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Acquisition of Radian Asset Assurance Inc. - Pro Forma Information (Details) - Radian [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Pro forma revenues $ 2,030 $ 2,501
Pro forma net income $ 922 $ 1,531
Pro forma earnings per share:    
Basic (in dollars per share) $ 6.22 $ 8.86
Diluted (in dollars per share) $ 6.18 $ 8.81