Consolidated Statements Of Operations (Parenthetical) (Non Variable Interest Entity [Member], Financial Guarantee Insurance Segment [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Non Variable Interest Entity [Member] | Financial Guarantee Insurance Segment [Member]
Ceded premiums earned	$ 2	$ 2	$ 5	$ 5