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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Dec. 31, 2020 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 17,932
Business Acquisitions	0
Business Divestitures	(4)
Currency Translation and Other	279
Ending Balance	18,207
Building Solutions North America
Goodwill [Roll Forward]
Beginning Balance	9,160
Business Acquisitions	0
Business Divestitures	0
Currency Translation and Other	36
Ending Balance	9,196
Building Solutions EMEA/LA
Goodwill [Roll Forward]
Beginning Balance	1,967
Business Acquisitions	0
Business Divestitures	0
Currency Translation and Other	104
Ending Balance	2,071
Building Solutions Asia Pacific
Goodwill [Roll Forward]
Beginning Balance	1,226
Business Acquisitions	0
Business Divestitures	(4)
Currency Translation and Other	68
Ending Balance	1,290
Global Products
Goodwill [Roll Forward]
Beginning Balance	5,579
Business Acquisitions	0
Business Divestitures	0
Currency Translation and Other	71
Ending Balance	$ 5,650

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10)(1))
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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.

+ References

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X

- 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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- Definition

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.

+ References

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