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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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- Definition 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. + References No definition available. + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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