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Restructuring And Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 383	$ 268	$ 383	$ 627
Additions, interest accretion and other		330	412	545
Payments		(315)	(490)	(360)
Revisions to estimates and effect of foreign currency		(56)	(37)	(429)
Balance at end of period		227	268	383
GMNA [Member] | Cash Severance Incentive Programs [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other	$ 240		$ 240
GMNA [Member] | US Supplemental Unemployment Benefits Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring accrual reversal				(317)
GMI [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		460
GMI [Member] | Separation Programs in Australia, Korea, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Restructuring cost incurred to date		892
GMI [Member] | Separation Programs in Australia, Korea, Thailand, Indonesia, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges				$ 324
Asset Impairments, Sales Incentives, Inventory Provisions and Other Restructuring Costs [Member] | GMI [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		297
Dealer Restructuring, Employee Severance and Contract Termination Costs [Member] | GMI [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 163

X

- 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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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of costs incurred to date for the specified restructuring cost.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of restructuring charges, remediation cost, and asset impairment loss.

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