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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 5,341	$ 5,576
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	3,799	4,036
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,542	1,540
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,034	2,167
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,242	1,356
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	792	811
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	906	928
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	426	457
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	480	471
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	615	629
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	345	371
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	270	258
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	1,786	1,852
Global Products | Global Products - HVAC [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,249	1,300
Global Products | Global Products - Fire & Security [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	488	492
Global Products | Global Products - Industrial Refrigeration [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	49	60
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,786	1,852
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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