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Statement of Consolidated Cash Flows (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ (389)us-gaap_ProfitLoss $ 421us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities    
(Gains) losses on asset sales, net   (10)us-gaap_GainLossOnSaleOfOilAndGasProperty
Depreciation, depletion and amortization 956us-gaap_DepreciationDepletionAndAmortization 726us-gaap_DepreciationDepletionAndAmortization
Loss from equity affiliates   93us-gaap_GainLossOnSaleOfEquityInvestments
Exploratory dry hole costs 169us-gaap_ExplorationAbandonmentAndImpairmentExpense 9us-gaap_ExplorationAbandonmentAndImpairmentExpense
Exploration lease impairment 54us-gaap_ImpairmentOfLeasehold 32us-gaap_ImpairmentOfLeasehold
Stock compensation expense 26us-gaap_ShareBasedCompensation 22us-gaap_ShareBasedCompensation
Provision (benefit) for deferred income taxes (347)us-gaap_DeferredIncomeTaxExpenseBenefit 112us-gaap_DeferredIncomeTaxExpenseBenefit
(Income) loss from discontinued operations, net of income taxes 13us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (57)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Changes in operating assets and liabilities (109)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (231)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Cash provided by (used in) operating activities - continuing operations 373us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 1,117us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash provided by (used in) operating activities - discontinued operations (11)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 41us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by (used in) operating activities 362us-gaap_NetCashProvidedByUsedInOperatingActivities 1,158us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (1,237)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,146)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from asset sales   1,237us-gaap_ProceedsFromSaleOfProductiveAssets
Other, net (10)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (57)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Cash provided by (used in) investing activities - continuing operations (1,247)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations 34us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash provided by (used in) investing activities - discontinued operations 95us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations (296)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash provided by (used in) investing activities (1,152)us-gaap_NetCashProvidedByUsedInInvestingActivities (262)us-gaap_NetCashProvidedByUsedInInvestingActivities
Debt with maturities of greater than 90 days    
Repayments (17)us-gaap_RepaymentsOfLongTermDebt (333)us-gaap_RepaymentsOfLongTermDebt
Common stock acquired and retired (67)us-gaap_PaymentsForRepurchaseOfCommonStock (1,043)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid (72)us-gaap_PaymentsOfDividends (79)us-gaap_PaymentsOfDividends
Employee stock options exercised, including income tax benefits 8us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation 33us-gaap_ProceedsAndExcessTaxBenefitFromSharebasedCompensation
Cash provided by (used in) financing activities - continuing operations (148)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,422)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net cash provided by (used in) financing activities (148)us-gaap_NetCashProvidedByUsedInFinancingActivities (1,422)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (938)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (526)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR 2,444us-gaap_CashAndCashEquivalentsAtCarryingValue 1,814us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 1,506us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,288us-gaap_CashAndCashEquivalentsAtCarryingValue