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Restructuring Charges - Restructuring Charges (Details) - USD ($) $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Impairment Charge
Severance and other charges	$ 21			$ 4		$ 60	$ 21
Asset impairment	3			3		4	19
Reversal of restructuring accruals	(1)			(3)		(2)	(4)
Total restructuring costs	23			4		62	36
Asset impairment charges	0			0		8	1
Total restructuring and asset impairment charges	23			4		70	37
Corporate and other
Restructuring Cost and Impairment Charge
Total restructuring costs	1			0		3	2
Water Infrastructure
Restructuring Cost and Impairment Charge
Asset impairment charges			$ 1
Water Infrastructure \| Operating Segments
Restructuring Cost and Impairment Charge
Total restructuring costs	16			3		38	9
Applied Water \| Operating Segments
Restructuring Cost and Impairment Charge
Total restructuring costs	4			1		16	2
Measurement and Control Solutions
Restructuring Cost and Impairment Charge
Asset impairment charges		$ 2
Measurement and Control Solutions \| Operating Segments
Restructuring Cost and Impairment Charge
Total restructuring costs	1			(3)		7	(3)
Water Solutions and Services
Restructuring Cost and Impairment Charge
Asset impairment charges			$ 3		$ 13
Water Solutions and Services \| Operating Segments
Restructuring Cost and Impairment Charge
Total restructuring costs	$ 1			$ 3		$ 6	$ 27