Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,262	$ 2,227	$ 4,321	$ 4,229
Lease Revenue	74	74	140	141
Total	2,336	2,301	4,461	4,370
Water Infrastructure \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	275	238	513	448
Water Infrastructure \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	245	239	460	450
Water Infrastructure \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	107	120	207	235
Water Infrastructure \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	56	53	106	98
Water Infrastructure \| Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	421	385	789	730
Water Infrastructure \| Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	262	265	497	501
Applied Water \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	286	266	543	505
Applied Water \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	102	107	200	205
Applied Water \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	80	77	142	142
Applied Water \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	33	64	66
Applied Water \| Building Solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	286	270	548	517
Applied Water \| Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	215	213	401	401
Measurement and Control Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	355	360	698	682
Measurement and Control Solutions \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	89	165	166
Measurement and Control Solutions \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	38	52	77	97
Measurement and Control Solutions \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41	39	76	85
Measurement and Control Solutions \| Smart Metering and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	415	449	832	853
Measurement and Control Solutions \| Analytics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	93	91	184	177
Water Solutions and Services \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	372	406	737	782
Water Solutions and Services \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	31	26	56	50
Water Solutions and Services \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	61	57	116	106
Water Solutions and Services \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	106	65	161	112
Water Solutions and Services \| Capital and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	314	299	564	553
Water Solutions and Services \| Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 256	$ 255	$ 506	$ 497