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Variable Interest Entities, Non-Consolidated (Details) - MVP Terminalling, LLC (MVP) [Member] $ in Millions | 4 Months Ended
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Dec. 31, 2017 USD ($) member
Variable Interest Entity, Primary Beneficiary [Member] | Magellan Midstream Partners LP (Magellan) [Member] |
Variable Interest Entity (Textual) |
Ownership interest (percent) | 50.00%
Variable Interest Entity, Not Primary Beneficiary [Member] |
Variable Interest Entity (Textual) |
Ownership interest (percent) | 50.00%
Number of members | member | 2
Maximum exposure to loss | $ 80
VLO equity investment in MVP | $ 80

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5747-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity, Qualitative or Quantitative Information, Number of Members + References No definition available. + Details
Name: | vlo_VariableInterestEntityQualitativeorQuantitativeInformationNumberofMembers
Namespace Prefix: | vlo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Variable Interest Entity Textual [Abstract] + References No definition available. + Details
Name: | vlo_VariableInterestEntityTextualAbstract
Namespace Prefix: | vlo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=vlo_MagellanMidstreamPartnersLPMagellanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |