Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,074	$ 1,178
Lease Revenue	49	59
Total	1,123	1,237
Water Infrastructure
Disaggregation of Revenue [Line Items]
Total	438	482
Water Infrastructure | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	121	133
Water Infrastructure | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	157	160
Water Infrastructure | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	59	74
Water Infrastructure | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	52	56
Water Infrastructure | Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	318	346
Water Infrastructure | Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	71	77
Applied Water
Disaggregation of Revenue [Line Items]
Total	338	379
Applied Water | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	191	201
Applied Water | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	82	94
Applied Water | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	24	39
Applied Water | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	41	45
Applied Water | Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	187	213
Applied Water | Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	151	166
Measurement & Control Solutions
Disaggregation of Revenue [Line Items]
Total	347	376
Measurement & Control Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	236
Measurement & Control Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	74	72
Measurement & Control Solutions | Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	22	31
Measurement & Control Solutions | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	30	37
Measurement & Control Solutions | Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	183	199
Measurement & Control Solutions | Energy
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	72	73
Measurement & Control Solutions | Software as a Service
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	21	24
Measurement & Control Solutions | Test
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 71	$ 80