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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Derivatives Not Designated as Hedging Instruments: |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | $ (1,781) | $ 1,236 | $ 1,542
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Revenues |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 11 | (9) | (17)
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (1,771) | 1,181 | 1,545
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Other operating income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 2 | 1 | 5
Derivatives Not Designated as Hedging Instruments: | Foreign currency contracts | Other non-operating (expense) income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (23) | 63 | 9
Cash Flow Hedges: | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 25 | 91 | 4
Cash Flow Hedges: | Interest rate contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | 40 | (7) | (25)
Net Investment Hedges: | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Foreign currency contracts | $ (21) | $ 69 | $ 4

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