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

X

- 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

X

- 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

X

- Details

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