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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, 2025 | Sep. 30, 2024
--- | --- | ---
Derivative Instruments [Line Items] |  |
Total assets | $ 15 | $ 22
Derivative liabilities | 3,631 | 3,450
Derivatives and Hedging Activities Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 15 | 21
Derivative liabilities | 3,617 | 3,449
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 14 | 19
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current assets | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 1 | 2
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | 9 | 24
Derivatives and Hedging Activities Designated as Hedging Instruments | Other current liabilities | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | 1 | 1
Derivatives and Hedging Activities Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | 3,607 | 3,424
Derivatives and Hedging Activities Not Designated as Hedging Instruments |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 1
Derivative liabilities | 14 | 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current assets | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current assets | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Total assets | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current liabilities | Foreign currency exchange derivatives |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | 14 | 1
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Other current liabilities | Commodity derivatives |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | 0 | 0
Derivatives and Hedging Activities Not Designated as Hedging Instruments | Long-term debt | Foreign currency denominated debt |  |
Derivative Instruments [Line Items] |  |
Derivative liabilities | $ 0 | $ 0

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