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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Segment Information [Line Items]
Number of reportable segments | Segment	4
Restructuring and impairment costs	$ 235	$ 255	$ 347
Document Period End Date	Sep. 30, 2019
Equity income in segment income	$ 192	177	157
Gain (loss) on business divestitures - net	0	114	0
Building Solutions North America
Segment Information [Line Items]
Equity Method Investments	8	8	8
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	730	740	629
Global Products | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	235	113	32
Equity income in segment income	179	175	151
Building Solutions EMEA/LA
Segment Information [Line Items]
Equity Method Investments	109	99	107
Building Solutions EMEA/LA | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs		56	74
Equity income in segment income	12	1	5
Building Solutions Asia Pacific
Segment Information [Line Items]
Equity Method Investments	6	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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