Restructuring Costs (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) employees	Sep. 30, 2020 USD ($) employees	Sep. 30, 2019 USD ($) employees	Sep. 30, 2022 USD ($)
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	$ 181	$ 69
Restructuring costs	150	284	$ 95
Restructuring, paid/utilized	155	172
Restructuring liability, ending balance	$ 176	$ 181	$ 69
Total number of facilities exited	8	6	2
Total number of positions eliminated | employees	3,600	5,400	1,100
Scenario, Forecast [Member] | Minimum [Member]
Restructuring Costs [Roll Forward]
Restructuring and Related Cost, Expected Cost				$ 150
Cost of Sales And Selling and General Administrative Expenses
Restructuring Costs [Roll Forward]
Restructuring costs	$ 38	$ 20
Automation Solutions [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	123	232	$ 65
Commercial & Residential Solutions [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	22	44	27
Climate Technologies [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	15	23	20
Tools & Home Products [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	7	21	7
Severance And Benefits [Member]
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	176	62
Restructuring costs	112	239
Restructuring, paid/utilized	116	125
Restructuring liability, ending balance	172	176	62
Other Restructuring [Member]
Restructuring Costs [Roll Forward]
Restructuring liability, beginning balance	5	7
Restructuring costs	38	45
Restructuring, paid/utilized	39	47
Restructuring liability, ending balance	4	5	7
Corporate, Non-Segment [Member] | Corporate and other [Member]
Restructuring Costs [Roll Forward]
Restructuring costs	$ 5	$ 8	$ 3