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Lawsuits, Claims, Commitments and Contingencies (Details) (Diamond Shamrock Chemicals Company, USD $)
In Millions, unless otherwise specified
 1 Months Ended
Feb. 28, 2015
Apr. 30, 2015
Dec. 31, 2014
Long-term Purchase Commitment      
Payments related to settlement $ 70us-gaap_LossContingencyAccrualCarryingValuePayments    
Subsequent event
      
Long-term Purchase Commitment      
Payments related to settlement   60us-gaap_LossContingencyAccrualCarryingValuePayments
/ us-gaap_BusinessAcquisitionAxis
= oxy_DiamondShamrockChemicalsCompanyMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Settlement
      
Long-term Purchase Commitment      
Litigation Settlement, Amount     $ 190us-gaap_LitigationSettlementAmount
/ us-gaap_BusinessAcquisitionAxis
= oxy_DiamondShamrockChemicalsCompanyMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember