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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Insurance [Abstract]    
Loss and LAE reserve $ 982 $ 1,050
Reinsurance recoverable on unpaid losses (8) (38)
Loss and LAE reserve, net 974 1,012
Salvage and subrogation recoverable (961) (747)
Salvage and subrogation payable 34 30
Salvage and subrogation recoverable, net (927) (717)
Net reserves (salvage) $ 47 $ 295