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Restructuring Charges (Estimated Restructuring Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
2018 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs $ 14    
Restructuring costs incurred during period 8    
Total expected costs remaining 6    
2017 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 34    
Restructuring costs incurred during period 1 $ 11  
Total expected costs remaining 22    
2016 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 40    
Restructuring costs incurred during period 1 9 $ 29
Total expected costs remaining 1    
Operating Segments | Water Infrastructure | 2018 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 5    
Restructuring costs incurred during period 2    
Total expected costs remaining 3    
Operating Segments | Water Infrastructure | 2017 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 20    
Restructuring costs incurred during period 1 5  
Total expected costs remaining 14    
Operating Segments | Water Infrastructure | 2016 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 13    
Restructuring costs incurred during period 0 2 11
Total expected costs remaining 0    
Operating Segments | Applied Water | 2018 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 1    
Restructuring costs incurred during period 1    
Total expected costs remaining 0    
Operating Segments | Applied Water | 2017 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 12    
Restructuring costs incurred during period 0 4  
Total expected costs remaining 8    
Operating Segments | Applied Water | 2016 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 14    
Restructuring costs incurred during period 0 4 10
Total expected costs remaining 0    
Operating Segments | Measurement & Control Solutions | 2018 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 8    
Restructuring costs incurred during period 5    
Total expected costs remaining 3    
Operating Segments | Measurement & Control Solutions | 2017 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 2    
Restructuring costs incurred during period 0 2  
Total expected costs remaining 0    
Operating Segments | Measurement & Control Solutions | 2016 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 11    
Restructuring costs incurred during period 1 3 6
Total expected costs remaining 1    
Corporate | 2018 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 0    
Restructuring costs incurred during period 0    
Total expected costs remaining 0    
Corporate | 2017 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 0    
Restructuring costs incurred during period 0 0  
Total expected costs remaining 0    
Corporate | 2016 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 2    
Restructuring costs incurred during period 0 $ 0 $ 2
Total expected costs remaining $ 0