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Restructuring And Other Initiatives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 564	$ 1,122	$ 227	$ 268
Additions, interest accretion and other		629	1,637	330
Payments		(1,101)	(600)	(315)
Revisions to estimates and effect of foreign currency		(86)	(142)	(56)
Balance at end of period		564	1,122	227
GMI | Separation Programs in South Africa and India
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges				460
GMI | Separation Programs in Australia, Korea, South Africa, India and Chevrolet Europe
Restructuring Reserve [Roll Forward]
Restructuring cost incurred to date				892
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs
Restructuring Reserve [Roll Forward]
Payments		(1,100)
Restructuring cost incurred to date		3,100
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs | GMNA
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges		1,800	1,300
Employee Severance | GMNA
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges			1,000
Non-cash Accelerated Depreciation | GMNA
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges		1,300	301
Supplier Related Charges and Employee Separation Charges | GMNA
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges		$ 535
Facility closing | GMI | Gunsan Korea Plant
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges			1,000
Severance Costs			495
Non-cash Asset Impairments and Other Charges | GMI | Gunsan Korea Plant
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges			537
Employee Severance and Statutory Pension Payments | GMI | Gunsan Korea Plant
Restructuring Reserve [Roll Forward]
Payments			$ (775)
Asset Impairments, Sales Incentives, Inventory Provisions and Other Restructuring Costs | GMI | Separation Programs in South Africa and India
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges				297
Dealer Restructuring, Employee Severance and Contract Termination Costs | GMI | Separation Programs in South Africa and India
Restructuring Reserve [Roll Forward]
Restructuring charges and other charges				$ 163
Forecast | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs | GMNA
Restructuring Reserve [Roll Forward]
Expected amount of cash flows	$ 400

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