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ACQUISITIONS AND DIVESTITURES (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]          
Leasehold and property acquisitions       $ 39 $ 86
Proceeds from sale of oil and gas properties       590 51
Impairments of oil and gas properties $ 9   $ 10 249 10
US Onshore Regions          
Business Acquisition [Line Items]          
Leasehold and property acquisitions 5     39  
Oklahoma and Texas | Disposed of by Sale          
Business Acquisition [Line Items]          
Proceeds from sale of oil and gas properties 325        
Asset retirement obligation assumed 49        
Impairments of oil and gas properties   $ 240      
Gain (loss) on sale of non-core assets $ (9)        
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   17      
Non-core assets disposed, net carrying value   $ 206      
Permian Region | Disposed of by Sale          
Business Acquisition [Line Items]          
Proceeds from sale of oil and gas properties       21 51
Gain (loss) on sale of non-core assets       $ 12 10
US Onshore and Egypt Regions          
Business Acquisition [Line Items]          
Leasehold and property acquisitions     $ 48   $ 86