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JOINT VENTURES - MIRA (Details) - Joint venture with MIRA - MIRA $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Apr. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
JOINT VENTURES
Maximum commitment contribution		$ 300
Working interest acquired by MIRA (as a percent)		90.00%
Funding provided by MIRA for development of properties (as a percent)		100.00%
Working interest retained by CRC (as a percent)		10.00%
CRC's working interest if MIRA receives cash distributions equal to a predetermined threshold return (as a percent)		75.00%
Initial commitment		$ 160
Reduced commitment amount	$ 140
Maximum percentage of program amount	110
Commitment contributed				$ 46	$ 58
Expected
JOINT VENTURES
Commitment contributed			$ 11

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- Definition

Represents the initial investment commitment in the joint venture.

+ References

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- Definition

Percentage of funding provided to a joint venture to achieve its goals per agreement.

+ References

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- Definition

Working interest in exchange for an investment in a joint venture.

+ References

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+ Details

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- Definition

The working interest that reverts to the entity when the targeted rate of return of the counterparty is achieved.

+ References

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- Definition

Percentage of working interest retained in certain properties in a joint venture agreement with another property to develop certain properties owned by the entity.

+ References

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- Definition

The maximum percentage of commitment of program amount.

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- Definition

The amount of reduction in committed amounts of initial investment.

+ References

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- Definition

Represents the total maximum investment commitment in the joint venture.

+ References

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- 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.

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- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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