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Environmental Liabilities and Expenditures (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
site
Environmental Liabilities and Expenditures  
Environmental remediation reserves, current, included in accrued liabilities $ 79us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Environmental remediation reserves, noncurrent, included in deferred credits and other liabilities - other 245us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Environmental remediation reserves  
Number of Sites 146oxy_EnvironmentalRemediationSitesNumber
Reserve Balance 324us-gaap_AccrualForEnvironmentalLossContingencies
Environmental reserves, exceeding $ ten million, threshold value 10oxy_EnvironmentalReservesExceedingTenMillionThresholdValueSiteCategory
Environmental reserves, range between zero to $ one million site category, number of sites 99oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionSiteCategoryNumberOfSites
Minimum period of expending second half of environmental reserves 10 years
Low end of range  
Environmental remediation reserves  
Environmental reserves, exceeding $ ten million, number of sites 11oxy_EnvironmentalReservesExceedingTenMillionSiteCategoryNumberOfSites
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Environmental reserves, range between zero to $ one million site category 1oxy_EnvironmentalReservesRangeBetweenZeroToOneMillionThresholdValueSiteCategory
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Period of expending first half of environmental reserves 3 years
High end of range  
Environmental remediation reserves  
Period of expending first half of environmental reserves 4 years
Environmental remediation additional loss range 385oxy_EnvironmentalRemediationPossibleAdditionalLossBeyondAccruals
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
NPL sites  
Environmental remediation reserves  
Number of Sites 31oxy_EnvironmentalRemediationSitesNumber
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_NPLSitesMember
Reserve Balance 22us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_NPLSitesMember
Third-party sites  
Environmental remediation reserves  
Number of Sites 66oxy_EnvironmentalRemediationSitesNumber
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_ThirdPartySitesMember
Reserve Balance 95us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_ThirdPartySitesMember
Occidental-operated sites  
Environmental remediation reserves  
Number of Sites 17oxy_EnvironmentalRemediationSitesNumber
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_EntityOperatedSitesMember
Reserve Balance 108us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_EntityOperatedSitesMember
Closed or non-operated Occidental sites  
Environmental remediation reserves  
Number of Sites 32oxy_EnvironmentalRemediationSitesNumber
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_ClosedOrNonOperatedEntitySitesMember
Reserve Balance $ 99us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_EnvironmentalRemediationSiteAxis
= oxy_ClosedOrNonOperatedEntitySitesMember