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REVENUE RECOGNITION - Commodity Sales Contracts (Details)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Typical term of payment following invoicing	30 days

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- Definition

Term of payment following invoicing for contracts with customers, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	crc_TermOfPaymentAfterInvoicingForContractsWithCustomers
Namespace Prefix:	crc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration