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Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
ABO | $ 24 | $ 21 |
Fair value of plan assets | 22 | 18 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | 19 | 19 |
Defined benefit plan, benefit obligation | 707 | 623 | $ 633
Supplemental Employee Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, benefit obligation | 40 | 34 |
Consolidated balance sheets | 31 | 26 |
U.S. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution made to Pension Plan | $ 18 | $ 18 | $ 14

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