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Business Segments Information (Results Of Operations By Business Segments ) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]                      
Gains (Losses) on divestitures of businesses                 $ 0 $ 0 $ 1,039
Gain on divestiture of business, after tax                 0 0 611
Net sales $ 4,435 $ 4,039 $ 3,574 $ 3,216 $ 3,932 $ 3,674 $ 3,579 $ 3,337 15,264 14,522 16,249
Segment earnings                 2,335 2,316 3,807
Total Assets 19,589       21,732       19,589 21,732 22,088
Automation Solutions [Member] | Measurement & Analytical Instrumentation [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 3,070 3,137 3,619
Automation Solutions [Member] | Valves, Actuators & Regulators [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 2,668 2,137 2,559
Automation Solutions [Member] | Industrial Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 1,680 1,621 1,779
Automation Solutions [Member] | Process Control Systems & Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 2,000 2,082 2,196
Operating Segments [Member] | Automation Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 9,418 8,977 10,153
Segment earnings                 1,522 1,456 1,846
Total Assets 12,581       8,759       12,581 8,759 8,817
Operating Segments [Member] | Commercial & Residential Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 5,857 5,555 5,631
Segment earnings                 1,358 1,286 1,199
Total Assets 3,377       3,298       3,377 3,298 3,272
Operating Segments [Member] | Climate Technologies [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 4,212 3,944 4,006
Segment earnings                 975 902 835
Total Assets 2,547       2,489       2,547 2,489 2,455
Operating Segments [Member] | Tools & Home Products [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 1,645 1,611 1,625
Segment earnings                 383 384 364
Total Assets 830       809       830 809 817
Segment Reconciling Items [Member]                      
Segment Reporting Information [Line Items]                      
Segment earnings                 148 189 174
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Segment earnings                 (528) (427) 705
Corporate, Non-Segment [Member] | Corporate and other [Member]                      
Segment Reporting Information [Line Items]                      
Total Assets $ 3,631       9,675       3,631 9,675 9,999
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 (11) (10) (12)
Segment earnings                 (165) (188) (175)
Discontinued Operations, Held-for-sale [Member]                      
Segment Reporting Information [Line Items]                      
Total assets held-for-sale         $ 6,030         $ 6,030 6,222
Power transmission solutions and commercial storage Businesses                      
Segment Reporting Information [Line Items]                      
Gains (Losses) on divestitures of businesses                     1,039
Gain on divestiture of business, after tax                     $ 611
Disposal gain impact on diluted earnings per share                     $ 0.90
Power transmission solutions and commercial storage Businesses | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                     $ 477
Segment earnings                     $ 58
Pentair's Valves & Controls [Member]                      
Segment Reporting Information [Line Items]                      
First year pretax acquisition accounting charges                 93    
Aftertax first year acquisition accounting charges                 $ 65    
First year acquisition accounting charges after-tax per share                 $ 0.10    
Net sales                 $ 600