Restructuring Charges (Accrual Rollfoward) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restructuring Reserve [Roll Forward]
Restructuring accruals - January 1			$ 12	$ 13
Restructuring charges	$ 1	$ 3	4	18
Cash payments			(9)	(17)
Foreign currency and other			(1)	0
Restructuring accruals - June 30	6	14	6	14
Water Infrastructure
Restructuring Reserve [Roll Forward]
Restructuring charges	1	2	4	12
Restructuring accruals - June 30	3	7	3	7
Applied Water
Restructuring Reserve [Roll Forward]
Restructuring charges	0	1	0	6
Restructuring accruals - June 30	0	4	0	4
Regional Selling Location
Restructuring Reserve [Roll Forward]
Restructuring accruals - June 30	$ 3	$ 3	$ 3	$ 3