Reinsurance and Other Monoline Exposures - Effect of Reinsurance on Statement of Operations (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Premiums Written:
Direct		$ 42	$ 23	$ 63	$ 52
Assumed (1)	[1]	(6)	(1)	(8)	2
Ceded		0	2	(17)	2
Net		36	24	38	56
Premiums Earned:
Direct		220	224	410	372
Assumed		5	12	13	22
Ceded		(11)	(17)	(26)	(33)
Net	[2]	214	219	397	361
Loss and LAE:
Direct		101	186	210	212
Assumed		11	19	(3)	12
Ceded		(10)	(17)	(15)	(18)
Net		$ 102	$ 188	$ 192	$ 206

[1] (1)Negative assumed premiums written were due to changes in expected debt service schedules.

[2] Excludes $3 million and $5 million for Second Quarter 2016 and 2015, respectively, and $8 million and $10 million for Six Months 2016 and 2015, respectively, related to consolidated FG VIEs.