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Investments - Equity Method and Joint Ventures Investments - Equity Method and Joint Ventures table (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments        
Balance at December 31, 2015     $ 58  
Effect of deconsolidation (a) [1]     295  
Equity in earnings [2] $ 3 $ 2 10 $ 6
Distributions received     (21)  
Balance at September 30, 2016 342   342  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 137   137  
Cumulative Effect on Retained Earnings, Net of Tax     2  
Rendezvous Gas Services, L.L.C.        
Schedule of Equity Method Investments        
Balance at December 31, 2015     0  
Effect of deconsolidation (a) [1]     295  
Equity in earnings     6  
Distributions received     (16)  
Balance at September 30, 2016 285   285  
Three Rivers Gathering, L.L.C.        
Schedule of Equity Method Investments        
Balance at December 31, 2015     42  
Effect of deconsolidation (a) [1]     0  
Equity in earnings     2  
Distributions received     (3)  
Balance at September 30, 2016 41   41  
Uintah Basin Field Services, L.L.C.        
Schedule of Equity Method Investments        
Balance at December 31, 2015     16  
Effect of deconsolidation (a) [1]     0  
Equity in earnings     2  
Distributions received     (2)  
Balance at September 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 $137 million at September 30, 2016.
[2] (a)Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.