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Acquisitions - Pro Forma Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
MBIA UK [Member]    
Business Acquisition [Line Items]    
Pro forma revenues $ 1,849  
Pro forma net income $ 1,005  
Pro forma earnings per share:    
Basic (in dollars per share) $ 7.55  
Diluted (in dollars per share) $ 7.49  
Radian [Member]    
Business Acquisition [Line Items]    
Pro forma revenues   $ 2,030
Pro forma net income   $ 922
Pro forma earnings per share:    
Basic (in dollars per share)   $ 6.22
Diluted (in dollars per share)   $ 6.18