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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, 2019	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 6,451	$ 6,282		$ 17,694	$ 17,217
Segment EBITA	832	942		2,079	2,213
Corporate expenses	70	(142)		(233)	(442)
Amortization of intangible assets	(93)	(98)		(288)	(282)
Restructuring and impairment costs	(235)	0	$ (154)	(235)	(154)
Equity Securities, FV-NI, Unrealized Gain (Loss) Restricted	9	0
Net mark-to-market adjustments on pension plans				8	0
Net financing charges	(119)	(95)		(302)	(304)
Income from continuing operations before income taxes	464	607		1,029	1,031
Building Solutions North America
Segment Reporting Information [Line Items]
Net sales	2,327			6,630
Building Solutions EMEA/LA
Segment Reporting Information [Line Items]
Net sales	922			2,707
Building Solutions Asia Pacific
Segment Reporting Information [Line Items]
Net sales	691			1,932
Global Products
Segment Reporting Information [Line Items]
Net sales	2,511			6,425
Building Technologies & Solutions | Building Solutions North America
Segment Reporting Information [Line Items]
Net sales	2,327	2,246		6,630	6,355
Segment EBITA	300	314		807	780
Building Technologies & Solutions | Building Solutions EMEA/LA
Segment Reporting Information [Line Items]
Net sales	922	926		2,707	2,748
Segment EBITA	101	96		258	242
Building Technologies & Solutions | Building Solutions Asia Pacific
Segment Reporting Information [Line Items]
Net sales	691	681		1,932	1,864
Segment EBITA	98	97		240	242
Building Technologies & Solutions | Global Products
Segment Reporting Information [Line Items]
Net sales	2,511	2,429		6,425	6,250
Segment EBITA	$ 333	$ 435		$ 774	$ 949

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