FINANCIAL INSTRUMENTS - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Total gains included in earnings	$ 9	$ 20	$ 6	$ (30)
Total gains included in other comprehensive income	29	(73)	57	11
Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Net investment hedges included in earnings	0	0	0	0
Net investment hedges included in other comprehensive income	21	(75)	33	(5)
Foreign Exchange Contract \| Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	2	2	3	3
Gains (losses) included in other comprehensive income	3	0	7	11
Foreign Exchange Contract \| Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	7	0	12	0
Gains (losses) included in other comprehensive income	5	2	17	5
Foreign Exchange Contract \| Other deductions, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) included in earnings	$ 0	$ 18	$ (9)	$ (33)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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