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Derivatives - Cash-Flow Hedges (Details) ft³ in Billions | Dec. 31, 2017 ft³
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Derivatives |
Natural gas held in storage (in cubic feet) | 7
Forecast sale of natural gas from storage designated as cash-flow hedges (in cubic feet) | 7

X
- 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

X
- 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

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