Downward revision for acreage consolidation (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Acreage Consolidation Initiatives Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Acreage Consolidation Initiatives Less: Accumulated Amortization - Customer Relationships Finite-Lived Intangible Assets, Accumulated Amortization Commodity Derivatives Natural Gas Commodity Swaps Commodity Contract [Member] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] 3 - 5 years Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Award Timing Predetermined Award Timing Predetermined [Flag] Other Revenue and Operating Income Other Revenue And Operating Income Other Revenue And Operating Income Entity File Number Entity File Number Capital in Excess of Par Value Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Natural Gas, NGLs and Oil Revenue Oil and Gas, Result of Operation, Revenue, Unaffiliated Entity Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Non-Operated Producing Oil and Gas Assets Non-Operated Producing Oil and Gas Assets [Member] Non-Operated Producing Oil and Gas Assets Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Schedule of Fair Value, Assets and Liabilities Measured on Nonrecurring Basis Fair Value, by Balance Sheet Grouping [Table Text Block] Right-of-Use Assets Obtained in Exchange for Lease Obligations: Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract] Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract] Total Commitments Guarantor Obligations, Maximum Exposure, Undiscounted Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount Position [Axis] Position [Axis] Measurement Basis [Axis] Measurement Basis [Axis] Other Operating 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Compensation, Amount Adjustment to Compensation Amount Percentage of revenue (more than) Concentration Risk, Percentage Underwriter discount and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Changes in Other Assets Increase (Decrease) in Other Operating Assets Basis of Consolidation Consolidation, Policy [Policy Text Block] Stock-Based Compensation Share-Based Payment Arrangement, Noncash Expense Anti-Dilutive Options Options Stock Option Share-Based Payment Arrangement, Option [Member] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Grantee Status [Domain] Grantee Status [Domain] Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] TOTAL STOCKHOLDERS' EQUITY Beginning balance Ending balance Equity, Attributable to Parent Other Comprehensive Income (Loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Schedule of Property, Plant and Equipment, Useful Lives Schedule of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Surety Bonds: Surety Bond [Member] Additional cash consideration Debt Instrument, Convertible, Cash Consideration For Conversion Debt Instrument, Convertible, Cash Consideration For Conversion Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Prior Service Cost Credit Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Prior Service Cost Credit Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Prior Service Cost Credit Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum [Member] Exercisable (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Useful life, customer relationship intangible assets Finite-Lived Intangible Asset, Useful Life Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Accrued liability relating to uncertain tax positions Unrecognized Tax Benefits, Interest on Income Taxes Accrued Total Other Intangible Assets, net Finite-Lived Intangible Assets, Net Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS Concentration Risk Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Net Changes in Sales Prices and Production Costs Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Sale and Transfer Prices and Production Cost, Increase (Decrease) Derivative notional amount (in Bcf) Derivative, Nonmonetary Notional Amount, Volume Entity Shell Company Entity Shell Company Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Gas Gathering Equipment Gas Gathering Systems Net Gas Gathering Systems, Net Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Prior Service Cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] STOCK REPURCHASE Treasury Stock [Text Block] Income (Loss) Before Income Tax Income (Loss) Before Income Tax Income (Loss) from Continuing Operations before Income Taxes, Domestic Current Portion of Operating Lease Obligations (Note 13) Current Portion of Operating Lease Obligations Operating Lease, Liability, Current Interest on Lease Liabilities Finance Lease, Interest Expense Purchased Software Software and Software Development Costs [Member] Document Fiscal Period Focus Document Fiscal Period Focus Rate of Compensation Increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Other Significant Noncash Transactions by Unique Description [Axis] Other Significant Noncash Transaction [Axis] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Award Type [Axis] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Changes in Valuation Allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Realized Gain (Loss) on Commodity Derivative Instruments Realized Gain (Loss) On Hedging Activity Realized Gain (Loss) On Hedging Activity Issuance Related to Stock-Based Compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Other Accrued Liabilities and Other Liabilities Entity Address, City or Town Entity Address, City or Town Finance leases, weighted average discount rate Finance