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Reinsurance - Exposure by Reinsurer (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Due (To) From [Abstract]    
Assumed premium, net of commissions $ 82 $ 53
Ceded premium, net of commissions (26) (42)
Assumed expected loss to be paid (49) (71)
Ceded expected loss to be paid 14 29
Financial Guaranty [Abstract]    
Assumed par outstanding 16,904 8,383
Financial guaranty Ceded par outstanding 2,389 4,434
Non-Financial Guaranty Exposure [Abstract]    
Assumed 1,081 974
Ceded 239 159
Non-affiliated Reinsurers [Member]    
Non-Financial Guaranty Exposure [Abstract]    
Collateral posted by non-affiliated reinsurers 80 118
Below Investment Grade, Rating Withdrawn Or Not Rated Reinsurer [Member] | External Credit Rating, Non Investment Grade [Member]    
Non-Financial Guaranty Exposure [Abstract]    
Ceded par outstanding $ 236 $ 296