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ACQUISITIONS AND DIVESTITURES - 2019 Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Business Acquisition [Line Items]              
Property and equipment, net $ 9,067,000,000       $ 9,067,000,000   $ 14,158,000,000
Proceeds from sale of oil and gas properties         132,000,000 $ 590,000,000  
Asset impairments for property and equipment 0   $ 9,000,000   4,492,000,000 249,000,000  
Leasehold and property acquisitions $ 0       3,000,000 39,000,000  
Disposed of by Sale              
Business Acquisition [Line Items]              
Gain (loss) on sale of non-core assets         5,000,000    
Oklahoma And Texas              
Business Acquisition [Line Items]              
Asset impairments for property and equipment       $ 240,000,000      
Oklahoma And Texas | Disposed of by Sale              
Business Acquisition [Line Items]              
Proceeds from sale of oil and gas properties     322,000,000        
Gain (loss) on sale of non-core assets     7,000,000        
Asset retirement obligations assumed     49,000,000        
Asset impairments for property and equipment     240,000,000        
Oklahoma | Disposed of by Sale              
Business Acquisition [Line Items]              
Property and equipment, net       206,000,000      
Proceeds from sale of oil and gas properties       223,000,000      
Gain (loss) on sale of non-core assets   $ 19,000,000   $ 17,000,000      
Permian Region              
Business Acquisition [Line Items]              
Leasehold and property acquisitions     $ 5,000,000   3,000,000 39,000,000  
Permian Region | Disposed of by Sale              
Business Acquisition [Line Items]              
Proceeds from sale of oil and gas properties         $ 53,000,000 21,000,000  
Gain (loss) on sale of non-core assets           $ 12,000,000