Segment and Geographic Data (Summary of Operating Results by Segment) (Details) - Operating Segments - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financial information for each reportable segment
Depreciation and Amortization:	$ 140	$ 145	$ 280	$ 290
Capital Expenditures:	89	98	179	169
Water Infrastructure
Financial information for each reportable segment
Depreciation and Amortization:	24	24	50	47
Capital Expenditures:	8	11	18	22
Applied Water
Financial information for each reportable segment
Depreciation and Amortization:	7	9	15	17
Capital Expenditures:	7	5	11	14
Measurement and Control Solutions
Financial information for each reportable segment
Depreciation and Amortization:	41	44	81	83
Capital Expenditures:	16	20	31	36
Water Solutions and Services
Financial information for each reportable segment
Depreciation and Amortization:	66	71	131	139
Capital Expenditures:	37	43	82	63
Regional Selling Locations
Financial information for each reportable segment
Capital Expenditures:	11	10	25	17
Corporate and other
Financial information for each reportable segment
Depreciation and Amortization:	2	(3)	3	4
Capital Expenditures:	$ 10	$ 9	$ 12	$ 17