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Debt - Interest Expense, net (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Debt Disclosure [Abstract] |  |  |
Interest expense, net | $ 125 | $ 122 | $ 127
Long-term debt, weighted average interest rate, at point in time | 3.50% | 3.20% | 3.70%

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- Definition The net amount of nonoperating interest income (expense). + References No definition available. + Details
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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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