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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 6,614	$ 6,341	$ 18,574	$ 17,276
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	5,082	4,700	14,119	12,531
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,532	1,641	4,455	4,745
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,426	2,212	6,805	6,338
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,481	1,355	4,123	3,869
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	945	857	2,682	2,469
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	952	1,001	2,869	2,883
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	537	507	1,617	1,441
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	415	494	1,252	1,442
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	665	703	1,963	1,901
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	493	413	1,442	1,067
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	172	290	521	834
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	2,571	2,425	6,937	6,154
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	2,571	2,425	6,937	6,154
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	1,889	1,781	5,030	4,373
Global Products | Global Products - Fire & Security [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	610	580	1,732	1,605
Global Products | Global Products - Industrial Refrigeration [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 72	$ 64	$ 175	$ 176

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+ References

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