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Derivative Instruments and Hedging Activities 5 (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on derivative instruments	$ 137,603,000us-gaap_UnrealizedGainLossOnDerivatives		$ 0us-gaap_UnrealizedGainLossOnDerivatives		$ (494,000)us-gaap_UnrealizedGainLossOnDerivatives
Gain (loss) in derivative instruments not designated as hedges	145,891,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet		0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet		(494,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gain (loss) on derivative, net	75,116,000us-gaap_DerivativeGainLossOnDerivativeNet		57,002,000us-gaap_DerivativeGainLossOnDerivativeNet		235,832,000us-gaap_DerivativeGainLossOnDerivativeNet
Derivative Instruments, Additional Disclosures
Ineffectiveness related to derivative instruments	0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet		0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet		0us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
Derivatives Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	(70,775,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember		57,002,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember		236,326,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivatives Not Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on derivative instruments	137,603,000us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		0us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember		(494,000)us-gaap_UnrealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Natural gas | Derivatives Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	(70,557,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember		52,733,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember		225,108,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember
Natural gas | Derivatives Not Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	(73,020,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember	[1]	0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember	[1]	0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_NaturalGasRevenuesMember	[1]
Crude oil and condensate | Derivatives Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	(218,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember		4,269,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember		11,218,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember
Crude oil and condensate | Derivatives Not Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	(408,000)cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember	[1]	0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember	[1]	0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = cog_CrudeOilAndCondensateRevenuesMember	[1]
Gain (loss) on derivative instruments | Derivatives Not Designated as Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized gain (loss) on derivative instruments	$ 81,716,000cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember		$ 0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember		$ 0cog_RealizedGainLossOnDerivatives / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_IncomeStatementLocationAxis = us-gaap_GainLossOnDerivativeInstrumentsMember
[1] Relates entirely to the reclassification from accumulated other comprehensive income (loss) of previously frozen losses associated with derivatives that were de-designated as cash flow hedges on April 1, 2014.

X

- Definition

The realized gain (loss) on derivative instruments from the difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

No definition available.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

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-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The net gain (loss) recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

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

-Publisher FASB

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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