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Derivative Instruments and Hedging Activities (Details) (USD $)
Dec. 31, 2014
Apr. 01, 2014
Derivative disclosures    
Unrealized losses included in accumulated other comprehensive income, reclassified into natural gas and crude oil revenues , pre-tax   $ 73,400,000us-gaap_AccumulatedOtherComprehensiveIncomeLossBeforeTax1
Unrealized losses included in accumulated other comprehensive income, reclassified into natural gas and crude oil revenues , net of tax $ 0us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax $ 44,200,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Derivatives Designated as Hedges | Natural Gas Collars with contract period of January 2015 to December 2015    
Derivative disclosures    
Volume 70,900.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivatives Designated as Hedges | Natural Gas Collars with contract period of January 2015 to December 2015 | Minimum    
Derivative disclosures    
Collar Floor Price 3.86us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Collar Ceiling Price 4.27us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Derivatives Designated as Hedges | Natural Gas Collars with contract period of January 2015 to December 2015 | Maximum    
Derivative disclosures    
Collar Floor Price 3.91us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Collar Ceiling Price 4.33us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Derivatives Designated as Hedges | Natural Gas Collars with contract period of January 2015 to December 2015 | Weighted Average    
Derivative disclosures    
Collar Floor Price 3.87us-gaap_DerivativeFloorPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Collar Ceiling Price 4.35us-gaap_DerivativeCapPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasCollarswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of January 2015 to December 2015    
Derivative disclosures    
Volume 70,900.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivatives Designated as Hedges | Natural Gas Swaps with contract period of January 2015 to December 2015 | Weighted Average    
Derivative disclosures    
Swaps Weighted Average 3.92us-gaap_DerivativeSwapTypeAverageFixedPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapswithcontractperiodofJanuary2015toDecember2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Derivatives Designated as Hedges | Natural Gas Swaps With Contract Period Of January 2015 To March 2015    
Derivative disclosures    
Volume 5,200.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodOfJanuary2015ToMarch2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivatives Designated as Hedges | Natural Gas Swaps With Contract Period Of January 2015 To March 2015 | Weighted Average    
Derivative disclosures    
Swaps Weighted Average 4.62us-gaap_DerivativeSwapTypeAverageFixedPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodOfJanuary2015ToMarch2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Derivatives Designated as Hedges | Natural Gas Swaps With Contract Period of April 2015 To October 2015    
Derivative disclosures    
Volume 10,400.0cog_NonmonetaryNotionalAmountOfPriceRiskDerivatives1
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodofApril2015ToOctober2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Derivatives Designated as Hedges | Natural Gas Swaps With Contract Period of April 2015 To October 2015 | Weighted Average    
Derivative disclosures    
Swaps Weighted Average 3.86us-gaap_DerivativeSwapTypeAverageFixedPrice
/ us-gaap_DerivativeByNatureAxis
= cog_NaturalGasSwapsWithContractPeriodofApril2015ToOctober2015Member
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember