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Acquisitions And Divestitures Acquisitions and Divestitures Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]      
Net income (loss) $ 2,224 $ 1,550 $ 1,664
Pretax earnings (loss) 2,667 2,335 $ 2,316
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)    
Total acquired businesses | First year acquisition accounting charges [Member]      
Business Acquisition [Line Items]      
Pretax earnings (loss) (79)    
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)