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DEBT - 2014 Revolving Credit Facility (Details) - USD ($) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 18, 2020 | Mar. 31, 2020 | May 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019
Debt |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 1,000,000,000 |  |  |
Available liquidity |  | 395,000,000 |  |  |
Unrestricted cash |  | 67,000,000 |  |  |
2014 Revolving Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Available borrowing capacity before a month-end minimum liquidity requirement |  | 328,000,000 |  |  |
Financial covenant minimum month end liquidity |  | 150,000,000 |  |  |
Borrowing base |  | 2,300,000,000 |  |  |
Letters of Credit | 2014 Revolving Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Maximum sub-limit on borrowing capacity for issuance of letters of credit |  | 400,000,000 |  |  | $ 400,000,000
Aggregate letters of credit issued |  | $ 165,000,000 |  |  | $ 165,000,000
Subsequent Event |  |  |  |  |
Debt |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 900,000,000 |
Available liquidity |  |  | $ 165,000,000 |  |
Unrestricted cash |  |  | 148,000,000 |  |
Subsequent Event | 2014 Revolving Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Available borrowing capacity before a month-end minimum liquidity requirement |  |  | 17,000,000 |  |
Borrowing base | $ 1,200,000,000 |  |  |  |
Subsequent Event | Letters of Credit | 2014 Revolving Credit Facility |  |  |  |  |
Debt |  |  |  |  |
Aggregate letters of credit issued |  |  | $ 152,000,000 | $ 152,000,000 |

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- Definition Available Liquidity + References No definition available. + Details
Name: | crc_AvailableLiquidity
Namespace Prefix: | crc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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 Unrestricted Cash + References No definition available. + Details
Name: | crc_UnrestrictedCash
Namespace Prefix: | crc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
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Balance Type: |
Period Type: |

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- Details
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