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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, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | $ 193 | $ 82 | $ (3)
Foreign currency exchange derivatives | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | (6) | (1) | (8)
Foreign currency exchange derivatives | Net financing charges |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 174 | 87 | (60)
Foreign currency exchange derivatives | Income tax provision |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | (1) | 0 | (1)
Foreign currency exchange derivatives | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | (2) | 0 | 0
Foreign currency exchange derivatives | Discontinued Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 0 | 0 | 52
Equity swap | Selling, general and administrative |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Recognized in Income on Derivative | 28 | (4) | 14
Cash Flow Hedging |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gains (losses) recorded in other comprehensive income | (2) | 7 | (2)
Amount of Gain (Loss) Reclassified from AOCI into Income | 14 | (3) | (10)
Cash Flow Hedging | Foreign currency exchange derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gains (losses) recorded in other comprehensive income | 15 | 1 | 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 | 11 | (5) | 4
Cash Flow Hedging | Commodity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gains (losses) recorded in other comprehensive income | 4 | 6 | (4)
Cash Flow Hedging | Commodity derivatives | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | 3 | 2 | (4)
Cash Flow Hedging | Commodity derivatives | Discontinued Operations |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Amount of Gain (Loss) Reclassified from AOCI into Income | 0 | 0 | (10)
Cash Flow Hedging | Interest rate swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Pre-tax gains (losses) recorded in other comprehensive income | $ (21) | $ 0 | $ 0

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