Segment and Geographic Data (Summary of Operating Results by Segment) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	4
Financial information for each reportable segment
Revenue	$ 7,364	$ 5,522	$ 5,195
Operating income	652	622	585
Interest Expense	49	50	76
U.K. pension settlement expense	0	140	0
Other non-operating income, net	33	7	0
(Loss) Gain on sale of businesses	(1)	1	2
Income before taxes	635	440	511
Depreciation and amortization	436	236	245
Capital expenditures	271	208	208
Water Infrastructure
Financial information for each reportable segment
Revenue	2,967	2,364	2,247
Operating income	419	418	387
Depreciation and amortization	110	53	51
Capital expenditures	83	71	74
Applied Water
Financial information for each reportable segment
Revenue	1,853	1,767	1,613
Operating income	310	258	240
Depreciation and amortization	21	19	22
Capital expenditures	32	21	22
Measurement and Control Solutions
Financial information for each reportable segment
Revenue	1,729	1,391	1,335
Operating income	113	2	12
Depreciation and amortization	139	137	145
Capital expenditures	68	77	79
Regional Selling Locations
Financial information for each reportable segment
Depreciation and amortization	25	19	20
Capital expenditures	20	23	25
Corporate and other
Financial information for each reportable segment
Operating income	(198)	(56)	(54)
Depreciation and amortization	11	8	7
Capital expenditures	20	16	8
Integrated Solutions & Services | Operating Segments
Financial information for each reportable segment
Revenue	815	0	0
Operating income	8	0	0
Depreciation and amortization	130	0	0
Capital expenditures	$ 48	$ 0	$ 0