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FINANCIAL INSTRUMENTS - Narrative (Details) $ / shares in Units, € in Millions, $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 EUR (€) | Sep. 30, 2023 USD ($) | Sep. 30, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Sep. 30, 2024 USD ($) | Apr. 12, 2023 $ / shares | Sep. 30, 2019 EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |
Mark-to-market gain |  | $ 24 |  |  |  |  |
Level 2 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of long-term debt |  |  | $ 8,200 |  | $ 7,000 |  |
Fair value of long term debt compared with carrying value |  |  | 693 |  | $ 705 |  |
National Instruments |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Business acquisition, purchase price per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 60 |
National Instruments |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Mark-to-market gain |  | $ 56 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt, face amount | € |  |  |  |  |  |  | € 1,500
Repayments of debt | € | € 500 |  |  |  |  |  |
Senior Notes | Three Point Zero Percentage Due Two Thousand Thirty One |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt, face amount | € |  |  |  | € 500 |  |  |
Notes interest rate, percentage |  |  |  | 3.00% |  |  |
Senior Notes | Three Point Five Percentage Due Two Thousand Thirty Siven |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Debt, face amount | € |  |  |  | € 500 |  |  |
Notes interest rate, percentage |  |  |  | 3.50% |  |  |
Foreign currency |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional value of hedge positions |  |  | $ 4,100 |  |  |  |

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