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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 | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | $ 58 | $ 60 | $ (94) | $ 12
Foreign currency exchange derivatives | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | (1) | 2 | (8) | (3)
Foreign currency exchange derivatives | Net financing charges |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | 60 | 59 | (84) | 16
Foreign currency exchange derivatives | Selling, general and administrative |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in income on derivative | (1) | (1) | (2) | (1)
Cash Flow Hedging |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 4 | 29 | 18 | (18)
Amount of gain (loss) reclassified from AOCI into income | 1 | (3) | 2 | (7)
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 | (2) | 15 | 15 | 2
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 | 2 | (2) | 3 | (3)
Cash Flow Hedging | Commodity derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 6 | 0 | 3 | 1
Cash Flow Hedging | Commodity derivatives | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) reclassified from AOCI into income | (1) | (1) | (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 | 14 | 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 | $ (131) | $ 98 | $ 107 | $ (47)

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