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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 5,444	$ 5,779	$ 11,020	$ 11,243
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	3,922	4,240	7,958	8,162
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,522	1,539	3,062	3,081
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,175	2,187	4,342	4,303
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,357	1,387	2,713	2,708
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	818	800	1,629	1,595
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	850	878	1,778	1,785
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	400	416	857	833
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	450	462	921	952
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	525	628	1,154	1,241
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	271	351	642	707
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	254	277	512	534
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	1,894	2,086	3,746	3,914
Global Products | Global Products- Building Management Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	316	320	616	601
Global Products | Global Products- HVAC & Refrigeration Equipment [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,307	1,474	2,592	2,759
Global Products | Global Products- Specialty Products [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	271	292	538	554
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,894	2,086	3,746	3,914
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 0	$ 0	$ 0	$ 0

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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