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Retirement Plans - Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Pension Plan |  |
Schedule Of Retirement Plans [Line Items] |  |
Accumulated benefit obligation | $ 1,834 | $ 2,004
Projected benefit obligation | 1,846 | 2,013
Fair value of plan assets | 1,618 | 1,720
Fair value of plan assets | 1,633 | 1,729
Postretirement Benefits |  |
Schedule Of Retirement Plans [Line Items] |  |
Projected benefit obligation | 58 | 68
Fair value of plan assets | $ 24 | $ 28

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