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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Assets and Investments Table
As of December 31, 2015, WES’s assets, including the Springfield system, and investments accounted for under the equity method (see Basis of presentation and Presentation of WES assets below) consisted of the following:
 
 
Owned and
Operated
 
Operated
Interests
 
Non-Operated
Interests
 
Equity
Interests
Gathering systems
 
12

 
4

 
5

 
2

Treating facilities
 
12

 
7

 
—

 
3

Natural gas processing plants/trains (1)
 
18

 
5

 
—

 
2

NGL pipelines
 
2

 
—

 
—

 
3

Natural gas pipelines
 
4

 
—

 
—

 
—

Oil pipelines
 
—

 
1

 
—

 
1


                                                                                                                                                                                    
(1) 
On December 3, 2015, an incident occurred at the DBM complex. See Note 7.