Debt Instruments - Floor Plan Facility (Details) - USD ($)	Apr. 29, 2025	Nov. 01, 2023	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Line of Credit Facility [Line Items]
Line of credit, outstanding			$ 72,000,000	$ 67,000,000
Held in restricted cash			73,000,000	44,000,000	$ 65,000,000
Line of Credit \| Under 50% 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%
Line of Credit \| Between 50-59.99% Current Inventory
Line of Credit Facility [Line Items]
Deposit required under floor plan facility, percentage of principal balance		17.50%
Line of Credit \| Between 60-60.99% Current Inventory
Line of Credit Facility [Line Items]
Deposit required under floor plan facility, percentage of principal balance		22.50%
Line of Credit \| Over 70% Current Inventory
Line of Credit Facility [Line Items]
Deposit required under floor plan facility, percentage of principal balance		25.00%
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%
Floor plan facility \| Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity (up to)	$ 1,500,000,000	$ 1,500,000,000
Outstanding balance, days held in inventory threshold		120 days
Outstanding balance, held in inventory, percentage of original principal amount due		10.00%
Outstanding balance, held in inventory, original principal amount, threshold		50.00%
Outstanding balance, held in inventory, wholesale value, threshold		50.00%
Line of credit, outstanding			72,000,000	67,000,000
Line of credit facility, remaining borrowing capacity			1,400,000,000	1,400,000,000
Held in restricted cash			$ 4,000,000	$ 8,000,000
Interest rate			5.86%	6.85%
Floor plan facility \| Line of Credit \| Under 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 \| Line of Credit \| Over 50% Current Inventory
Line of Credit Facility [Line Items]
Debt instrument, basis spread on variable rate	0.10%	0.50%
Debt instrument, amount drawn, percent of inventory balance	50.00%	50.00%
Floor plan facility \| Line of Credit \| Between 50-59.99% Current Inventory \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, amount drawn, percent of inventory balance		50.00%
Floor plan facility \| Line of Credit \| Between 50-59.99% Current Inventory \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, amount drawn, percent of inventory balance		59.99%
Floor plan facility \| Line of Credit \| Between 60-60.99% Current Inventory \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, amount drawn, percent of inventory balance		60.00%
Floor plan facility \| Line of Credit \| Between 60-60.99% Current Inventory \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, amount drawn, percent of inventory balance		69.99%
Floor plan facility \| Line of Credit \| Over 70% Current Inventory
Line of Credit Facility [Line Items]
Debt instrument, amount drawn, percent of inventory balance		70.00%
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, 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%
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%

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