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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,302	$ 1,114	$ 2,513	$ 2,188
Lease Revenue	49	46	94	95
Total	1,351	1,160	2,607	2,283
Water Infrastructure
Disaggregation of Revenue [Line Items]
Total	569	501	1,078	939
Water Infrastructure | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	142	144	265	265
Water Infrastructure | Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	190	157	363	299
Water Infrastructure | Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	133	109	255	195
Water Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	55	45	101	85
Water Infrastructure | Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	414	350	784	668
Water Infrastructure | Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	106	105	200	176
Applied Water
Disaggregation of Revenue [Line Items]
Total	414	337	807	675
Applied Water | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	202	183	396	374
Applied Water | Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	99	70	191	144
Applied Water | Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	81	61	159	111
Applied Water | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	32	23	61	46
Applied Water | Commercial Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	155	133	302	270
Applied Water | Residential Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	73	54	140	104
Applied Water | Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	186	150	365	301
Measurement & Control Solutions
Disaggregation of Revenue [Line Items]
Total	368	322	722	669
Measurement & Control Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	224	212	437	433
Measurement & Control Solutions | Western Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	69	51	143	114
Measurement & Control Solutions | Emerging Markets
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	49	39	95	80
Measurement & Control Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	26	20	47	42
Measurement & Control Solutions | Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	288	240	571	505
Measurement & Control Solutions | Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 80	$ 82	$ 151	$ 164

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