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Debt - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
Mar. 31, 2023
Jun. 30, 2023
Feb. 28, 2023
Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility      
Debt Instrument [Line Items]      
Aggregate borrowing capacity $ 10,000   $ 11,200
Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility      
Debt Instrument [Line Items]      
Aggregate borrowing capacity 4,100   $ 4,300
Unsecured Debt | Senior Notes      
Debt Instrument [Line Items]      
Principal amount $ 1,500    
Weighted average interest rate (percent) 4.875%    
GM Financial | Unsecured Debt | Line of Credit | Five Year Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt term 5 years    
GM Financial | Unsecured Debt | Line of Credit | Three Year Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt term 3 years    
GM Financial | Unsecured Debt | Line of Credit | $2.0 Billion Dollar Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt term 364 days 364 days  
Aggregate borrowing capacity $ 2,000 $ 2,000  
GM Financial | Unsecured Debt | Senior Notes      
Debt Instrument [Line Items]      
Principal amount   $ 8,300  
Weighted average interest rate (percent)   5.51%  
GM Financial | Secured Debt | Line of Credit | Revolving Credit Facility      
Debt Instrument [Line Items]      
Increase to maximum borrowing capacity   $ 10,600  
GM Financial | Secured Debt | Notes Payable, Other Payables | Securitization notes payable      
Debt Instrument [Line Items]      
Principal amount   $ 12,600  
Weighted average interest rate (percent)   5.34%