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ACQUISITIONS AND DIVESTITURES - 2019 Activity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]              
Proceeds from sale of oil and gas properties         $ 126 $ 247  
Asset impairments for property and equipment $ 20     $ 240 4,492 240  
Property and equipment, net 9,344       9,344   $ 14,158
Leasehold and property acquisitions         3 34  
Disposed of by Sale              
Business Acquisition [Line Items]              
Gain (loss) on sale of non-core assets         6    
U.S. Onshore Regions              
Business Acquisition [Line Items]              
Leasehold and property acquisitions $ 2     19 $ 3 34  
Oklahoma | Disposed of by Sale              
Business Acquisition [Line Items]              
Proceeds from sale of oil and gas properties       223      
Gain (loss) on sale of non-core assets   $ 19   17      
Property and equipment, net       206   $ 206  
Oklahoma And Texas              
Business Acquisition [Line Items]              
Asset impairments for property and equipment       $ 240      
Oklahoma And Texas | Disposed of by Sale              
Business Acquisition [Line Items]              
Proceeds from sale of oil and gas properties     $ 322        
Asset retirement obligations assumed     49        
Asset impairments for property and equipment     240        
Gain (loss) on sale of non-core assets     $ 7