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DEBT - Narrative (Details) € in Millions |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2027 | Aug. 01, 2025 USD ($) | Apr. 01, 2025 EUR (€) | Feb. 23, 2024 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 10, 2025 USD ($) | Aug. 06, 2025 USD ($) financialInstitution financeCompany
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of non-recourse notes payable |  |  |  |  | $ 1,095,300,000 | $ 739,000,000.0 |  |
Asset Backed Funding Vehicles | Non-recourse |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of non-recourse notes payable |  |  |  |  | 1,100,000,000 |  |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 2,350,000,000 |  |  |
Syndicated Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 6,500,000,000
Syndicated Credit Facility | New vehicle floor plan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | 3,000,000,000
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 |  |  |  |  |  |  |  | $ 2,500,000,000
Option to reallocate commitment, maximum aggregate commitment threshold (as a percent) |  |  |  |  |  |  |  | 50.00%
Syndicated Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution |  |  |  |  |  |  |  | 20
Debt instrument, number of manufacturer-affiliated finance companies | financeCompany |  |  |  |  |  |  |  | 7
Basis spread on variable rate (as a percent) |  |  |  | 0.10% |  |  |  |
Syndicated Credit Facility | Line of Credit | New vehicle floor plan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.10% |  |  |  |
Syndicated Credit Facility | Line of Credit | Used vehicle floor plan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.40% |  |  |  |
Syndicated Credit Facility | Line of Credit | Service loaner floor plan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.20% |  |  |  |
Syndicated Credit Facility | Line of Credit | Revolving line of credit | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.00% |  |  |  |
Syndicated Credit Facility | Line of Credit | Revolving line of credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 2.00% |  |  |  |
Syndicated Credit Facility, Upon Expansion of Original Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  |  |  |  |  |  |  | $ 7,000,000,000
Mizuho Warehouse Facility | Securitization facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility |  | $ 1,000,000,000.0 |  |  |  |  |  |
Mizuho Warehouse Facility | Line of Credit | Securitization facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 0.85% |  |  |  |  |  |
Bank of America Credit Facility | Revolving line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility, maximum borrowing facility | € |  |  | € 150.0 |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 1.45% |  |  |  |  |
5.500% Senior notes due 2030 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 600,000,000.0 |
Debt stated interest rate (as a percent) |  |  |  |  | 5.50% |  | 5.50% |
Debt redemption price, percentage of principal amount redeemed |  |  |  |  | 105.50% |  |  |
Redemption percentage price (percent) |  |  |  |  | 40.00% |  |  |
5.500% Senior notes due 2030 | Senior Notes | Forecast |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt redemption price, percentage of principal amount redeemed | 40.00% |  |  |  |  |  |  |
Redemption percentage price (percent) | 105.50% |  |  |  |  |  |  |

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