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Debt - Summary of Interest Costs and Payments (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Debt Disclosure [Abstract] |  |  |
Charged to operations | $ 613 | $ 528 | $ 452
Capitalized | 62 | 57 | 51
Total interest costs | 675 | 584 | 503
Interest paid, net of amounts capitalized | $ 628 | $ 473 | $ 452

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