Restructuring Charges (Textuals) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Water Infrastructure	Mar. 31, 2013 Water Infrastructure	Mar. 31, 2014 Applied Water	Mar. 31, 2013 Applied Water	Mar. 31, 2014 2014 Restructuring Plan Water Infrastructure	Mar. 31, 2014 2014 Restructuring Plan Applied Water	Mar. 31, 2014 2013 Restructuring Plan Water Infrastructure	Dec. 31, 2013 2013 Restructuring Plan Water Infrastructure	Mar. 31, 2014 2013 Restructuring Plan Applied Water	Dec. 31, 2013 2013 Restructuring Plan Applied Water
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 15	$ 5	$ 10	$ 5	$ 5	$ 0
Restructuring and related cost, expected cost							10	7		33		10
Restructuring and Related Cost, Incurred Cost							9	5	1	31		8
Restructuring and Related Cost, Expected Cost Remaining									$ 1		$ 2