Reinsurance and Other Monoline Exposures - Effect of Reinsurance on Statement of Operations (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Premiums Written:
Direct		$ 41	$ 52	$ 93	$ 100
Assumed		(1)	(5)	1	(6)
Ceded		0	0	2	(22)
Net		40	47	96	72
Premiums Earned:
Direct		224	151	596	438
Assumed		7	12	29	32
Ceded		(18)	(19)	(51)	(58)
Net	[1]	213	144	574	412
Loss and LAE:
Direct		111	(58)	323	46
Assumed		23	11	35	26
Ceded		(22)	3	(40)	(18)
Net		$ 112	$ (44)	$ 318	$ 54

[1] Excludes $6 million and $5 million for Third Quarter 2015 and 2014, respectively, and $16 million and $27 million for Nine Months 2015 and 2014, respectively, related to consolidated financial guaranty ("FG") VIEs.