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v3.25.3

Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |
ABO | $ 21 | $ 24 |
Fair value of plan assets | 25 | 22 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | 15 | 19 |
Defined benefit plan, benefit obligation | 692 | 707 | $ 623
Payments for defined benefit retirement plan | 38 | 37 |
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, benefit obligation | 26 | 40 |
Payments for defined benefit retirement plan | 16 | 0 | 0
Consolidated balance sheets | 23 | 31 |
Other Pension, Postretirement and Supplemental Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Consolidated balance sheets | 8 | 8 |
Costs of benefits under savings plans | 24 | 23 | 22
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | 13 | $ 18 | $ 18
Expected future employer contributions to pension plan | $ 18 |  |

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