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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		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (148)	$ 78	$ 1	$ (56)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in AOCI	(2)	7	12	2
Interest rate contracts \| Derivatives designated as hedging instruments: \| Interest expense \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Reclassified from AOCI into Income	2	13	3	40
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	(17)	2	(10)	0
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Other non-operating income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(26)	1	(10)	(7)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	1	0	(1)	1
Commodity contracts \| Derivatives not designated as hedging instruments: \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(122)	77	14	(52)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Other operating expense (income), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (1)	$ 0	$ (2)	$ 2