Lease, Weighted Average Discount Rate, Percent Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Net Deferred Tax Assets Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Anti-Dilutive Restricted Stock Units Restricted Stock Units Restricted Stock Units (RSUs) [Member] Development costs relating to capital Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs, Capital Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs, Capital Total Acreage Total Acreage - Net Total Acreage - Net One-Month LIBOR One-Month LIBOR [Member] One-Month LIBOR [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Cash Paid for Amounts Included in the Measurement of Lease Liabilities: Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Cash Paid For Amounts Included In Measurement Of Lease Liabilities [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Proved undeveloped resources (volume) Oil and Gas, Proved Undeveloped Reserve, Quantity, Volume 2028 Long-Term Debt, Maturity, Year Three Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Changes in Operating Assets: Increase (Decrease) in Operating Assets [Abstract] Finance leases, weighted average remaining lease term Finance Lease, Weighted Average Remaining Lease Term Options outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Net Payments on Revolving Credit Facility Borrowings Repayments of Lines of Credit Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Granted in 2020 Granted In 2020 [Member] Granted In 2020 Natural Gas, NGLs and Oil Revenue Oil and Gas [Member] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year One Less: Interest Finance Lease, Liability, Undiscounted Excess Amount Common stock, outstanding (in shares) Balance, beginning of year (in shares) Balance, end of year (in shares) Common Stock, Shares, Outstanding Gain on Asset Sales and Abandonments, net Gain (Loss) on Disposition of Other Assets Provision for Expected Credit Losses Accounts Receivable, Credit Loss Expense (Reversal) Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract] Production Costs Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Production Cost Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Percentage of aggregate commitments available under credit facility Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments Line Of Credit Facility, Availability Under Credit Facility, Percentage Of Aggregate Commitments Fair value of performance share units vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Proceeds from Issuance of CNX Senior Notes Proceeds from Issuance of Senior Long-Term Debt Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Schedule of Oil and Gas, Full Cost Method, Amortization Expense Oil and Gas, Full Cost Method, Amortization Expense [Table Text Block] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Change in Benefit Obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Murray Murray Energy Corporation [Member] Murray Energy Corporation Income Tax Expense (Benefit) Effective Tax Rate Income Tax Expense (Benefit) Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Future Net Cash Flows Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Net Cash Flow, before Discount Document Information [Line Items] Document Information [Line Items] Royalty Interest Royalty Interest [Member] Royalty Interest Preferred stock, issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] CNXM Revolving Credit Facility CNXM Revolving Credit Facility [Member] CNXM Revolving Credit Facility Property, Plant and Equipment Total Property, Plant and Equipment Property, Plant and Equipment, Gross Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers [Member] Convertible 2.25% Senior Notes Due 2026, Additional Option To Initial Purchasers Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Schedule of Changes in Accumulated Postemployment Benefit Obligations Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] Discretionary contributions to the plan, amount Defined Contribution Plan, Employer Discretionary Contribution Amount Schedule of Oil and Gas, Proved Reserve, Quantity Oil and Gas, Proved Reserve, Quantity [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Cash received from option exercises Proceeds from Stock Options Exercised Apex Acquisition (Net of Cash Acquired) Consideration Payments to Acquire Businesses, Net of Cash Acquired U.S. Federal Income Tax Paid, Federal, after Refund Received Buildings and Improvements Building and Building Improvements [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Net Operating Loss- Federal Federal net operating losses Deferred Tax Assets, Operating Loss Carryforwards, Domestic Contingencies Commitments and Contingencies, Policy [Policy Text Block] Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Deferred Tax Liabilities: Deferred Tax Liabilities, Gross [Abstract] Beginning nonvested balance (in shares) Ending nonvested balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Accumulated Benefit Obligation Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net Cash Provided by Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Useful life of property, plant and equipment Property, Plant and Equipment, Useful Life Subsequent Event Subsequent Event [Member] Schedule of Share-based Payment Award, Options Granted, Assumptions and Weighted Average Fair Value Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Type of Reserve [Domain] Type of Reserve [Domain] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Purchase Commitment, Excluding Long-term