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Stockholders' Equity and Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock shares authorized (in shares) |  | 2,000,000,000 |  |  | 2,000,000,000 |  | 2,000,000,000
Common stock shares authorized (in shares) |  | 5,000,000,000 |  |  | 5,000,000,000 |  | 5,000,000,000
Preferred stock shares outstanding (in shares) |  | 0 |  |  | 0 |  | 0
Preferred stock shares issued (in shares) |  | 0 |  |  | 0 |  | 0
Common stock shares issued (in shares) |  | 1,500,000,000 |  |  | 1,500,000,000 |  | 1,500,000,000
Common stock shares outstanding (in shares) |  | 1,500,000,000 |  |  | 1,500,000,000 |  | 1,500,000,000
Deemed dividends on subsidiary preferred stock |  | $ (26) |  | $ (46) | $ (978) | $ (91) |
Cruise Stock Incentive Awards |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash used to settle awards |  | 200 | $ 0 |  |  |  |
GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payments to acquire additional investment | $ 1,350 |  |  |  |  |  |
GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payments to acquire additional investment |  |  |  |  | 1,350 |  |
Net income attributable to shareholders and transfers to the noncontrolling interests | 2,000 |  |  |  |  |  |
Series G Preferred Stock | Microsoft, General Motors Holdings LLC and Other Investors | GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  | $ 2,700
Series G Preferred Stock | General Motors Holdings LLC | GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from sale of stock |  |  |  |  |  |  | $ 1,000
Cruise Class A-1, Class F and Class G Preferred Shares | SoftBank | GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Payments for repurchase of equity | 2,100 |  |  |  |  |  |
Cruise Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Deemed dividends on subsidiary preferred stock | $ 909 |  |  |  | 909 |  |
Common Class B |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Recorded value of vested awards |  | 400 |  |  | $ 400 |  |
Common Class B | Cruise Stock Incentive Awards |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Cash used to settle awards |  | 200 |  |  |  |  |
Common Class B | GM Cruise Holdings LLC |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Amount of stock issued during period |  | 700 |  |  |  |  |
Payments for statutory tax withholdings |  | $ 400 |  |  |  |  |

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