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Debt - Interest Expense, net (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Debt Disclosure [Abstract] |  |  |
Interest expense, net | $ 141 | $ 125 | $ 122
Interest expense, debt | $ 157 | $ 125 | $ 119
Long-term debt, weighted average interest rate, at point in time | 4.10% | 3.50% | 3.20%

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