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Net Investments in Operating Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]        
Length of lease contract 60 months or less      
Vehicles, at cost $ 32,821 $ 32,659    
Accumulated depreciation (6,035) (5,927)    
Net investment in operating leases before allowance for credit losses 26,786 26,732 $ 26,495  
Allowance for credit losses (71) (71) (67) $ (64)
Net investment in operating leases 26,715 26,661 $ 26,428  
Net Investment in Operating Leases [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Continuing Involvement with Continued to be Recognized Transferred Financial Assets, Amount Outstanding $ 12,000 $ 11,500