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DEBT - Narrative (Details)	Mar. 18, 2024 CAD ($) financeCompany financialInstitution	Feb. 24, 2024 USD ($)	Feb. 23, 2024 USD ($) financeCompany financialInstitution	Feb. 16, 2024 USD ($)	Mar. 31, 2024 USD ($)
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		2,900,000,000
Syndicated Credit Facility | Used vehicle floor plan
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility		800,000,000
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
Facility drawn					$ 389,000,000
Mizuho Warehouse Facility | Securitization Facility
Debt Instrument [Line Items]
Credit facility, maximum borrowing facility				$ 750,000,000
Facility drawn					$ 247,000,000
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 | Canandian Overnight Repo Rate Average CORRA | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Bank Of Nova Scotia Credit Agreement | Canandian Overnight Repo Rate Average CORRA | 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
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
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 | 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 | 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 | Service loaner floor plan | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		1.20%
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 | JPM Warehouse Facility | Securitization Facility | SOFR | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.15%
Line of credit | JPM Warehouse Facility | Securitization Facility | SOFR | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			1.95%
Line of credit | Mizuho Warehouse Facility | Securitization Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.20%

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