Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 2,227	$ 2,037	$ 4,229	$ 3,947
Lease Revenue	74	132	141	255
Total	2,301	2,169	4,370	4,202
Water Infrastructure \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	238	225	448	429
Water Infrastructure \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	239	225	450	436
Water Infrastructure \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	120	122	235	236
Water Infrastructure \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	53	59	98	104
Water Infrastructure \| Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	385	371	730	708
Water Infrastructure \| Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	265	260	501	497
Applied Water \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	266	239	505	471
Applied Water \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	107	102	205	201
Applied Water \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	77	84	142	157
Applied Water \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	33	31	66	63
Applied Water \| Building Solutions
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	270	255	517	495
Applied Water \| Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	213	201	401	397
Measurement and Control Solutions \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	360	329	682	634
Measurement and Control Solutions \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	89	77	166	159
Measurement and Control Solutions \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	47	97	91
Measurement and Control Solutions \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	39	29	85	60
Measurement and Control Solutions \| Smart Metering and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	449	393	853	770
Measurement and Control Solutions \| Analytics
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	91	89	177	174
Water Solutions and Services \| United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	406	358	782	693
Water Solutions and Services \| Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	24	50	47
Water Solutions and Services \| Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57	41	106	83
Water Solutions and Services \| Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	65	45	112	83
Water Solutions and Services \| Capital and Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	299	220	553	423
Water Solutions and Services \| Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 255	$ 248	$ 497	$ 483