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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2015
Price Risk Management Activities (Textual)
Compliance program costs	$ 372us-gaap_CostOfGoodsSoldOverhead	$ 517us-gaap_CostOfGoodsSoldOverhead	$ 250us-gaap_CostOfGoodsSoldOverhead
Foreign Currency Contract [Member]
Price Risk Management Activities (Textual)
Monetary notional amount of derivative liabilities	377us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
Foreign Currency Contract [Member] | Subsequent Event [Member]
Price Risk Management Activities (Textual)
Foreign currency commitments maturity date				Jan. 31, 2015
Gain (loss) recognized in income on derivatives				$ 12us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Fair Value Hedging [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_FairValueHedgingMember
Cash Flow Hedging [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Economic Hedging [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	7,532invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	5,676invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	46,886invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	20,815,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	94,920,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_SoybeanOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	80,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_SoybeanOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	67,600invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	46,585,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	178,920,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_SoybeanOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,155,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_SoybeanOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Economic Hedging [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,250,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Forward Contracts [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	25,327,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Economic Hedging [Member] | Forward Contracts [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,081,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = vlo_EconomicHedgingMember / us-gaap_EnergyAxis = vlo_GrainInBushelsMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	645invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	645invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_SwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	95,709invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	6,200,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	5,116invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	96,897invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	4,200,000invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	4,341invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = vlo_NaturalGasInBtusMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,900invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_LongMember
Trading Derivatives [Member] | Options Held [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,200invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearTwoMember / us-gaap_PositionAxis = us-gaap_ShortMember
Trading Derivatives [Member] | Options Held [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0invest_DerivativeNonmonetaryNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CommodityMember / us-gaap_EnergyAxis = us-gaap_CrudeOilMember / vlo_MaturityTimePeriodAxis = vlo_MaturityYearThreeMember / us-gaap_PositionAxis = us-gaap_ShortMember

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Indirect expenses and cost incurred associated with goods produced and sold during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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X

- Definition

Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-URI http://asc.fasb.org/extlink&oid=6519104

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- Definition

Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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