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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | May 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Stockholders' Equity Note [Abstract] |  |  |  |  |
Preferred stock shares authorized (in shares) | 2,000,000,000.0 |  | 2,000,000,000.0 |  | 2,000,000,000.0
Common stock shares authorized (in shares) | 5,000,000,000.0 |  | 5,000,000,000.0 |  | 5,000,000,000.0
Preferred stock shares outstanding (in shares) | 0 |  | 0 |  | 0
Common stock shares issued (in shares) | 1,400,000,000 |  | 1,400,000,000 |  | 1,400,000,000
Common stock shares outstanding (in shares) | 1,400,000,000 |  | 1,400,000,000 |  | 1,400,000,000
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of subsidiary preferred stock (Note 18) |  |  | $ 492 | $ 463 |
Series F Preferred Stock [Member] | GM Cruise Holdings LLC [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of preferred stock |  | $ 1,100 |  |  |
Investment in subsidiaries |  | $ 687 |  |  |
Series C Preferred Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Proceeds from issuance of subsidiary preferred stock (Note 18) | $ 500 |  |  |  |
Preferred stock par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |
Preferred stock liquidation preference (in usd per share) | $ 1,000 |  | $ 1,000 |  |
Preferred stock dividend rate | 5.70% |  |  |  |

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