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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Goodwill [Line Items]
Document Period End Date	Sep. 30, 2019
Goodwill, acquired during period	$ 25,000,000	$ 15,000,000
Goodwill, written off related to divestiture	23,000,000	35,000,000
Goodwill	18,178,000,000	18,381,000,000	$ 18,591,000,000
Global Products
Goodwill [Line Items]
Goodwill, Transfers	22,000,000
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	11,000,000	14,000,000
Goodwill, written off related to divestiture	22,000,000	35,000,000
Goodwill	5,547,000,000	5,593,000,000	5,687,000,000
Building Technologies & Solutions | Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill, acquired during period	6,000,000	1,000,000
Goodwill, written off related to divestiture	1,000,000	0
Goodwill	1,849,000,000	$ 1,950,000,000	$ 2,012,000,000
Latin America [Member] | Building Solutions EMEA/LA
Goodwill [Line Items]
Goodwill	$ 0

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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