Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 3,946	$ 3,465	$ 11,075	$ 9,912
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	3,962	3,493	11,127	9,976
Reportable Geographical Components [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,994	1,841	5,729	5,029
Reportable Geographical Components [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,211	998	3,318	3,032
Reportable Geographical Components [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	757	654	2,080	1,915
Reportable Geographical Components [Member] | Final Control
Disaggregation of Revenue [Line Items]
Net sales	1,035	905	2,889	2,606
Reportable Geographical Components [Member] | Final Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	498	434	1,438	1,197
Reportable Geographical Components [Member] | Final Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	399	338	1,069	1,012
Reportable Geographical Components [Member] | Final Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	138	133	382	397
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member]
Disaggregation of Revenue [Line Items]
Net sales	913	788	2,550	2,294
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	482	397	1,333	1,069
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	303	274	853	865
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	128	117	364	360
Reportable Geographical Components [Member] | Discrete Automation
Disaggregation of Revenue [Line Items]
Net sales	668	633	1,969	1,894
Reportable Geographical Components [Member] | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Net sales	312	320	914	890
Reportable Geographical Components [Member] | Discrete Automation | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	180	150	539	504
Reportable Geographical Components [Member] | Discrete Automation | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	176	163	516	500
Reportable Geographical Components [Member] | Safety & Productivity [Member]
Disaggregation of Revenue [Line Items]
Net sales	363	360	1,034	1,066
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	269	270	777	801
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	18	20	51	52
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	76	70	206	213
Reportable Geographical Components [Member] | Intelligent Devices
Disaggregation of Revenue [Line Items]
Net sales	2,979	2,686	8,442	7,860
Reportable Geographical Components [Member] | Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,561	1,421	4,462	3,957
Reportable Geographical Components [Member] | Intelligent Devices | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	900	782	2,512	2,433
Reportable Geographical Components [Member] | Intelligent Devices | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	518	483	1,468	1,470
Reportable Geographical Components [Member] | Control Systems & Software
Disaggregation of Revenue [Line Items]
Net sales	663	568	1,892	1,711
Reportable Geographical Components [Member] | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Net sales	322	289	930	839
Reportable Geographical Components [Member] | Control Systems & Software | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	207	166	578	514
Reportable Geographical Components [Member] | Control Systems & Software | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	134	113	384	358
Reportable Geographical Components [Member] | AspenTech
Disaggregation of Revenue [Line Items]
Net sales	320	239	793	405
Reportable Geographical Components [Member] | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Net sales	111	131	337	233
Reportable Geographical Components [Member] | AspenTech | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	104	50	228	85
Reportable Geographical Components [Member] | AspenTech | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	105	58	228	87
Reportable Geographical Components [Member] | Software and Control
Disaggregation of Revenue [Line Items]
Net sales	983	807	2,685	2,116
Reportable Geographical Components [Member] | Software and Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	433	420	1,267	1,072
Reportable Geographical Components [Member] | Software and Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	311	216	806	599
Reportable Geographical Components [Member] | Software and Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 239	$ 171	$ 612	$ 445