Segment Information (Summary of Assets by Segment) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Total assets for each reportable segment
Total assets		$ 6,783	$ 6,474
Water Infrastructure
Total assets for each reportable segment
Total assets		1,236	1,179
Applied Water
Total assets for each reportable segment
Total assets		1,018	990
Measurement & Control Solutions
Total assets for each reportable segment
Total assets		3,209	3,102
Regional Selling Locations
Total assets for each reportable segment
Total assets	[1]	1,097	965
Corporate and other
Total assets for each reportable segment
Total assets	[2]	$ 223	$ 238

[1] The Regional selling locations have assets that consist primarily of cash, accounts receivable and inventory which are not allocated to the segments.

[2] Corporate and other consists of items pertaining to our corporate headquarters function, which principally consist of cash, deferred tax assets, pension assets and certain property, plant and equipment.