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Acquisitions and Divestitures (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Sep. 30, 2023
Business Acquisition [Line Items]
Cash paid for business acquisition	$ (1)	$ 89
Goodwill	17,757		$ 17,936
Global Products
Business Acquisition [Line Items]
Goodwill	5,486		5,491
Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill	$ 1,699		$ 1,885
Individually Immaterial Acquisitions
Business Acquisition [Line Items]
Purchase price, net of cash acquired		115
Cash paid for business acquisition		89
Individually Immaterial Acquisitions | Global Products
Business Acquisition [Line Items]
Goodwill		53
Individually Immaterial Acquisitions | Building Solutions EMEA/LA
Business Acquisition [Line Items]
Goodwill		$ 14

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