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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, 2023 | Sep. 30, 2022
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Derivative Instruments [Line Items] |  |
Total assets | $ 56 | $ 54
Total liabilities | 3,280 | 3,138
Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 43 | 30
Total liabilities | 3,275 | 3,111
Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 16 | 30
Designated as Hedging Instruments | Other current assets | Interest rate swaps |  |
Derivative Instruments [Line Items] |  |
Total assets | 22 | 0
Designated as Hedging Instruments | Other noncurrent assets | Cross-currency interest rate swap |  |
Derivative Instruments [Line Items] |  |
Total assets | 5 | 0
Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 20 | 24
Designated as Hedging Instruments | Other current liabilities | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 2 | 10
Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt |  |
Derivative Instruments [Line Items] |  |
Total liabilities | 3,253 | 3,077
Not Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 13 | 24
Total liabilities | 5 | 27
Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 13 | 24
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 | 5 | 27
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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