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Deferred Charges and Other Assets (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Deferred Charges and Other Assets (Textual) |  |  |
Amortization expense, deferred refinery turnaround and catalyst costs and other assets | $ 489 us-gaap_OtherAmortizationOfDeferredCharges | $ 498 us-gaap_OtherAmortizationOfDeferredCharges | $ 447 us-gaap_OtherAmortizationOfDeferredCharges

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- Definition Amount of amortization of other deferred costs recognized in the income statement. + 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 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | vlo_
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Balance Type: | na
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