Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,998	$ 4,681	$ 5,002
Other	197	195	247
Total	5,195	4,876	5,249
United States
Disaggregation of Revenue [Line Items]
Total	2,280	2,297	2,554
Europe
Disaggregation of Revenue [Line Items]
Total	1,414	1,259	1,235
Water Infrastructure
Disaggregation of Revenue [Line Items]
Total	2,247	2,079	2,177
Water Infrastructure | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	556	558	593
Water Infrastructure | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	753	675	658
Water Infrastructure | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	537	468	491
Water Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	204	183	187
Water Infrastructure | Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,619	1,484	1,533
Water Infrastructure | Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	431	400	397
Applied Water
Disaggregation of Revenue [Line Items]
Total	1,613	1,434	1,541
Applied Water | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	804	754	816
Applied Water | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	370	316	323
Applied Water | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	324	260	300
Applied Water | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	115	104	103
Applied Water | Commercial Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	268	238	247
Applied Water | Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	736	638	694
Measurement & Control Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	796	856	972
Measurement & Control Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	256	234	222
Measurement & Control Solutions | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	189	177	235
Measurement & Control Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	94	96	102
Measurement & Control Solutions | Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,055	1,039	1,134
Measurement & Control Solutions | Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 280	$ 324	$ 397