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Property, Plant, and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	$ 35,933,000,000us-gaap_PropertyPlantAndEquipmentGross	$ 33,933,000,000us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(9,198,000,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(8,226,000,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant, and equipment, net	26,735,000,000us-gaap_PropertyPlantAndEquipmentNet	25,707,000,000us-gaap_PropertyPlantAndEquipmentNet
Property, Plant, and Equipment (Textual)
Property, plant, and equipment, assets under capital leases	72,000,000us-gaap_CapitalLeasedAssetsGross	74,000,000us-gaap_CapitalLeasedAssetsGross
Accumulated amortization on assets under capital leases	(40,000,000)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	(35,000,000)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
Depreciation expense related to continuing operations	1,200,000,000us-gaap_Depreciation	1,200,000,000us-gaap_Depreciation	1,100,000,000us-gaap_Depreciation
Land [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	396,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember	404,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember
Crude Oil Processing Facilities (Member)
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	28,054,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_RefiningEquipmentMember	27,260,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_RefiningEquipmentMember
Pipeline and Terminal Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	1,955,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = vlo_PipelineAndTerminalMember	1,513,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = vlo_PipelineAndTerminalMember
Grain Processing Equipment [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	779,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember	719,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_EquipmentMember
Administrative Buildings (Member)
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	800,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember	800,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember
Other [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	2,596,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember	2,109,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_PropertyPlantAndEquipmentOtherTypesMember
Construction in Progress [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	$ 1,353,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember	$ 1,128,000,000us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Section S99

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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-Section 45

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The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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-Publisher FASB

-Name Accounting Standards Codification

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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