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Commitments and Contingent Liabilities - Narrative (Details)	May 01, 2020 employee
Murray | Settlement Agreement Between Murray And UMWA [Member]
Loss Contingencies [Line Items]
Number of retirees	2,159

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- Definition

Number Of Retired Employees

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No definition available.

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Name:	cnx_NumberOfRetiredEmployees
Namespace Prefix:	cnx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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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

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	dei_LegalEntityAxis=cnx_MurrayEnergyCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=cnx_SettlementAgreementBetweenMurrayAndUMWAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: