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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Beginning Balance	$ 18,178
Business Acquisitions	39
Currency Translation and Other	(145)
Ending Balance	18,072
Building Solutions EMEA/LA
Goodwill [Roll Forward]
Business Divestitures		$ (1)
Building Technologies & Solutions | Building Solutions North America
Goodwill [Roll Forward]
Beginning Balance	9,588
Business Acquisitions	0
Currency Translation and Other	(45)
Ending Balance	9,543
Building Technologies & Solutions | Building Solutions EMEA/LA
Goodwill [Roll Forward]
Beginning Balance	1,849
Business Acquisitions	20
Currency Translation and Other	(15)
Ending Balance	1,854
Building Technologies & Solutions | Building Solutions Asia Pacific
Goodwill [Roll Forward]
Beginning Balance	1,194
Business Acquisitions	0
Currency Translation and Other	(23)
Ending Balance	1,171
Building Technologies & Solutions | Global Products
Goodwill [Roll Forward]
Beginning Balance	5,547
Business Acquisitions	19
Currency Translation and Other	(62)
Ending Balance	$ 5,504

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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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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