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DERIVATIVES (Narrative) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
bbl
Dec. 31, 2019
USD ($)
bbl
Dec. 31, 2018
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, Nonmonetary Notional Amount 0 27,580  
Intermediates and Refined Products Inventory [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount 2,604,736 3,430,635  
Crude Oil Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount 7,183,000 5,511,000  
Refined Product Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount 2,810,000 5,788,000