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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 919	$ 274	$ 1,122	$ 227		$ 227
Additions, interest accretion and other	211	8	499	600
Payments	(162)	(72)	(645)	(567)
Revisions to estimates and effect of foreign currency	(30)	(3)	(38)	(53)
Balance at end of period	938	$ 207	938	207		1,122
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Payments			(645)
Cost since inception	2,900		2,900
GMNA [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	390		1,500
GMNA [Member] | Pension Curtailment and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	209
GMNA [Member] | Supplier-related Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	$ 181		421
GMNA [Member] | Non-cash Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges			$ 1,100
GMI [Member] | Korea [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				1,000
GMI [Member] | Korea [Member] | Non-cash Asset Impairments [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				537
GMI [Member] | Korea [Member] | Employee Separation Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges				495
GMI [Member] | Korea [Member] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments				$ (748)		$ (775)
Forecast [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows					$ 900
Forecast [Member] | Minimum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected costs							$ 100
Forecast [Member] | Maximum [Member] | Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Expected costs							$ 300

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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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