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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOW FROM OPERATING ACTIVITIES    
Net income (loss) $ (218)us-gaap_ProfitLoss $ 1,392us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Discontinued operations, net 3us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (255)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Depreciation, depletion and amortization of assets 1,029us-gaap_DepreciationDepletionAndAmortization 977us-gaap_DepreciationDepletionAndAmortization
Deferred income tax provision (63)us-gaap_DeferredIncomeTaxExpenseBenefit 125us-gaap_DeferredIncomeTaxExpenseBenefit
Other noncash charges to income 106us-gaap_OtherNoncashExpense 42us-gaap_OtherNoncashExpense
Asset impairments 236us-gaap_AssetImpairmentCharges  
Loss on sale of assets 24us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal  
Undistributed earnings from equity investments 3us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 3us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Dry hole expenses 1us-gaap_ExplorationAbandonmentAndImpairmentExpense 10us-gaap_ExplorationAbandonmentAndImpairmentExpense
Changes in operating assets and liabilities, net (555)us-gaap_IncreaseDecreaseInOperatingCapital (252)us-gaap_IncreaseDecreaseInOperatingCapital
Operating cash flow from continuing operations 566us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 2,042us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Operating cash flow from discontinued operations (5)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations 655us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by operating activities 561us-gaap_NetCashProvidedByUsedInOperatingActivities 2,697us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOW FROM INVESTING ACTIVITIES    
Capital expenditures (1,675)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,794)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Change in capital accrual (458)oxy_IncreaseDecreaseInCapitalAccrual  
Payments for purchases of assets and businesses (6)oxy_PurchaseOfAssetsNet (4)oxy_PurchaseOfAssetsNet
Sale of assets, net 20oxy_ProceedsFromDivestitureOfBusinessesAndSaleOfPropertyPlantAndEquipmentNet  
Other, net (87)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (96)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Investing cash flow from continuing operations (2,206)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (1,894)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Investing cash flow from discontinued operations   (479)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash used by investing activities (2,206)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,373)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOW FROM FINANCING ACTIVITIES    
Change in restricted cash 754us-gaap_IncreaseDecreaseInRestrictedCashAndInvestments  
Payment of long-term debt   (61)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of common stock 19us-gaap_ProceedsFromIssuanceOfCommonStock 13us-gaap_ProceedsFromIssuanceOfCommonStock
Purchases of treasury stock (207)us-gaap_PaymentsForRepurchaseOfCommonStock (946)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends paid (557)us-gaap_PaymentsOfDividendsCommonStock (514)us-gaap_PaymentsOfDividendsCommonStock
Contributions from noncontrolling interest   123oxy_ContributionsFromDistributionsToNoncontrollingInterest
Net cash provided (used by) financing activities 9us-gaap_NetCashProvidedByUsedInFinancingActivities (1,385)us-gaap_NetCashProvidedByUsedInFinancingActivities
Decrease in cash and cash equivalents (1,636)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,061)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents-beginning of period 3,789us-gaap_CashAndCashEquivalentsAtCarryingValue 3,393us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents-end of period $ 2,153us-gaap_CashAndCashEquivalentsAtCarryingValue $ 2,332us-gaap_CashAndCashEquivalentsAtCarryingValue