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DEBT - Other (Details) - Credit Agreements $ in Millions	Sep. 30, 2018 USD ($)
Debt
Percentage of change in the variable interest rates	0.125%
Effect of 1/8 percent change in annual interest expense	$ 3

X

- Definition

Represents the increase in annual interest expense due to 1/8 percent change in variable interest rate of debt during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the percentage of change in variable interest rate of debt during the period.

+ References

No definition available.

+ Details

Name:	crc_PercentageOfChangeInVariableInterestRateOfDebt
Namespace Prefix:	crc_
Data Type:	num:percentItemType
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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