Financial Guaranty Insurance Premiums (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Financial Guaranty Insurance Premiums [Line Items]
Accretion of discount on net premiums receivable					$ (15)		$ (19)
Net earned premiums	159	[1]	222	[1]	570	[1]	635	[1]
Net earned premiums, consolidated FG VIEs	14		17		47		50
Financial guaranty
Financial Guaranty Insurance Premiums [Line Items]
Scheduled net earned premiums	117		144		358		441
Acceleration of premium earnings	40		73		199		178
Accretion of discount on net premiums receivable	2		4		12		15
Total financial guaranty insurance	159		221		569		634
Other
Financial Guaranty Insurance Premiums [Line Items]
Net earned premiums	$ 0		$ 1		$ 1		$ 1

[1] Excludes $14 million and $17 million for Third Quarter 2013 and 2012, respectively, and $47 million and $50 million for the Nine Months 2013 and 2012, respectively, related to consolidated FG VIEs.