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Derivatives (Details 4) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Gross and net fair values of outstanding derivatives (in millions)    
Less: counterparty netting and cash collateral, asset $ (742)oxy_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCounterpartyNettingAndCashCollateral $ (329)oxy_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCounterpartyNettingAndCashCollateral
Less: counterparty netting and cash collateral, liability (756)oxy_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCounterpartyNettingAndCashCollateral (364)oxy_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCounterpartyNettingAndCashCollateral
Total net fair value, asset 97us-gaap_DerivativeAssets 51us-gaap_DerivativeAssets
Total net fair value, liability 240us-gaap_DerivativeLiabilities 58us-gaap_DerivativeLiabilities
Collateral received netted against derivative assets 0oxy_PayablesInRespectOfCollateralReceivedNet 11oxy_PayablesInRespectOfCollateralReceivedNet
Collateral paid netted against derivative liabilities 8oxy_ReceivablesInRespectOfCollateralPaidNet 46oxy_ReceivablesInRespectOfCollateralPaidNet
Collateral deposited with clearinghouses and brokers 44oxy_CollateralDepositedWithClearingHousesAndBrokers 103oxy_CollateralDepositedWithClearingHousesAndBrokers
Credit risk contingent features    
Net derivative liabilities with credit-risk-contingent features 4us-gaap_DerivativeNetLiabilityPositionAggregateFairValue 8us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Amount of collateral posted 3us-gaap_CollateralAlreadyPostedAggregateFairValue 23us-gaap_CollateralAlreadyPostedAggregateFairValue
Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 839us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
380us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Commodity contract derivative liability, gross 996us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
422us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
Cash-flow hedges | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross   4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Cash-flow hedges | Commodity Contracts | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross   4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not designated as hedging instruments | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 839us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
380us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Commodity contract derivative liability, gross 996us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
418us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Commodity Contracts | Other current assets    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 828us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
367us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Commodity Contracts | Long-term receivables and other assets, net    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 11us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= oxy_LongTermReceivablesAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
13us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= oxy_LongTermReceivablesAndOtherAssetsNetMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Commodity Contracts | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 886us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
407us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Commodity Contracts | Deferred credits and other liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross $ 110us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= oxy_DeferredCreditsAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 11us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= oxy_DeferredCreditsAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember