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Business Segment Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Segment Reporting Information [Line Items]      
Net sales $ 3,816 $ 3,216  
Earnings 503 464  
Increase (decrease) in incentive stock compensation expense 40    
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member]      
Segment Reporting Information [Line Items]      
Net sales 772 682  
Automation Solutions [Member] | Valves, Actuators & Regulators [Member]      
Segment Reporting Information [Line Items]      
Net sales 867 449  
Automation Solutions [Member] | Industrial Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales 424 367  
Automation Solutions [Member] | Process Control Systems & Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales 509 469  
Operating Segments [Member] | Automation Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales 2,572 1,967  
Earnings 386 326  
Operating Segments [Member] | Commercial & Residential Solutions [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,252 1,252  
Earnings 252 249  
Operating Segments [Member] | Tools & Home Products [Member]      
Segment Reporting Information [Line Items]      
Net sales 330 393  
Earnings 87 88  
Operating Segments [Member] | Climate Technologies [Member]      
Segment Reporting Information [Line Items]      
Net sales 922 859  
Earnings 165 161  
Differences in accounting methods [Member]      
Segment Reporting Information [Line Items]      
Earnings 51 33  
Corporate and other [Member]      
Segment Reporting Information [Line Items]      
Earnings (148) (98)  
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net sales (8) (3)  
Earnings (38) $ (46)  
Pentair's Valves & Controls [Member]      
Segment Reporting Information [Line Items]      
First year acquisition accounting charges related to inventory 10    
Net sales     $ 1,400
Pentair's Valves & Controls [Member] | Order or Production Backlog [Member]      
Segment Reporting Information [Line Items]      
Backlog amortization $ 15