BUSINESS SEGMENTS - Schedule of Financial Information By Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 4,393	$ 3,777	$ 8,529	$ 7,165
Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,192	1,960	4,279	3,735
AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,306	1,113	2,547	2,107
Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	895	704	1,703	1,323
Intelligent Devices
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	3,061	2,924	5,883	5,463
Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,588	1,532	3,046	2,901
Intelligent Devices | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	918	866	1,791	1,612
Intelligent Devices | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	555	526	1,046	950
Intelligent Devices | Operating Segments | Final Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,051	992	1,991	1,854
Intelligent Devices | Operating Segments | Final Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	513	494	967	940
Intelligent Devices | Operating Segments | Final Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	404	362	774	670
Intelligent Devices | Operating Segments | Final Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	134	136	250	244
Intelligent Devices | Operating Segments | Measurement & Analytical
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,013	888	1,960	1,637
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	512	455	987	851
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	334	304	659	550
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	167	129	314	236
Intelligent Devices | Operating Segments | Discrete Automation
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	632	683	1,245	1,301
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	294	311	580	602
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	161	184	323	359
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	177	188	342	340
Intelligent Devices | Operating Segments | Safety & Productivity
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	365	361	687	671
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	269	272	512	508
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	19	16	35	33
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	77	73	140	130
Software and Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,332	853	2,646	1,702
Software and Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	604	428	1,233	834
Software and Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	388	247	756	495
Software and Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	340	178	657	373
Software and Control | Operating Segments | Control Systems & Software
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	687	623	1,362	1,229
Software and Control | Operating Segments | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	321	314	646	608
Software and Control | Operating Segments | Control Systems & Software | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	217	186	426	371
Software and Control | Operating Segments | Control Systems & Software | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	149	123	290	250
Software and Control | Operating Segments | Test & Measurement
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	367	0	749	0
Software and Control | Operating Segments | Test & Measurement | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	162	0	326	0
Software and Control | Operating Segments | Test & Measurement | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	98	0	197	0
Software and Control | Operating Segments | Test & Measurement | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	107	0	226	0
Software and Control | Operating Segments | AspenTech
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	278	230	535	473
Software and Control | Operating Segments | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	121	114	261	226
Software and Control | Operating Segments | AspenTech | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	73	61	133	124
Software and Control | Operating Segments | AspenTech | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 84	$ 55	$ 141	$ 123