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Restructuring Charges (Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Impairment Charge
Severance and other charges	$ 4	$ 21	$ 8	$ 23
Asset impairment	0	17	1	17
Reversal of restructuring accruals	(1)	0	(1)	0
Restructuring charges	3	38	8	40
Asset impairment charges	0	10	1	10
Total restructuring and asset impairment charges	3	48	9	50
Water Infrastructure
Restructuring Cost and Impairment Charge
Restructuring charges	3	6	7	8
Applied Water
Restructuring Cost and Impairment Charge
Restructuring charges	0	2	1	2
Measurement & Control Solutions
Restructuring Cost and Impairment Charge
Restructuring charges	$ 0	40	$ 1	$ 40
Asset impairment charges		$ 10

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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