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
Dec. 31, 2023	Dec. 31, 2022
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (166)	$ (1,351)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in AOCI	(22)	4
Interest rate contracts \| Derivatives designated as hedging instruments: \| Interest expense \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain Reclassified from AOCI into Income	13	7
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	(10)	(23)
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Other non-operating expense, net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(16)	(32)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	2	4
Commodity contracts \| Derivatives not designated as hedging instruments: \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(155)	(1,326)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Other operating income, net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 3	$ 3

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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