v3.4.0.3
Investments - Equity Method Investments - Equity Method table (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Equity Method Investments    
Balance at December 31, 2015 $ 58  
Effect of Deconsolidation 295  
Equity in earnings of unconsolidated affiliates 4 $ 3
Proceeds from Equity Method Investment, Dividends or Distributions (11)  
Balance at March 31, 2016 346  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity 139  
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 295  
Equity in earnings of unconsolidated affiliates 2  
Proceeds from Equity Method Investment, Dividends or Distributions (9)  
Balance at March 31, 2016 $ 288  
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 0  
Equity in earnings of unconsolidated affiliates 1  
Proceeds from Equity Method Investment, Dividends or Distributions (1)  
Balance at March 31, 2016 $ 42  
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 0  
Equity in earnings of unconsolidated affiliates 1  
Proceeds from Equity Method Investment, Dividends or Distributions (1)  
Balance at March 31, 2016 $ 16