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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details) - USD ($) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
May 31, 2019 | Jun. 30, 2020 | Dec. 31, 2019
Stockholders' Equity Note [Abstract] |  |  |
Preferred stock shares authorized (in shares) |  | 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
Preferred stock shares outstanding (in shares) |  | 0 | 0
Common stock shares issued (in shares) |  | 1,400,000,000 | 1,400,000,000
Common stock shares outstanding (in shares) |  | 1,400,000,000 | 1,400,000,000
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 |  |

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