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Debt and Financing Arrangements - Net Financing Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Debt Disclosure [Abstract] |  |  |
Interest expense, net of capitalized interest costs | $ 191 | $ 186 | $ 161
Banking fees and debt issuance cost amortization | 18 | 20 | 22
Interest income | (28) | (22) | (9)
Premium paid on repurchase of debt | 0 | 7 | 38
Derivative loss on Yanfeng transaction | 0 | 0 | 3
Net foreign exchange | 8 | 4 | 0
Net financing charges | $ 189 | $ 195 | $ 215

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