Commitment [Axis] Purchase Commitment, Excluding Long-Term Commitment [Axis] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] 2029 Finance Lease, Liability, to be Paid, Year Four Other Gas Assets Capitalized Costs, Other Gas Assets Capitalized Costs, Other Gas Assets Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Convertible Notes Convertible Debt [Member] Letters of Credit: Standby Letters of Credit [Member] Environmental Attributes Environmental Attributes [Member] Environmental Attributes State Deferred Tax Adjustment Deferred Tax Assets, State Taxes Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Trade Receivables Trade Accounts Receivable [Member] Costs and Expenses: Operating Costs and Expenses [Abstract] Number of reportable segments Number of Reportable Segments Net Change Due to Extensions, Discoveries and Improved Recovery Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Extension, Discovery, and Improved Recovery Loss contingency, period payable Loss Contingency, Period Payable Loss Contingency, Period Payable Gas Wholesalers Gas Customers [Member] Gas Customers [Member] Pre-tax discounted basis, plugging and abandonment costs Development Costs, Plugging And Abandonment Costs, Present Value On Discounted Basis Development Costs, Plugging And Abandonment Costs, Present Value On Discounted Basis Entity Address, State or Province Entity Address, State or Province Financing Cash Flows for Finance Leases Finance Lease, Principal Payments Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] 2029 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total Current Liabilities Liabilities, Current Individual: Individual [Axis] Total payment and cost to the plan Defined Contribution Plan, Cost Audit Information [Abstract] Audit Information [Abstract] Finance Leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Document Annual Report Document Annual Report Downward revision due to plan changes (energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes (Energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes (Energy) Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Purchase and retirement of long term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Schedule of Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Table Text Block] Development Oil and Gas, Cost Incurred, Development Cost Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Interest Credited Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Other Significant Noncash Transaction, Name [Domain] Other Significant Noncash Transaction, Name [Domain] Aggregate intrinsic value, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Schedule of Long-term Purchase Commitment Long-Term Purchase Commitment [Table Text Block] Cash Received in Settlement of Interest Rate Swaps Gain (Loss) on Sale of Derivatives Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Net Operating Loss - State Deferred Tax Assets, Operating Loss Carryforwards Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Working Interest Working Interest [Member] Working Interest 2027 Finance Lease, Liability, to be Paid, Year Two Net leverage ratio Debt Instrument, Net Leverage Ratio Debt Instrument, Net Leverage Ratio Less—Accumulated Depreciation, Depletion and Amortization Finance Lease, Right-of-Use Asset, Accumulated Amortization Balance at beginning of period Balance at end of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Total Other Non-Current Assets Other Assets, Noncurrent Customer [Domain] Customer [Domain] Accrued Interest Interest Payable, Current Entity Central Index Key Entity Central Index Key PEO Name PEO Name Balance, Beginning of Year Balance, End of Year Asset Retirement Obligation Conversion price (in usd per share) Debt Instrument, Convertible, Conversion Price Schedule of Maturities of Long-Term Debt Schedule of Maturities of Long-Term Debt [Table Text Block] Total Revenue and Other Operating Income Total Consolidated Revenue and Other Operating Income Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Schedule of Assets Amortized by Units of Production [Table] [Table] Schedule of Assets Amortized by Units of Production [Table] [Table] Schedule of Assets Amortized by Units of Production [Table] [Table] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Deferred Revenue Contract with Customer, Liability, Current Debt instrument, unamortized premium Debt Instrument, Unamortized Premium, Current Schedule of Derivative Instruments in Statement of Financial Position, Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Benefits and Other Payments Defined Benefit Plan, Benefit Obligation, Benefits Paid Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] U.S. Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Long Long [Member] Unproved Gas Properties Oil and Gas, Successful Efforts Method, Property and Equipment, Unproved Property, before Accumulated Depreciation, Depletion, Amortization, and Impairment Long-Term Debt (Note 12) Long-Term Debt Long-Term Debt, Excluding Current Maturities Net development wells drilled Development Wells Drilled, Net Productive1 Development Wells Drilled, Net Productive1 Oil and Gas, Proved Reserve, Quantity, Volume [Roll Forward] Oil and Gas, Proved Reserve, Quantity, Volume [Roll Forward] Estimated annual amortization expense, year 3 Finite-Lived Intangible Asset, Expected Amortization, Year Three Deferred Tax Assets: Deferred Tax Assets, Net [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Capped Call Transaction Capped Call Transaction [Member] Capped Call Transaction Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss, Current Revision for fallen wells Proved Developed and Undeveloped Reserve, Performance Revision, Price And Economy Proved Developed and Undeveloped Reserve, Performance Revision, Price And Economy Producing Wells, Interest [Domain] Producing Wells, Interest [Domain] Producing Wells, Interest Issuance related to Convertible Debt (in shares) Issuance related to convertible debt (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Roll Forward] Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Roll Forward] Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] Amortization of Prior Service Cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Income Tax Expense Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Income Tax Expense Schedule of Shares of Common Stock Outstanding Schedule of Stock by Class [Table Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Timing and Other Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Timing and Other Standardized Measure of Discounted Future Net Cash Flow of Proved Oil and Gas Reserves, Timing and Other Pre-tax Operating Income Oil and Gas, Result of Operation, before Income Tax Expense (Benefit) Changes in Unrecognized Tax Benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Schedule of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Obligations Settled Asset Retirement Obligation, Cash Paid to Settle Purchased Gas Costs Production Royalty Interests and Purchased Gas Costs Production Royalty Interests and Purchased Gas Costs Effect of Diluted Shares (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title and Position [Domain] Title and Position [Domain] Total Costs and Expenses Costs and Expenses Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unrecognized compensation cost related to nonvested awards Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Royalties Accrued Royalties Fair Value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted average remaining contractual term (in years), outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Minimum current ratio Minimum Current Ratio Per Credit Facility Minimum Current Ratio Per Credit Facility Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount 2028 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Non-PEO NEO Non-PEO NEO [Member] Aggregate intrinsic value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Position [Domain] Position [Domain] Asset Retirement Obligations Asset Retirement Obligation, Current Exploration Costs Oil and Gas, Result of Operation, Expense, Other Operating Lease Right-of-Use Assets Deferred Tax Liabilities, Leasing Arrangements Finance Leases: Lessee, Finance Lease, Description [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Gain (Loss) on Commodity Derivative Instruments (Gain) Loss on Commodity Derivative Instruments Gain (Loss) on Commodity Derivative Instruments Gain (Loss) on Commodity Derivative Instruments Gain (Loss) on Hedging Activity Award Type [Domain] Award Type [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Senior Notes due April 2030 Senior Notes Due April 2030 [Member] Senior Notes Due April 2030 Equity Awards Adjustments Equity Awards Adjustments [Member] Other Other Noncash Income (Expense) Total Non-Current Liabilities Deferred Credits and Other Liabilities Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Effect of Changes in Tax Laws or Rates Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent Other Operating Income Other Income Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount More than 5 years Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Interest coverage ratio Debt Instrument, Interest Coverage Ratio Debt Instrument, Interest Coverage Ratio Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Expected dividend yield (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Reporting Unit [Domain] Reporting Unit [Domain] Charged to expense - additions SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Schedule of Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Environmental Environment Related Commitments [Member] Environment Related Commitments Schedule of Gas and Oil Acreage Oil and Gas, Acreage [Table Text Block] Proved and unproved resources, extensions and discoveries (energy) Proved Developed and Undeveloped Reserve, Extensions And Discoveries Proved Developed and Undeveloped Reserve, Extensions And Discoveries Equity Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Proved Undeveloped Acreage Oil and Gas, Undeveloped Acreage, Gross Total Revenue Oil and Gas, Result of Operation, Revenue Purchase Commitment Purchase Commitment [Member] Revenue and Other Operating Income: Revenues [Abstract] Working interest percentage Proved Developed And Undeveloped Reserves, Working Interest Percentage Proved Developed And Undeveloped Reserves, Working Interest Percentage Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Employee-Related Employee Related Commitments [Member] Employee Related Commitments Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Gross Amortizable Asset - Customer Relationships Finite-Lived Customer Relationships, Gross Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss), Net of Tax 2026 Long-Term Debt, Maturity, Year One Total Deferred Tax Liabilities Deferred Tax Liabilities, Gross Award Date [Domain] Award Date [Domain] 2030 Long-Term Debt, Maturity, Year Five Total Standardized Measure of Discounted Net