]	$ 0.40	[2]	$ 0.36	[2]	$ 0.18

[1] Excludes $60 million, $153 million and $75 million for the year ended December 31, 2013, 2012 and 2011, respectively, related to consolidated FG VIEs.

[2] Per share amounts for the quarters and the full years have each been calculated separately. Accordingly, quarterly amounts may not sum up to the annual amounts because of differences in the average common shares outstanding during each period and, with regard to diluted per share amounts only, because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive.