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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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Derivatives not designated as hedging instruments:
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ 32	$ (337)	$ (134)	$ (1,688)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Loss Recognized in AOCI	17	(21)	(5)	(17)
Interest rate contracts \| Derivatives designated as hedging instruments: \| Interest expense \| Cash Flow Hedges:
Derivative Instruments, Gain (Loss)
Gain Reclassified from AOCI into Income	14	7	27	14
Foreign currency contracts \| Derivatives designated as hedging instruments: \| Net Investment Hedges:
Derivative Instruments, Gain (Loss)
Foreign currency contracts	8	(1)	(2)	(24)
Foreign currency contracts \| Derivatives not designated as hedging instruments: \| Other non-operating income (expense), net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	8	(2)	(8)	(34)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Revenues
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	(1)	6	1	10
Commodity contracts \| Derivatives not designated as hedging instruments: \| Cost of sales
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	26	(343)	(129)	(1,669)
Commodity contracts \| Derivatives not designated as hedging instruments: \| Other operating income, net
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in Income	$ (1)	$ 2	$ 2	$ 5