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Acquisitions and Divestitures (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Business Acquisition [Line Items]
Cash paid for business acquisition	$ (1)	$ 260
Goodwill	17,676		$ 17,936
Global Products
Business Acquisition [Line Items]
Goodwill	5,426		5,491
Building Solutions Asia Pacific
Business Acquisition [Line Items]
Goodwill	1,177		1,179
Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill	$ 1,686		$ 1,885
Individually Immaterial Acquisitions
Business Acquisition [Line Items]
Purchase price, net of cash acquired		306
Cash paid for business acquisition		260
Individually Immaterial Acquisitions | Global Products
Business Acquisition [Line Items]
Goodwill		121
Individually Immaterial Acquisitions | Building Solutions Asia Pacific
Business Acquisition [Line Items]
Goodwill		51
Individually Immaterial Acquisitions | Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill		$ 12

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