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Restructuring and Other Initiatives - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]                
Restructuring payments     $ 379,000,000 $ 363,000,000 $ 1,274,000,000 $ 935,000,000    
Restructuring charges     366,000,000 $ 369,000,000 868,000,000 $ 781,000,000    
GMNA                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     1,600,000,000          
GMNA | Dealer Restructuring and Employee Separation Payments                
Restructuring Cost and Reserve [Line Items]                
Pre-tax restructuring costs         0      
Restructuring payments         708,000,000      
Cost incurred since 2022     2,000,000,000   2,000,000,000     $ 2,000,000,000
Cash outflows to date     2,000,000,000.0   2,000,000,000.0     2,000,000,000.0
GMNA | Contract Termination                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     404,000,000          
GMNA | Contract Cancellation Fees And Commercial Settlements                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     356,000,000          
GMNA | Electric Vehicle Capacity Adjustment                
Restructuring Cost and Reserve [Line Items]                
Restructuring charges     1,200,000,000          
Cruise                
Restructuring Cost and Reserve [Line Items]                
Pre-tax restructuring costs $ 522,000,000           $ 529,000,000  
Restructuring payments               577,000,000
Restructuring charges $ 173,000,000 $ 631,000,000            
Contract cancellation fees and commercial settlements             $ 250,000,000  
Expected cost to be paid in 2025     $ 137,000,000   $ 137,000,000     $ 137,000,000