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JOINT VENTURES - Subsequent Events (Details) - Subsequent Events $ in Millions	1 Months Ended
	Oct. 31, 2018 USD ($) item
JOINT VENTURES
Number of joint ventures entered into | item	3
Maximum commitment contribution	$ 13
Investment commitment period	3 years
Exploration joint ventures partners
JOINT VENTURES
Maximum commitment contribution	$ 35

X

- Definition

Represents investment period for the initial commitment in a joint venture, 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_JointVentureInitialInvestmentInvestmentPeriod
Namespace Prefix:	crc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of joint ventures entered into by the entity.

+ References

No definition available.

+ Details

Name:	crc_NumberOfJointVenturesEntered
Namespace Prefix:	crc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the total maximum investment commitment in the joint venture.

+ References

No definition available.

+ Details

Name:	crc_TotalInvestmentCommitmentInJointVentureMaximum
Namespace Prefix:	crc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=crc_ExplorationJointVenturesPartnersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: