Accounting Policies - Property, Plant and Equipment (Details)	Dec. 31, 2023
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)	10 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)	10 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