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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 633	$ 296	$ 274	$ 227	$ 268
Additions, interest accretion and other	137	250		592	290
Payments	(458)	(53)		(495)	(75)
Revisions to estimates and effect of foreign currency	(38)	0		(50)	10
Balance at end of period	274	493		274	493
Gunsan Korea Plant [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Termination benefits	59			495
Gunsan Korea Plant [Member] | Non-cash Asset Impairments and Other Charges [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs				537
Gunsan Korea Plant [Member] | Supplier Claims [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs	73
Gunsan Korea Plant [Member] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments	(676)
Gunsan Korea Plant [Member] | Statutory Payments and Supplier Claims [Member] | Forecast [Member]
Restructuring Reserve [Roll Forward]
Expected additional cash outflows			$ 200
GMI [Member] | Gunsan Korea Plant [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs	$ 132			$ 1,000
GMI [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs		460			460
GMI [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
GMI [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
GMI [Member] | Separation Programs in Australia, Korea, South Africa, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Total cost incurred to date		$ 866			$ 866	$ 892

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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The quantified amount of the future effect on cash flows.

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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 restructuring charges, remediation cost, and asset impairment loss.

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