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JOINT VENTURES - Elk Hills Carbon (Details) $ in Millions	1 Months Ended
	Jan. 31, 2020 USD ($)
OGCI | Elk Hills Carbon JV
Business Acquisition [Line Items]
Partnership contribution	$ 2

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

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

X

- Definition

The cash inflow from the capital received in cash from a partner in a partnership during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Details

Name:	srt_OwnershipAxis=crc_ElkHillsCarbonMember
Namespace Prefix:
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Balance Type:
Period Type: