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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, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | $ 7,683 |  |  | $ 5,154 |  | $ 22,036 | $ 14,583
Segment EBITA | 1,216 |  |  | 720 |  | 2,996 | 1,837
Corporate expenses | (172) |  |  | (126) |  | (605) | (323)
Amortization of intangible assets | (108) |  |  | (22) |  | (383) | (62)
Restructuring and impairment costs | (49) | $ (99) | $ (78) | (27) | $ (60) | (226) | (87)
Net mark-to-market adjustments on pension plans | (45) |  |  | 0 |  | 90 | 0
Net financing charges | (124) |  |  | (65) |  | (376) | (202)
Income from continuing operations before income taxes | 718 |  |  | 480 |  | 1,496 | 1,163
Power Solutions |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,609 |  |  | 1,519 |  | 5,205 | 4,842
Segment EBITA | 304 |  |  | 280 |  | 996 | 922
Building Technologies & Solutions [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 6,074 |  |  | 3,635 |  | 16,831 | 9,741
Segment EBITA | 912 |  |  | 440 |  | 2,000 | 915
Building Technologies & Solutions [Member] | Building Efficiency Systems and Service North America |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,128 |  |  | 1,113 |  | 3,103 | 3,131
Segment EBITA | 126 |  |  | 142 |  | 291 | 342
Building Technologies & Solutions [Member] | Building Efficiency Products North America |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 698 |  |  | 690 |  | 1,826 | 1,793
Segment EBITA | 98 |  |  | 96 |  | 192 | 176
Building Technologies & Solutions [Member] | Building Efficiency Asia |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 1,456 |  |  | 1,361 |  | 3,671 | 3,515
Segment EBITA | 246 |  |  | 180 |  | 483 | 368
Building Technologies & Solutions [Member] | Building Efficiency Rest of World [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 456 |  |  | 471 |  | 1,278 | 1,302
Segment EBITA | 26 |  |  | 22 |  | 25 | 29
Building Technologies & Solutions [Member] | Building Technologies & Solutions Tyco [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 2,336 |  |  | 0 |  | 6,953 | 0
Segment EBITA | 416 |  |  | 0 |  | 1,009 | 0
Building Efficiency |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Net sales | 3,738 |  |  | 3,635 |  | 9,878 | 9,741
Segment EBITA | $ 496 |  |  | $ 440 |  | $ 991 | $ 915

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