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Debt Instruments - Floor Plan Facility (Details) - USD ($)
$ in Millions
Apr. 29, 2025
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Line of Credit Facility [Line Items]        
Line of credit, outstanding   $ 73 $ 67  
Held in restricted cash   79 44 $ 61
Line of Credit | Under 25% Current Inventory        
Line of Credit Facility [Line Items]        
Deposit required under floor plan facility, percentage of principal balance 5.00%      
Line of Credit | Between 25-49.99% Current Inventory        
Line of Credit Facility [Line Items]        
Deposit required under floor plan facility, percentage of principal balance 12.50%      
Line of Credit | Over 50% Current Inventory        
Line of Credit Facility [Line Items]        
Deposit required under floor plan facility, percentage of principal balance 25.00%      
Floor plan facility | Line of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity (up to) $ 1,500      
Line of credit, outstanding   73 67  
Line of credit facility, remaining borrowing capacity   1,400 1,400  
Held in restricted cash   $ 4 $ 8  
Interest rate   5.89% 6.85%  
Floor plan facility | Line of Credit | Under 25% Current Inventory        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 0.70%      
Debt instrument, amount drawn, percent of inventory balance 25.00%      
Floor plan facility | Line of Credit | Between 25-49.99% Current Inventory        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 0.50%      
Debt instrument, amount drawn, percent of inventory balance 25.00%      
Floor plan facility | Line of Credit | Between 25-49.99% Current Inventory | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument, amount drawn, percent of inventory balance 50.00%      
Floor plan facility | Line of Credit | Over 50% Current Inventory        
Line of Credit Facility [Line Items]        
Debt instrument, basis spread on variable rate 0.10%      
Debt instrument, amount drawn, percent of inventory balance 50.00%      
Floor Plan Facility, 18-Month | Line of Credit | Under 25% Current Inventory        
Line of Credit Facility [Line Items]        
Debt instrument, amount drawn, percent of inventory balance 25.00%      
Floor Plan Facility, 18-Month | Line of Credit | Between 25-49.99% Current Inventory | Minimum        
Line of Credit Facility [Line Items]        
Debt instrument, amount drawn, percent of inventory balance 25.00%      
Floor Plan Facility, 18-Month | Line of Credit | Between 25-49.99% Current Inventory | Maximum        
Line of Credit Facility [Line Items]        
Debt instrument, amount drawn, percent of inventory balance 49.99%      
Floor Plan Facility, 18-Month | Line of Credit | Over 50% Current Inventory        
Line of Credit Facility [Line Items]        
Debt instrument, amount drawn, percent of inventory balance 50.00%