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v3.19.3

Restructuring Costs (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2019 USD ($) employees | Sep. 30, 2018 USD ($) employees | Sep. 30, 2017 USD ($) employees
Restructuring Costs [Roll Forward] |  |  |
Restructuring liability, beginning balance | $ 52 | $ 65 |
Restructuring costs | 95 | 65 | $ 78
Restructuring, paid/utilized | 78 | 78 |
Restructuring liability, ending balance | $ 69 | $ 52 | $ 65
Total number of facilities exited | 2 | 6 | 10
Total number of positions eliminated | employees | 1,100 | 1,200 | 1,200
Automation Solutions [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | $ 65 | $ 41 | $ 63
Commercial & Residential Solutions [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | 27 | 23 | 12
Climate Technologies [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | 20 | 20 | 10
Tools & Home Products [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | 7 | 3 | 2
Severance And Benefits [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring liability, beginning balance | 46 | 60 |
Restructuring costs | 72 | 43 |
Restructuring, paid/utilized | 56 | 57 |
Restructuring liability, ending balance | 62 | 46 | 60
Other Restructuring [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring liability, beginning balance | 6 | 5 |
Restructuring costs | 23 | 22 |
Restructuring, paid/utilized | 22 | 21 |
Restructuring liability, ending balance | 7 | 6 | 5
Corporate, Non-Segment [Member] | Corporate and other [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | 3 | 1 | 3
Series of Individually Immaterial Business Acquisitions [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs | $ 7 |  |
Current year acquired businesses and Pentair's Valves & Controls [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs |  | $ 19 |
Pentair's Valves & Controls [Member] |  |  |
Restructuring Costs [Roll Forward] |  |  |
Restructuring costs |  |  | $ 25

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