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Restructuring Charges (Accrual Rollfoward) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Restructuring accruals - January 1				$ 29	$ 27
Restructuring charges		$ 3	$ 38	8	40
Cash payments				(18)	(12)
Asset impairment				(1)	(17)
Foreign currency and other				0	(1)
Restructuring accruals - June 30		18	37	18	37
Water Infrastructure
Restructuring Reserve [Roll Forward]
Restructuring charges		3	6	7	8
Restructuring accruals - June 30		3	4	3	4
Applied Water
Restructuring Reserve [Roll Forward]
Restructuring charges		0	2	1	2
Restructuring accruals - June 30		1	1	1	1
Measurement & Control Solutions
Restructuring Reserve [Roll Forward]
Restructuring charges		0	40	1	40
Restructuring accruals - June 30		11	27	11	27
Regional Selling Locations
Restructuring Reserve [Roll Forward]
Restructuring accruals - June 30	[1]	3	4	3	4
Corporate and Other
Restructuring Reserve [Roll Forward]
Restructuring accruals - June 30		$ 0	$ 1	$ 0	$ 1
[1] Regional selling locations consist primarily of selling and marketing organizations and related support services that incurred restructuring expense which was allocated to the segments. The liabilities associated with restructuring expense were not allocated to the segments.

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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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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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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Amount of increase (decrease) in the restructuring reserve related to foreign currency translation (gain) loss and other increases (decreases).

+ References

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