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Accrued Expenses and Other Long-Term Liabilities, Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Retirement Obligations Rollforward Analysis |  |  |
Balance as of beginning of year | $ 31 us-gaap_AssetRetirementObligation | $ 108 us-gaap_AssetRetirementObligation | $ 87 us-gaap_AssetRetirementObligation
Additions to accrual | 60 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 2 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 14 us-gaap_AssetRetirementObligationLiabilitiesIncurred
Revisions in estimated cash flows | 0 us-gaap_AssetRetirementObligationRevisionOfEstimate | 0 us-gaap_AssetRetirementObligationRevisionOfEstimate | 13 us-gaap_AssetRetirementObligationRevisionOfEstimate
Accretion expense | 1 us-gaap_AssetRetirementObligationAccretionExpense | 2 us-gaap_AssetRetirementObligationAccretionExpense | 5 us-gaap_AssetRetirementObligationAccretionExpense
Settlements | (1)us-gaap_AssetRetirementObligationLiabilitiesSettled | (1)us-gaap_AssetRetirementObligationLiabilitiesSettled | (11)us-gaap_AssetRetirementObligationLiabilitiesSettled
Separation of retail business | 0 vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures | (80)vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures | 0 vlo_AccrualforAssetRetirementObligationsIncreaseDecreaseforAcquisitionsandDivestitures
Balance as of end of year | $ 91 us-gaap_AssetRetirementObligation | $ 31 us-gaap_AssetRetirementObligation | $ 108 us-gaap_AssetRetirementObligation
Retail Location [Member] |  |  |
Asset Retirement Obligations (Textual) |  |  |
Property, plant, and equipment, useful life | 20 years |  |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The Increase or Decrease in the accrual for asset retirement obligations in the period arising from business acquisitions or divestitures. + References No definition available. + Details
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