EQUITY METHOD INVESTMENT AND NOTE RECEIVABLE - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended
	Jun. 06, 2024	May 31, 2023	Aug. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Schedule of Equity Method Investments [Line Items]
Interest income				$ 150	$ 148	$ 227
Loss on Copeland note receivable				0	279	0
Loss on Copeland note receivable, after-tax					$ 217
Loss from equity method investment (in dollars per share)					$ 0.38
Related Party
Schedule of Equity Method Investments [Line Items]
Proceeds from related party note receivable				0	$ 0	918
Payment of related party note payable				$ 0	0	918
Copeland
Schedule of Equity Method Investments [Line Items]
Equity method investment		$ 1,359
Notes receivable		$ 2,052
Proceeds from related party note receivable						918
Payment of related party note payable						918
Copeland | Related Party
Schedule of Equity Method Investments [Line Items]
Interest income					$ 86	$ 41
Copeland
Schedule of Equity Method Investments [Line Items]
Noncontrolling common equity interest	40.00%	40.00%		40.00%	40.00%
Copeland
Schedule of Equity Method Investments [Line Items]
Pre-tax cash proceeds from divestiture of business		$ 9,700			$ 1,500
Notes receivable, consideration		$ 2,250			$ 1,900
Proceeds from sale of equity method investments	$ 1,500		$ 1,500
Proceeds from sale of notes receivable			$ 1,900