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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Insurance [Abstract]    
Loss and LAE reserve $ 882 $ 869
Reinsurance recoverable on unpaid losses (3) (5)
Loss and LAE reserve, net 879 864
Salvage and subrogation recoverable (385) (801)
Salvage and subrogation reinsurance payable 1 16
Salvage and subrogation recoverable, net (384) (785)
Net reserve (salvage) $ 495 $ 79