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PENSION AND POSTRETIREMENT PLANS - Schedule of Retirement Plans Expense (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | $ 50 | $ 17 | $ 25
Interest cost | 140 | 169 | 164
Expected return on plan assets | (252) | (259) | (247)
Net amortization and other | 22 | (43) | (55)
Net periodic pension expense (income) | (40) | (116) | (113)
Defined contribution plans | 140 | 130 | 111
Total retirement plans expense (income) | 100 | 14 | (2)
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | 22 | 20 | 20
Interest cost | 46 | 49 | 50
Expected return on plan assets | (43) | (38) | (39)
Net amortization and other | 3 | 6 | 18
Net periodic pension expense (income) | 28 | 37 | 49
Defined contribution plans | 67 | 70 | 49
Total retirement plans expense (income) | $ 95 | $ 107 | $ 98

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