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Segment Information Financial Information Related to Company's Reportable Segments (Additional Information) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2021 USD ($) Segment Person	Sep. 30, 2020 USD ($) Person	Sep. 30, 2019 USD ($) Person
Segment Information [Line Items]
Number of reportable segments | Segment	4
Restructuring and impairment costs	$ 242	$ 783	$ 235
Equity income in segment income	$ 261	$ 171	$ 192
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	$ 8	$ 7	$ 8
Building Solutions North America | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	70	520
Equity income in segment income	5	(1)
Global Products
Segment Information [Line Items]
Equity Method Investments	945	797	730
Global Products | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	91	143	235
Equity income in segment income	250	166	179
Building Solutions EMEA/LA
Segment Information [Line Items]
Equity Method Investments	111	108	109
Building Solutions EMEA/LA | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	29	59
Equity income in segment income	5	6	12
Building Solutions Asia Pacific
Segment Information [Line Items]
Equity Method Investments	2	2	6
Building Solutions Asia Pacific | Building Technologies & Solutions
Segment Information [Line Items]
Restructuring and impairment costs	28	56
Equity income in segment income	$ 1	$ 1	$ 1

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