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Employee Benefit Plans - Narrative (Details) | 1 Months Ended
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Sep. 30, 2017 employee
West Virginia, Virginia, and Ohio |
Defined Benefit Plan Disclosure [Line Items] |
Number of terminated employees | 100

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of positions eliminated during the period as a result of restructuring activities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementGeographicalAxis=cog_WestVirginiaVirginiaandOhioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |