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Insider Trading Arrangements
 3 Months Ended 6 Months Ended
Jun. 30, 2024
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Jun. 30, 2024
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Trading Arrangements, by Individual    
Material Terms of Trading Arrangement  
During the three months ended June 30, 2024, Rory Harvey, Executive Vice President and President, Global Markets, adopted a "Rule 10b5-1 trading arrangement" as such term is defined in Item 408(a) of Regulation S-K, on May 5, 2024, to sell up to 4,145 shares of GM common stock and up to 35,778 shares of GM common stock issuable upon exercise of vested options between August 5, 2024 and April 18, 2025, subject to certain conditions.
Non-Rule 10b5-1 Arrangement Adopted false  
Rule 10b5-1 Arrangement Terminated false  
Non-Rule 10b5-1 Arrangement Terminated false  
Rory Harvey [Member]    
Trading Arrangements, by Individual    
Name Rory Harvey  
Title Executive Vice President and President  
Rule 10b5-1 Arrangement Adopted true  
Adoption Date May 5, 2024  
Arrangement Duration 256 days  
Rory Harvey Trading Arrangement Common Stock [Member] | Rory Harvey [Member]    
Trading Arrangements, by Individual    
Aggregate Available 4,145 4,145
Rory Harvey Trading Arrangement Exercise Of Vested Stock Options [Member] | Rory Harvey [Member]    
Trading Arrangements, by Individual    
Aggregate Available 35,778 35,778