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Description of Business, Basis of Presentation, and Significant Accounting Policies (Details)
gal / yr in Millions, bbl / d in Millions
12 Months Ended
Dec. 31, 2017
gal / yr
bbl / d
refinery
ethanol_plant
branded_wholesale_site
Basis of Presentation and Summary of Significant Accounting Policies (Textual)  
Number of petroleum refineries owned | refinery 15
Combined total throughput capacity of petroleum refining (barrels per day) | bbl / d 3.1
Number of branded wholesale sites | branded_wholesale_site 7,400
Number of ethanol plants owned | ethanol_plant 11
Combined capacity of ethanol (gallons per year) | gal / yr 1,450
Minimum [Member]  
Basis of Presentation and Summary of Significant Accounting Policies (Textual)  
Property, plant, and equipment, useful life 25 years
Maximum [Member]  
Basis of Presentation and Summary of Significant Accounting Policies (Textual)  
Property, plant, and equipment, useful life 30 years