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DEBT - Narrative (Details) € in Millions						9 Months Ended
	Aug. 15, 2024 USD ($)	Jul. 09, 2024 EUR (€)	May 14, 2024 CAD ($) financialInstitution financeCompany	Feb. 23, 2024 USD ($) financeCompany financialInstitution	Feb. 16, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of non-recourse notes payable						$ 739,000,000.0	$ 1,451,700,000
Non-recourse | Asset Backed Funding Vehicles
Debt Instrument [Line Items]
Proceeds from issuance of non-recourse notes payable						$ 739,000,000.0
Syndicated Credit Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				$ 6,000,000,000
Syndicated Credit Facility | New vehicle floor plan
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				2,800,000,000
Syndicated Credit Facility | Used vehicle floor plan
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				900,000,000
Syndicated Credit Facility | Service loaner floor plan
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				$ 100,000,000
Option to reallocate commitment, maximum aggregate commitment threshold (as a percent)				3.00%
Syndicated Credit Facility | Revolving line of credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				$ 2,200,000,000
Option to reallocate commitment, maximum aggregate commitment threshold (as a percent)				40.00%
Syndicated Credit Facility, Upon Expansion of Original Line of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				$ 6,500,000,000
JPM Warehouse Facility | Securitization facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility	$ 1,000,000,000.0
Mizuho Warehouse Facility | Securitization facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility					$ 750,000,000
Bank of Nova Scotia Credit Agreement
Debt Instrument [Line Items]
Debt instrument, number of counter-parties | financialInstitution			6
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany			2
Credit facility, maximum borrowing facility			$ 1,100,000,000
Bank of Nova Scotia Credit Agreement | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.00%
Bank of Nova Scotia Credit Agreement | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.30%
Bank of Nova Scotia Credit Agreement | Working capital revolving facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility			$ 100,000,000
Bank of Nova Scotia Credit Agreement | Wholesale flooring facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility			500,000,000
Bank of Nova Scotia Credit Agreement | Used vehicle flooring facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility			100,000,000
Bank of Nova Scotia Credit Agreement | Wholesale leasing facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility			400,000,000
Bank of Nova Scotia Credit Agreement | Daily rental vehicle facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility			$ 25,000,000
Bank of America Credit Facility | Revolving line of credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility | €		€ 100.0
Basis spread on variable rate (as a percent)		1.45%
Line of credit | Syndicated Credit Facility
Debt Instrument [Line Items]
Debt instrument, number of counter-parties | financialInstitution				21
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany				8
Basis spread on variable rate (as a percent)				0.10%
Line of credit | Syndicated Credit Facility | New vehicle floor plan
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.10%
Line of credit | Syndicated Credit Facility | Used vehicle floor plan
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.40%
Line of credit | Syndicated Credit Facility | Service loaner floor plan
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.20%
Line of credit | Syndicated Credit Facility | Revolving line of credit | 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 | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.00%
Line of credit | JPM Warehouse Facility | Securitization facility | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Line of credit | JPM Warehouse Facility | Securitization facility | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.70%
Line of credit | Mizuho Warehouse Facility | Securitization facility
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)					1.20%

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