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Debt - Interest Expense, net (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Debt Disclosure [Abstract] |  |  |
Interest expense, net | $ 162 | $ 161 | $ 141
Interest expense, debt | $ 177 | $ 182 | $ 157
Weighted-average interest rate of total debt | 4.10% | 4.30% | 4.10%

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