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DEBT - Net Deferred Gain and Issuance Costs (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Debt Disclosure [Abstract] |  |
Deferred gain | $ 193 | $ 211
Issuance costs and original issue discounts | (58) | (65)
Net deferred gain and issuance costs | $ 135 | $ 146

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- Definition The amount of debt premium that was originally recognized on exchange of the instrument that has yet to be amortized. + References No definition available. + Details
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Namespace Prefix: | crc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying value as of the balance sheet of the deferred gain (loss) and issuance costs, net. + References No definition available. + Details
Name: | crc_DeferredGainLossAndIssuanceCostsNet
Namespace Prefix: | crc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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