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Derivatives - Cash Flow Hedges (Details) - Bcf | Mar. 31, 2019 | Dec. 31, 2018
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Natural gas held in storage (in cubic feet) | 1 | 5
Forecast sale of natural gas from storage designated as cash-flow hedges (in cubic feet) |  | 4

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- Definition This element represents the forecast sales volume of natural gas from storage in billion cubic feet designated as cash flow hedges. + References No definition available. + Details
Name: | oxy_DesignatedForecastSaleOfNaturalGasAsCashFlowHedges
Namespace Prefix: | oxy_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of natural gas held in storage, in billion cubic feet. + References No definition available. + Details
Name: | oxy_NaturalGasHeldInStorage
Namespace Prefix: | oxy_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | instant

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