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Restructuring and Other Initiatives (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) employee	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) employee	Jun. 30, 2016 USD ($)
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 296	$ 606	$ 268	$ 383
Additions, interest accretion and other	250	40	290	340
Payments	(53)	(311)	(75)	(405)
Revisions to estimates and effect of foreign currency	0	(2)	10	15
Balance at end of period	493	333	493	333
GMIO [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs	460		460
GMIO [Member] | Separation Programs In South Africa And India [Member] | Asset Impairments, Sales Incentives, Inventory Provisions and Other Restructuring Costs [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs	297
GMIO [Member] | Separation Programs In South Africa And India [Member] | Dealer Restructuring, Employee Severance and Contract Termination Costs [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs	163
GMIO [Member] | Separation Programs in Australia, Korea and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Total cost incurred to date	$ 866		$ 866
Employees affected | employee	4,690		4,690
GMNA [Member] | Cash Severance Incentive Programs [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other		$ 240		$ 240

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.

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

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The number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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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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