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Contracts Accounted for as Insurance - Components of Net Reserves (Salvage) Insurance Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Insurance [Abstract]    
Loss and LAE reserve $ 1,444 $ 1,127
Reinsurance recoverable on unpaid losses (44) (80)
Loss and LAE reserve, net 1,400 1,047
Salvage and subrogation recoverable (572) (365)
Salvage and subrogation payable 20 17
Other payable (recoverable) (4) 1
Salvage and subrogation recoverable, net, and other recoverable (556) (347)
Net reserves (salvage) $ 844 $ 700