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Restructuring Charges (Textuals) (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]          
Restructuring charges $ 1,000,000 $ 0 $ 5,000,000 $ 18,000,000  
Water Infrastructure          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 1,000,000 0 5,000,000 12,000,000  
Applied Water          
Restructuring Cost and Reserve [Line Items]          
Restructuring charges 0 $ 0 0 $ 6,000,000  
2015 Restructuring Plan | Water Infrastructure          
Restructuring Cost and Reserve [Line Items]          
Restructuring and related cost, expected cost 6,000,000   6,000,000    
Restructuring and Related Cost, Incurred Cost 1,000,000   4,000,000    
2014 Restructuring Plan | Water Infrastructure          
Restructuring Cost and Reserve [Line Items]          
Restructuring and related cost, expected cost         $ 19,000,000
Restructuring and Related Cost, Incurred Cost $ 0   $ 1,000,000   18,000,000
2014 Restructuring Plan | Applied Water          
Restructuring Cost and Reserve [Line Items]          
Restructuring and related cost, expected cost         6,000,000
Restructuring and Related Cost, Incurred Cost         $ 6,000,000