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Income Taxes (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations |  |  |
U.S. operations | $ 4,677,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 3,531,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic | $ 4,015,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
International operations | 875,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 445,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 725,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations before income tax expense | 5,552,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 3,976,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 4,740,000,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense |  |  |
Federal income tax expense at the U.S. federal statutory rate | 1,943,000,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 1,392,000,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 1,659,000,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
U.S. state income tax expense, net of U.S. federal income tax effect | 62,000,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 62,000,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 64,000,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
U.S. manufacturing deduction | (74,000,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (36,000,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (33,000,000)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
International operations | (88,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (69,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (96,000,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Permanent differences | (16,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | (104,000,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther | 20,000,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther
Change in tax law | 0 us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy | (32,000,000)us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy | 0 us-gaap_IncomeTaxReconciliationDeductionsMedicarePrescriptionDrugBenefitSubsidy
Other, net | (50,000,000)us-gaap_IncomeTaxReconciliationOtherAdjustments | 41,000,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 12,000,000 us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense | 1,777,000,000 us-gaap_IncomeTaxExpenseBenefit | 1,254,000,000 us-gaap_IncomeTaxExpenseBenefit | 1,626,000,000 us-gaap_IncomeTaxExpenseBenefit
Current: |  |  |
U.S. federal | 1,196,000,000 us-gaap_CurrentFederalTaxExpenseBenefit | 635,000,000 us-gaap_CurrentFederalTaxExpenseBenefit | 515,000,000 us-gaap_CurrentFederalTaxExpenseBenefit
U.S. state | 59,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 36,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 22,000,000 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
International | 77,000,000 us-gaap_CurrentForeignTaxExpenseBenefit | 82,000,000 us-gaap_CurrentForeignTaxExpenseBenefit | 126,000,000 us-gaap_CurrentForeignTaxExpenseBenefit
Total current | 1,332,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 753,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit | 663,000,000 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred: |  |  |
U.S. federal | 268,000,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 459,000,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 854,000,000 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. state | 36,000,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 59,000,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 77,000,000 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
International | 141,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (17,000,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 32,000,000 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred | 445,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 501,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 963,000,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense | 1,777,000,000 us-gaap_IncomeTaxExpenseBenefit | 1,254,000,000 us-gaap_IncomeTaxExpenseBenefit | 1,626,000,000 us-gaap_IncomeTaxExpenseBenefit
Deferred income tax assets: |  |  |
Tax credit carryforwards | 37,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 48,000,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
Net operating losses (NOLs) | 436,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 338,000,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Inventories | 160,000,000 us-gaap_DeferredTaxAssetsInventory | 264,000,000 us-gaap_DeferredTaxAssetsInventory |
Property, plant, and equipment | 0 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 8,000,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
Compensation and employee benefit liabilities | 358,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 178,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits |
Environmental liabilities | 92,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves | 92,000,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves |
Other | 178,000,000 us-gaap_DeferredTaxAssetsOther | 187,000,000 us-gaap_DeferredTaxAssetsOther |
Total deferred income tax assets | 1,261,000,000 us-gaap_DeferredTaxAssetsGross | 1,115,000,000 us-gaap_DeferredTaxAssetsGross |
Less: Valuation allowance | (393,000,000)us-gaap_DeferredTaxAssetsValuationAllowance | (347,000,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred income tax assets | 868,000,000 us-gaap_DeferredTaxAssetsNet | 768,000,000 us-gaap_DeferredTaxAssetsNet |
Deferred income tax liabilities: |  |  |
Property, plant, and equipment | 6,682,000,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | 6,536,000,000 us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Deferred turnaround costs | 356,000,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts | 331,000,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts |
Inventories | 426,000,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts | 310,000,000 us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts |
Investments | 152,000,000 us-gaap_DeferredTaxLiabilitiesInvestments | 94,000,000 us-gaap_DeferredTaxLiabilitiesInvestments |
Other | 73,000,000 us-gaap_DeferredTaxLiabilitiesOther | 81,000,000 us-gaap_DeferredTaxLiabilitiesOther |
Total deferred income tax liabilities | 7,689,000,000 us-gaap_DeferredIncomeTaxLiabilities | 7,352,000,000 us-gaap_DeferredIncomeTaxLiabilities |
Net deferred income tax liabilities | 6,821,000,000 us-gaap_DeferredTaxLiabilities | 6,584,000,000 us-gaap_DeferredTaxLiabilities |
Valuation Allowance Allocation |  |  |
Deferred tax assets valuation allowance | 393,000,000 us-gaap_DeferredTaxAssetsValuationAllowance | 347,000,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Reconciliation of the Change in Unrecognized Tax Benefits RollForward |  |  |
Balance as of beginning of year | 950,000,000 us-gaap_UnrecognizedTaxBenefits | 341,000,000 us-gaap_UnrecognizedTaxBenefits | 326,000,000 us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to the current year | 35,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 64,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 11,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Additions for tax positions related to prior years | 118,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 576,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 40,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions related to prior years | (67,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (26,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (36,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions related to the lapse of applicable statute of limitations | (1,000,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (4,000,000)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements | (46,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (1,000,000)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Balance as of end of year | 989,000,000 us-gaap_UnrecognizedTaxBenefits | 950,000,000 us-gaap_UnrecognizedTaxBenefits | 341,000,000 us-gaap_UnrecognizedTaxBenefits
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities |  |  |
Unrecognized tax benefits | 989,000,000 us-gaap_UnrecognizedTaxBenefits | 950,000,000 us-gaap_UnrecognizedTaxBenefits | 341,000,000 us-gaap_UnrecognizedTaxBenefits
Tax refund claim not recognized in our financial statements | (118,000,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | (576,000,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | (40,000,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Penalties, interest (net of U.S. federal and state income tax effect), and the U.S. federal income tax effect of state unrecognized tax benefits | 49,000,000 vlo_PenaltiesInterestandtheU.S.FederalIncomeTaxEffectofStateUnrecognizedTaxBenefits | 49,000,000 vlo_PenaltiesInterestandtheU.S.FederalIncomeTaxEffectofStateUnrecognizedTaxBenefits |
Uncertain tax position liabilities | 484,000,000 vlo_LiabilityforUncertainTaxPositionsCurrentandNoncurrent | 443,000,000 vlo_LiabilityforUncertainTaxPositionsCurrentandNoncurrent |
Income Taxes (Textual) |  |  |
Statutory federal income tax rate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Gain on disposition of retained interest in CST Brands, Inc. | 0 us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee | 325,000,000 us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee | 0 us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee
Income tax benefit related to discontinued operations | 0 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 0 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 0 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Increase in valuation allowance | 46,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Cumulative undistributed earnings of foreign subsidiaries | 2,900,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Additions for tax positions related to prior years | 118,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 576,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 40,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Income tax benefits if recognized that would impact the effective tax rate | 768,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 763,000,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Possible reduction to unrecognized tax benefit | 133,000,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |
Interest expense and penalties recognized |  | 12,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense | 23,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Interest expense and penalties accrued | 141,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued | 145,000,000 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued |
Tax Years 2005 to 2012 [Member] |  |  |
Reconciliation of the Change in Unrecognized Tax Benefits RollForward |  |  |
Additions for tax positions related to prior years | 554,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member | 556,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member |
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities |  |  |
Tax refund claim not recognized in our financial statements | (554,000,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member | (556,000,000)us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member |
Income Taxes (Textual) |  |  |
Additions for tax positions related to prior years | 554,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member | 556,000,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions / us-gaap_TaxPeriodAxis = vlo_TaxYears2005to2012Member |
Consolidated Statement Of Income [Member] |  |  |
Deferred income tax assets: |  |  |
Less: Valuation allowance | (386,000,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = vlo_ConsolidatedStatementOfIncomeMember |  |
Valuation Allowance Allocation |  |  |
Deferred tax assets valuation allowance | 386,000,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = vlo_ConsolidatedStatementOfIncomeMember |  |
Additional Paid-in Capital [Member] |  |  |
Deferred income tax assets: |  |  |
Less: Valuation allowance | (7,000,000)us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Valuation Allowance Allocation |  |  |
Deferred tax assets valuation allowance | 7,000,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_ValuationAllowanceByDeferredTaxAssetAxis = us-gaap_AdditionalPaidInCapitalMember |  |
State and Local Jurisdiction [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
NOL | 6,574,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
State and Local Jurisdiction [Member] | Minimum [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
NOL, expiration | Dec. 31, 2015 |  |
State and Local Jurisdiction [Member] | Maximum [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
NOL, expiration | Dec. 31, 2034 |  |
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
U.S. state income tax credits | 53,000,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = vlo_USStateIncomeTaxCreditsLimitedMember |  |
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Minimum [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
Income tax credits, expiration | Dec. 31, 2015 |  |
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Maximum [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
Income tax credits, expiration | Dec. 31, 2027 |  |
Foreign Tax Authority [Member] |  |  |
Income Tax Credit and Loss Carryforwards |  |  |
NOL | $ 1,630,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Paragraph Question 1-7 + Details
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