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Segment Information - Financial Information Related to Company's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 5,343	$ 6,451	$ 16,363	$ 17,694
Segment EBITA	839	832	2,079	2,079
Corporate expenses	(67)	70	(303)	(233)
Amortization of intangible assets	(95)	(93)	(288)	(288)
Restructuring and impairment costs	(610)	(235)	(783)	(235)
Net mark-to-market adjustments	(132)	9	(154)	8
Net financing charges	(58)	(119)	(169)	(302)
Income (loss) from continuing operations before income taxes	(123)	464	382	1,029
Building Solutions North America
Segment Reporting Information [Line Items]
Net sales	2,020	2,327	6,362	6,630
Segment EBITA	307	300	816	807
Building Solutions EMEA/LA
Segment Reporting Information [Line Items]
Net sales	756	922	2,534	2,707
Segment EBITA	62	101	237	258
Building Solutions Asia Pacific
Segment Reporting Information [Line Items]
Net sales	588	691	1,742	1,932
Segment EBITA	92	98	229	240
Global Products
Segment Reporting Information [Line Items]
Net sales	1,979	2,511	5,725	6,425
Segment EBITA	$ 378	$ 333	$ 797	$ 774

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