BUSINESS SEGMENTS - Schedule of Financial Information By Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 4,195	$ 4,136
Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,144	2,087
AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,275	1,241
Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	776	808
Intelligent Devices
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,843	2,822
Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,483	1,458
Intelligent Devices | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	892	873
Intelligent Devices | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	468	491
Intelligent Devices | Operating Segments | Final Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	976	940
Intelligent Devices | Operating Segments | Final Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	476	454
Intelligent Devices | Operating Segments | Final Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	389	370
Intelligent Devices | Operating Segments | Final Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	111	116
Intelligent Devices | Operating Segments | Measurement & Analytical
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	975	947
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	488	475
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	338	325
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	149	147
Intelligent Devices | Operating Segments | Discrete Automation
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	580	613
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	279	286
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	150	162
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	151	165
Intelligent Devices | Operating Segments | Safety & Productivity
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	312	322
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	240	243
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	15	16
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	57	63
Software and Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,352	1,314
Software and Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	661	629
Software and Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	383	368
Software and Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	308	317
Software and Control | Operating Segments | Control Systems & Software
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	690	675
Software and Control | Operating Segments | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	323	325
Software and Control | Operating Segments | Control Systems & Software | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	222	209
Software and Control | Operating Segments | Control Systems & Software | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	145	141
Software and Control | Operating Segments | Test & Measurement
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	359	382
Software and Control | Operating Segments | Test & Measurement | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	175	164
Software and Control | Operating Segments | Test & Measurement | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	93	99
Software and Control | Operating Segments | Test & Measurement | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	91	119
Software and Control | Operating Segments | AspenTech
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	303	257
Software and Control | Operating Segments | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	163	140
Software and Control | Operating Segments | AspenTech | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	68	60
Software and Control | Operating Segments | AspenTech | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 72	$ 57