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Acquisitions and Divestitures (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Jul. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Business Acquisition [Line Items]
Cash paid for business acquisition		$ 260	$ 236
Goodwill		17,644		$ 17,350
Building Solutions Asia Pacific
Business Acquisition [Line Items]
Goodwill		1,188		1,116
Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill		1,933		1,747
Building Solutions EMEA/LA | Business Divestitures, Not Specific
Business Acquisition [Line Items]
Proceeds from divestiture of businesses			18
Business divestitures, net of cash divested			16
Goodwill, written off related to sale of business unit			5
Global Products
Business Acquisition [Line Items]
Goodwill		5,535		5,516
Building Solutions North America
Business Acquisition [Line Items]
Goodwill		8,988		$ 8,971
Individually Immaterial Acquisitions
Business Acquisition [Line Items]
Purchase price, net of cash acquired		306	287
Cash paid for business acquisition		260	236
Individually Immaterial Acquisitions | Building Solutions Asia Pacific
Business Acquisition [Line Items]
Goodwill		51	45
Individually Immaterial Acquisitions | Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill		12	68
Individually Immaterial Acquisitions | Global Products
Business Acquisition [Line Items]
Goodwill		$ 121	45
Individually Immaterial Acquisitions | Building Solutions North America
Business Acquisition [Line Items]
Goodwill			$ 24
FM:Systems | Subsequent Event
Business Acquisition [Line Items]
Base purchase price	$ 455
Business combination, contingent consideration for post-closing earnout milestones	$ 155
Contingent consideration earnout period	2 years

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