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Acquisitions and Divestitures Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |
Net income (loss) | $ 2,328 | $ 2,224 | $ 1,550
Pretax earnings (loss) | $ 2,859 | 2,667 | 2,335
Net sales |  | 18,186 | 17,148
Net earnings from continuing operations common stockholders |  | $ 2,269 | $ 1,638
Diluted earnings per share from continuing operations |  | $ 3.56 | $ 2.53
Current year acquired businesses and Pentair's Valves & Controls [Member] | Acquisition-related costs and first year acquisition accounting charges [Member] [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax earnings (loss) |  | $ (102) |
Total acquired businesses |  |  |
Business Acquisition [Line Items] |  |  |
Net income (loss) |  | (3) |
Total acquired businesses | Acquisition-related costs and first year acquisition accounting charges [Member] [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax earnings (loss) |  | (73) |
Pentair's Valves & Controls [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net income (loss) |  |  | $ (97)
Pentair's Valves & Controls [Member] | Fair value adjustment to inventory & backlog member [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax earnings (loss) |  |  | (93)
Pentair's Valves & Controls [Member] | First year acquisition accounting charges [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax earnings (loss) |  | $ (29) |
Pentair's Valves & Controls [Member] | Acquisition-related Costs [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Pretax earnings (loss) |  |  | $ (52)

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