BUSINESS SEGMENTS - Depreciation & Amortization (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 383	$ 422
Operating Segments | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	107	116
Operating Segments | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	265	295
Operating Segments | Final Control | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	40	40
Operating Segments | Measurement & Analytical | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	31	40
Operating Segments | Discrete Automation | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	21	22
Operating Segments | Safety & Productivity | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	15	14
Operating Segments | Control Systems & Software | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	23	21
Operating Segments | Test & Measurement | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	118	151
Operating Segments | AspenTech | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	124	123
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 11	$ 11