BUSINESS SEGMENTS - Depreciation & Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 417	$ 257	$ 1,263	$ 780
National Instruments
Segment Reporting Information [Line Items]
Amortization of intangible assets	139	105	419	317
Operating Segments | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	109	100	333	320
Operating Segments | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	298	145	898	436
Operating Segments | Final Control | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	41	39	120	129
Operating Segments | Measurement & Analytical | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	32	26	105	84
Operating Segments | Discrete Automation | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	22	20	65	63
Operating Segments | Safety & Productivity | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	14	15	43	44
Operating Segments | Control Systems & Software | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	26	22	75	67
Operating Segments | Test & Measurement | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	150	0	454	0
Operating Segments | AspenTech | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	122	123	369	369
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 10	$ 12	$ 32	$ 24