Accounting Policies - Property, plant and equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Impairment of assets held for sale	$ 0	$ 0	$ 0
Building and building improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	15 years
Building and building improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	40 years
Refinery machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	5 years
Refinery machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	40 years
Pipelines and terminals | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	15 years
Pipelines and terminals | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	40 years
Retail store equipment and site improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	7 years
Retail store equipment and site improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	40 years
Refinery turnaround costs | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	4 years
Refinery turnaround costs | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	6 years
Automobiles | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	3 years
Automobiles | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	5 years
Computer equipment and software | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	3 years
Computer equipment and software | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	10 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	5 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	15 years
Asset retirement obligation assets | Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	15 years
Asset retirement obligation assets | Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	50 years