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ACQUISITIONS AND DIVESTITURES - 2019 Activity (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Proceeds from sale of oil and gas properties       $ 256 $ 166 $ 718
Impairments       208 4,501 2,949
Leasehold and property acquisitions amount       9 4 40
Permian Region            
Business Acquisition [Line Items]            
Leasehold and property acquisitions amount       $ 9 4 40
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Oklahoma And Texas            
Business Acquisition [Line Items]            
Proceeds from sale of oil and gas properties   $ 322        
Asset retirement obligation assumed   49        
Impairments   240        
Gain (loss) on sale of oil and gas properties   $ (7)        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | OKLAHOMA            
Business Acquisition [Line Items]            
Proceeds from sale of oil and gas properties     $ 223      
Gain (loss) on sale of oil and gas properties     17      
Net Property and Equipment     $ 206      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Permian Region            
Business Acquisition [Line Items]            
Proceeds from sale of oil and gas properties $ 176       87 73
Asset retirement obligation assumed 44          
Gain (loss) on sale of oil and gas properties 63       $ 13 $ 33
Net Property and Equipment $ 157