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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Tax Examination [Line Items]
Income tax expense (benefit)	$ 490	$ 971	$ 462	$ 2,148
Net deferred tax assets	$ 20,200		20,200
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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