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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($)		12 Months Ended
	Sep. 02, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Goodwill [Line Items]
Goodwill, acquired during period		$ 15,000,000	$ (256,000,000)
Goodwill, written off related to divestiture		35,000,000	1,269,000,000
Goodwill		19,473,000,000	19,688,000,000	$ 21,024,000,000
Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss				47,000,000
Building Technologies & Solutions | Global Products
Goodwill [Line Items]
Goodwill, acquired during period		14,000,000	(58,000,000)
Goodwill, written off related to divestiture		35,000,000	1,267,000,000
Goodwill		5,593,000,000	5,687,000,000	6,963,000,000
Building Technologies & Solutions | Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill, acquired during period		1,000,000	(37,000,000)
Goodwill, written off related to divestiture		0	0
Goodwill		1,950,000,000	2,012,000,000	$ 1,981,000,000
Latin America [Member] | Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill		$ 0
Tyco merger [Member]
Goodwill [Line Items]
Goodwill, acquired during period	$ 16,105,000,000
Scott Safety business [Member] | Building Technologies & Solutions | Global Products
Goodwill [Line Items]
Sales Price of Business Divestitures			$ 1,248,000,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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