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Segment Information, Total Assets by Reportable Segments (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Total assets by reportable segments |  |
Reportable segment assets | $ 45,550 us-gaap_Assets | $ 47,260 us-gaap_Assets
Refining [Member] |  |
Total assets by reportable segments |  |
Reportable segment assets | 40,103 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember | 41,227 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_RefiningMember
Ethanol [Member] |  |
Total assets by reportable segments |  |
Reportable segment assets | 954 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember | 889 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = vlo_EthanolMember
Corporate and Other [Member] |  |
Total assets by reportable segments |  |
Reportable segment assets | $ 4,493 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | $ 5,144 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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