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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	15 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 564	$ 1,122	$ 564	$ 1,122
Additions, interest accretion and other	219	46
Payments	(175)	(317)
Revisions to estimates and effect of foreign currency	(25)	(21)
Balance at end of period	583	830		583
GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	489
Expected costs	400			400
GMI [Member] | Australia, New Zealand and Thailand [Member] | Asset Impairments, Sales Allowances and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	270
GMI [Member] | Australia, New Zealand and Thailand [Member] | Dealer Restructurings and Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring charges	219
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		790
Cost since inception					$ 3,100
GMNA [Member] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments	$ (171)	$ (315)		$ (1,300)
Forecast [Member] | GMI [Member] | Australia, New Zealand and Thailand [Member]
Restructuring Reserve [Roll Forward]
Expected amount of cash flows			300
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			$ 200

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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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