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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - DEFINED BENEFIT PLANS (Details) | Dec. 31, 2018 employee
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Domestic |
DEFINED BENEFIT PLANS |
Number of employees accruing benefits under defined benefit plans | 400
Foreign |
DEFINED BENEFIT PLANS |
Number of employees accruing benefits under defined benefit plans | 1,000

X
- Definition This element represents the number of employees currently accruing benefits under defined benefit plans. + References No definition available. + Details
Name: | oxy_DefinedBenefitPlanNumberOfParticipatingEmployees
Namespace Prefix: | oxy_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |