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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses Gross of Tax on Derivative Instruments and Related Hedge Items (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | $ (96) | $ 37 | $ (118)
Foreign currency exchange derivatives | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | (1) | (5) | (16)
Foreign currency exchange derivatives | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | (92) | 43 | (103)
Foreign currency exchange derivatives | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | (3) | (1) | 0
Interest rate swaps | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | 0 | 0 | 1
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 23 | (17) | 15
Amount of gain (loss) reclassified from AOCI into income | 12 | 1 | (12)
Cash Flow Hedging | Foreign currency exchange derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 20 | (1) | (13)
Amount of gain (loss) reclassified from AOCI into income | 10 | 1 | (4)
Cash Flow Hedging | Commodity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 3 | 5 | 1
Amount of gain (loss) reclassified from AOCI into income | 2 | 0 | (8)
Cash Flow Hedging | Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 0 | (21) | 27
Net Investment Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income | $ (159) | $ (173) | $ (223)

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