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EQUITY METHOD INTERESTS - Rollforward Activity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Movement In Equity Method Interests [Roll Forward]        
Equity method interest, beginning balance   $ 121    
Acquisitions   438 $ 0  
Equity method interest, ending balance $ 527 527    
Altus Midstream Company        
Movement In Equity Method Interests [Roll Forward]        
Equity method interest, beginning balance   91    
Acquisitions   228    
Capital contributions   210    
Income (loss) from equity method interests   (2)    
Equity method interest, ending balance 527 527    
Altus Midstream Company | Gulf Coast Express Pipeline LLC        
Movement In Equity Method Interests [Roll Forward]        
Equity method interest, beginning balance   91    
Acquisitions   15    
Capital contributions   144    
Income (loss) from equity method interests   1    
Equity method interest, ending balance $ 251 $ 251    
Equity method investment, percentage acquired 1.00%      
Ownership percentage 16.00% 16.00%   15.00%
Altus Midstream Company | EPIC Crude Holdings, LP        
Movement In Equity Method Interests [Roll Forward]        
Equity method interest, beginning balance   $ 0    
Acquisitions   52    
Capital contributions   56    
Income (loss) from equity method interests   (3)    
Equity method interest, ending balance $ 105 $ 105    
Ownership percentage 15.00% 15.00%   0.00%
Altus Midstream Company | Permian Highway Pipeline LLC        
Movement In Equity Method Interests [Roll Forward]        
Equity method interest, beginning balance   $ 0    
Acquisitions   161    
Capital contributions   10    
Income (loss) from equity method interests   0    
Equity method interest, ending balance $ 171 $ 171    
Ownership percentage 26.70% 26.70%   0.00%