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ACQUISITIONS AND DIVESTITURES - 2018 Activity (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Leasehold and property acquisitions amount   $ 40 $ 133 $ 178
ALTM        
Business Acquisition [Line Items]        
Ownership percentage by parent 79.00%      
Ownership percentage by noncontrolling owners   21.00%    
North Sea and Premian Regions        
Business Acquisition [Line Items]        
Proceeds from sale of certain non-core assets     138  
Gain on sale of non-core assets     23  
North America Onshore Regions        
Business Acquisition [Line Items]        
Leasehold and property acquisitions amount   $ 40 133 $ 188
Altus Midstream LP | KAAC        
Business Acquisition [Line Items]        
Proceeds from contribution $ 628      
Assets contributed 1,100      
Noncontrolling Interest, Altus        
Business Acquisition [Line Items]        
Noncontrolling interest $ 406 $ 73 $ 407