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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Insurance [Abstract]    
Loss and LAE reserve $ 1,058 $ 1,088
Reinsurance recoverable on unpaid losses (6) (8)
Loss and LAE reserve, net 1,052 1,080
Salvage and subrogation recoverable (977) (991)
Salvage and subrogation payable 15 33
Other payable (recoveries) (1) 0
Salvage and subrogation recoverable, net and other recoverable (963) (958)
Net reserves (salvage) $ 89 $ 122