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Asset Acquisitions, Dispositions and Other (Details) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
May 15, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
acre
Dec. 31, 2012
May 31, 2013
Nov. 30, 2014
Oct. 31, 2013
Nov. 30, 2014
Apr. 30, 2014
Feb. 28, 2014
Acquistions, dispositions and other transactions                      
Gain on sale of assets and equity investments   $ 2,505,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal $ 1,175,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal                
Total portion of construction costs     23,000,000oxy_TotalProjectAmount                
Charge for former employees and consultants 55,000,000oxy_PostEmploymentBenefitCharge                    
Spin-off California Resources Corp                      
Acquistions, dispositions and other transactions                      
Percentage of common stock distributed             81.30%oxy_PercentageOfCommonStockDistributed
/ us-gaap_RestructuringPlanAxis
= us-gaap_SpinoffMember
  81.30%oxy_PercentageOfCommonStockDistributed
/ us-gaap_RestructuringPlanAxis
= us-gaap_SpinoffMember
   
Permian region                      
Acquistions, dispositions and other transactions                      
Cash paid on acquisition   1,300,000,000oxy_CostOfAcquiredBusinessAssets
/ us-gaap_StatementGeographicalAxis
= oxy_PermianRegionMember
  1,300,000,000oxy_CostOfAcquiredBusinessAssets
/ us-gaap_StatementGeographicalAxis
= oxy_PermianRegionMember
             
Number of acres acquired       100,000oxy_BusinessAcquisitionNumberOfAcresAcquired
/ us-gaap_StatementGeographicalAxis
= oxy_PermianRegionMember
             
Acquisition of oil and gas properties         1,900,000,000us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
/ us-gaap_StatementGeographicalAxis
= oxy_PermianRegionMember
           
Domestic Oil and Gas Properties                      
Acquistions, dispositions and other transactions                      
Acquisition of oil and gas properties     500,000,000us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
/ us-gaap_StatementGeographicalAxis
= oxy_DomesticOilAndGasPropertiesMember
               
Brazilian chemical facility                      
Acquistions, dispositions and other transactions                      
Pre-tax proceeds from sale of assets           270,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_BrazilianChemicalJointVentureMember
         
Gain on sale of assets and equity investments           131,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_BrazilianChemicalJointVentureMember
         
General Partner of Plains All American Pipeline,L.P                      
Acquistions, dispositions and other transactions                      
Sale of equity investment             1,700,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_GeneralPartnerOfPlainsAllAmericanPipelineMember
1,400,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_GeneralPartnerOfPlainsAllAmericanPipelineMember
     
Gain on sale of assets and equity investments             1,400,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_GeneralPartnerOfPlainsAllAmericanPipelineMember
1,000,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_GeneralPartnerOfPlainsAllAmericanPipelineMember
     
Ingleside                      
Acquistions, dispositions and other transactions                      
Ethylene production capacity of ethane steam cracking unit, per year (in pounds)               1,200,000,000oxy_PerYearEthyleneProductionCapacityOfEthaneSteamCrackingUnit
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oxy_InglesideEthyleneLLCMember
     
BridgeTex                      
Acquistions, dispositions and other transactions                      
Number of transactions involved in sale             2oxy_NumberOfTransactionsInvolvedInSale
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
       
Sale of equity investment             1,075,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
  75,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Gain on sale of assets and equity investments   633,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
            633,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Hugoton Field operations                      
Acquistions, dispositions and other transactions                      
Pre-tax proceeds from sale of assets                   1,300,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= oxy_HugotonFieldOperationsMember
1,400,000,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= oxy_HugotonFieldOperationsMember
Pre-tax gain on sale   $ 531,000,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= oxy_HugotonFieldOperationsMember
              $ 531,000,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= oxy_HugotonFieldOperationsMember