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Stock-Based Compensation (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
2012 Hybrid Performance Share Awards | Percent vesting on first year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period     33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2012HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
2012 Hybrid Performance Share Awards | Percent vesting on second year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period     33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2012HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
2012 Hybrid Performance Share Awards | Percent vesting on third year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period     33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2012HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
2013 Hybrid Performance Share Awards | Percent vesting on first year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period   25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2013HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember		  
2013 Hybrid Performance Share Awards | Percent vesting on second year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period   25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2013HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember		  
2013 Hybrid Performance Share Awards | Percent vesting on third year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period   50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2013HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember		  
2014 Hybrid Performance Share Awards | Percent vesting on first year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2014HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember		    
2014 Hybrid Performance Share Awards | Percent vesting on second year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2014HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember		    
2014 Hybrid Performance Share Awards | Percent vesting on third year anniversary      
Stock-Based Compensation arrangements      
Percent vesting per anniversary period 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= cog_A2014HybridPerformanceShareAwardsMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember		    
Performance Share Awards      
Stock-Based Compensation arrangements      
Number of types of performance awards granted to employees 3cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		    
Performance period 3 years    
Performance Share Awards | Low end of range      
Stock-Based Compensation arrangements      
Annual forfeiture rate assumption (as a percent) 0.00%cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Performance Share Awards | High end of range      
Stock-Based Compensation arrangements      
Annual forfeiture rate assumption (as a percent) 6.00%cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Performance shares based on performance conditions      
Stock-Based Compensation arrangements      
Number of types of performance awards granted to employees 2cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted
/ us-gaap_AwardTypeAxis
= cog_InternalMetricsPerformanceShareAwardsMember		    
Performance shares based on performance conditions | High end of range      
Stock-Based Compensation arrangements      
Right to receive shares (as a percent) 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares
/ us-gaap_AwardTypeAxis
= cog_InternalMetricsPerformanceShareAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Employee Performance Share Awards      
Stock-Based Compensation arrangements      
Performance period 3 years    
Vesting rights An employee will earn one-third of the award for each of the three performance metrics that the Company meets    
Summary of employee performance share awards activity (in shares)      
Outstanding at beginning of period 1,657,980us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 1,919,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 2,627,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Granted 241,130us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 379,540us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 567,360us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Issued and fully vested (751,780)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 (610,960)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 (1,189,920)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Forfeited (58,370)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 (30,240)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 (85,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Outstanding at end of period 1,088,960us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 1,657,980us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 1,919,640us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Weighted-Average Grant Date Fair Value per Share (in usd per share)      
Outstanding at beginning of period $ 16.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 12.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 8.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Granted $ 39.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 26.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 17.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Issued and fully vested $ 10.19cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 10.13cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 5.66cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Forfeited $ 23.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 17.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 12.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Outstanding at end of period $ 25.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 16.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember		 $ 12.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_EmployeePerformanceSharesMember
Hybrid Performance Share Awards      
Stock-Based Compensation arrangements      
Performance period 3 years    
Vesting rights The 2013 awards vest 25% on each of the first and second anniversary dates and 50% on the third anniversary and the 2012 and 2011 awards vest one-third on each anniversary date    
Minimum operating cash flow for the year preceding the performance period $ 100,000,000cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumOperatingCashFlowRequirement
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		    
Summary of employee performance share awards activity (in shares)      
Outstanding at beginning of period 450,212us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 592,162us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 759,328us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Granted 123,257us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 169,980us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 234,922us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Issued and fully vested (244,408)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 (311,930)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 (402,088)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Outstanding at end of period 329,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 450,212us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 592,162us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Weighted-Average Grant Date Fair Value per Share (in usd per share)      
Outstanding at beginning of period $ 18.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 13.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 9.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Granted $ 39.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 26.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 17.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Issued and fully vested $ 15.41cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 12.03cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 8.27cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Outstanding at end of period $ 29.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 18.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember		 $ 13.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_HybridPerformanceSharesMember
Performance shares based on market conditions      
Stock-Based Compensation arrangements      
Number of types of performance awards granted to employees 1cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfTypesOfEquityInstrumentsOtherThanOptionsGranted
/ us-gaap_AwardTypeAxis
= cog_MarketBasedPerformanceShareAwardsMember		    
Performance shares based on market conditions | High end of range      
Stock-Based Compensation arrangements      
Right to receive shares (as a percent) 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares
/ us-gaap_AwardTypeAxis
= cog_MarketBasedPerformanceShareAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Right to receive additional shares (as a percent) 100.00%cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveAdditionalShares
/ us-gaap_AwardTypeAxis
= cog_MarketBasedPerformanceShareAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
TSR Performance Share Awards      
Stock-Based Compensation arrangements      
Performance period 3 years    
Summary of employee performance share awards activity (in shares)      
Outstanding at beginning of period 860,686us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 605,706us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 1,495,904us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
Granted 184,885us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 254,980us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 234,922us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
Issued and fully vested (370,784)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 0cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 (1,125,120)cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriod
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
Outstanding at end of period 674,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 860,686us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 605,706us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
Weighted-Average Grant Date Fair Value per Share (in usd per share)      
Outstanding at beginning of period $ 14.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 10.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 6.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1]
Granted $ 32.04us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 23.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 14.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1]
Issued and fully vested $ 7.81cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 0.00cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 5.49cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedAndFullyVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1]
Outstanding at end of period $ 22.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 14.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1] $ 10.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 [1]
General information on stock-based compensation      
Cash payment 7,000,000cog_DeferredCompensationShareBasedArrangementsCashPayments
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 0cog_DeferredCompensationShareBasedArrangementsCashPayments
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember		 18,400,000cog_DeferredCompensationShareBasedArrangementsCashPayments
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
TSR Performance Share Awards | Equity Component      
Assumptions      
Fair value per performance share award granted during the period (usd per share) $ 32.04cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 $ 23.06cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 $ 14.16cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember
Stock price volatility 41.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 43.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 46.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember
Risk free rate of return 0.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember
Expected dividend yield (as a percent) 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember		 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_ShareholdersEquityMember
TSR Performance Share Awards | Liability Component      
General information on stock-based compensation      
Non-current portion of the liability , included in Other Liabilities 4,000,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 7,800,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		  
Current portion of the liability, included in Other Liabilities $ 7,000,000us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 $ 14,300,000us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		  
Assumptions      
Expected dividend yield (as a percent) 0.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
Stock price volatility, minimum 29.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 30.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 41.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
Stock price volatility, maximum 29.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 35.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 45.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
Risk free rate of return, minimum 0.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
Risk free rate of return, maximum 0.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember		 0.30%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
TSR Performance Share Awards | Low end of range | Liability Component      
Assumptions      
Fair value per performance share award granted during the period (usd per share) $ 12.88cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 23.96cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 19.11cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
TSR Performance Share Awards | High end of range | Liability Component      
Assumptions      
Fair value per performance share award granted during the period (usd per share) $ 29.72cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 38.61cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 $ 24.76cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedFairValue
/ us-gaap_AwardTypeAxis
= cog_TSRPerformanceSharesMember
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_LiabilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
[1] The grant date fair value figures in this table represent the fair value of the equity component of the performance share awards.