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DERIVATIVES - AMOUNTS IN NET SALES AND OUTSTANDING COMMODITY DERIVATIVE CONTRACTS (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) item $ / bbl $ / MMBTU | Dec. 31, 2015 USD ($) item $ / bbl $ / MMBTU
Oil (in barrels) | Net sales |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Gain (loss) on derivatives not designated as hedges | $ | $ (5) | $ 28
Natural gas (in cubic feet) | Net sales |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Gain (loss) on derivatives not designated as hedges | $ | $ 1 | $ (26)
Long position | Oil (in barrels) |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Commodity contracts Volume (MMBOE OR Bcf) | item | 67 | 83
Price (in USD per Bbl or mmbtu) | $ / bbl | 53.86 | 45.25
Short position | Natural gas (in cubic feet) |  |
Outstanding commodity derivatives contracts not designated as hedging instruments |  |
Commodity contracts Volume (MMBOE OR Bcf) | item | 12 | 5
Price (in USD per Bbl or mmbtu) | $ / MMBTU | 3.19 | 2.72

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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