FINANCIAL INSTRUMENTS - Schedule Of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	$ 20	$ (69)	$ 89
Gain (Loss) to OCI	$ (76)	$ (80)	$ 290
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]
Gain (Loss) to Earnings	$ 0	$ (19)	$ 12
Commodity | Cash Flow Hedging | Cost of sales | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	0	6	(20)
Commodity | Cash Flow Hedging | Other deductions, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	10	(128)	48
Foreign currency | Cash Flow Hedging | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	10	65	31
Foreign currency | Cash Flow Hedging | Cost of sales | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	(8)	42	53
Foreign currency | Cash Flow Hedging | Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	0	(3)	(2)
Foreign currency | Cash Flow Hedging | Sales | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	2	0	(9)
Foreign currency | Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to Earnings	0	16
Foreign currency | Net Investment Hedging | Other Comprehensive Income (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) to OCI	$ (70)	$ (128)	$ 266