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Basis of Presentation and Summary of Significant Accounting Policies (Details)
 12 Months Ended
Dec. 31, 2014
plants
refineries
branded_wholesale_sites
Basis of Presentation and Summary of Significant Accounting Policies (Textual)  
Number of refineries owned 15vlo_NumberOfRefineriesOwnedByCompany
Combined total throughput capacity of petroleum refining (barrels per day) 2,900,000vlo_CombinedTotalThroughputCapacityOfPetroleumRefining
Number of branded wholesale sites 7,400vlo_NumberOfBrandedWholesaleSites
Number of ethanol plants owned 11vlo_NumberOfEthanolPlantsOwnedByCompany
Combined capacity of ethanol (gallons per year) 1,300,000,000vlo_CombinedCapacityOfEthanol
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