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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details)
$ in Billions
 6 Months Ended
Jun. 30, 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) 1,500,000,000 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 | $ $ 2.7  
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