Restructuring Costs (Details) $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($) employees	Sep. 30, 2021 USD ($) employees	Sep. 30, 2020 USD ($) employees	Sep. 30, 2023 USD ($)
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	$ 176	$ 181
Restructuring costs	86	150	$ 284
Restructuring, paid/utilized	117	155
Restructuring liability, ending balance	$ 145	$ 176	$ 181
Total number of facilities exited	8	8	6
Total number of positions eliminated | employees	2,200	3,600	5,400
Scenario, Forecast [Member] | Minimum [Member]
Restructuring Costs [Roll Forward]
Restructuring and Related Cost, Expected Cost				$ 100
Cost of Sales And Selling and General Administrative Expenses
Restructuring Costs [Roll Forward]
Restructuring costs	$ 43	$ 38
Automation Solutions [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	52	121	$ 225
Commercial & Residential Solutions [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	21	22	44
Climate Technologies [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	10	15	23
Tools & Home Products [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	11	7	21
AspenTech [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	0	2	7
Severance And Benefits [Member]
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	172	176
Restructuring costs	46	112
Restructuring, paid/utilized	79	116
Restructuring liability, ending balance	139	172	176
Other Restructuring [Member]
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	4	5
Restructuring costs	40	38
Restructuring, paid/utilized	38	39
Restructuring liability, ending balance	6	4	5
Corporate, Non-Segment [Member] | Corporate and other [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	$ 13	$ 5	$ 8