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 |