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Restructuring Charges (Accrual Rollfoward) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Restructuring Reserve [Roll Forward]        
Restructuring accruals - January 1     $ 7 $ 29
Restructuring charges, net $ 6 $ 3 6 8
Cash payments     (5) (18)
Asset impairment     0 (1)
Restructuring accruals - June 30 8 18 8 18
Water Infrastructure        
Restructuring Reserve [Roll Forward]        
Restructuring charges, net 2 3 2 7
Restructuring accruals - June 30 1 3 1 3
Applied Water        
Restructuring Reserve [Roll Forward]        
Restructuring charges, net 1 0 1 1
Restructuring accruals - June 30 0 1 0 1
Measurement & Control Solutions        
Restructuring Reserve [Roll Forward]        
Restructuring charges, net 4 0 4 1
Restructuring accruals - June 30 4 11 4 11
Regional Selling Locations        
Restructuring Reserve [Roll Forward]        
Restructuring accruals - June 30 [1] 1 3 1 3
Corporate and Other        
Restructuring Reserve [Roll Forward]        
Restructuring accruals - June 30 $ 2 $ 0 $ 2 $ 0
[1] Regional selling locations consist primarily of selling and marketing organizations and related support services that incurred restructuring expense that was allocated to the segments. The liabilities associated with restructuring expense were not allocated to the segments.