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Insider Trading Arrangements
 3 Months Ended
Jun. 30, 2025
shares
Trading Arrangements, by Individual  
Material Terms of Trading Arrangement
During the three months ended June 30, 2025, the following directors or officers of the Company adopted a "Rule 10b5-1 trading arrangement" or "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408(a) of Regulation S-K: (1) on May 6, 2025, Rory Harvey, Executive Vice President and President, Global Markets, adopted a trading plan intended to satisfy Rule 10b5-1(c) to sell up to 18,325 shares of GM common stock and the exercise of vested stock options and the associated sale of up to 16,711 shares of GM common stock between August 5, 2025 and February 28, 2026, subject to certain conditions; and (2) on May 29, 2025, Mary Barra, Chair and Chief Executive Officer, adopted a trading plan intended to satisfy Rule 10b5-1(c) to sell up to 500,000 shares of GM common stock and the exercise of vested stock options and the associated sale of up to 1,214,048 shares of GM common stock between August 28, 2025 and May 30, 2026, 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, Global Markets
Rule 10b5-1 Arrangement Adopted true
Adoption Date May 6, 2025
Expiration Date February 28, 2026
Arrangement Duration 298 days
Mary Barra [Member]  
Trading Arrangements, by Individual  
Name Mary Barra
Title Chair and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted true
Adoption Date May 29, 2025
Expiration Date May 30, 2026
Arrangement Duration 366 days
Rory Harvey Trading Arrangement Exercise Of Vested Stock Options [Member] | Rory Harvey [Member]  
Trading Arrangements, by Individual  
Aggregate Available 18,325
Rory Harvey Trading Arrangement Common Stock [Member] | Rory Harvey [Member]  
Trading Arrangements, by Individual  
Aggregate Available 16,711
Mary Barra Rule Trading Arrangement Exercise Of Vested Stock Options [Member] | Mary Barra [Member]  
Trading Arrangements, by Individual  
Aggregate Available 500,000
Mary Barra Rule Trading Arrangement Common Stock [Member] | Mary Barra [Member]  
Trading Arrangements, by Individual  
Aggregate Available 1,214,048