Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 3,373	$ 3,156
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	3,388	3,174
Reportable Geographical Components [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,775	1,529
Reportable Geographical Components [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	994	1,020
Reportable Geographical Components [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	619	625
Reportable Geographical Components [Member] | Final Control
Disaggregation of Revenue [Line Items]
Net sales	862	817
Reportable Geographical Components [Member] | Final Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	446	352
Reportable Geographical Components [Member] | Final Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	308	336
Reportable Geographical Components [Member] | Final Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	108	129
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member]
Disaggregation of Revenue [Line Items]
Net sales	749	737
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	396	311
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	246	296
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	107	130
Reportable Geographical Components [Member] | Discrete Automation
Disaggregation of Revenue [Line Items]
Net sales	618	617
Reportable Geographical Components [Member] | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Net sales	291	274
Reportable Geographical Components [Member] | Discrete Automation | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	175	183
Reportable Geographical Components [Member] | Discrete Automation | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	152	160
Reportable Geographical Components [Member] | Safety & Productivity [Member]
Disaggregation of Revenue [Line Items]
Net sales	310	351
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	236	270
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	17	16
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	57	65
Reportable Geographical Components [Member] | Intelligent Devices
Disaggregation of Revenue [Line Items]
Net sales	2,539	2,522
Reportable Geographical Components [Member] | Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,369	1,207
Reportable Geographical Components [Member] | Intelligent Devices | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	746	831
Reportable Geographical Components [Member] | Intelligent Devices | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	424	484
Reportable Geographical Components [Member] | Control Systems & Software
Disaggregation of Revenue [Line Items]
Net sales	606	570
Reportable Geographical Components [Member] | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Net sales	294	268
Reportable Geographical Components [Member] | Control Systems & Software | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	185	173
Reportable Geographical Components [Member] | Control Systems & Software | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	127	129
Reportable Geographical Components [Member] | AspenTech
Disaggregation of Revenue [Line Items]
Net sales	243	82
Reportable Geographical Components [Member] | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Net sales	112	54
Reportable Geographical Components [Member] | AspenTech | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	63	16
Reportable Geographical Components [Member] | AspenTech | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	68	12
Reportable Geographical Components [Member] | Software and Control
Disaggregation of Revenue [Line Items]
Net sales	849	652
Reportable Geographical Components [Member] | Software and Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	406	322
Reportable Geographical Components [Member] | Software and Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	248	189
Reportable Geographical Components [Member] | Software and Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 195	$ 141