BUSINESS SEGMENTS INFORMATION - Financial Information by Geographic Area (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	$ 17,560	$ 15,236	$ 13,890
Property, Plant and Equipment	2,807	2,363	2,239
Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	8,798	7,808	7,041
Property, Plant and Equipment	1,672	1,442	1,373
AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	5,318	4,597	4,260
Property, Plant and Equipment	542	428	398
Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	3,444	2,831	2,589
Property, Plant and Equipment	593	493	468
Intelligent Devices
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	12,161	11,588	10,836
Intelligent Devices | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	6,282	6,079	5,509
Intelligent Devices | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	3,748	3,493	3,375
Intelligent Devices | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,131	2,016	1,952
Intelligent Devices | Operating Segments | Final Control
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	4,204	3,970	3,607
Intelligent Devices | Operating Segments | Final Control | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,010	1,949	1,706
Intelligent Devices | Operating Segments | Final Control | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,647	1,481	1,373
Intelligent Devices | Operating Segments | Final Control | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	547	540	528
Intelligent Devices | Operating Segments | Measurement & Analytical
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	4,061	3,595	3,215
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,046	1,847	1,529
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,382	1,222	1,199
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	633	526	487
Intelligent Devices | Operating Segments | Discrete Automation
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,506	2,635	2,612
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,178	1,234	1,217
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	646	720	732
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	682	681	663
Intelligent Devices | Operating Segments | Safety & Productivity
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,390	1,388	1,402
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,048	1,049	1,057
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	73	70	71
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	269	269	274
Software and Control
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	5,399	3,648	3,054
Software and Control | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,516	1,729	1,532
Software and Control | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,570	1,104	885
Software and Control | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,313	815	637
Software and Control | Operating Segments | Control Systems & Software
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	2,842	2,606	2,398
Software and Control | Operating Segments | Control Systems & Software | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,322	1,259	1,170
Software and Control | Operating Segments | Control Systems & Software | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	920	818	745
Software and Control | Operating Segments | Control Systems & Software | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	600	529	483
Software and Control | Operating Segments | Test & Measurement
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,464	0	0
Software and Control | Operating Segments | Test & Measurement | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	654	0	0
Software and Control | Operating Segments | Test & Measurement | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	389	0	0
Software and Control | Operating Segments | Test & Measurement | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	421	0	0
Software and Control | Operating Segments | AspenTech
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	1,093	1,042	656
Software and Control | Operating Segments | AspenTech | Americas
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	540	470	362
Software and Control | Operating Segments | AspenTech | AMEA
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	261	286	140
Software and Control | Operating Segments | AspenTech | Europe
Segment Reporting Information [Line Items]
Sales, excluding intersegment eliminations	$ 292	$ 286	$ 154