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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Derivative [Line Items] |  |
Total assets | $ 29 | $ 56
Total liabilities | 3,275 | 3,280
Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 27 | 43
Total liabilities | 3,275 | 3,275
Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 2 | 13
Total liabilities | 0 | 5
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 11 | 16
Other current assets | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 2 | 13
Other current assets | Interest rate swaps | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 22
Other current assets | Interest rate swaps | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 0
Other current assets | Commodity derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 3 | 0
Other current assets | Commodity derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 0 | 0
Other noncurrent assets | Cross-currency interest rate swap | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total assets | 13 | 5
Other noncurrent assets | Cross-currency interest rate swap | 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 | 20
Other current liabilities | Foreign currency exchange derivatives | Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 0 | 5
Other current liabilities | Commodity derivatives | Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative [Line Items] |  |
Total liabilities | 1 | 2
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 | 3,264 | 3,253
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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