Equipment on Operating Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases, net	$ 41,775		$ 41,775		$ 34,342
Vehicles [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	52,632		52,632		41,851
Less: accumulated depreciation	(9,225)		(9,225)		(6,399)
Equipment on operating leases, net	43,407		43,407		35,452
Depreciation expense	1,800	$ 1,300	4,900	$ 3,300
Vehicles [Member] | GM Financial [Member]
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases, net	41,775		41,775		$ 34,342
Operating Leases, Future Minimum Payments Receivable [Abstract]
2017	1,800		1,800
2018	6,256		6,256
2019	3,861		3,861
2020	1,182		1,182
2021	$ 110		$ 110