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Debt - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Sep. 30, 2025
May 31, 2025
Mar. 31, 2025
Sep. 30, 2025
Ultium Cells LLC        
Debt Instrument [Line Items]        
Principal amount   $ 1,800    
Financing receivable term   5 years    
Unsecured Debt | Senior Notes        
Debt Instrument [Line Items]        
Principal amount $ 2,000 $ 2,000   $ 2,000
Weighted average interest rate (percent)   5.70%    
Redemption of remaining aggregate principal amount outstanding 1,250      
Unsecured Debt | Senior Notes | GM Financial        
Debt Instrument [Line Items]        
Principal amount $ 9,200     $ 9,200
Weighted average interest rate (percent) 5.20%     5.20%
Unsecured Debt | $10.0 Billion Dollar Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt term     5 years  
Aggregate borrowing capacity     $ 10,000  
Unsecured Debt | 4.1 Billion Dollar Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Debt term     3 years  
Aggregate borrowing capacity     $ 4,100  
Unsecured Debt | $2.0 Billion Dollar Revolving Credit Facility | Line of Credit | GM Financial        
Debt Instrument [Line Items]        
Debt term     364 days 364 days
Aggregate borrowing capacity $ 2,000   $ 2,000 $ 2,000
Secured Debt | Line of Credit | GM Financial | Revolving Credit Facility        
Debt Instrument [Line Items]        
Aggregate borrowing capacity 19,300     19,300
Secured Debt | Securitization Notes Payable | Notes Payable, Other Payables | GM Financial        
Debt Instrument [Line Items]        
Principal amount $ 17,400     $ 17,400
Weighted average interest rate (percent) 4.75%     4.75%