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Goodwill and Other Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Changes in the carrying value of goodwill by operating segment  
Balance as of December 31, 2012 $ 1,647
Goodwill acquired 48 [1]
Foreign currency and other (21)
Balance as of March 31, 2013 1,674
Water Infrastructure
 
Changes in the carrying value of goodwill by operating segment  
Balance as of December 31, 2012 1,085
Goodwill acquired 48 [1]
Foreign currency and other (16)
Balance as of March 31, 2013 1,117
Applied Water
 
Changes in the carrying value of goodwill by operating segment  
Balance as of December 31, 2012 562
Goodwill acquired 0 [1]
Foreign currency and other (5)
Balance as of March 31, 2013 $ 557
[1] Attributable to the 2013 acquisitions. See Note 3, "Acquisitions" for a description of the acquisitions during 2013.