Restructuring and Asset Impairment Charges - Estimated Restructuring Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 5
Incurred restructuring costs	3
Expected costs remaining	2
2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	59
Incurred restructuring costs	6	$ 53
Expected costs remaining	0
Corporate | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	0
Incurred restructuring costs	0
Expected costs remaining	0
Corporate | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	0
Incurred restructuring costs	0	0
Expected costs remaining	0
Operating Segments | Water Infrastructure | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	4
Incurred restructuring costs	3
Expected costs remaining	1
Operating Segments | Water Infrastructure | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	23
Incurred restructuring costs	4	19
Expected costs remaining	0
Operating Segments | Applied Water | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	0
Incurred restructuring costs	0
Expected costs remaining	0
Operating Segments | Applied Water | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	6
Incurred restructuring costs	2	4
Expected costs remaining	0
Operating Segments | Measurement & Control Solutions | 2017 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	1
Incurred restructuring costs	0
Expected costs remaining	1
Operating Segments | Measurement & Control Solutions | 2016 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	30
Incurred restructuring costs	0	$ 30
Expected costs remaining	$ 0