Consolidated Statements Of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Non Variable Interest Entity [Member] | Financial Guarantee Insurance Segment [Member]
Ceded premiums earned	$ 2	$ 2	$ 3	$ 5