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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2023	May 31, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisitions
Payments to acquire businesses, net of cash acquired			$ 726	$ 269	$ 725
Goodwill			17,936	17,350	$ 18,335
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Business Acquisitions
Reduction in fair value of contingent earn-out liability			39
FM:Systems
Business Acquisitions
Business combination, consideration transferred	$ 540
Payments to acquire businesses, net of cash acquired	465
Contingent earn-out liabilities	$ 75
Contingent earn-out period	2 years
Business combination, contingent consideration arrangements, range of outcomes, value, high	$ 155
Goodwill	$ 399
Silent-Aire
Business Acquisitions
Business combination, consideration transferred		$ 755
Payments to acquire businesses, net of cash acquired		661
Business combination, contingent consideration arrangements, range of outcomes, value, high		250
Business combination, working capital adjustment		8
Contingent earn-out liabilities		$ 86
Silent-Aire | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Business Acquisitions
Reduction in fair value of contingent earn-out liability			30	43
Series of Individually Immaterial Business Acquisitions
Business Acquisitions
Business combination, consideration transferred			306	323
Payments to acquire businesses, net of cash acquired			260	269
Goodwill				194
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles			116	123
Building Solutions EMEA/LA | Series of Individually Immaterial Business Acquisitions
Business Acquisitions
Goodwill			13	68
Global Products | Series of Individually Immaterial Business Acquisitions
Business Acquisitions
Goodwill			119	45
Building Solutions Asia Pacific | Series of Individually Immaterial Business Acquisitions
Business Acquisitions
Goodwill			$ 55	44
Building Solutions North America | Series of Individually Immaterial Business Acquisitions
Business Acquisitions
Goodwill				$ 36

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