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EQUITY METHOD INTERESTS - Summary of Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]    
Equity method interests $ 209 $ 121
Altus Midstream Company    
Schedule of Equity Method Investments [Line Items]    
Equity method interests $ 209 $ 91
Altus Midstream Company | Gulf Coast Express Pipeline LLC    
Schedule of Equity Method Investments [Line Items]    
Interest 15.00% 15.00%
Equity method interests $ 157 $ 91
Altus Midstream Company | EPIC Crude Holdings, LP    
Schedule of Equity Method Investments [Line Items]    
Interest 15.00% 0.00%
Equity method interests $ 52 $ 0