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FINANCIAL INSTRUMENTS - Additional Information (Details) € in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 EUR (€) | Jun. 30, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Sep. 30, 2019 EUR (€)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value of long-term debt compared with carrying value |  | $ 766 |  |
Collateral already posted, aggregate fair value |  | 0 |  |
Collateral held from counterparties |  | 0 |  |
Level 2 |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Fair value of long-term debt |  | 8,100 |  |
Senior Notes |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Debt, face amount | € |  |  |  | € 1,500
Repayments of debt | € | € 500 |  |  |
Senior Notes | Due March 2031 |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Debt, face amount | € |  |  | € 500 |
Notes interest rate, percentage |  |  | 3.00% |
Senior Notes | Due March 2037 |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Debt, face amount | € |  |  | € 500 |
Notes interest rate, percentage |  |  | 3.50% |
Foreign currency |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Notional amount of foreign currency hedge positions |  | $ 3,200 |  |

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