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Stockholders' Equity and Noncontrolling Interests - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Feb. 28, 2025
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) 933,000,000           933,000,000     995,000,000
Common stock shares outstanding (in shares) 933,000,000           933,000,000     995,000,000
Dividends declared per common share (in dollars per share) $ 0.15     $ 0.12     $ 0.42 $ 0.36    
Cash dividends paid on common stock $ 141 $ 144 $ 116 $ 133 $ 136 $ 139 $ 401 $ 407    
Purchase of common stock 1,500 $ 0 $ 2,012 $ 1,036 $ 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 $ 1,300           $ 6,500      
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  
Shares repurchased and retired during period (in shares)             27,000,000 53,000,000    
Purchase of common stock             $ 1,500 $ 2,400    
Accelerated Share Repurchase                    
Class of Stock [Line Items]                    
Capacity under common stock repurchase plan                 $ 2,000  
Shares repurchased and retired during period (in shares)             43,000,000