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PENSION AND POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2026 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension contribution |  | $ 46 | $ 38 | $ 43
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total accumulated benefit obligation |  | 3,769 | 3,942 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, projected benefit obligation |  | 567 | 558 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, accumulated benefit obligation |  | 473 | 470 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, plan assets |  | 130 | 125 |
Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation |  | 493 | 515 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation |  | 431 | 452 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets |  | 71 | 92 |
Postretirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Future benefit payments, 2026 |  | 6 |  |
Future benefit payments, 2027 |  | 6 |  |
Future benefit payments, 2028 |  | 6 |  |
Future benefit payments, 2029 |  | 6 |  |
Future benefit payments, 2030 |  | 6 |  |
Total future benefit payments, 2031 - 2035 |  | 23 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 61 | 71 |
Deferred actuarial gains in accumulated other comprehensive income |  | 59 | 68 |
Pension income |  | 11 | 18 | 19
Benefits paid |  | 8 | 10 |
Private Equity Funds | Measured at NAV | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments for private equity funds |  | $ 71 |  |
Period distributions of underlying assets are expected to occur |  | 10 years |  |
Forecast | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension contribution | $ 40 |  |  |
U.S. Plans | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ 100 | $ 14 | $ (2)
Discount rate |  | 5.27% | 4.97% | 6.03%
Over (Under) funded plans |  | $ 856 |  |
Unfunded plans |  | 161 |  |
Future benefit payments, 2026 |  | 265 |  |
Future benefit payments, 2027 |  | 263 |  |
Future benefit payments, 2028 |  | 258 |  |
Future benefit payments, 2029 |  | 254 |  |
Future benefit payments, 2030 |  | 248 |  |
Total future benefit payments, 2031 - 2035 |  | 1,148 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 856 | $ 800 |
Pension income |  | 40 | 116 | $ 113
Benefits paid |  | 227 | 205 |
Non-U.S. Plans | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ 95 | $ 107 | $ 98
Discount rate |  | 5.20% | 4.70% | 5.20%
Over (Under) funded plans |  | $ (65) |  |
Unfunded plans |  | 242 |  |
Future benefit payments, 2026 |  | 67 |  |
Future benefit payments, 2027 |  | 64 |  |
Future benefit payments, 2028 |  | 70 |  |
Future benefit payments, 2029 |  | 74 |  |
Future benefit payments, 2030 |  | 71 |  |
Total future benefit payments, 2031 - 2035 |  | 396 |  |
Benefit obligation, ending (recognized in balance sheet) |  | (65) | $ (38) |
Pension income |  | (28) | (37) | $ (49)
Benefits paid |  | $ 40 | $ 41 |
Discontinued Operations | Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  |  |  | 7
Defined contribution plan, expense |  |  |  | $ 14

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