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Segment Information - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Segment
Sep. 30, 2015
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | Segment     2  
Total Revenues $ (2,276) $ (3,376) $ (5,851) $ (10,115)
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 0 0 0 0
Marketing, Gathering And Compression [Member]        
Segment Reporting Information [Line Items]        
Total Revenues (1,099) (2,013) (3,241) (5,993)
Intersubsegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total Revenues 0 0 0 0
Intersubsegment Eliminations [Member] | Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total Revenues (1,025) (1,046) (2,656) (3,483)
Intersubsegment Eliminations [Member] | Marketing, Gathering And Compression [Member] | Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Total Revenues $ 1,025 $ 1,046 $ 2,656 $ 3,483