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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Millions	9 Months Ended
	Jun. 30, 2021 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 17,932
Business Acquisitions	273
Business Divestitures	(7)
Currency Translation and Other	247
Ending Balance	18,445
Building Solutions North America
Goodwill [Roll Forward]
Beginning Balance	9,160
Business Acquisitions	17
Business Divestitures	0
Currency Translation and Other	53
Ending Balance	9,230
Building Solutions EMEA/LA
Goodwill [Roll Forward]
Beginning Balance	1,967
Business Acquisitions	21
Business Divestitures	0
Currency Translation and Other	76
Ending Balance	2,064
Building Solutions Asia Pacific
Goodwill [Roll Forward]
Beginning Balance	1,226
Business Acquisitions	0
Business Divestitures	(7)
Currency Translation and Other	46
Ending Balance	1,265
Global Products
Goodwill [Roll Forward]
Beginning Balance	5,579
Business Acquisitions	235
Business Divestitures	0
Currency Translation and Other	72
Ending Balance	$ 5,886

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.

+ References

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of divestiture 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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