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Segment Information - Financial Information Related to Company's Reportable Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 7,475 |  | $ 7,267 |  | $ 14,910 | $ 14,353
Segment EBITA | 929 |  | 956 |  | 1,969 | 1,780
Corporate expenses | (159) |  | (240) |  | (293) | (433)
Amortization of intangible assets | (94) |  | (126) |  | (188) | (275)
Restructuring and impairment costs | 0 | $ (158) | (99) | $ (78) | (158) | (177)
Net mark-to-market adjustments on pension plans | 0 |  | 18 | $ 117 | 0 | 135
Net financing charges | (115) |  | (116) |  | (231) | (252)
Income from continuing operations before income taxes | 561 |  | 393 |  | 1,099 | 778
Power Solutions |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 1,845 |  | 1,696 |  | 3,975 | 3,596
Segment EBITA | 314 |  | 303 |  | 698 | 692
Building Technologies & Solutions |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 5,630 |  | 5,571 |  | 10,935 | 10,757
Segment EBITA | 615 |  | 653 |  | 1,271 | 1,088
Building Technologies & Solutions | Building Solutions North America |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 2,097 |  | 2,097 |  | 4,109 | 4,039
Segment EBITA | 239 |  | 255 |  | 466 | 451
Building Technologies & Solutions | Building Solutions EMEA/LA |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 907 |  | 898 |  | 1,822 | 1,773
Segment EBITA | 77 |  | 89 |  | 146 | 138
Building Technologies & Solutions | Building Solutions Asia Pacific |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 586 |  | 562 |  | 1,183 | 1,137
Segment EBITA | 71 |  | 67 |  | 145 | 130
Building Technologies & Solutions | Global Products |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | 2,040 |  | 2,014 |  | 3,821 | 3,808
Segment EBITA | $ 228 |  | $ 242 |  | $ 514 | $ 369

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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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