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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
vote
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Class of Stock [Line Items]      
Preferred stock shares authorized | shares 2,000,000,000    
Common stock shares authorized | shares 5,000,000,000    
Preferred stock shares outstanding | shares 0 0  
Common stock number of shares issued | shares 1,500,000,000 1,400,000,000  
Common stock shares outstanding | shares 1,500,000,000 1,400,000,000  
Dividends declared per common share (in dollars per share) | $ / shares   $ 0.38 $ 1.52
Cash dividends paid on common stock   $ 545 $ 2,165
Number of votes per share | vote 1    
Common shares purchased during period | shares 0 3,000,000 0
Amount of common stock purchased during period   $ 90  
GM Cruise | Series G Preferred Shares      
Class of Stock [Line Items]      
Number of votes per share | vote 1    
Preferred Stock, Stock Transfer Restriction Period 4 years    
GM Cruise | Series G Preferred Shares | Microsoft and other investors      
Class of Stock [Line Items]      
Proceeds from sale of stock $ 2,700    
GM Cruise | Series G Preferred Shares | General Motors Holdings LLC      
Class of Stock [Line Items]      
Proceeds from sale of stock $ 1,000    
GM Cruise | Series F Preferred Stock      
Class of Stock [Line Items]      
Proceeds from issuance of preferred stock     $ 1,200
Investment amount     $ 687
Automotive Financing | Fixed-to-Floating Rate Cumulative Perpetual Preferred Stock, Series B      
Class of Stock [Line Items]      
Preferred stock issued   $ 500  
Preferred stock par value (in dollars per share) | $ / shares   $ 0.01  
Liquidation preference of preferred stock per share (in dollars per share) | $ / shares   $ 1,000  
Annual dividend rate   5.70%