ACQUISITIONS AND DIVESTITURES (Details) - USD ($) $ in Millions			3 Months Ended
	Mar. 12, 2025	Nov. 15, 2024	Dec. 31, 2025	Dec. 31, 2024	Sep. 30, 2025
Business Combination [Line Items]
Purchase price of businesses, net of cash acquired			$ 0	$ 37
Goodwill			$ 18,182		$ 18,193
AspenTech
Business Combination [Line Items]
Payments to acquire businesses, gross	$ 7,200
Business combination, accrued deal fees	76
Business combination, accrued deal fees, net of tax	65
Settlement of AspenTech share awards	76
Business combination, deal and transaction fees	127
Business combination, deal and transaction fees, net of tax	$ 113
Open Grid Systems Limited
Business Combination [Line Items]
Purchase price of businesses, net of cash acquired		$ 46
Goodwill		32
Goodwill expected tax deductible amount		0
Intangible assets		$ 20
Intangible assets, weighted average useful life		5 years