Financial Guaranty Insurance - Components of Unearned Premium Reserve (Details) - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Insurance [Abstract]
Deferred premium revenue, gross		$ 3,710	$ 4,008
Deferred premium revenue, ceded		217	238
Deferred premium revenue, net	[1]	3,493	3,770
Contra-paid, gross	[2]	(42)	(12)
Contra-paid, ceded	[2]	(4)	(6)
Contra-paid, net	[1],[2]	(38)	(6)
Unearned premium reserve, gross		3,668	3,996
Unearned premium reserve, ceded		213	232
Unearned premium reserve, net	[1]	3,455	3,764
Total net unearned premium reserve related to FG VIE		93	110
Contra-paid related to FG VIE		$ 28	$ 30

[1] Excludes $93 million and $110 million of deferred premium revenue, and $28 million and $30 million of contra-paid related to FG VIEs as of September 30, 2016 and December 31, 2015, respectively.

[2] See "Financial Guaranty Insurance Losses– Insurance Contracts' Loss Information" below for an explanation of "contra-paid".