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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash flows from operating activities:      
Net income $ 3,711us-gaap_ProfitLoss $ 2,728us-gaap_ProfitLoss $ 2,080us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 1,690us-gaap_DepreciationDepletionAndAmortization 1,720us-gaap_DepreciationDepletionAndAmortization 1,574us-gaap_DepreciationDepletionAndAmortization
Aruba Refinery asset retirement expense and other 63us-gaap_AccretionExpenseIncludingAssetRetirementObligations 0us-gaap_AccretionExpenseIncludingAssetRetirementObligations 0us-gaap_AccretionExpenseIncludingAssetRetirementObligations
Gain on disposition of retained interest in CST Brands, Inc. 0us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee (325)us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee 0us-gaap_GainOrLossOnSaleOfPreviouslyUnissuedStockByEquityInvestee
Asset impairment losses 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 1,014us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Stock-based compensation expense 60us-gaap_ShareBasedCompensation 64us-gaap_ShareBasedCompensation 58us-gaap_ShareBasedCompensation
Deferred income tax expense 445us-gaap_DeferredIncomeTaxesAndTaxCredits 501us-gaap_DeferredIncomeTaxesAndTaxCredits 963us-gaap_DeferredIncomeTaxesAndTaxCredits
Changes in current assets and current liabilities (1,810)us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet 922us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet (302)us-gaap_IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet
Changes in deferred charges and credits and other operating activities, net 82us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet (46)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet (117)us-gaap_IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet
Net cash provided by operating activities 4,241us-gaap_NetCashProvidedByUsedInOperatingActivities 5,564us-gaap_NetCashProvidedByUsedInOperatingActivities 5,270us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Capital expenditures (2,153)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,121)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,931)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Deferred turnaround and catalyst costs (649)us-gaap_PaymentsForCapitalImprovements (634)us-gaap_PaymentsForCapitalImprovements (479)us-gaap_PaymentsForCapitalImprovements
Proceeds from the sale of the Paulsboro Refinery 0us-gaap_ProceedsFromCollectionOfNotesReceivable 0us-gaap_ProceedsFromCollectionOfNotesReceivable 160us-gaap_ProceedsFromCollectionOfNotesReceivable
Other investing activities, net (42)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (57)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (101)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (2,844)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,812)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,351)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Proceeds from debt borrowings 28us-gaap_ProceedsFromIssuanceOfLongTermDebt 0us-gaap_ProceedsFromIssuanceOfLongTermDebt 2,900us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of debt (200)us-gaap_RepaymentsOfLongTermDebt (480)us-gaap_RepaymentsOfLongTermDebt (3,612)us-gaap_RepaymentsOfLongTermDebt
Proceeds from the exercise of stock options 47us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 59us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 59us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Purchase of common stock for treasury (1,296)us-gaap_PaymentsForRepurchaseOfCommonStock (928)us-gaap_PaymentsForRepurchaseOfCommonStock (281)us-gaap_PaymentsForRepurchaseOfCommonStock
Common stock dividends (554)us-gaap_PaymentsOfDividendsCommonStock (462)us-gaap_PaymentsOfDividendsCommonStock (360)us-gaap_PaymentsOfDividendsCommonStock
Net proceeds from initial public offering of common units of Valero Energy Partners LP 0us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits 369us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits 0us-gaap_ProceedsFromIssuanceOfCommonLimitedPartnersUnits
Contributions from noncontrolling interests 12us-gaap_ProceedsFromMinorityShareholders 45us-gaap_ProceedsFromMinorityShareholders 44us-gaap_ProceedsFromMinorityShareholders
Distributions to public unitholders of Valero Energy Partners LP (12)us-gaap_PaymentsOfDividendsMinorityInterest 0us-gaap_PaymentsOfDividendsMinorityInterest 0us-gaap_PaymentsOfDividendsMinorityInterest
Disposition of retail business:      
Proceeds from short-term debt in anticipation of separation 0us-gaap_ProceedsFromBankDebt 550us-gaap_ProceedsFromBankDebt 0us-gaap_ProceedsFromBankDebt
Cash distributed to Valero by CST Brands, Inc. 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 500us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries 0us-gaap_ProceedsFromDivestitureOfInterestInConsolidatedSubsidiaries
Cash held and retained by CST Brands, Inc. upon separation 0us-gaap_CashDivestedFromDeconsolidation (315)us-gaap_CashDivestedFromDeconsolidation 0us-gaap_CashDivestedFromDeconsolidation
Proceeds from short-term debt related to disposition of retained interest 0us-gaap_ProceedsFromOtherShortTermDebt 525us-gaap_ProceedsFromOtherShortTermDebt 0us-gaap_ProceedsFromOtherShortTermDebt
Repayments of short-term debt related to disposition of retained interest 0us-gaap_RepaymentsOfOtherShortTermDebt (58)us-gaap_RepaymentsOfOtherShortTermDebt 0us-gaap_RepaymentsOfOtherShortTermDebt
Other financing activities, net 45us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 32us-gaap_ProceedsFromPaymentsForOtherFinancingActivities 17us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities (1,930)us-gaap_NetCashProvidedByUsedInFinancingActivities (163)us-gaap_NetCashProvidedByUsedInFinancingActivities (1,233)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of foreign exchange rate changes on cash (70)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (20)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 13us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and temporary cash investments (603)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,569us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 699us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and temporary cash investments at beginning of year 4,292us-gaap_CashAndCashEquivalentsAtCarryingValue 1,723us-gaap_CashAndCashEquivalentsAtCarryingValue 1,024us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and temporary cash investments at end of year $ 3,689us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,292us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,723us-gaap_CashAndCashEquivalentsAtCarryingValue