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Segment Information - Financial Information Related to Company's Reportable Segments (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 7,435	$ 7,086
Segment EBITA	1,040	824
Corporate expenses	(134)	(193)
Amortization of intangible assets	(94)	(149)
Restructuring and impairment costs	(158)	(78)
Net mark-to-market adjustments on pension plans	0	117
Net financing charges	(116)	(136)
Income from continuing operations before income taxes	538	385
Power Solutions
Segment Reporting Information [Line Items]
Net sales	2,130	1,900
Segment EBITA	384	389
Building Technologies & Solutions
Segment Reporting Information [Line Items]
Net sales	5,305	5,186
Segment EBITA	656	435
Building Technologies & Solutions | Building Solutions North America
Segment Reporting Information [Line Items]
Net sales	2,012	1,942
Segment EBITA	227	196
Building Technologies & Solutions | Building Solutions EMEA/LA
Segment Reporting Information [Line Items]
Net sales	915	875
Segment EBITA	69	49
Building Technologies & Solutions | Building Solutions Asia Pacific
Segment Reporting Information [Line Items]
Net sales	597	575
Segment EBITA	74	63
Building Technologies & Solutions | Global Products
Segment Reporting Information [Line Items]
Net sales	1,781	1,794
Segment EBITA	$ 286	$ 127

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General expenses recorded at the Corporate segment.

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Amount of income or loss from continuing operations before income taxes and noncontrolling interests, excluding general corporate expenses, intangible asset amortization, net financing charges, significant restructuring and impairment costs, and net mark-to-market adjustments on pension and postretirement plans.

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-Publisher FASB
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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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