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Acquisition of Radian Asset Assurance Inc. - Pro Forma Information (Details) - Radian [Member] - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]    
Pro forma revenues $ 1,255 $ 1,542
Pro forma net income $ 493 $ 958
Pro forma earnings per share:    
Basic (in dollars per share) $ 3.27 $ 5.43
Diluted (in dollars per share) $ 3.25 $ 5.40