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PENSION AND POSTRETIREMENT BENEFIT PLANS - Defined Benefit Plan (Details) | Dec. 31, 2020 employee
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Pension Benefits |
Postretirement and Other Benefit Plans Disclosure |
Number of employees accruing benefits under defined benefit plans | 70

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |