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Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Income Tax Examination [Line Items]
Income tax expense (benefit)		$ (28)	$ 1,177
Net deferred tax assets	$ 20,400	$ 20,400
GM Cruise Holdings LLC
Income Tax Examination [Line Items]
Payments to acquire additional investment	1,350
Release of valuation allowance	$ 482

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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