Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 4,431	$ 4,162	$ 8,592	$ 8,313
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	4,438	4,167	8,606	8,322
Reportable Geographical Components [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	2,342	2,383	4,490	4,656
Reportable Geographical Components [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,258	1,065	2,509	2,238
Reportable Geographical Components [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	838	719	1,607	1,428
Reportable Geographical Components [Member] \| Automation Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,793	2,709	5,485	5,561
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,223	1,346	2,390	2,756
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	953	830	1,896	1,726
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	617	533	1,199	1,079
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,645	1,458	3,121	2,761
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,119	1,037	2,100	1,900
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	305	235	613	512
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 221	$ 186	$ 408	$ 349