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Debt and Financing Arrangements - Components of Net Financing Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Debt Disclosure [Abstract] |  |  |  |
Interest expense, net of capitalized interest costs | $ 79 | $ 54 | $ 219 | $ 165
Other financing charges | 13 | 6 | 34 | 16
Interest income | (10) | (2) | (17) | (5)
Net foreign exchange results for financing activities | (2) | (9) | (18) | (23)
Net financing charges | $ 80 | $ 49 | $ 218 | $ 153

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