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Business Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition/divestiture (costs) benefit |  |  | $ (16) |  |
Increase (decrease) in incentive stock compensation expense | $ 14 |  | 65 |  |
Net sales | 4,456 | $ 4,039 | 12,520 | $ 10,829 |
Earnings | 768 | 621 | 1,929 | 1,650 |
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 932 | 744 | 2,564 | 2,162 |
Automation Solutions [Member] | Valves, Actuators & Regulators [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 953 | 772 | 2,746 | 1,718 |
Automation Solutions [Member] | Industrial Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 465 | 430 | 1,368 | 1,216 |
Automation Solutions [Member] | Process Control Systems & Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 520 | 494 | 1,535 | 1,428 |
Operating Segments [Member] | Automation Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 2,870 | 2,440 | 8,213 | 6,524 |
Earnings | 494 | 378 | 1,316 | 1,032 |
Operating Segments [Member] | Commercial & Residential Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,592 | 1,602 | 4,327 | 4,314 |
Earnings | 387 | 402 | 988 | 996 |
Operating Segments [Member] | Tools & Home Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 356 | 415 | 1,041 | 1,210 |
Earnings | 93 | 97 | 276 | 281 |
Operating Segments [Member] | Climate Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,236 | 1,187 | 3,286 | 3,104 |
Earnings | 294 | 305 | 712 | 715 |
Differences in accounting methods [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings | 57 | 38 | 163 | 106 |
Corporate and other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings | (131) | (158) | (425) | (358) |
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (6) | (3) | (20) | (9) |
Earnings | $ (39) | (39) | (113) | $ (126) |
Pentair's Valves & Controls [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  |  |  |  | $ 1,400
Increase (decrease) first year acquisition accounting charges |  |  | $ (8) |  |
Pentair's Valves & Controls [Member] | Order or Production Backlog [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Amortization of intangible assets |  | 7 |  |  |
FairValueAdjustmentToInventoryOnly [Member] | Pentair's Valves & Controls [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Earnings |  | $ 30 |  |  |

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