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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Derivatives Not Designated as Hedging Instruments |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ 93 | $ (42)
Interest rate contracts | Interest expense |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in AOCI | 0 | 8
Loss Reclassified from AOCI into Income | (7) | (1)
Foreign currency contracts |  |
Derivative Instruments, Gain (Loss) |  |
Foreign currency contracts | (8) | (4)
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments | Other non-operating expense, net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | (20) | (11)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Revenues |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 3 | 2
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Cost of sales |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 103 | (33)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Operating and administrative expenses |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | 2 | 0
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Other operating income, net |  |
Derivative Instruments, Gain (Loss) |  |
Gain (Loss) Recognized in Income | $ 5 | $ 0

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