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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 ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2024 USD ($) | Apr. 12, 2023 $ / shares | Sep. 30, 2019 EUR (€)
Derivative [Line Items] |  |  |  |  |  |
Mark-to-market gain |  | $ 24 | $ (50) |  |  |
National Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Business acquisition, purchase price per share (in dollars per share) | $ / shares |  |  |  |  | $ 60 |
National Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Investments |  | 136 |  |  |  |
Mark-to-market gain |  | 56 |  |  |  |
Level 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of long-term debt |  | 6,900 |  | $ 7,000 |  |
Fair value of long term debt compared with carrying value, higher (lower) |  | $ 1,275 |  | (705) |  |
Senior Notes |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Debt, face amount | € |  |  |  |  |  | € 1,500
Repayments of debt | € | € 500 |  |  |  |  |
Foreign currency |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional value of hedge positions |  |  |  | $ 3,300 |  |

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