DERIVATIVES (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($) item $ / MMBTU $ / bbl	Jun. 30, 2015 USD ($) MMBTU item $ / MMBTU $ / bbl bbl	Jun. 30, 2014 item	Mar. 31, 2014 ft³ / d $ / ft³
Derivatives
Net derivative losses recognized in net sales (in dollars) | $	$ (17)	$ (20)
Daily Volume (in cubic feet) | ft³ / d				50,000,000
Weighted-average strike price (in dollars per cubic foot) | $ / ft³				0.00430
Crude Oil - Put Option January 2015 through June 2015
Derivatives
Crude oil production per day (in barrels per day) | bbl		100,000
Hedge price (in dollars per barrel)	50	50
Crude Oil Call Option March Through June 2015
Derivatives
Crude oil production per day associated with the call option (in barrels per day) | bbl		30,000
Hedge price (in dollars per barrel)	75	75
Crude Oil Average Brent Based Hedge - Third Quarter 2015
Derivatives
Daily volume (in barrels per day) | bbl		70,000
Weighted average floor price	52.14	52.14
Crude Oil Brent Based Hedge - Third Quarter 2015
Derivatives
Daily volume (in barrels per day) | bbl		30,000
Ceiling price	72.12	72.12
Crude Oil Hedge - Fourth Quarter 2015
Derivatives
Daily volume (in barrels per day) | bbl		40,000
Weighted average floor price	61.25	61.25
Weighted Average ceiling price	73.88	73.88
Crude Oil Hedge - Total Year 2016
Derivatives
Daily volume (in barrels per day) | bbl		2,000
Hedge price (in dollars per barrel)	72.05	72.05
Natural Gas Index Based Hedge - Second Half 2015 Member
Derivatives
Daily volume (in Mmbtu) | MMBTU		40,000
Hedges average price | $ / MMBTU	3.01	3.01
Natural Gas Collars Based Hedge - Second Half 2015 Member
Derivatives
Daily volume (in Mmbtu) | MMBTU		20,000
Weighted average floor price | $ / MMBTU	2.80	2.80
Weighted Average ceiling price | $ / MMBTU	3.17	3.17
Fair Value Hedges
Derivatives
Number of hedges | item	0	0	0