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DEBT - 2014 Revolving Credit Facility (Details) - 2014 Revolving Credit Facility - USD ($) $ in Millions	1 Months Ended
	Oct. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt
Available borrowing capacity, subject to minimum liquidity requirement		$ 490
Minimum month end liquidity		150
Borrowing base	$ 2,300
Letters of Credit
Debt
Maximum sub-limit on borrowing capacity for issuance of letters of credit		400	$ 400
Aggregate letters of credit issued		$ 167	$ 148

X

- Definition

The amount of money that maybe borrowed based on the value of the collateral the entity pledges.

+ References

No definition available.

+ Details

Name:	crc_DebtBorrowingBase
Namespace Prefix:	crc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of minimum monthly liquidity required to maintain, per debt covenant agreement.

+ References

No definition available.

+ Details

Name:	crc_DebtInstrumentCovenantMinimumMonthlyLiquidity
Namespace Prefix:	crc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Maximum borrowing capacity of letters of credit as sub-limit of the main credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	crc_LineOfCreditFacilityMaximumBorrowingCapacityLettersOfCreditSublimit
Namespace Prefix:	crc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: