v3.25.4
Equity in Net Assets of Nonconsolidated Affiliates - Direct Ownership Interests in our China JVs (Details)
Dec. 31, 2025
Dec. 31, 2024
SGM    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00% 50.00%
PATAC    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 50.00% 50.00%
SGMS    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 49.00% 49.00%
SGMW    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 44.00% 44.00%
Shanghai OnStar    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 40.00% 40.00%
SGM Norsom    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 25.00% 25.00%
SGM DY    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 25.00% 25.00%
SGM DYPT    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 25.00% 25.00%
SAIC-GMAC    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 35.00% 35.00%
SAIC-GMF Leasing Co., Ltd.    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 35.00% 35.00%