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Retirement Plans - Narratives (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Pension plan, projected benefit obligation (ABO) | $ 162 | $ 155 |
Pension plan, accumulated benefit obligation (ABO) | 144 | 137 |
Pension plan, fair value of plan assets (ABO) | 52 | 48 |
Pension plan, projected benefit obligation (PBO) | 162 | 155 |
Pension plan, accumulated benefit obligation (PBO) | 144 | 137 |
Pension plan, fair value of plan assets (PBO) | 52 | 48 |
Amounts in AOCI | 2 | 2 |
Pension plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Defined benefit plan, contributions | 20 | 17 |
Expected contributions in the next fiscal year | 10 |  |
Savings and investment plans |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Contribution expense | $ 38 | $ 46 | $ 23

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