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Business Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 4,570 | $ 4,248 | $ 8,717 | $ 8,064
Earnings | 675 | 658 | 1,266 | 1,161
Higher (lower) acquisition and divestiture related costs | (33) |  | (35) |
Increase (decrease) in incentive stock compensation expense |  |  | (49) |
Operating Segments [Member] | Automation Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 3,010 | 2,771 | 5,809 | 5,343
Earnings | 444 | 436 | 851 | 822
Operating Segments [Member] | Commercial & Residential Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,561 | 1,483 | 2,899 | 2,735
Earnings | 328 | 349 | 565 | 601
Operating Segments [Member] | Climate Technologies [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 1,092 | 1,128 | 1,972 | 2,050
Earnings | 226 | 253 | 372 | 418
Operating Segments [Member] | Tools & Home Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 469 | 355 | 927 | 685
Earnings | 102 | 96 | 193 | 183
Differences in accounting methods [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings | 65 | 55 | 124 | 106
Corporate and other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings | (114) | (146) | (183) | (294)
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1) | (6) | 9 | (14)
Earnings | $ (48) | (36) | $ (91) | (74)
Pentair's Valves & Controls [Member] | Order or Production Backlog [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Backlog amortization |  | $ 4 |  | 19
FairValueAdjustmentToInventoryOnly [Member] | Pentair's Valves & Controls [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Earnings |  |  |  | $ 10

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