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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, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | $ 8,120 |  | $ 7,683 |  |  | $ 23,030 | $ 22,036
Segment EBITA | 1,252 |  | 1,216 |  |  | 3,221 | 2,996
Corporate expenses | (141) |  | (172) |  |  | (434) | (605)
Amortization of intangible assets | (100) |  | (108) |  |  | (288) | (383)
Restructuring and impairment costs | 0 | $ (158) | (49) | $ (99) | $ (78) | (158) | (226)
Net mark-to-market adjustments on pension plans | 0 |  | (45) | $ 18 | $ 117 | 0 | 90
Net financing charges | (101) |  | (124) |  |  | (332) | (376)
Income from continuing operations before income taxes | 910 |  | 718 |  |  | 2,009 | 1,496
Power Solutions |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,838 |  | 1,609 |  |  | 5,813 | 5,205
Segment EBITA | 310 |  | 304 |  |  | 1,008 | 996
Building Technologies & Solutions |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 6,282 |  | 6,074 |  |  | 17,217 | 16,831
Segment EBITA | 942 |  | 912 |  |  | 2,213 | 2,000
Building Technologies & Solutions | Building Solutions North America |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 2,246 |  | 2,142 |  |  | 6,355 | 6,181
Segment EBITA | 314 |  | 290 |  |  | 780 | 741
Building Technologies & Solutions | Building Solutions EMEA/LA |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 926 |  | 896 |  |  | 2,748 | 2,669
Segment EBITA | 96 |  | 100 |  |  | 242 | 238
Building Technologies & Solutions | Building Solutions Asia Pacific |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 681 |  | 630 |  |  | 1,864 | 1,767
Segment EBITA | 97 |  | 85 |  |  | 242 | 215
Building Technologies & Solutions | Global Products |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 2,429 |  | 2,406 |  |  | 6,250 | 6,214
Segment EBITA | $ 435 |  | $ 437 |  |  | $ 949 | $ 806

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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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