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Consolidated Statements Of Operations (Parenthetical) (Non Variable Interest Entity [Member], Financial Guarantee Insurance Segment [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Non Variable Interest Entity [Member] | Financial Guarantee Insurance Segment [Member]
       
Ceded premiums earned $ 2 $ 3 $ 7 $ 12