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Restructuring and Other Initiatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 274	$ 493	$ 227	$ 268
Additions, interest accretion and other	8	43	600	333
Payments	(72)	(75)	(567)	(150)
Revisions to estimates and effect of foreign currency	(3)	(7)	(53)	3
Balance at end of period	$ 207	454	207	454
Gunsan Korea Plant [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Termination benefits			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] | Employee Severance and Statutory Pension Payments [Member]
Restructuring Reserve [Roll Forward]
Payments			(748)
GMI [Member] | Gunsan Korea Plant [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs			$ 1,000
GMI [Member] | Separation Programs In South Africa And India [Member]
Restructuring Reserve [Roll Forward]
Pre-tax restructuring costs				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		$ 883		$ 883	$ 892

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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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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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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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