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Stockholders' Equity and Noncontrolling Interests - Preferred and Common Stock (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
Sep. 30, 2017
Dec. 31, 2020
USD ($)
Votes
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
Class of Stock [Line Items]            
Preferred stock shares authorized | shares     2,000,000,000.0      
Common stock shares authorized | shares     5,000,000,000.0      
Preferred stock shares outstanding | shares     0 0    
Common stock number of shares issued | shares     1,400,000,000 1,400,000,000    
Common stock shares outstanding | shares     1,400,000,000 1,400,000,000    
Dividends declared per common share (in dollars per share) | $ / shares     $ 0.38 $ 1.52 $ 1.52  
Cash dividends paid on common stock     $ 545 $ 2,165 $ 2,144  
Number of votes per share | Votes     1      
Common shares purchased during period | shares         3,000,000  
Amount of common stock purchased during period     $ 90   $ 190  
Outstanding warrants (in shares) | shares         15,000,000  
Guarantees - maximum liability     3,100 2,600    
Second Tranche of Warrants            
Class of Stock [Line Items]            
Exercise price (in dollars per share) | $ / shares         $ 18.33  
GM Cruise            
Class of Stock [Line Items]            
Investment amount         $ 1,100  
GM Cruise | Series F Preferred Stock            
Class of Stock [Line Items]            
Proceeds from issuance of preferred stock       1,200    
Investment amount       $ 687    
GM Cruise | Convertible Preferred Stock            
Class of Stock [Line Items]            
Annual dividend rate         7.00%  
Proceeds from issuance of preferred stock         $ 900  
GM Cruise | SoftBank Vision Fund (AIV M2), L.P. | Convertible Preferred Stock            
Class of Stock [Line Items]            
Additional purchase amount         1,350  
GM Cruise | Honda Motor Co., Ltd | Common Class E            
Class of Stock [Line Items]            
Proceeds from issuance of common stock         750  
GM Korea            
Class of Stock [Line Items]            
Planned capital expenditures         $ 2,000  
GM Korea | Korea Development Bank | Class B Preferred Shares            
Class of Stock [Line Items]            
Annual dividend rate         1.00%  
Proceeds from issuance of preferred stock         $ 720  
Financial Guarantee | GM Korea            
Class of Stock [Line Items]            
Guarantees - maximum liability         2,800  
GM Financial | 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%          
GM Financial | Series A Preferred Stock            
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   6.50%        
GM            
Class of Stock [Line Items]            
Amount of common stock purchased during period     $ 90   $ 100