Segment Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financial information for each reportable segment
Revenue		$ 920	$ 1,005	$ 1,757	$ 1,911
Operating income		104	116	187	192
Depreciation and amortization		34	36	69	72
Capital expenditures		20	23	57	48
Water Infrastructure
Financial information for each reportable segment
Revenue		551	616	1,051	1,168
Operating income		65	76	112	122
Depreciation and amortization		23	25	48	50
Capital expenditures		12	14	37	27
Applied Water
Financial information for each reportable segment
Revenue		369	389	706	743
Operating income		51	53	97	94
Depreciation and amortization		6	7	12	13
Capital expenditures		3	5	10	10
Regional Selling Location
Financial information for each reportable segment
Depreciation and amortization	[1]	3	3	5	6
Capital expenditures	[2]	4	2	6	4
Corporate and other
Financial information for each reportable segment
Operating income		(12)	(13)	(22)	(24)
Depreciation and amortization		2	1	4	3
Capital expenditures		$ 1	$ 2	$ 4	$ 7

[1] Depreciation and amortization expense incurred by the Regional selling locations was included in an overall allocation of Regional selling location costs to the segments; however, a certain portion of that expense was not specifically identified to a segment. That expense is captured in this Regional selling location line.

[2] Represents capital expenditures incurred by the Regional selling locations not allocated to the segments.