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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
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Derivatives Not Designated as Hedging Instruments: |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | $ (42) | $ (299) | $ 166
Derivatives Not Designated as Hedging Instruments: | Foreign currency contracts | Other non-operating (expense) income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (20) | 38 | 16
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | (32) | (344) | 155
Derivatives Not Designated as Hedging Instruments: | Commodity contracts | Revenues |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in Income | 10 | 7 | (5)
Cash Flow Hedges: |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | (53) |  |
Gain (Loss) Recognized in AOCI |  | (10) | 2
Gain (Loss) Reclassified from AOCI into Income | (13) |  |
Gain (Loss) Reclassified from AOCI into Income |  | (4) | (7)
Cash Flow Hedges: | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 0 |  |
Gain (Loss) Recognized in AOCI |  | 1 | 0
Cash Flow Hedges: | Foreign currency contracts | Cost of sales |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | 0 |  |
Gain (Loss) Reclassified from AOCI into Income |  | 2 | (3)
Cash Flow Hedges: | Cross-currency swaps |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | 0 |  |
Gain (Loss) Recognized in AOCI |  | 0 | 2
Cash Flow Hedges: | Cross-currency swaps | Interest expense /other operating income, net |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | 0 |  |
Gain (Loss) Reclassified from AOCI into Income |  | 0 | 1
Cash Flow Hedges: | Interest rate contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Recognized in AOCI | (53) |  |
Gain (Loss) Recognized in AOCI |  | (11) | 0
Cash Flow Hedges: | Interest rate contracts | Interest expense |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Gain (Loss) Reclassified from AOCI into Income | (13) |  |
Gain (Loss) Reclassified from AOCI into Income |  | (6) | (5)
Net Investment Hedges: | Foreign currency contracts |  |  |
Derivative Instruments, Gain (Loss) |  |  |
Foreign currency contracts | $ (1) |  |
Foreign currency contracts |  | $ 17 | $ 0

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