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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020 USD ($) Person Segment	Sep. 30, 2019 USD ($) Person	Sep. 30, 2018 USD ($) Person
Segment Information [Line Items]
Number of reportable segments | Segment	4
Restructuring and impairment costs	$ 783	$ 235	$ 255
Equity income in segment income	171	192	177
Gain (loss) on business divestitures - net	$ 0	$ 0	$ 114
Number of customers that individually accounted for 10 % or more of consolidated net sales | Person	0	0	0
Percentage of individual customer sales to consolidated net sales threshold for disclosure as major customer	10.00%	10.00%	10.00%
Building Solutions North America
Segment Information [Line Items]
Equity Method Investments	$ 7	$ 8	$ 8
Building Solutions North America | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	520		20
Equity income in segment income	(1)
Global Products
Segment Information [Line Items]
Equity Method Investments	797	730	740
Global Products | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	143	235	113
Equity income in segment income	166	179	175
Building Solutions EMEA/LA
Segment Information [Line Items]
Equity Method Investments	108	109	99
Building Solutions EMEA/LA | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	59		56
Equity income in segment income	6	12	1
Building Solutions Asia Pacific
Segment Information [Line Items]
Equity Method Investments	2	6	1
Building Solutions Asia Pacific | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	56		16
Equity income in segment income	$ 1	$ 1	$ 1

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