Goodwill And Other Intangibles - Schedule Of Change In Carry Amount Of Goodwill By Business Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 13,946	$ 6,967
Acquisitions	429	7,329
Foreign currency translation and other	105	(350)
Goodwill, ending balance	14,480	13,946
Operating Segments | Intelligent Devices | Final Control
Goodwill [Roll Forward]
Goodwill, beginning balance	2,616	2,762
Acquisitions	0	0
Foreign currency translation and other	44	(146)
Goodwill, ending balance	2,660	2,616
Operating Segments | Intelligent Devices | Measurement & Analytical
Goodwill [Roll Forward]
Goodwill, beginning balance	1,170	1,227
Acquisitions	374	0
Foreign currency translation and other	1	(57)
Goodwill, ending balance	1,545	1,170
Operating Segments | Intelligent Devices | Discrete Automation
Goodwill [Roll Forward]
Goodwill, beginning balance	807	877
Acquisitions	55	0
Foreign currency translation and other	30	(70)
Goodwill, ending balance	892	807
Operating Segments | Intelligent Devices | Safety & Productivity
Goodwill [Roll Forward]
Goodwill, beginning balance	364	415
Acquisitions	0	0
Foreign currency translation and other	24	(51)
Goodwill, ending balance	388	364
Operating Segments | Software and Control | Control Systems & Software
Goodwill [Roll Forward]
Goodwill, beginning balance	663	642
Acquisitions	0	40
Foreign currency translation and other	5	(19)
Goodwill, ending balance	668	663
Operating Segments | Software and Control | AspenTech
Goodwill [Roll Forward]
Goodwill, beginning balance	8,326	1,044
Acquisitions	0	7,289
Foreign currency translation and other	1	(7)
Goodwill, ending balance	$ 8,327	$ 8,326