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Investments - Equity Method Investments - Equity Method table (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Equity Method Investments        
Balance at December 31, 2015     $ 58  
Effect of Deconsolidation [1]     295  
Equity in earnings $ 3 $ 1 7 $ 4
Distributions Received     (15)  
Balance at June 30, 2016 345   345  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 138   138  
Cumulative Effect on Retained Earnings, Net of Tax     $ 2  
Rendezvous Gas Services, L.L.C.        
Schedule of Equity Method Investments        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     78.00%  
Balance at December 31, 2015     $ 0  
Effect of Deconsolidation [1]     295  
Equity in earnings     4  
Distributions Received     (10)  
Balance at June 30, 2016 289   $ 289  
Three Rivers Gathering, L.L.C.        
Schedule of Equity Method Investments        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     50.00%  
Balance at December 31, 2015     $ 42  
Effect of Deconsolidation [1]     0  
Equity in earnings     2  
Distributions Received     (4)  
Balance at June 30, 2016 40   $ 40  
Uintah Basin Field Services, L.L.C.        
Schedule of Equity Method Investments        
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     38.00%  
Balance at December 31, 2015     $ 16  
Effect of Deconsolidation [1]     0  
Equity in earnings     1  
Distributions Received     (1)  
Balance at June 30, 2016 $ 16   $ 16  
[1] We recognized an increase of $295 million to equity method investments as of January 1, 2016 as a result of the deconsolidation of RGS in addition to a cumulative effect reduction to opening equity of $2 million related to the difference in earnings under the equity method of accounting in prior periods. The carrying amount of our investment in RGS exceeded the underlying equity in net assets by $138 million at June 30, 2016.