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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended			18 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 583	$ 830	$ 480	$ 564	$ 1,122	$ 1,122
Additions, interest accretion and other	35	242		254	288
Payments	(163)	(166)		(338)	(483)
Revisions to estimates and effect of foreign currency	25	13		0	(8)
Balance at end of period	480	919		480	919	480
GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	92			581
Expected costs	$ 400			400		400
GMI [Member] | Australia, New Zealand and Thailand [Member] | Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				335
GMI [Member] | Australia, New Zealand and Thailand [Member] | Dealer Restructurings and Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				246
GMI [Member] | Australia, New Zealand and Thailand [Member] | Sales Allowances and Dealer Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payments				(69)
GMI [Member] | Australia and New Zealand [Member]
Restructuring Reserve [Roll Forward]
Valuation allowance against deferred tax assets				236
GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		361			1,200
Cost since inception							$ 3,100
GMNA [Member] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments				$ (307)	(487)	$ (1,400)
GMNA [Member] | Supplier-related Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		231			240
GMNA [Member] | Non-cash Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges		$ 130			$ 911
Forecast [Member] | GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows			200
Forecast [Member] | GMI [Member] | Thailand
Restructuring Reserve [Roll Forward]
Proceeds from Divestiture of Businesses, Net of Cash Divested			130
Forecast [Member] | GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows			$ 100

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- Definition

Amount of any reversal and other adjustment made during the period to the amount of a previously accrued liability for a specified type of restructuring cost including foreign currency translation adjustments, excluding adjustments for costs incurred during the period and costs settled during the period.

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