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Revenue Recognition (Details) - USD ($)	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 5,576,000,000	$ 5,464,000,000
Deferred revenue	(1,495,000,000)		$ (1,407,000,000)
Contract with Customer Asset Liability Net	(50,000,000)		(45,000,000)
Contract with Customer, Liability, Revenue Recognized	686,000,000	712,000,000
Revenue, Remaining Performance Obligation, Amount	$ 14,700,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	60.00%
Capitalized Contract Cost, Gross	$ 236,000,000		212,000,000
Capitalized Contract Cost, Amortization	26,000,000	35,000,000
Capitalized Contract Cost, Impairment Loss	0
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	4,036,000,000	3,922,000,000
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,540,000,000	1,542,000,000
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,167,000,000	2,116,000,000
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,356,000,000	1,321,000,000
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	811,000,000	795,000,000
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	928,000,000	907,000,000
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	457,000,000	417,000,000
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	471,000,000	490,000,000
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	629,000,000	613,000,000
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	371,000,000	356,000,000
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	258,000,000	257,000,000
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	1,852,000,000	1,828,000,000
Global Products | Global Products- Building Management Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	300,000,000	281,000,000
Global Products | Global Products- HVAC & Refrigeration Equipment [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,285,000,000	1,285,000,000
Global Products | Global Products- Specialty Products [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	267,000,000	262,000,000
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,852,000,000	1,828,000,000
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	$ 0
Other Current Assets
Disaggregation of Revenue [Line Items]
Capitalized Contract Cost, Gross	127,000,000		110,000,000
Accounts Receivable [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Current	1,465,000,000		1,389,000,000
Other Noncurrent Assets
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, Net, Noncurrent	99,000,000		90,000,000
Capitalized Contract Cost, Gross	109,000,000		102,000,000
Deferred Revenue [Member]
Disaggregation of Revenue [Line Items]
Deferred revenue	(1,495,000,000)		(1,407,000,000)
Other Noncurrent Liabilities [Member]
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Noncurrent	$ (119,000,000)		$ (117,000,000)

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