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Equipment on Operating Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]      
Equipment on operating leases, net $ 42,882 $ 34,342  
Vehicles [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Equipment on operating leases 53,947 41,851  
Less: accumulated depreciation (9,959) (6,399)  
Equipment on operating leases, net 43,988 35,452  
Depreciation expense 6,700 4,700 $ 2,500
Vehicles [Member] | GM Financial [Member]      
Property Subject to or Available for Operating Lease [Line Items]      
Equipment on operating leases, net 42,882 $ 34,342  
Minimum rental receipts under operating leases      
2018 6,848    
2019 4,530    
2020 1,759    
2021 189    
2022 $ 12