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FINANCIAL INSTRUMENTS - Additional Information (Details) € in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 EUR (€) | Sep. 30, 2019 EUR (€) | Mar. 31, 2025 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Fair value of long-term debt compared with carrying value |  |  | $ 834
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 |  |  | $ 8,400
Senior Notes |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt, face amount | € | € 500 | € 1,500 |
Repayments of debt | € | 500 | € 500 |
Senior Notes | Due March 2031 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt, face amount | € | € 500 |  |
Notes interest rate, percentage | 3.00% |  | 3.00%
Senior Notes | Due March 2037 |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt, face amount | € | € 500 |  |
Notes interest rate, percentage | 3.50% |  | 3.50%
Foreign Exchange Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional amount of foreign currency hedge positions |  |  | $ 3,800

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