Organization and Basis of Presentation - Risk, Impairment, etc. (Details) - customer	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Organization and Basis of Presentation
Number of customers	0	0	0
Sales Revenue | Product
Organization and Basis of Presentation
Percentage of consolidated total	100.00%	100.00%	100.00%
Sales Revenue | Product | Gasoline sales: gasoline and gasoline blendstocks (such as ethanol)
Organization and Basis of Presentation
Percentage of consolidated total	67.00%	68.00%	67.00%
Sales Revenue | Product | Convenience store and prepared food sales, rental income and sundries
Organization and Basis of Presentation
Percentage of consolidated total	3.00%	4.00%	3.00%
Product Margin | Product
Organization and Basis of Presentation
Percentage of consolidated total	100.00%	100.00%	100.00%
Product Margin | Product | Wholesale segment
Organization and Basis of Presentation
Percentage of consolidated total	25.00%	19.00%	24.00%
Product Margin | Product | Gasoline Distribution and Station Operations segment
Organization and Basis of Presentation
Percentage of consolidated total	73.00%	78.00%	72.00%
Product Margin | Product | Commercial segment
Organization and Basis of Presentation
Percentage of consolidated total	2.00%	3.00%	4.00%