Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
Total future drilling commitments at balance sheet date	$ 610
Drilling commitments 2015	246clr_DrillingCommitmentsYearOne
Drilling commitments 2016	212clr_DrillingCommitmentsYearTwo
Drilling commitments 2017	123clr_DrillingCommitmentsYearThree
Drilling commitments 2018	29clr_DrillingCommitmentsYearFour
Damages claimed related to contingency matter	165
Legal proceedings recorded as a liability under other noncurrent liabilities	2.9us-gaap_LitigationReserve	1.7us-gaap_LitigationReserve
Future Drilling Commitments End Date	2018-07
Pipeline Transportation Commitments [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, end date	2025
Future commitment, total	969
Future commitment, due in 2015	182
Future commitment, due in 2016	187
Future commitment, due in 2017	181
Future commitment, due in 2018	176
Future commitment, due in 2019	140
Future commitments, thereafter	103
Non-operational Pipeline Transportation Commitments[Member]
Long-term Purchase Commitment [Line Items]
Future commitment, in years	5 years
Future commitment, total	260
Fuel [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, total	96
Future commitment, due in 2015	64
Future commitment, due in 2016	32
Affiliated Entity [Member]
Long-term Purchase Commitment [Line Items]
Contractual Obligation	96
Affiliated Entity [Member] \| Pipeline Transportation Commitments [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, total	$ 96

Drilling Commitments Year Four

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- Definition

Drilling commitments year one

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No definition available.

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- Definition

Drilling Commitments Year Three

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- Definition

Drilling Commitments Year Two

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- Definition

Total future drilling commitments at balance sheet date

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Future Drilling Commitments End Date

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- Definition

Purchase Obligation Agreement Expiration Date

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- Definition

Value of Transportation Commitment with Affiliate

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No definition available.

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- Definition

Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

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Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

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Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

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Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

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