BUSINESS SEGMENTS - Schedule of Financial Information By Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 4,395	$ 3,962	$ 12,924	$ 11,127
Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,206	1,994	6,485	5,729
AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,312	1,211	3,859	3,318
Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	877	757	2,580	2,080
Intelligent Devices
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,997	2,979	8,880	8,442
Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,553	1,561	4,599	4,462
Intelligent Devices | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	915	900	2,706	2,512
Intelligent Devices | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	529	518	1,575	1,468
Intelligent Devices | Operating Segments | Final Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,046	1,035	3,037	2,889
Intelligent Devices | Operating Segments | Final Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	509	498	1,476	1,438
Intelligent Devices | Operating Segments | Final Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	398	399	1,172	1,069
Intelligent Devices | Operating Segments | Final Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	139	138	389	382
Intelligent Devices | Operating Segments | Measurement & Analytical
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	982	913	2,942	2,550
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	488	482	1,475	1,333
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	345	303	1,004	853
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	149	128	463	364
Intelligent Devices | Operating Segments | Discrete Automation
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	618	668	1,863	1,969
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	294	312	874	914
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	154	180	477	539
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	170	176	512	516
Intelligent Devices | Operating Segments | Safety & Productivity
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	351	363	1,038	1,034
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	262	269	774	777
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	18	18	53	51
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	71	76	211	206
Software and Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,398	983	4,044	2,685
Software and Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	653	433	1,886	1,267
Software and Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	397	311	1,153	806
Software and Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	348	239	1,005	612
Software and Control | Operating Segments | Control Systems & Software
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	700	663	2,062	1,892
Software and Control | Operating Segments | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	326	322	972	930
Software and Control | Operating Segments | Control Systems & Software | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	224	207	650	578
Software and Control | Operating Segments | Control Systems & Software | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	150	134	440	384
Software and Control | Operating Segments | Test & Measurement
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	355	0	1,104	0
Software and Control | Operating Segments | Test & Measurement | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	160	0	486	0
Software and Control | Operating Segments | Test & Measurement | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	98	0	295	0
Software and Control | Operating Segments | Test & Measurement | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	97	0	323	0
Software and Control | Operating Segments | AspenTech
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	343	320	878	793
Software and Control | Operating Segments | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	167	111	428	337
Software and Control | Operating Segments | AspenTech | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	75	104	208	228
Software and Control | Operating Segments | AspenTech | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 101	$ 105	$ 242	$ 228