Cash Flows Balance at Beginning of Period Total Discounted Cash Flow at End of Period Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Net Cash Flow, after Discount Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Debt instrument, price, percentage of par Debt Instrument, Price, Percentage Of Par Debt Instrument, Price, Percentage Of Par Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Supplies Inventories Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Minimum Minimum [Member] Amortization of Deferred Financing Costs Amortization of Other Deferred Charges Revenues Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Future Cash Inflow Revisions Due to 5 Year Rule Revisions Due to Five Year Rule [Member] Revisions Due to Five Year Rule [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Oil and Gas, Productive Well [Table] Oil and Gas, Productive Well [Table] Price Changes (volume) Proved Developed and Undeveloped Reserves, Price Changes Proved Developed and Undeveloped Reserves, Price Changes Fair Value Measurement [Domain] Fair Value Measurement [Domain] ASSET RETIREMENT OBLIGATIONS Asset Retirement Obligation Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Purchase Commitment, Excluding Long-term Commitment [Domain] Purchase Commitment, Excluding Long-Term 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Marketing LLC Citadel Energy Marketing LLC [Member] Citadel Energy Marketing LLC Schedule of Assumptions Used Defined Benefit Plan, Assumptions [Table Text Block] Other Other gas assets Other Gas Assets Pennsylvania Income Tax Paid, State and Local, after Refund Received Consolidation Items [Domain] Consolidation Items [Domain] Convertible Senior Notes due 2026 Convertible 2.25% Senior Notes due May 2026 [Member] Convertible 2.25% Senior Notes due May 2026 Oil and Gas, Average Sale Price and Production Cost Per Unit [Table] Oil and Gas, Average Sale Price and Production Cost Per Unit [Table] Auditor Location Auditor Location Prepaid Expenses Increase (Decrease) in Prepaid Expense Current Portion of Long-Term Liabilities: Liabilities, Other than Long-Term Debt, Noncurrent [Abstract] Proved Gas Properties Oil and Gas, Successful Efforts Method, Property and Equipment, Proved Property, before Accumulated Depreciation, Depletion, Amortization, and Impairment Purchase and Retirement of 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Marketing LLC Direct Energy Business Marketing LLC [Member] Direct Energy Business Marketing LLC Share Repurchase Program [Line Items] Share Repurchase Program [Line Items] Price changes (energy) Proved Developed and Undeveloped Reserves, Price Changes (Energy) Proved Developed and Undeveloped Reserves, Price Changes (Energy) Amortization of Right-of-Use Assets Finance Lease, Right-of-Use Asset, Amortization Net Wells And Acreage, Net [Abstract] Wells And Acreage, Net [Abstract] Other Other Liabilities, Noncurrent Accrued Other Taxes Accrual for Taxes Other than Income Taxes, Current Proved developed resources (volume) Oil and Gas, Proved Developed Reserve, Quantity, Volume Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Convertible 7.25% Senior Notes Due 2032 Convertible 7.25% Senior Notes Due 2032 [Member] Convertible 7.25% Senior Notes Due 2032 Loss on Other Derivative Instruments Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current Portion of Long-Term Debt (Note 12) Less: Current Portion Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Company Contributions Defined Benefit Plan, Plan Assets, Contributions by Employer 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Central Pennsylvania and Southwest Pennsylvania Central Pennsylvania And Southwest Pennsylvania [Member] Central Pennsylvania And Southwest Pennsylvania Accrued Payroll & Benefits Accrued Bonuses, Current Debt issuance costs gross Debt Issuance Costs, Gross Comprehensive Income (Loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Disposal Group Name [Domain] Disposal Group Name [Domain] Name Measure Name Payments to acquire interests Payments to Acquire Royalty Interests in Mining Properties CNXM CNXM [Member] CNXM [Member] Payment terms for contract with customers Contracts With Customers, Payment Terms Contracts With Customers, Payment Terms Deferred Income Taxes (Note 6) Deferred Income Tax Liabilities, Net Purchases of Reserves In-Place (energy) Oil and Gas, Proved Reserve, Quantity, Energy, Purchase of Mineral in Place SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Foreign Tax Credits Effective Income Tax Rate Reconciliation, Tax Credit (Expiration), Foreign, Percent Effective Income Tax Rate Reconciliation, Tax Credit (Expiration), Foreign, Percent Number of dry gas wells added Unproductive Properties, Number Of Wells Unproductive Properties, Number Of Wells Net Carrying Amount Long-Term Debt (Excluding Debt Issuance Costs) Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] TOTAL ASSETS Segment Assets Assets Interest Limitation Deferred Tax Assets, Interest Limitation Deferred Tax Assets, Interest Limitation Schedule of Nonvested Restricted Stock Units 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Interest (Net of Amounts Capitalized) Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Operating Lease Right-of-Use Assets (Note 13) Operating Lease Right-of-Use Assets Operating Lease, Right-of-Use Asset Effective Tax Rate Effective Income Tax Rate Reconciliation, Percent Natural Gas, NGLs and Oil Revenue Total Natural Gas, NGL and Oil Revenue Oil and Gas Service [Member] Operating