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OTHER FINANCIAL INFORMATION - Schedule of Other Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Other Financial Information [Abstract] |  |
Deferred income taxes | $ 1,914 | $ 2,138
Operating lease liabilities (noncurrent) | 488 | 511
Pension and postretirement liabilities | $ 464 | $ 466

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