FINANCIAL INSTRUMENTS - Schedule Of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total gains included in earnings	$ (2)	$ 20	$ (69)
Total gains included in other comprehensive income	$ (149)	$ (76)	$ (80)
Derivative Gain Loss Statement Of Income Or Comprehensive Income, Extensible Enumeration Not Disclosed, Flag	Total	Total	Total
Commodity | Cash Flow Hedging | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	$ 0	$ 0	$ (19)
Gains (losses) included in other comprehensive income	0	0	6
Foreign currency | Cash Flow Hedging | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	1	10	65
Gains (losses) included in other comprehensive income	25	(8)	42
Foreign currency | Cash Flow Hedging | Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	5	0	(3)
Gains (losses) included in other comprehensive income	7	2	0
Foreign currency | Cash Flow Hedging | Other deductions, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	(8)	10	(128)
Foreign currency | Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Net investment hedges included in earnings	0	0	16
Net investment hedges included in other comprehensive income	$ (181)	$ (70)	$ (128)