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Derivative Instruments and Hedging Activities - Location and Fair Values of Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Derivative Instruments [Line Items] |  |
Total assets | $ 22 | $ 56
Total liabilities | 3,450 | 3,280
Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 21 | 43
Total liabilities | 3,449 | 3,275
Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 19 | 16
Designated as Hedging Instruments | Other current assets | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 2 | 0
Designated as Hedging Instruments | Other current assets | Interest rate swaps |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 22
Designated as Hedging Instruments | Other noncurrent assets | Cross-currency interest rate swap |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 5
Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 24 | 20
Designated as Hedging Instruments | Other current liabilities | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 1 | 2
Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 3,424 | 3,253
Not Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 1 | 13
Total liabilities | 1 | 5
Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 1 | 13
Not Designated as Hedging Instruments | Other current assets | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 0
Not Designated as Hedging Instruments | Other current assets | Interest rate swaps |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 0
Not Designated as Hedging Instruments | Other noncurrent assets | Cross-currency interest rate swap |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 0
Not Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 1 | 5
Not Designated as Hedging Instruments | Other current liabilities | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 0 | 0
Not Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt |  |
Derivative Instruments [Line Items] |  |
Total liabilities | $ 0 | $ 0

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