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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 78	$ (235)	$ (56)	$ (1,923)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Loss Recognized in AOCI	7	32	2	15
Interest rate contracts \| Derivatives designated as hedging instruments: \| Interest expense \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain Reclassified from AOCI into Income	13	14	40	28
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	2	(5)	0	(28)
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Other non-operating income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	1	(2)	(7)	(36)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	0	1	1	11
Commodity contracts \| Derivatives not designated as hedging instruments: \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	77	(224)	(52)	(1,893)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Other operating income, net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 0	$ (10)	$ 2	$ (5)