Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Net sales	$ 3,756	$ 3,291	$ 7,129	$ 6,447
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	3,777	3,309	7,165	6,483
Reportable Geographical Components [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,960	1,659	3,735	3,188
Reportable Geographical Components [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,113	1,014	2,107	2,034
Reportable Geographical Components [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	704	636	1,323	1,261
Reportable Geographical Components [Member] | Final Control
Disaggregation of Revenue [Line Items]
Net sales	992	884	1,854	1,701
Reportable Geographical Components [Member] | Final Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	494	412	940	764
Reportable Geographical Components [Member] | Final Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	362	337	670	673
Reportable Geographical Components [Member] | Final Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	136	135	244	264
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member]
Disaggregation of Revenue [Line Items]
Net sales	888	769	1,637	1,506
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	455	361	851	672
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	304	295	550	591
Reportable Geographical Components [Member] | Measurement & Analytical Instrumentation [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	129	113	236	243
Reportable Geographical Components [Member] | Discrete Automation
Disaggregation of Revenue [Line Items]
Net sales	683	644	1,301	1,261
Reportable Geographical Components [Member] | Discrete Automation | Americas
Disaggregation of Revenue [Line Items]
Net sales	311	296	602	570
Reportable Geographical Components [Member] | Discrete Automation | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	184	171	359	354
Reportable Geographical Components [Member] | Discrete Automation | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	188	177	340	337
Reportable Geographical Components [Member] | Safety & Productivity [Member]
Disaggregation of Revenue [Line Items]
Net sales	361	355	671	706
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Americas
Disaggregation of Revenue [Line Items]
Net sales	272	260	508	530
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	16	17	33	33
Reportable Geographical Components [Member] | Safety & Productivity [Member] | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	73	78	130	143
Reportable Geographical Components [Member] | Intelligent Devices
Disaggregation of Revenue [Line Items]
Net sales	2,924	2,652	5,463	5,174
Reportable Geographical Components [Member] | Intelligent Devices | Americas
Disaggregation of Revenue [Line Items]
Net sales	1,532	1,329	2,901	2,536
Reportable Geographical Components [Member] | Intelligent Devices | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	866	820	1,612	1,651
Reportable Geographical Components [Member] | Intelligent Devices | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	526	503	950	987
Reportable Geographical Components [Member] | Control Systems & Software
Disaggregation of Revenue [Line Items]
Net sales	623	573	1,229	1,143
Reportable Geographical Components [Member] | Control Systems & Software | Americas
Disaggregation of Revenue [Line Items]
Net sales	314	282	608	550
Reportable Geographical Components [Member] | Control Systems & Software | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	186	175	371	348
Reportable Geographical Components [Member] | Control Systems & Software | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	123	116	250	245
Reportable Geographical Components [Member] | AspenTech
Disaggregation of Revenue [Line Items]
Net sales	230	84	473	166
Reportable Geographical Components [Member] | AspenTech | Americas
Disaggregation of Revenue [Line Items]
Net sales	114	48	226	102
Reportable Geographical Components [Member] | AspenTech | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	61	19	124	35
Reportable Geographical Components [Member] | AspenTech | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	55	17	123	29
Reportable Geographical Components [Member] | Software and Control
Disaggregation of Revenue [Line Items]
Net sales	853	657	1,702	1,309
Reportable Geographical Components [Member] | Software and Control | Americas
Disaggregation of Revenue [Line Items]
Net sales	428	330	834	652
Reportable Geographical Components [Member] | Software and Control | Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	247	194	495	383
Reportable Geographical Components [Member] | Software and Control | Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 178	$ 133	$ 373	$ 274