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Valero Energy Partners LP (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 01, 2014 | Dec. 16, 2013 | Dec. 31, 2011
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Net proceeds from initial public offering of common units of Valero Energy Partners LP | $ 0 us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits | $ 369 us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits | $ 0 us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits |  |  |
Cash and temporary cash investments | 3,689 us-gaap_CashAndCashEquivalentsAtCarryingValue | 4,292 us-gaap_CashAndCashEquivalentsAtCarryingValue | 1,723 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  | 1,024 us-gaap_CashAndCashEquivalentsAtCarryingValue
Noncontrolling interests | 567 us-gaap_MinorityInterest | 486 us-gaap_MinorityInterest |  |  |  |
Valero Energy Partners LP [Member] |  |  |  |  |  |
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Cash and temporary cash investments | 237 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember | 375 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember |  |  |  |
Noncontrolling interests | 375 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember | 370 us-gaap_MinorityInterest / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember |  |  |  |
Valero Energy Partners LP [Member] | Texas Crude Systems Business [Member] |  |  |  |  |  |
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Proceeds from sale of property, plant, and equipment |  |  |  | 154 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / us-gaap_RelatedPartyTransactionAxis = vlo_TexasCrudeSystemsBusinessMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember |  |
Limited Partner [Member] |  |  |  |  |  |
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 68.60%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_LimitedPartnerMember | 68.60%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_LimitedPartnerMember |  |  |  |
Noncontrolling interest, ownership percentage by public | 29.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_LimitedPartnerMember | 29.40%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_LimitedPartnerMember |  |  |  |
General Partner [Member] |  |  |  |  |  |
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 2.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember | 2.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember |  |  |  |
Offering [Member] | Valero Energy Partners LP [Member] |  |  |  |  |  |
Noncontrolling Interest Transactions Textual [Abstract] |  |  |  |  |  |
Common units sold in the Offering |  |  |  |  | 17,250,000 us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Common unit price per unit |  |  |  |  | $ 23.00 us-gaap_SaleOfStockPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Net proceeds from initial public offering of common units of Valero Energy Partners LP |  |  |  |  | $ 369 us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = vlo_ValeroEnergyPartnersLPMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |

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