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Stockholders' Equity and Noncontrolling Interests - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Class of Stock [Line Items]                
Preferred stock shares authorized (in shares)   2,000,000,000.0       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   5,000,000,000.0
Preferred stock shares issued (in shares)   0       0   0
Preferred stock shares outstanding (in shares)   0       0   0
Common stock shares issued (in shares)   957,000,000       957,000,000   995,000,000
Common stock shares outstanding (in shares)   957,000,000       957,000,000   995,000,000
Cash dividends paid on common stock   $ 144 $ 116 $ 136 $ 139 $ 260 $ 274  
Purchase of common stock   0 $ 2,012 $ 1,030 $ 331      
Cruise Preferred Shares                
Class of Stock [Line Items]                
Increase in equity due to preferred stock redemption           538    
GM Cruise Holdings LLC                
Class of Stock [Line Items]                
Net income attributable to shareholders and transfers to the noncontrolling interests   $ 1,900       $ 5,200    
Common Stock Repurchase Program                
Class of Stock [Line Items]                
Increased capacity under common stock repurchase plan $ 6,000              
Capacity under common stock repurchase plan 6,300              
Purchase of common stock             $ 1,400  
Shares repurchased and retired during period (in shares)             31,000,000  
Accelerated Share Repurchase                
Class of Stock [Line Items]                
Capacity under common stock repurchase plan 2,000              
Amount advanced during period $ 2,000              
Common stock shares repurchased during period (in shares) 33,000,000              
Purchase of common stock $ 1,600              
Shares repurchased and retired during period (in shares)   10,000,000