INCOME TAXES - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) divestiture	Sep. 30, 2023 USD ($)	Jun. 06, 2024	May 31, 2023
Income Tax Contingency [Line Items]
Number of small divestitures | divestiture		2
Tax holiday expiration, percent	60.00%
Tax holiday expiration, term of expiration	2 years
Unrecognized tax benefits that would impact effective tax rate	$ 245
Unrecognized tax benefits, income tax penalties and interest expense (income)	6	$ 6	$ 1
Unrecognized tax benefits, income tax penalties and interest accrued	46	27
Income taxes paid	1,440	$ 950	3,310
Net operating losses and tax credits, amount available to carry forward	$ 276
Net operating losses and tax credits, additional amount available to carry forward, term	5 years
Copeland
Income Tax Contingency [Line Items]
Noncontrolling common equity interest	40.00%	40.00%		40.00%	40.00%
Copeland
Income Tax Contingency [Line Items]
Income taxes paid	$ 600		$ 2,300