Lease Cost Operating Lease, Cost Decrease in unrecognized tax benefits resulting from tax position taken on prioryear return Reductions for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Proved developed resources (energy) Oil and Gas, Proved Developed Reserve, Quantity, Energy Carrying Amount Reported Value Measurement [Member] Net Cash (Paid) Received in Settlement of Commodity Derivative Instruments Increase (Decrease) Cash Collateral from Counterparties Recognition period, weighted average Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Valuation Allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Period from reserves booking for proved undeveloped locations to be fully developed Proved Undeveloped Reserves, Period To Be Fully Developed Proved Undeveloped Reserves, Period To Be Fully Developed Impairment of Goodwill and Definite-Lived Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Area of land sold (in acres) Disposition Of Area Of Land Disposition Of Area Of Land Derivative Instruments Derivatives, Policy [Policy Text Block] SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] 1 - 3 years Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value of Plan Assets at Beginning of Period Fair Value of Plan Assets at End of Period Defined Benefit Plan, Plan Assets, Amount U.S. Federal Current Federal Tax Expense (Benefit) Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization expense Amortization of Intangible Assets Purchased Gas Payable Gas Purchase Payable, Current Restricted Cash Restricted cash Restricted Cash and Cash 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For acquisitions, description of a business acquisition (or series of individually immaterial business combinations) planned, initiated, or completed during the period, including background, timing, and allocation of acquisition costs. For dispositions, disclosure includes the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain or loss recognized in the income statement and the income statement caption that includes that gain or loss, and the segment in which the disposal group was reported. 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Notes Due March 2027 [Member] Gas Properties Oil and Gas Properties [Member] Property, Plant and Equipment (Note 8): Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Net Periodic Benefit Cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Total Acreage Total Acreage - Gross Total acreage Charged to expense - deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment Producing Gas Wells Gas, Productive Well, Number of Wells, Gross Energy [Axis] Energy [Axis] Property, Plant and Equipment Finance Lease, Right-of-Use Asset, before Accumulated Amortization Oil and Gas, 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Arrangement, Individual Name NRG Business NRG Business [Member] NRG Business Schedule of Short-term Debt [Table] Short-Term Debt [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Exploration Oil and Gas, Cost Incurred, Exploration Cost Principal Debt Instrument, Face Amount Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Deferred Tax Asset, Valuation Allowance [Table] Deferred Tax Asset, Valuation Allowance [Table] Marcellus Shale Rights Marcellus Shale Rights [Member] Marcellus Shale Rights Changes in Estimated Future Development Costs Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Estimated Future Development Cost, Increase (Decrease) Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Name Awards Close in Time to MNPI Disclosures, Individual Name Total Other Accrued Liabilities Other Accrued Liabilities Energy [Domain] Energy [Domain] Beginning nonvested balance (in usd per share) Ending nonvested balance (in usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Short-term Debt, Other Disclosures [Abstract] Short-Term Debt, Other Disclosure [Abstract] Schedule of Oil and Gas, Capitalized Cost Oil and Gas, Capitalized Cost [Table Text Block] Plan changes in decrease Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes in Decrease Proved Developed and Undeveloped Reserve, Revision of Previous Estimate For Plan Changes in Decrease Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Convertible 2.25% Senior Notes Due 2026 Convertible 2.25% Senior Notes Due 2026 [Member] Convertible 2.25% Senior Notes Due 2026 ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Exploratory wells, drilled uncompleted Exploratory Wells, Drilled Uncompleted Exploratory Wells, Drilled Uncompleted Company's matching contribution, percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Convertible Debt Exchange for Shares Stock Issued During Period, Value, Conversion of Convertible Securities Apex Transaction Apex Transaction [Member] Apex Transaction Schedule of Maturity of Lease Liability, Financing Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan Disclosure [Line Items] Litigation Case [Axis] Litigation Case [Axis] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] Deferred tax asset related to state operating losses Deferred Tax Assets, Operating Loss Carryforwards, State and Local Borrowings and issuance of letters of credit remaining capacity Line of Credit Facility, Remaining Borrowing Capacity Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Benefit Obligation at Beginning of Period Benefit Obligation at End of Period Defined Benefit Plan, Benefit Obligation Apex Energy II, LLC Apex Energy II, LLC [Member] Apex Energy II, LLC Debt instrument, unamortized discount Debt