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Fair Value Measurements, Level 3 Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Measurements, Recurring [Member] |  |  |
Fair Value Measurements (Textual) |  |  |
Activity related to fair value amounts categorized in level 3 | $ 0 | $ 0 | $ 0

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- Definition Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph c -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurements, Textual [Abstract] + References No definition available. + Details
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Namespace Prefix: | vlo_
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Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: |
Period Type: |