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Restructuring and Asset Impairment Charges (Components of Restructuring Charges and Segment Allocation) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Severance and other charges			$ 10	$ 36	$ 51
Lease related charges			0	0	1
Asset impairment			1	18	0
Other restructuring charges			1	1	2
Reversal of restructuring accruals			(6)	(1)	(1)
Total restructuring charges			6	54	53
Asset impairment charges			1	21	10
Total restructuring and asset impairment charges			7	75	63
Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges			8	20	20
Applied Water
Restructuring Cost and Reserve [Line Items]
Restructuring and asset impairment charges			2	4	5
Measurement & Control Solutions
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 11	$ 10
Restructuring and asset impairment charges			$ (3)	$ 51	$ 38