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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
Oct. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Votes
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2027
USD ($)
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         $ 1.52 $ 1.52 $ 1.52  
Cash dividends paid on common stock         $ 2,165 $ 2,144 $ 2,215  
Number of votes per share | Votes         1      
Common shares purchased during period | shares         0 3,000,000,000,000 120,000,000  
Amount of common stock purchased during period         $ 0 $ 190 $ 4,492  
Guarantees - maximum liability         2,600 $ 2,400    
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      
Ownership Percentage         6.60%      
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              
Agreed upon future contributions $ 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    
Period to call preferred shares           6 years    
Financial Guarantee | GM Korea                
Class of Stock [Line Items]                
Guarantees - maximum liability           $ 2,800    
Forecast | GM Korea                
Class of Stock [Line Items]                
Planned capital expenditures               $ 2,000
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   6.50%            
GM Financial | Series A Preferred Stock                
Class of Stock [Line Items]                
Preferred stock issued       $ 1,000        
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       5.75%        
GM                
Class of Stock [Line Items]                
Amount of common stock purchased during period           $ 100    
GM Cruise                
Class of Stock [Line Items]                
Ownership interest         17.30%      
GM Cruise | Honda Motor Co., Ltd | Common Class E                
Class of Stock [Line Items]                
Ownership interest 5.70%