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DEBT - Additional Information (Details)
Jul. 20, 2023
USD ($)
Feb. 09, 2023
USD ($)
financialInstitution
financeCompany
Sep. 30, 2023
USD ($)
JPM Warehouse Facility      
Debt Instrument [Line Items]      
Total financing commitment (up to) $ 1,000,000,000    
Facility drawn     $ 375,000,000
Mizuho Warehouse Facility      
Debt Instrument [Line Items]      
Total financing commitment (up to) 750,000,000    
Facility drawn $ 210,000,000    
Line of credit | Syndicated Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, number of counter-parties | financialInstitution   20  
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany   8  
Financing commitment amount   $ 4,500,000,000  
Total financing commitment (up to)   $ 5,500,000,000  
Line of credit | Syndicated Credit Facility | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   0.10%  
Line of credit | Syndicated Credit Facility | Used vehicle floor plan      
Debt Instrument [Line Items]      
Total financing commitment (up to)   $ 800,000,000  
Option to reallocate commitment, maximum aggregate commitment threshold percentage   40.00%  
Line of credit | Syndicated Credit Facility | Used vehicle floor plan | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   1.40%  
Line of credit | Syndicated Credit Facility | Revolving line of credit      
Debt Instrument [Line Items]      
Total financing commitment (up to)   $ 1,700,000,000  
Line of credit | Syndicated Credit Facility | Revolving line of credit | SOFR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   1.00%  
Line of credit | Syndicated Credit Facility | Revolving line of credit | SOFR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   2.00%  
Line of credit | Syndicated Credit Facility | New vehicle floor plan      
Debt Instrument [Line Items]      
Total financing commitment (up to)   $ 1,950,000,000  
Line of credit | Syndicated Credit Facility | New vehicle floor plan | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   1.10%  
Line of credit | Syndicated Credit Facility | Service loaner floor plan      
Debt Instrument [Line Items]      
Total financing commitment (up to)   $ 50,000,000  
Option to reallocate commitment, maximum aggregate commitment threshold percentage   3.00%  
Line of credit | Syndicated Credit Facility | Service loaner floor plan | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent)   1.20%  
Line of credit | JPM Warehouse Facility | SOFR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent) 1.15%    
Line of credit | JPM Warehouse Facility | SOFR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent) 1.95%    
Line of credit | Mizuho Warehouse Facility | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate (as a percent) 1.20%