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DERIVATIVES - Not Designated as Hedging Instruments (Details) $ in Millions | 12 Months Ended
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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

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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=84234895&loc=SL5624171-113959 + Details
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