DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 13, 2024	Jun. 06, 2024	May 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net of tax of $13, $—, $22 and $—, respectively				$ 0	$ (46)	$ 0	$ (73)
Income taxes paid related to gain on divestitures, subsidiary restructurings and transaction fees						$ 585
Copeland
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, ownership percentage by parent		40.00%	40.00%
Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Other deductions, net					59		95
Equity method losses					(59)		(95)
Discontinued operations, net of tax of $13, $—, $22 and $—, respectively					$ (46)		$ (73)
Copeland
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of equity method investments		$ 1,500
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Climate Technologies (excluding Therm-O-Disc)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price			$ 14,000
Proceeds from notes receivable			$ 2,250
Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations | Copeland
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of equity method investments	$ 1,500
Pretax gain								$ 539
Gain on sale of business, net of tax								$ 435