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LEASES - Narrative (Details) | 12 Months Ended
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Dec. 31, 2020 option contract
Leases [Abstract] |
Number of finance lease contracts | contract | 2
Number of sublease extension options | option | 0

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- Definition Lessee, Finance Lease, Number Of Lease Contracts + References No definition available. + Details
Name: | crc_LesseeFinanceLeaseNumberOfLeaseContracts
Namespace Prefix: | crc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessee, Sublease, Renewal Option + References No definition available. + Details
Name: | crc_LesseeSubleaseRenewalOption
Namespace Prefix: | crc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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