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Business Combinations and Assumption of Insured Portfolio - Pro Forma Information (Details) - BlueMountain Capital Management, LLC [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Pro forma revenues $ 1,079 $ 1,210
Pro forma net income $ 358 $ 436
Pro forma earnings per share:    
Basic (in dollars per share) $ 3.60 $ 3.96
Diluted (in dollars per share) $ 3.57 $ 3.92