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Pension and Retirement Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2025 USD ($) plan | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Retirement Plans [Line Items] |  |  |
Total employer contributions to defined benefit plans | $ 31 |  |
Estimated future employer contributions to defined benefit plans in next fiscal year | 21 |  |
Voluntary contributions made by the company to defined benefit plans | 0 |  |
Matching contributions charged to expense for defined contribution savings plans | $ 192 | $ 208 | $ 209
Number of multiemployer benefit plans in which the Company participates | plan | 245 |  |
Multiemployer plan, employer contribution, cost | $ 86 | $ 80 | $ 67

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