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Summary of Significant Accounting Policies (tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Assets and Investments Table
As of December 31, 2014, WES’s assets and investments accounted for under the equity method consisted of the following:
 
 
Owned and
Operated
 
Operated
Interests
 
Non-Operated
Interests
 
Equity Interests
Natural gas gathering systems
 
14

 
1

 
5

 
2

Natural gas treating facilities
 
8

 
—

 
—

 
1

Natural gas processing facilities
 
13

 
3

 
—

 
2

NGL pipelines
 
3

 
—

 
—

 
3

Natural gas pipelines
 
4

 
—

 
—

 
—

Oil pipeline
 
1

 
—

 
—

 
1