Financial Guaranty Insurance Premiums - Net Earned Premiums (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financial Guaranty Insurance Premiums [Line Items]
Accretion of discount on net premiums receivable			$ (12)	$ (13)
Net earned premiums	136	163	268	411
Net earned premiums, consolidated FG VIEs	5	15	22	33
Financial guaranty insurance
Financial Guaranty Insurance Premiums [Line Items]
Scheduled net earned premiums	106	113	213	241
Acceleration of net earned premiums	24	46	43	159
Accretion of discount on net premiums receivable	5	3	11	10
Financial guaranty insurance net earned premiums	135	162	267	410
Other
Financial Guaranty Insurance Premiums [Line Items]
Net earned premiums	$ 1	$ 1	$ 1	$ 1