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Impairment of Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges		$ 235	$ 36	$ 71
Document Period End Date		Sep. 30, 2019
Global Products
Impairment of Long Lived Assets [Line Items]
Impairment of Long-Lived Assets to be Disposed of	$ 235	$ 235
2018 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			36
2018 Restructuring Plan [Member] | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			31
2018 Restructuring Plan [Member] | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			6
2018 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges			$ 5
2017 Restructuring Plan [Member]
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				70
2017 Restructuring Plan [Member] | Building Solutions Asia Pacific
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				1
2017 Restructuring Plan [Member] | Building Solutions North America
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				30
2017 Restructuring Plan [Member] | Global Products
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				20
2017 Restructuring Plan [Member] | Power Solutions
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				7
2017 Restructuring Plan [Member] | Corporate
Impairment of Long Lived Assets [Line Items]
Asset Impairment Charges				$ 19

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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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[Line Items] for Impairment of Long Lived Assets [Table]

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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-Publisher FASB
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-Topic 360
-SubTopic 10
-Section 45
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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
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