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Restructuring Charges (Estimated Restructuring Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]          
Restructuring costs incurred during period     $ 3 $ 8  
2020 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs $ 6        
Restructuring costs incurred during period 5 $ 0 $ 2 $ 6  
Total expected costs remaining 1        
2019 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs         $ 4
Restructuring costs incurred during period 0 0     3
Total expected costs remaining         1
Operating Segments | Water Infrastructure | 2020 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs 2        
Restructuring costs incurred during period 2 0      
Total expected costs remaining 0        
Operating Segments | Water Infrastructure | 2019 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs         3
Restructuring costs incurred during period 0 0     3
Total expected costs remaining         0
Operating Segments | Applied Water | 2020 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs 1        
Restructuring costs incurred during period 1 0      
Total expected costs remaining 0        
Operating Segments | Applied Water | 2019 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs         0
Restructuring costs incurred during period 0 0     0
Total expected costs remaining         0
Operating Segments | Measurement & Control Solutions | 2020 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs 3        
Restructuring costs incurred during period 2 0      
Total expected costs remaining 1        
Operating Segments | Measurement & Control Solutions | 2019 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs         1
Restructuring costs incurred during period 0 0     0
Total expected costs remaining         1
Corporate | 2020 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs 0        
Restructuring costs incurred during period 0 0      
Total expected costs remaining 0        
Corporate | 2019 Plan          
Restructuring Cost and Reserve [Line Items]          
Total expected costs         0
Restructuring costs incurred during period $ 0 $ 0     0
Total expected costs remaining         $ 0