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Restructuring Charges (Restructuring Charges) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Restructuring Cost and Impairment Charge        
Severance and other charges $ 1 $ 0 $ 6 $ 18
Reversal of restructuring accruals 0 0 (1) 0
Restructuring charges 1 0 5 18
Water Infrastructure        
Restructuring Cost and Impairment Charge        
Restructuring charges 1 0 5 12
Applied Water        
Restructuring Cost and Impairment Charge        
Restructuring charges $ 0 $ 0 $ 0 $ 6