Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financial information for each reportable segment
Revenue	$ 1,005	$ 960	$ 1,911	$ 1,839
Operating income	116	70	192	136
Depreciation and amortization	36	37	72	74
Capital expenditures	23	31	48	60
Water Infrastructure
Financial information for each reportable segment
Revenue	636	596	1,204	1,147
Operating income	77	41	123	83
Depreciation and amortization	27	28	54	56
Capital expenditures	17	21	31	38
Applied Water
Financial information for each reportable segment
Revenue	388	381	743	726
Operating income	52	45	93	85
Depreciation and amortization	7	6	14	14
Capital expenditures	5	8	13	19
Eliminations
Financial information for each reportable segment
Revenue	(19)	(17)	(36)	(34)
Corporate and other
Financial information for each reportable segment
Operating income	(13)	(16)	(24)	(32)
Depreciation and amortization	2	3	4	4
Capital expenditures	$ 1	$ 2	$ 4	$ 3