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v3.20.4

Fair Value Measurements - Narrative (Details) - Impaired_Asset_And_Liabilty | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |  |
Number of non-financial assets and liabilities impaired | 0 | 0 | 0

X
- Definition Represents the number of non-financial assets and liabilities that were impaired during the period. + References No definition available. + Details
Name: | cog_NumberOfNonFinancialAssetsAndLiabilitiesImpaired
Namespace Prefix: | cog_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration