DERIVATIVES - MARKETING DERIVATIVES (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019 Bcf	Dec. 31, 2019 MMBbls	Dec. 31, 2019 $ / MillionCubicFeet	Dec. 31, 2019 $ / Barrel	Dec. 31, 2018 Bcf	Dec. 31, 2018 MMBbls	Dec. 31, 2018 $ / MillionCubicFeet	Dec. 31, 2018 $ / Barrel
Marketing Derivatives
Outstanding commodity derivatives contracts not designated as hedging instruments
Derivative instrument settlement period (within)	3 months
Marketing Derivatives | Not designated as hedging instruments
Outstanding commodity derivatives contracts not designated as hedging instruments
Weighted average sales price (in dollars per share)				2.17	60.60			3.18	58.81
Crude Oil & NGLs | Long position
Outstanding commodity derivatives contracts not designated as hedging instruments
Commodity contracts Volume (MMBOE OR Bcf) | MMBbls			55				61
Natural gas (in cubic feet) | Short position
Outstanding commodity derivatives contracts not designated as hedging instruments
Commodity contracts Volume (MMBOE OR Bcf) | Bcf		128				142