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Derivative Instruments and Hedging Activities - Location and Amount of Gains and Losses on Derivative Instruments and Related Hedge Items (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | $ 72 | $ 18 | $ (22) | $ 31
Foreign currency exchange derivatives | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | 0 | (4) | (8) | (7)
Foreign currency exchange derivatives | Net financing charges |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | 71 | 20 | (13) | 36
Foreign currency exchange derivatives | Selling, general and administrative |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | 1 | 2 | (1) | 2
Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 0 | 6 | 18 | (12)
Amount of gain (loss) reclassified from AOCI into income | 6 | 4 | 8 | (3)
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 | 0 | 2 | 15 | 4
Cash Flow Hedging | Foreign currency exchange derivatives | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | 4 | 4 | 7 | 1
Cash Flow Hedging | Commodity derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 0 | 4 | 3 | 5
Cash Flow Hedging | Commodity derivatives | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | 2 | 0 | 1 | (4)
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 | 0 | 0 | (21)
Net Investment Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income | $ (269) | $ 44 | $ (162) | $ (3)

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