Restructuring and Asset Impairment Charges Restructuring and Asset Impairment Charges - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 0
Trade Names | Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Finite-lived		2
2014 Restructuring Plan | Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			22
Restructuring and Related Cost, Expected Cost Remaining			4
Restructuring and Related Cost, Incurred Cost			18
2014 Restructuring Plan | Applied Water
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost			10
Restructuring and Related Cost, Expected Cost Remaining			4
Restructuring and Related Cost, Incurred Cost			6
2014 Restructuring Plan | Corporate Segment
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost			1
2013 Restructuring Plan | Water Infrastructure
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	32	32
Restructuring and Related Cost, Incurred Cost	31		1
2013 Restructuring Plan | Applied Water
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	8	8
Restructuring and Related Cost, Incurred Cost	$ 8