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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Insurance [Abstract]    
Loss and LAE reserve $ 1,193 $ 1,127
Reinsurance recoverable on unpaid losses (74) (80)
Loss and LAE reserve, net 1,119 1,047
Salvage and subrogation recoverable (405) (365)
Salvage and subrogation payable 20 17
Other payable (recoverable) 2 (1)
Salvage and subrogation recoverable, net, and other recoverable (387) (347)
Net reserves (salvage) $ 732 $ 700