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Restructuring Charges (Restructuring Charges) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Restructuring Cost and Impairment Charge    
Severance and other charges $ 9 $ 8
Lease related charges 1 0
Reversal of restructuring accruals 0 (1)
Restructuring charges 10 7
Asset impairment 0 5
Total restructuring and asset impairment charges 10 12
Water Infrastructure    
Restructuring Cost and Impairment Charge    
Restructuring charges 3 2
Applied Water    
Restructuring Cost and Impairment Charge    
Restructuring charges 1 8
Asset impairment 5  
Measurement & Control Solutions    
Restructuring Cost and Impairment Charge    
Restructuring charges 6 2
Corporate Segment    
Restructuring Cost and Impairment Charge    
Restructuring charges $ 0 $ 0