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Description of Business and Basis of Presentation (tables)
 9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Asset Table
As of September 30, 2013, WES’s assets, exclusive of interests in Fort Union, White Cliffs, Rendezvous and the Mont Belvieu JV accounted for under the equity method, consisted of the following:
 
 
Owned and
Operated
 
Operated
Interests
 
Non-Operated
Interests
Natural gas gathering systems
 
13

 
1

 
5

Natural gas treating facilities
 
8

 
—

 
—

Natural gas processing facilities
 
8

 
3

 
—

NGL pipelines
 
3

 
—

 
—

Natural gas pipelines
 
3

 
—

 
—