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Restructuring Charges (Estimated Restructuring Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
2021 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs $ 5    
Restructuring costs incurred during period 1 $ 1  
Total expected costs remaining 3    
2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs     $ 68
Restructuring costs incurred during period 2 4 53
Total expected costs remaining     9
Operating Segments | Water Infrastructure | 2021 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 5    
Restructuring costs incurred during period 1 1  
Total expected costs remaining 3    
Operating Segments | Water Infrastructure | 2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs     25
Restructuring costs incurred during period 2 2 19
Total expected costs remaining     2
Operating Segments | Applied Water | 2021 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 0    
Restructuring costs incurred during period 0 0  
Total expected costs remaining 0    
Operating Segments | Applied Water | 2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs     8
Restructuring costs incurred during period 0 1 4
Total expected costs remaining     3
Operating Segments | Measurement & Control Solutions | 2021 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 0    
Restructuring costs incurred during period 0 0  
Total expected costs remaining 0    
Operating Segments | Measurement & Control Solutions | 2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs     33
Restructuring costs incurred during period 0 1 30
Total expected costs remaining     2
Corporate | 2021 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs 0    
Restructuring costs incurred during period 0 0  
Total expected costs remaining 0    
Corporate | 2020 Plan      
Restructuring Cost and Reserve [Line Items]      
Total expected costs     2
Restructuring costs incurred during period $ 0 $ 0 0
Total expected costs remaining     $ 2