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INCOME TAXES - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) divestiture | Sep. 30, 2023 USD ($) | Jun. 06, 2024 | May 31, 2023
Income Tax Contingency [Line Items] |  |  |  |  |
Number of small divestitures | divestiture |  | 2 |  |  |
Tax holiday expiration, percent | 60.00% |  |  |  |
Tax holiday expiration, term of expiration | 2 years |  |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 245 |  |  |  |
Unrecognized tax benefits, income tax penalties and interest expense (income) | 6 | $ 6 | $ 1 |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 46 | 27 |  |  |
Income taxes paid | 1,440 | $ 950 | 3,310 |  |
Net operating losses and tax credits, amount available to carry forward | $ 276 |  |  |  |
Net operating losses and tax credits, additional amount available to carry forward, term | 5 years |  |  |  |
Copeland |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Noncontrolling common equity interest | 40.00% | 40.00% |  | 40.00% | 40.00%
Copeland |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income taxes paid | $ 600 |  | $ 2,300 |  |

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