Goodwill and Other Intangible Assets (Goodwill Rollforward) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2016	$ 1,584
Acquired	39	[1]
Foreign currency and other	(2)
Balance as of September 30, 2016	1,621
Water Infrastructure
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2016	1,066
Acquired	39	[1]
Foreign currency and other	(2)
Balance as of September 30, 2016	1,103
Applied Water
Changes in the carrying value of goodwill by operating segment
Balance as of January 1, 2016	518
Acquired	0	[1]
Foreign currency and other
Balance as of September 30, 2016	$ 518

[1] On February 1, 2016, we acquired Tideland and recorded $39 million of goodwill. Refer to Note 3, "Acquisitions and Divestitures" for additional information.