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Impairments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Impairments (Textual) |  |  |
Asset impairment losses | $ 0 us-gaap_AssetImpairmentCharges | $ 0 us-gaap_AssetImpairmentCharges | $ 86 us-gaap_AssetImpairmentCharges
Construction in Progress [Member] |  |  |
Impairments (Textual) |  |  |
Asset impairment losses |  |  | 65 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_ConstructionInProgressMember
Retail Assets [Member] |  |  |
Impairments (Textual) |  |  |
Asset impairment losses |  |  | $ 21 us-gaap_AssetImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = vlo_RetailAssetsMember

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ImpairmentOrDisposalOfTangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=us-gaap_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=vlo_RetailAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |