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Accrued Expenses and Other Long-Term Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Accrued Expenses |  |  |  |
Defined benefit plan liabilities, current | $ 48 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities |  | $ 30 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities |
Wage and other employee-related liabilities, current | 294 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 257 us-gaap_EmployeeRelatedLiabilitiesCurrent |
Environmental liabilities, current | 26 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  | 24 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |
Accrued interest expense, current | 88 us-gaap_InterestPayableCurrent |  | 90 us-gaap_InterestPayableCurrent |
Derivative liabilities, current | 0 us-gaap_DerivativeLiabilitiesCurrent |  | 13 us-gaap_DerivativeLiabilitiesCurrent |
Asset retirement obligations, current | 20 us-gaap_AssetRetirementObligationCurrent |  | 5 us-gaap_AssetRetirementObligationCurrent |
Other accrued liabilities, current | 120 us-gaap_OtherAccruedLiabilitiesCurrent |  | 103 us-gaap_OtherAccruedLiabilitiesCurrent |
Accrued expenses | 596 us-gaap_AccruedLiabilitiesCurrent |  | 522 us-gaap_AccruedLiabilitiesCurrent |
Other Long-Term Liabilities |  |  |  |
Defined benefit plan liabilities, noncurrent | 792 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent |  | 507 us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent |
Wage and other employee-related liabilities, noncurrent | 104 us-gaap_AccruedEmployeeBenefitsCurrentAndNoncurrent |  | 97 us-gaap_AccruedEmployeeBenefitsCurrentAndNoncurrent |
Uncertain income tax position liabilities, including related penalties and interest | 316 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | [1] | 205 us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | [1]
Environmental liabilities, noncurrent | 269 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |  | 277 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |
Derivative liabilities, noncurrent | 0 us-gaap_DerivativeLiabilitiesNoncurrent |  | 0 us-gaap_DerivativeLiabilitiesNoncurrent |
Asset retirement obligations, noncurrent | 71 us-gaap_AssetRetirementObligationsNoncurrent |  | 26 us-gaap_AssetRetirementObligationsNoncurrent |
Other accrued liabilities, noncurrent | 387 vlo_OtherLiabilitiesNoncurrentOther |  | 217 vlo_OtherLiabilitiesNoncurrentOther |
Other long-term liabilities | 1,939 us-gaap_OtherLiabilitiesNoncurrent |  | 1,329 us-gaap_OtherLiabilitiesNoncurrent |
Uncertain tax position liabilities | 484 vlo_LiabilityforUncertainTaxPositionsCurrentandNoncurrent |  | 443 vlo_LiabilityforUncertainTaxPositionsCurrentandNoncurrent |
Income Taxes Payable [Member] |  |  |  |
Other Long-Term Liabilities |  |  |  |
Uncertain tax position liabilities, current | $ 168 us-gaap_LiabilityForUncertainTaxPositionsCurrent / us-gaap_BalanceSheetLocationAxis = vlo_IncomeTaxesPayableMember |  | $ 238 us-gaap_LiabilityForUncertainTaxPositionsCurrent / us-gaap_BalanceSheetLocationAxis = vlo_IncomeTaxesPayableMember |
[1] | As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in “Income taxes payable” and the remaining $316 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table. As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.

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