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DERIVATIVES (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
bbl
Dec. 31, 2018
USD ($)
bbl
Dec. 31, 2017
USD ($)
Derivative [Line Items]      
Gain (loss) on fair value hedge ineffectiveness | $ $ 0 $ 0 $ 0
Crude Oil and Feedstock Inventory [Member] | Fair Value Hedging [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 27,580 0  
Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 3,430,635 3,350,166  
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 5,511,000 5,801,000  
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, notional amount, volume 5,788,000 1,609,000