Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
Nov. 30, 2010	Mar. 31, 2015
Long-term Purchase Commitment [Line Items]
Total future drilling commitments at balance sheet date		$ 564
Drilling commitments due remainder of current year		186clr_DrillingCommitmentsYearOne
Drilling commitments Year Two		220clr_DrillingCommitmentsYearTwo
Drilling Commitments Year Three		125clr_DrillingCommitmentsYearThree
Drilling Commitments Year Four		33clr_DrillingCommitmentsYearFour
Future Drilling Commitments End Date		2018-09
Loss related to contingency damages	165
Legal proceedings recorded as a liability under other noncurrent liabilities		(2.9)us-gaap_LitigationReserve
Fuel Purchase Commitment End Date		2016-01
Pipeline Transportation Commitments [Member]
Long-term Purchase Commitment [Line Items]
Pipeline commitments, end date		2025
Purchase Obligation, total		1,000
Purchase Obligation, due in remainder of current year		153
Purchase Obligation, due second year		207
Purchase Obligation, due third year		201
Purchase Obligation, due fourth year		195
Purchase Obligation, due fifth year		159
Purchase Obligation, Due after Fifth Year		109
Non-operational [Member]
Long-term Purchase Commitment [Line Items]
Crude oil non-op transportation commitment, total		260
Fuel [Member]
Long-term Purchase Commitment [Line Items]
Purchase Obligation, total		75
Purchase Obligation, Due in Next Twelve Months		44
Purchase Obligation, due second year		$ 31

Drilling Commitments Year Four

No definition available.

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- Definition

Drilling commitments year one

+ References

No definition available.

+ Details

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- Definition

Drilling Commitments Year Three

+ References

No definition available.

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- Definition

Drilling Commitments Year Two

+ References

No definition available.

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- Definition

Fuel Purchase Commitment End Date

+ References

No definition available.

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- Definition

Total future drilling commitments at balance sheet date

+ References

No definition available.

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- Definition

Future Drilling Commitments End Date

+ References

No definition available.

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- Definition

Purchase Obligation Agreement Expiration Date

+ References

No definition available.

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- Definition

Purchase Obligation Due In Remainder Of Current Year

+ References

No definition available.

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- Definition

Total Value Of Pipeline Transportation Commitments

+ References

No definition available.

+ Details

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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.

+ References

+ Details

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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

-Section 50

-Paragraph 1

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-Publisher FASB

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-Topic 450

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-Section 50

-Paragraph 9

-Subparagraph (a)

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

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

No definition available.

+ Details

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