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Derivative Instruments and Hedging Activities - Schedule of 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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (78)	$ (148)	$ 97	$ 1
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in AOCI	10	(2)	22	12
Interest rate contracts \| Derivatives designated as hedging instruments: \| Income Statement Location [Axis]: us-gaap:InterestExpenseNonoperating \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Reclassified from AOCI into Income	1	2	5	3
Commodity contracts \| Derivatives not designated as hedging instruments: \| Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(86)	(122)	84	14
Commodity contracts \| Derivatives not designated as hedging instruments: \| Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	2	(1)	(1)	(2)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Income Statement Location [Axis]: us-gaap:Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	0	1	0	(1)
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	1	(17)	5	(10)
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Income Statement Location [Axis]: us-gaap:OtherNonoperatingIncomeExpense
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 6	$ (26)	$ 14	$ (10)