Business Segments Geographic Information (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 4,473	$ 4,161
Reportable Geographical Components [Member]
Disaggregation of Revenue [Line Items]
Net sales	4,476	4,168
Reportable Geographical Components [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	2,385	2,149
Reportable Geographical Components [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,327	1,250
Reportable Geographical Components [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	764	769
Reportable Geographical Components [Member] \| Automation Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,805	2,692
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,241	1,168
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	1,005	942
Reportable Geographical Components [Member] \| Automation Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	559	582
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,671	1,476
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Americas
Disaggregation of Revenue [Line Items]
Net sales	1,144	981
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Asia, Middle East & Africa
Disaggregation of Revenue [Line Items]
Net sales	322	308
Reportable Geographical Components [Member] \| Commercial & Residential Solutions [Member] \| Europe [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 205	$ 187

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
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-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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+ Details