XML 141 R117.htm IDEA: XBRL DOCUMENT
v3.20.4

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

X
- Definition Number Of Retired Employees + References No definition available. + Details
Name: | cnx_NumberOfRetiredEmployees
Namespace Prefix: | cnx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- Details
Name: | dei_LegalEntityAxis=cnx_MurrayEnergyCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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