Derivatives - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) bbl in Thousands	12 Months Ended
	Dec. 31, 2020 bbl
Credit Derivatives [Line Items]
Derivative contracts, barrels	550
Purchases
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,550
Sales
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,000
Futures
Credit Derivatives [Line Items]
Derivative contracts, barrels	360
Futures | Purchases
Credit Derivatives [Line Items]
Derivative contracts, barrels	360
Futures | Sales
Credit Derivatives [Line Items]
Derivative contracts, barrels	0
Swaps
Credit Derivatives [Line Items]
Derivative contracts, barrels	190
Swaps | Purchases
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,190
Swaps | Sales
Credit Derivatives [Line Items]
Derivative contracts, barrels	1,000