BUSINESS SEGMENTS - Depreciation & Amortization (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 424	$ 263	$ 846	$ 523
National Instruments
Segment Reporting Information [Line Items]
Amortization of intangible assets	141	107	280	212
Operating Segments | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	108	110	224	220
Operating Segments | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	305	147	600	291
Operating Segments | Final Control | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	39	45	79	90
Operating Segments | Measurement & Analytical | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	33	28	73	58
Operating Segments | Discrete Automation | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	21	22	43	43
Operating Segments | Safety & Productivity | Intelligent Devices
Segment Reporting Information [Line Items]
Depreciation and amortization	15	15	29	29
Operating Segments | Control Systems & Software | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	28	24	49	45
Operating Segments | Test & Measurement | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	153	0	304	0
Operating Segments | AspenTech | Software and Control
Segment Reporting Information [Line Items]
Depreciation and amortization	124	123	247	246
Corporate and other
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 11	$ 6	$ 22	$ 12