Reinsurance and Other Monoline Exposures - Effect of Reinsurance on Statement of Operations (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Premiums Written:
Direct										$ 164		$ 116		$ 106
Assumed	[1]									17		(12)		17
Ceded	[2]									10		15		2
Net										191		119		125
Premiums Earned:
Direct										792		581		819
Assumed										40		47		40
Ceded										(66)		(58)		(107)
Net		$ 192	$ 213	$ 219	$ 142	$ 158	$ 144	$ 136	$ 132	766	[3]	570	[3]	752	[3]
Loss and LAE:
Direct										399		132		110
Assumed										45		37		73
Ceded										(20)		(43)		(29)
Net		$ 106	$ 112	$ 188	$ 18	$ 72	$ (44)	$ 57	$ 41	$ 424		$ 126		$ 154

[1] Negative assumed premiums written were due to changes in expected Debt Service schedules

[2] Positive ceded premiums written were due to commutations and changes in expected Debt Service schedules.

[3] Excludes $21 million, $32 million and $60 million for the year ended December 31, 2015, 2014 and 2013, respectively, related to consolidated FG VIEs.