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Assumption of Insured Portfolio and Business Combinations - Pro Forma Information (Details) - MBIA UK [Member]
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
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) | $ / shares $ 7.55
Diluted (in dollars per share) | $ / shares $ 7.49