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ACQUISITIONS AND DIVESTITURES (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
May 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]            
Leasehold and property acquisitions     $ 34,000,000 $ 38,000,000    
Assets held for sale $ 379,000,000   379,000,000     $ 0
Impairments 240,000,000 $ 0 240,000,000 0    
Assets held-for-sale, fair value 379,000,000   379,000,000      
U.S. onshore regions            
Business Acquisition [Line Items]            
Leasehold and property acquisitions 19,000,000 $ 26,000,000 34,000,000 38,000,000    
Permian region | Disposed of by Sale            
Business Acquisition [Line Items]            
Proceeds from sale of non-core assets     11,000,000 13,000,000    
Gains on sale of non-core assets     7,000,000 $ 9,000,000    
Oklahoma | Disposed of by Sale            
Business Acquisition [Line Items]            
Proceeds from sale of non-core assets 231,000,000          
Gains on sale of non-core assets 13,000,000          
Assets held for sale 218,000,000   218,000,000      
Oklahoma and Texas | Held-for-sale            
Business Acquisition [Line Items]            
Non-core assets, selling price         $ 367,000,000  
Asset retirement obligation assumed         $ 49,000,000  
Impairments 240,000,000          
Assets held-for-sale, fair value $ 379,000,000   $ 379,000,000