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Pension and Retirement Plans - Accumulated Benefit Obligations and Reconciliations of Changes in Projected Benefit Obligation, Changes in Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Pension Plan | United States |  |  |
Retirement Plans [Line Items] |  |  |
Accumulated Benefit Obligation | $ 1,473 | $ 1,603 |
Change in Projected Benefit Obligation |  |  |
Projected benefit obligation at beginning of year | 1,603 | 1,564 |
Service cost | 0 | 0 | $ 0
Interest cost | 65 | 79 | 78
Plan participant contributions | 0 | 0 |
Actuarial loss (gain) | (62) | 104 |
Benefits and settlements paid | (133) | (144) |
Divestitures | 0 | 0 |
Other | 0 | 0 |
Currency translation adjustment | 0 | 0 |
Projected benefit obligation at end of year | 1,473 | 1,603 | 1,564
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 1,591 | 1,499 |
Actual return on plan assets | (12) | 234 |
Employer and employee contributions | 2 | 2 |
Divestitures | 0 | 0 |
Other | 0 | 0 |
Currency translation adjustment | 0 | 0 |
Fair value of plan assets at end of year | 1,448 | 1,591 | 1,499
Funded status | (25) | (12) |
Net amount recognized | $ (25) | $ (12) |
Weighted Average Assumptions |  |  |
Discount rate | 4.98% | 4.60% |
Pension Plan | United States | Other noncurrent assets |  |  |
Change in Plan Assets |  |  |
Assets | $ 1 | $ 2 |
Pension Plan | United States | Noncurrent assets held for sale |  |  |
Change in Plan Assets |  |  |
Assets | 0 | 0 |
Pension Plan | United States | Accrued compensation and benefits |  |  |
Change in Plan Assets |  |  |
Liabilities | (2) | (2) |
Pension Plan | United States | Pension and postretirement benefit obligations |  |  |
Change in Plan Assets |  |  |
Liabilities | (24) | (12) |
Pension Plan | United States | Noncurrent liabilities held for sale |  |  |
Change in Plan Assets |  |  |
Liabilities | 0 | 0 |
Pension Plan | Foreign Plan |  |  |
Retirement Plans [Line Items] |  |  |
Accumulated Benefit Obligation | 1,335 | 1,563 |
Change in Projected Benefit Obligation |  |  |
Projected benefit obligation at beginning of year | 1,617 | 1,473 |
Service cost | 17 | 17 | 16
Interest cost | 64 | 69 | 68
Plan participant contributions | 3 | 3 |
Actuarial loss (gain) | (111) | 84 |
Benefits and settlements paid | (96) | (132) |
Divestitures | (131) | (5) |
Other | (3) | 2 |
Currency translation adjustment | 14 | (106) |
Projected benefit obligation at end of year | 1,374 | 1,617 | 1,473
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 1,525 | 1,388 |
Actual return on plan assets | (25) | 137 |
Employer and employee contributions | 32 | 26 |
Divestitures | (168) | 0 |
Other | (2) | 1 |
Currency translation adjustment | 8 | 105 |
Fair value of plan assets at end of year | 1,274 | 1,525 | 1,388
Funded status | (100) | (92) |
Net amount recognized | $ (100) | $ (92) |
Weighted Average Assumptions |  |  |
Discount rate | 5.17% | 4.35% |
Rate of compensation increase | 2.91% | 3.01% |
Interest crediting rate | 1.75% | 1.58% |
Pension Plan | Foreign Plan | Other noncurrent assets |  |  |
Change in Plan Assets |  |  |
Assets | $ 72 | $ 62 |
Pension Plan | Foreign Plan | Noncurrent assets held for sale |  |  |
Change in Plan Assets |  |  |
Assets | 0 | 52 |
Pension Plan | Foreign Plan | Accrued compensation and benefits |  |  |
Change in Plan Assets |  |  |
Liabilities | (12) | (12) |
Pension Plan | Foreign Plan | Pension and postretirement benefit obligations |  |  |
Change in Plan Assets |  |  |
Liabilities | (157) | (166) |
Pension Plan | Foreign Plan | Noncurrent liabilities held for sale |  |  |
Change in Plan Assets |  |  |
Liabilities | (3) | (28) |
Postretirement Benefits |  |  |
Retirement Plans [Line Items] |  |  |
Accumulated Benefit Obligation | 63 | 73 |
Change in Projected Benefit Obligation |  |  |
Projected benefit obligation at beginning of year | 73 | 77 |
Service cost | 0 | 0 | 0
Interest cost | 3 | 4 | 4
Plan participant contributions | 1 | 2 |
Actuarial loss (gain) | (5) | 4 |
Benefits and settlements paid | (9) | (13) |
Divestitures | 0 | 0 |
Other | 0 | (1) |
Currency translation adjustment | 0 | 0 |
Projected benefit obligation at end of year | 63 | 73 | 77
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 161 | 144 |
Actual return on plan assets | 20 | 26 |
Employer and employee contributions | 3 | 4 |
Divestitures | 0 | 0 |
Other | 0 | 0 |
Currency translation adjustment | 0 | 0 |
Fair value of plan assets at end of year | 175 | 161 | $ 144
Funded status | 112 | 88 |
Net amount recognized | $ 112 | $ 88 |
Weighted Average Assumptions |  |  |
Discount rate | 4.77% | 4.50% |
Postretirement Benefits | Other noncurrent assets |  |  |
Change in Plan Assets |  |  |
Assets | $ 136 | $ 118 |
Postretirement Benefits | Noncurrent assets held for sale |  |  |
Change in Plan Assets |  |  |
Assets | 0 | 0 |
Postretirement Benefits | Accrued compensation and benefits |  |  |
Change in Plan Assets |  |  |
Liabilities | (2) | (2) |
Postretirement Benefits | Pension and postretirement benefit obligations |  |  |
Change in Plan Assets |  |  |
Liabilities | (22) | (28) |
Postretirement Benefits | Noncurrent liabilities held for sale |  |  |
Change in Plan Assets |  |  |
Liabilities | $ 0 | $ 0 |

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