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PENSION AND POSTRETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total accumulated benefit obligation |  | $ 3,942 | $ 3,719 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, projected benefit obligation |  | 558 | 519 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, accumulated benefit obligation |  | 470 | 435 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, plan assets |  | 125 | 118 |
Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation |  | 515 | 469 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation |  | 452 | 413 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets |  | 92 | 77 |
Pension contribution |  | 38 | 43 | $ 43
Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  |  | 7 | 16
Defined contribution plan, expense |  |  | 14 | 32
Postretirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Future benefit payments, 2025 |  | 7 |  |
Future benefit payments, 2026 |  | 7 |  |
Future benefit payments, 2027 |  | 7 |  |
Future benefit payments, 2028 |  | 7 |  |
Future benefit payments, 2029 |  | 7 |  |
Total future benefit payments, 2030 - 2034 |  | 27 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 71 | 72 |
Deferred actuarial gains in accumulated other comprehensive income |  | 68 | 95 |
Pension income |  | 18 | 19 | 12
Benefits paid |  | 10 | 9 |
Private Equity Funds | Measured at NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments for private equity funds |  | $ 90 |  |
Period distributions of underlying assets are expected to occur |  | 10 years |  |
Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension contribution | $ 40 |  |  |
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ 14 | $ (2) | $ 121
Discount rate |  | 4.97% | 6.03% | 5.64%
Over (Under) funded plans |  | $ 800 |  |
Unfunded plans |  | 161 |  |
Future benefit payments, 2025 |  | 272 |  |
Future benefit payments, 2026 |  | 262 |  |
Future benefit payments, 2027 |  | 260 |  |
Future benefit payments, 2028 |  | 255 |  |
Future benefit payments, 2029 |  | 250 |  |
Total future benefit payments, 2030 - 2034 |  | 1,165 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 800 | $ 656 |
Pension income |  | 116 | 113 | $ 3
Benefits paid |  | 205 | 204 |
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ 107 | $ 98 | $ 57
Discount rate |  | 4.70% | 5.20% | 4.90%
Over (Under) funded plans |  | $ (38) |  |
Unfunded plans |  | 230 |  |
Future benefit payments, 2025 |  | 63 |  |
Future benefit payments, 2026 |  | 61 |  |
Future benefit payments, 2027 |  | 64 |  |
Future benefit payments, 2028 |  | 68 |  |
Future benefit payments, 2029 |  | 73 |  |
Total future benefit payments, 2030 - 2034 |  | 374 |  |
Benefit obligation, ending (recognized in balance sheet) |  | (38) | $ (62) |
Pension income |  | (37) | (49) | $ (5)
Benefits paid |  | $ 41 | $ 42 |

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