Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,122	$ 2,177	$ 6,443	$ 6,406
Lease Revenue	79	91	219	232
Total	2,201	2,268	6,662	6,638
Water Infrastructure \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	270	256	783	704
Water Infrastructure \| Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	211	223	671	673
Water Infrastructure \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	112	118	319	353
Water Infrastructure \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	59	158	157
Water Infrastructure \| Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	388	377	1,177	1,107
Water Infrastructure \| Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	257	279	754	780
Applied Water \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	280	250	823	755
Applied Water \| Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	92	102	292	307
Applied Water \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	83	68	225	210
Applied Water \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34	36	98	102
Applied Water \| Commercial Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	268	260	816	777
Applied Water \| Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	196	622	597
Measurement and Control Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	322	340	1,020	1,022
Measurement and Control Solutions \| Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	47	93	212	259
Measurement and Control Solutions \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	25	46	102	143
Measurement and Control Solutions \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	42	43	118	128
Measurement and Control Solutions \| Smart Metering & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	346	428	1,178	1,281
Measurement and Control Solutions \| Analytics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	90	94	274	271
Water Solutions and Services \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	405	403	1,142	1,185
Water Solutions and Services \| Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21	23	77	73
Water Solutions and Services \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	61	69	177	175
Water Solutions and Services \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	65	48	226	160
Water Solutions and Services \| Capital & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	282	288	846	841
Water Solutions and Services \| Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 270	$ 255	$ 776	$ 752