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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details) $ in Billions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) state shares | Dec. 31, 2020 shares
Class of Stock [Line Items] |  |
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) | 1,500,000,000 | 1,400,000,000
Common stock shares outstanding (in shares) | 1,400,000,000 | 1,400,000,000
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 | $ | $ 2.5 |
Series G Preferred Stock | General Motors Holdings LLC | GM Cruise Holdings LLC |  |
Class of Stock [Line Items] |  |
Proceeds from sale of stock | $ | $ 1.0 |
Number of votes each share is entitled to | state | 1 |
Preferred stock transfer restriction period | 4 years |

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