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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
vote
shares
Dec. 31, 2020
shares
Sep. 30, 2020
USD ($)
$ / shares
Class of Stock [Line Items]      
Preferred stock shares authorized (in shares) 2,000,000,000 2,000,000,000  
Common stock shares authorized (in shares) 5,000,000,000 5,000,000,000  
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 | $ $ 2,700    
Series G Preferred Stock | General Motors Holdings LLC | GM Cruise Holdings LLC      
Class of Stock [Line Items]      
Proceeds from sale of stock | $ $ 1,000    
Number of votes each share is entitled to | vote 1    
Preferred stock transfer restriction period 4 years    
Fixed-to-Floating Rate Cumulative Perpetual Preferred Stock, Series B | GM Financial      
Class of Stock [Line Items]      
Preferred stock issued | $     $ 500
Preferred stock par value (in dollars per share) | $ / shares     $ 0.01
Preferred stock liquidation preference (in usd per share) | $ / shares     $ 1,000