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Revenue - Disaggregation of Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 1,162
Other	55
Total	1,217
Water Infrastructure | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	113
Water Infrastructure | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	177
Water Infrastructure | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	135
Water Infrastructure | Transport
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	347
Water Infrastructure | Treatment
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	78
Applied Water | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	188
Applied Water | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	98
Applied Water | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	80
Applied Water | Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	137
Applied Water | Residential Building Services
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	57
Applied Water | Industrial Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	172
Measurement & Control Solutions | United States
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	206
Measurement & Control Solutions | Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	84
Measurement & Control Solutions | Emerging Markets & Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	81
Measurement & Control Solutions | Water
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	172
Measurement & Control Solutions | Electric
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	37
Measurement & Control Solutions | Gas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	43
Measurement & Control Solutions | Software and Services/Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	34
Measurement & Control Solutions | Test
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 85

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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-Section S99
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