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Benefit Plans Projected Benefit Obligations and Accumulated Benefit Obligations in Exess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions | Sep. 30, 2023 | Sep. 30, 2022
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Defined Benefit Plan Disclosure |  |
Accumulated benefit obligation | $ 10,069 | $ 10,508
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets | 8,129 | 8,094
Fair value of net plan assets | $ 8,094 | $ 9,110

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