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Equity Method Investments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Constitution Pipeline Company, LLC |  |
Equity Method Investment |  |
Contributions made to equity method investments | $ 3.0 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_ConstitutionPipelineCompanyLLCMember | $ 5.8 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_ConstitutionPipelineCompanyLLCMember
Meade Pipeline Co LLC |  |
Equity Method Investment |  |
Contributions made to equity method investments | $ 2.1 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember | $ 0.2 cog_JointlyOwnedPipelineNetOwnershipContributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = cog_MeadePipelineCoLLCMember

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- Definition Represents the contributions to fund the cost associated with the project for the period. + References No definition available. + Details
Name: | cog_JointlyOwnedPipelineNetOwnershipContributions
Namespace Prefix: | cog_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cog_ConstitutionPipelineCompanyLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=cog_MeadePipelineCoLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |