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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Roll Forward]
Beginning Balance	$ 18,335,000,000	$ 17,932,000,000
Business Acquisitions	219,000,000	300,000,000
Business Divestitures	(127,000,000)	(7,000,000)
Impairments	(310,000,000)	0	$ 0
Currency Translation  and Other	(789,000,000)	110,000,000
Ending Balance	17,328,000,000	18,335,000,000	17,932,000,000
Building Solutions North America
Goodwill [Roll Forward]
Beginning Balance	9,215,000,000	9,160,000,000
Business Acquisitions	37,000,000	21,000,000
Business Divestitures	0	0
Impairments	(235,000,000)	0
Currency Translation  and Other	(46,000,000)	34,000,000
Ending Balance	8,971,000,000	9,215,000,000	9,160,000,000
Building Solutions EMEA/LA
Goodwill [Roll Forward]
Beginning Balance	2,041,000,000	1,987,000,000
Business Acquisitions	78,000,000	35,000,000
Business Divestitures	(98,000,000)	0
Impairments	0	0
Currency Translation  and Other	(296,000,000)	19,000,000
Ending Balance	1,725,000,000	2,041,000,000	1,987,000,000
Building Solutions EMEA/LA | Discontinued Operations, Held-for-sale
Goodwill [Roll Forward]
Business Divestitures	(93,000,000)
Building Solutions Asia Pacific
Goodwill [Roll Forward]
Beginning Balance	1,237,000,000	1,223,000,000
Business Acquisitions	44,000,000	0
Business Divestitures	(29,000,000)	(7,000,000)
Impairments	0	0
Currency Translation  and Other	(136,000,000)	21,000,000
Ending Balance	1,116,000,000	1,237,000,000	1,223,000,000
Building Solutions Asia Pacific | Discontinued Operations, Held-for-sale
Goodwill [Roll Forward]
Business Divestitures	(29,000,000)
Global Products
Goodwill [Roll Forward]
Beginning Balance	5,842,000,000	5,562,000,000
Business Acquisitions	60,000,000	244,000,000
Business Divestitures	0	0
Impairments	(75,000,000)	0
Currency Translation  and Other	(311,000,000)	36,000,000
Ending Balance	$ 5,516,000,000	$ 5,842,000,000	$ 5,562,000,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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