Business Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 209	$ 203	$ 631	$ 609
Corporate and other [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	8	10	26	30
Operating Segments [Member] | Automation Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	137	133	414	393
Operating Segments [Member] | Commercial & Residential Solutions [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	64	60	191	186
Operating Segments [Member] | Climate Technologies [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	44	42	133	132
Operating Segments [Member] | Tools & Home Products [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 20	$ 18	$ 58	$ 54