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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Mar. 31, 2022 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 18,335
Business Acquisitions	123
Business Divestitures	(98)
Goodwill, Impairment Loss	(235)
Currency Translation and Other	(96)
Ending Balance	18,029
Building Solutions North America
Goodwill [Roll Forward]
Beginning Balance	9,215
Business Acquisitions	24
Business Divestitures	0
Goodwill, Impairment Loss	(235)
Currency Translation and Other	12
Ending Balance	9,016
Building Solutions EMEA/LA
Goodwill [Roll Forward]
Beginning Balance	2,041
Business Acquisitions	38
Business Divestitures	(82)
Goodwill, Impairment Loss	0
Currency Translation and Other	(54)
Ending Balance	1,943
Building Solutions Asia Pacific
Goodwill [Roll Forward]
Beginning Balance	1,237
Business Acquisitions	45
Business Divestitures	(16)
Goodwill, Impairment Loss	0
Currency Translation and Other	4
Ending Balance	1,270
Global Products
Goodwill [Roll Forward]
Beginning Balance	5,842
Business Acquisitions	16
Business Divestitures	0
Goodwill, Impairment Loss	0
Currency Translation and Other	(58)
Ending Balance	$ 5,800

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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