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Pension and Retirement Plans - Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Pension Plan |  |
Schedule Of Retirement Plans [Line Items] |  |
Accumulated benefit obligation | $ 1,758 | $ 331
Projected benefit obligation | 1,806 | 344
Fair value of plan assets | 1,595 | 149
Fair value of plan assets | 1,607 | 163
Postretirement Benefits |  |
Schedule Of Retirement Plans [Line Items] |  |
Projected benefit obligation | 48 | 56
Fair value of plan assets | $ 24 | $ 26

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- Definition Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 + Details
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