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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Derivative [Line Items] |  |
Total assets | $ 26 | $ 22
Total liabilities | 3,378 | 3,450
Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 26 | 21
Total liabilities | 3,352 | 3,449
Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 1
Total liabilities | 26 | 1
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 22 | 19
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 1
Other current assets | Commodity derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 4 | 2
Other current assets | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 0
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 10 | 24
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 26 | 1
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 0 | 1
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 0 | 0
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 3,342 | 3,424
Long-term debt | Foreign currency denominated debt | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | $ 0 | $ 0

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