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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Insurance [Abstract]    
Loss and LAE reserve $ 981 $ 1,088
Reinsurance recoverable on unpaid losses (7) (8)
Loss and LAE reserve, net 974 1,080
Salvage and subrogation recoverable (1,148) (991)
Salvage and subrogation reinsurance payable 21 33
Salvage and subrogation recoverable, net (1,127) (958)
Net reserve (salvage) $ (153) $ 122