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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Examination [Line Items] |  |  |  |
Income tax expense (benefit) | $ 845 | $ 152 | $ 1,308 | $ 2,300
Net deferred tax assets | $ 19,800 |  | 19,800 |
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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