Segment and Geographic Data (Assets by Segment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total assets for each reportable segment
Total assets	$ 8,750	$ 7,710	$ 7,222
Water Infrastructure
Total assets for each reportable segment
Total assets	1,255	1,268	1,233
Applied Water
Total assets for each reportable segment
Total assets	1,005	1,016	1,051
Measurement & Control Solutions
Total assets for each reportable segment
Total assets	3,345	3,497	3,576
Regional Selling Locations
Total assets for each reportable segment
Total assets	1,413	1,375	1,181
Corporate and other
Total assets for each reportable segment
Total assets	$ 1,732	$ 554	$ 181