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DERIVATIVES - Not Designated as Hedging Instruments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
$ / bbl
$ / MMBTU
MMBbls
Bcf
Dec. 31, 2016
USD ($)
$ / bbl
$ / MMBTU
MMBbls
Bcf
Crude Oil & NGLs | Net sales    
Outstanding commodity derivatives contracts not designated as hedging instruments    
Unrealized gain (loss) on derivatives not designated as hedges $ (47) $ (5)
Crude Oil & NGLs | Long position    
Outstanding commodity derivatives contracts not designated as hedging instruments    
Commodity contracts Volume (MMBOE OR Bcf) | MMBbls 61 67
Price (in USD per Bbl or MMBTU) | $ / bbl 57.38 53.86
Natural gas (in cubic feet) | Net sales    
Outstanding commodity derivatives contracts not designated as hedging instruments    
Unrealized gain (loss) on derivatives not designated as hedges $ 1 $ 1
Natural gas (in cubic feet) | Short position    
Outstanding commodity derivatives contracts not designated as hedging instruments    
Commodity contracts Volume (MMBOE OR Bcf) | Bcf 47 12
Price (in USD per Bbl or MMBTU) | $ / MMBTU 2.73 3.19