Business Segments - Schedule of Financial Information By Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 4,136	$ 3,388
Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,087	1,775
AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,241	994
Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	808	619
Intelligent Devices
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	2,822	2,539
Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,458	1,369
Intelligent Devices | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	873	746
Intelligent Devices | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	491	424
Intelligent Devices | Operating Segments | Final Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	940	862
Intelligent Devices | Operating Segments | Final Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	454	446
Intelligent Devices | Operating Segments | Final Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	370	308
Intelligent Devices | Operating Segments | Final Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	116	108
Intelligent Devices | Operating Segments | Measurement & Analytical
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	947	749
Intelligent Devices | Operating Segments | Measurement & Analytical | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	475	396
Intelligent Devices | Operating Segments | Measurement & Analytical | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	325	246
Intelligent Devices | Operating Segments | Measurement & Analytical | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	147	107
Intelligent Devices | Operating Segments | Discrete Automation
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	613	618
Intelligent Devices | Operating Segments | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	286	291
Intelligent Devices | Operating Segments | Discrete Automation | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	162	175
Intelligent Devices | Operating Segments | Discrete Automation | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	165	152
Intelligent Devices | Operating Segments | Safety & Productivity
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	322	310
Intelligent Devices | Operating Segments | Safety & Productivity | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	243	236
Intelligent Devices | Operating Segments | Safety & Productivity | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	16	17
Intelligent Devices | Operating Segments | Safety & Productivity | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	63	57
Software and Control
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	1,314	849
Software and Control | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	629	406
Software and Control | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	368	248
Software and Control | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	317	195
Software and Control | Operating Segments | Control Systems & Software
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	675	606
Software and Control | Operating Segments | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	325	294
Software and Control | Operating Segments | Control Systems & Software | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	209	185
Software and Control | Operating Segments | Control Systems & Software | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	141	127
Software and Control | Operating Segments | Test & Measurement
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	382	0
Software and Control | Operating Segments | Test & Measurement | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	164	0
Software and Control | Operating Segments | Test & Measurement | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	99	0
Software and Control | Operating Segments | Test & Measurement | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	119	0
Software and Control | Operating Segments | AspenTech
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	257	243
Software and Control | Operating Segments | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	140	112
Software and Control | Operating Segments | AspenTech | AMEA
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	60	63
Software and Control | Operating Segments | AspenTech | Europe
Disaggregation of Revenue [Line Items]
Sales, excluding intersegment eliminations	$ 57	$ 68