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Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total accumulated benefit obligation |  | $ 3,719 | $ 3,910 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, projected benefit obligation |  | 519 | 527 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, accumulated benefit obligation |  | 435 | 444 |
Defined benefit plan, pension plan with projected benefit obligation in excess of plan assets, plan assets |  | 118 | 102 |
Defined benefit plan, pension plan with accumulated benefit obligation in excess of plan assets, projected benefit obligation |  | 469 | 477 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation |  | 413 | 421 |
Defined benefit plan, plan with accumulated benefit obligation in excess of plan assets, plan assets |  | 77 | 63 |
Pension contribution |  | 43 | 43 | $ 41
Discontinued Operations |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | 7 | 16 | 21
Defined contribution plan, expense |  | 14 | 32 | 30
Postretirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Future benefit payments, 2024 |  | 8 |  |
Future benefit payments, 2025 |  | 8 |  |
Future benefit payments, 2026 |  | 8 |  |
Future benefit payments, 2027 |  | 8 |  |
Future benefit payments, 2028 |  | 8 |  |
Total future benefit payments, 2029 - 2033 |  | 29 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 72 | 83 |
Deferred actuarial gains in accumulated other comprehensive income |  | 95 | 112 |
Pension income |  | 19 | 12 | 15
Benefits paid |  | 9 | 10 |
Private Equity Funds | Measured at NAV |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unfunded commitments for private equity funds |  | $ 115 |  |
Period distributions of underlying assets are expected to occur |  | 10 years |  |
Forecast |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension contribution | $ 45 |  |  |
U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ (2) | $ 121 | $ 141
Discount rate |  | 6.03% | 5.64% | 2.92%
Over (Under) funded plans |  | $ 656 |  |
Unfunded plans |  | 159 |  |
Future benefit payments, 2024 |  | 222 |  |
Future benefit payments, 2025 |  | 226 |  |
Future benefit payments, 2026 |  | 229 |  |
Future benefit payments, 2027 |  | 230 |  |
Future benefit payments, 2028 |  | 231 |  |
Total future benefit payments, 2029 - 2033 |  | 1,142 |  |
Benefit obligation, ending (recognized in balance sheet) |  | 656 | $ 513 |
Pension income |  | 113 | 3 | $ (27)
Benefits paid |  | 204 | 204 |
Non-U.S. Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension expense (income) |  | $ 98 | $ 57 | $ 53
Discount rate |  | 5.20% | 4.90% | 2.20%
Over (Under) funded plans |  | $ (62) |  |
Unfunded plans |  | 213 |  |
Future benefit payments, 2024 |  | 62 |  |
Future benefit payments, 2025 |  | 58 |  |
Future benefit payments, 2026 |  | 61 |  |
Future benefit payments, 2027 |  | 63 |  |
Future benefit payments, 2028 |  | 69 |  |
Total future benefit payments, 2029 - 2033 |  | 358 |  |
Benefit obligation, ending (recognized in balance sheet) |  | (62) | $ (57) |
Pension income |  | (49) | (5) | $ (1)
Benefits paid |  | $ 42 | $ 40 |

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