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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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