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Derivatives (Details 1) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Gross and net fair values of outstanding derivatives (in millions)    
Collateral paid netted against derivative liabilities $ 19oxy_ReceivablesInRespectOfCollateralPaidNet $ 8oxy_ReceivablesInRespectOfCollateralPaidNet
Collateral deposited with clearinghouses and brokers 11oxy_CollateralDepositedWithClearingHousesAndBrokers 44oxy_CollateralDepositedWithClearingHousesAndBrokers
Credit risk contingent features    
Net derivative liabilities with credit-risk-contingent features 1us-gaap_DerivativeNetLiabilityPositionAggregateFairValue 4us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Amount of collateral posted 0us-gaap_CollateralAlreadyPostedAggregateFairValue 3us-gaap_CollateralAlreadyPostedAggregateFairValue
Cash-flow hedges | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross   996us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Not designated as hedging instruments    
Gross and net fair values of outstanding derivatives (in millions)    
Less: counterparty netting and cash collateral, asset (331)oxy_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCounterpartyNettingAndCashCollateral
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
(742)oxy_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCounterpartyNettingAndCashCollateral
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Less: counterparty netting and cash collateral, liability (349)oxy_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCounterpartyNettingAndCashCollateral
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
(756)oxy_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCounterpartyNettingAndCashCollateral
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Total net fair value, asset 82us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
97us-gaap_DerivativeAssets
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Total net fair value, liability 234us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
240us-gaap_DerivativeLiabilities
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Other current assets    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 403us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
828us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Long-term receivables and other assets, net    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 10us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= oxy_LongTermReceivablesAndOtherAssetsNetMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
11us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= oxy_LongTermReceivablesAndOtherAssetsNetMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Accrued liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 415us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
886us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccruedLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Deferred credits and other liabilities    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative liability, gross 168us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= oxy_DeferredCreditsAndOtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
110us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= oxy_DeferredCreditsAndOtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not designated as hedging instruments | Commodity Contracts    
Gross and net fair values of outstanding derivatives (in millions)    
Commodity contract derivative asset, gross 413us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
839us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Commodity contract derivative liability, gross $ 583us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
$ 996us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember