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Restructuring And Other Initiatives (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) employees	Dec. 31, 2015 USD ($) employees	Dec. 31, 2014 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 1,378	$ 581	$ 1,378	$ 1,349
Additions, interest accretion and other		456	566	1,013
Payments		(649)	(883)	(862)
Revisions to estimates and effect of foreign currency		(38)	(480)	(122)
Ending Balance		350	581	1,378
GMNA [Member]
Restructuring Reserve [Roll Forward]
Temporary Layoffs Benefits				354
GMNA [Member] | Cash Severance Incentive Programs [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other		240
GMNA [Member] | US Supplemental Unemployment Benefits Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring Accrual Reversal			(317)
GME [Member] | Germany Separation Programs [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other				620
Restructuring and Related Cost, Cost Incurred to Date				841
GME [Member] | Russia exit [Member]
Restructuring Reserve [Roll Forward]
Cost Related to Business Withdrawal	337
GMIO [Member] | Separation Programs in Australia, Korea, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other		110
Restructuring and Related Cost, Cost Incurred to Date		$ 805
Employees Affected, Inception to Date | employees		4,510
Expected Cost Remaining		$ 65
GMIO [Member] | Separation Programs in Australia, Korea, Thailand, Indonesia, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other			208
Restructuring and Related Cost, Cost Incurred to Date			$ 722
Employees Affected, Inception to Date | employees			5,490
GMIO [Member] | Separation Programs in Australia, Korea, and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other				193
Restructuring and Related Cost, Cost Incurred to Date				$ 514
GMIO [Member] | Russia exit [Member]
Restructuring Reserve [Roll Forward]
Cost Related to Business Withdrawal	$ 91
GME and GMIO [Member] | Russia exit [Member]
Restructuring Reserve [Roll Forward]
Number of Dealers and Distributors Impacted, Inception to Date			300
Number of Employees Impacted, Inception to Date | employees			1,130
Cost Related to Business Withdrawal			$ 443
Noncontrolling Interest Adjustments			$ 56

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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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The number of dealers and distributors impacted as of the balance sheet date since inception of the restructuring plan(s).

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