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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		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 57	$ 32	$ 149	$ (134)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in AOCI	(6)	17	14	(5)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Interest expense \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain (Loss) Reclassified from AOCI into Income	(1)	14	1	27
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	(6)	8	7	(2)
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Other non-operating income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(9)	8	16	(8)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(1)	(1)	(2)	1
Commodity contracts \| Derivatives not designated as hedging instruments: \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	67	26	136	(129)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Other operating expense (income), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 0	$ (1)	$ (1)	$ 2