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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2018 USD ($) Segment	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Segment Information [Line Items]
Number of reportable segments | Segment	5
Restructuring and impairment costs	$ 263	$ 367	$ 288
Equity income in segment income	235	240	174
Gain (loss) on business divestitures - net	114	0	0
Power Solutions
Segment Information [Line Items]
Restructuring and impairment costs	8	20	66
Equity income in segment income	58	83	48
Equity Method Investments	453	447	367
Building Solutions North America
Segment Information [Line Items]
Equity Method Investments	8	8	7
Building Solutions North America | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	20	59
Global Products
Segment Information [Line Items]
Equity Method Investments	740	629	513
Global Products | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	113	32	44
Equity income in segment income	175	151	114
Building Solutions EMEA/LA
Segment Information [Line Items]
Equity Method Investments	99	107	103
Building Solutions EMEA/LA | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	56	74	17
Equity income in segment income	1	5	11
Building Solutions Asia Pacific
Segment Information [Line Items]
Equity Method Investments	1
Building Solutions Asia Pacific | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	16	16
Equity income in segment income	$ 1	$ 1	$ 1

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Segment Information [Line Items]

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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