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DERIVATIVES (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) bbl | Dec. 31, 2017 USD ($) bbl | Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |  |
Gain (loss) on fair value hedge ineffectiveness | $ | $ 0 | $ 0 | $ 0
Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount, volume | 3,350,166 | 3,000,142 |
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount, volume | 5,801,000 | 22,348,000 |
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount, volume | 1,609,000 | 1,989,000 |

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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 gain (loss)recognized in the income statement from the hedging ineffectiveness of a fair value hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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