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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 6,341	$ 5,343	$ 17,276	$ 16,363
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	4,700	3,919	12,531	11,877
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,641	1,424	4,745	4,486
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,212	2,020	6,338	6,362
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,355	1,250	3,869	3,963
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	857	770	2,469	2,399
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	962	756	2,765	2,534
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	468	346	1,323	1,203
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	494	410	1,442	1,331
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	712	588	1,930	1,742
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	422	344	1,096	986
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	290	244	834	756
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	2,455	1,979	6,243	5,725
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	2,455	1,979	6,243	5,725
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
Global Products | Global Products - HVAC [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,811	1,503	4,462	4,127
Global Products | Global Products - Fire & Security [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	580	422	1,605	1,425
Global Products | Global Products - Industrial Refrigeration [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 64	$ 54	$ 176	$ 173

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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