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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | $ (118) | $ 90 | $ 193
Foreign currency exchange derivatives | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | (16) | 10 | (6)
Foreign currency exchange derivatives | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | (103) | 85 | 174
Foreign currency exchange derivatives | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | 0 | 0 | (2)
Foreign currency exchange derivatives | Income tax provision |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | 0 | 0 | (1)
Interest rate swaps | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | 1 | 0 | 0
Equity swap | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of gain (loss) recognized in income on derivative | 0 | (5) | 28
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 15 | 21 | (2)
Amount of gain (loss) reclassified from AOCI into income | (12) | 16 | 14
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 | (13) | 26 | 15
Amount of gain (loss) reclassified from AOCI into income | (4) | 25 | 11
Cash Flow Hedging | Commodity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Other comprehensive income (loss), cash flow hedge, gain (loss), before reclassification and tax | 1 | (21) | 4
Amount of gain (loss) reclassified from AOCI into income | (8) | (7) | 3
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 | 27 | 16 | (21)
Amount of gain (loss) reclassified from AOCI into income | $ 0 | $ (2) | $ 0

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