Restructuring and Asset Impairment Charges (Restructuring Reserve Rollforward) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring accruals		$ 5	$ 7
Severance and other		53	20	$ 20
Cash payments		(30)	(21)	(28)
Foreign currency and other		(1)	(1)
Restructuring accruals		27	5	$ 7
Water Infrastructure
Restructuring Reserve [Roll Forward]
Restructuring accruals		1
Restructuring accruals		1	1
Applied Water
Restructuring Reserve [Roll Forward]
Restructuring accruals		1
Restructuring accruals		0	1
Measurement & Control Solutions
Restructuring Reserve [Roll Forward]
Restructuring accruals		2
Restructuring accruals		19	2
Regional Selling Locations
Restructuring Reserve [Roll Forward]
Restructuring accruals	[1]	1
Restructuring accruals	[1]	$ 7	$ 1

[1] Regional selling locations consist primarily of selling and marketing organizations that incurred restructuring expense which was allocated to the segments. The liabilities associated with restructuring expense were not allocated to the segments.