Instrument, Unamortized Discount, Current Proved Developed Acreage Oil and Gas, Developed Acreage, Net Supplies Inventories Increase (Decrease) in Inventories Operating Lease Liabilities Deferred Tax Assets, Operating Lease Liability Deferred Tax Assets, Operating Lease Liability Common Stock Outstanding [Roll Forward] Common Stock Outstanding [Roll Forward] Common Stock Outstanding Less—Accumulated Depreciation, Depletion and Amortization Less: Accumulated Depreciation, Depletion and Amortization Accumulated Depreciation, Depletion and Amortization, Property, 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Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Defined Benefit Plan Net Periodic Benefit Cost Credit Amortization Of Gain Loss Statement Of Income Or Comprehensive Income Extensible List Not Disclosed Flag Concentration Risk [Line Items] Concentration Risk [Line Items] Short-term Debt [Line Items] Short-Term Debt [Line Items] Other comprehensive income, tax expense Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Schedule II - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Maximum net leverage ratio Interest Ratio Per Credit Facility Covenant Interest Ratio Per Credit Facility Covenant Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Gas delivery commitment, remaining contractual volume Oil and Gas, Delivery Commitment, Quantity Committed, Volume Schedule of Reconciliation of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Projected Benefit Obligation Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation Derivative Contract [Domain] Derivative Contract [Domain] Proceeds from Issuance of Common Stock Proceeds from Issuance of Common Stock Net Capitalized Costs Oil and Gas, Capitalized Cost, after Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Five CNX Revolving Credit Facility CNX Revolving Credit Facility [Member] CNX Revolving Credit Facility [Member] All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Capital Expenditures Capital Expenditures Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Unrealized Loss on Interest Rate Swaps Unrealized Gain (Loss) on Derivatives Expiration period Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Property Acquisitions Oil and Gas, Cost Incurred, Property Acquisition Cost [Abstract] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Initial Notes - Convertible 7.25% Senior Notes Due 2032 Initial Notes - Convertible 7.25% Senior Notes Due 2032 [Member] Initial Notes - Convertible 7.25% Senior Notes Due 2032 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For Purchase Of Capped Call Related To Convertible Debt Federal Funds Open Rate Federal Funds Open Rate [Member] Federal Funds Open Rate [Member] Geographical [Axis] Geographical [Axis] Less: Tax Benefit AOCI Tax, Attributable to Parent Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Gas Gathering Assets Oil and Gas, Capitalized Cost, before Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance, Support Equipment and Facility Actuarially Determined Long-Term Liability Adjustments (Net of tax: $(21), $(550), $258) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent Accretion Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Accretion of Discount SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying 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Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Table] Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Table] Oil and Gas, Development Well Drilled [Line Items] Oil and Gas, Development Well Drilled [Line Items] Interest Rate Swap on Revolving Credit Facility Interest Rate Swap On Revolving Credit Facility [Member] Interest Rate Swap On Revolving Credit Facility Liability Component: Debt Instrument Liability Component [Abstract] Debt Instrument Liability Component State Operating Losses Deferred Tax Asset, Valuation Allowance, State Operating Losses [Member] Deferred Tax Asset, Valuation Allowance, State Operating Losses [Member] Energy-related tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Energy-Related, Percent Thereafter Finance Lease, Liability, to be Paid, after Year Five Exercised (in usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price SUPPLEMENTAL GAS DATA (unaudited) Oil and Gas, Supplemental Disclosure [Text Block] Award Timing Disclosures [Line Items] Schedule of Change in Asset Retirement Obligation Schedule of Change in Asset Retirement Obligation [Table Text Block] Recoveries Collected Accounts Receivable, Allowance for Credit Loss, Recovery Lease renewal term (in years) Lessee, Operating Lease, Renewal Term Performance revision associated with proved developed producing assets (energy) Proved Developed and Undeveloped Reserve, Performance Revision Proved Developed and Undeveloped Reserve, Performance Revision U.S. State Deferred State and Local Income Tax Expense (Benefit) Net dry development wells drilled Development Wells Drilled, Net Nonproductive1 Development Wells Drilled, Net Nonproductive1 Net Income (Loss) Net Income (Loss) Net Income (Loss) Attributable to Parent Other Accrued Liabilities (Note 11) Other Accrued Liabilities, Current Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Release of valuation allowance - deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Purchases of Common Stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Contract asset Contract with Customer, Asset, after Allowance for Credit Loss Major Customers [Axis] Customer [Axis] Customer Relationships Customer Relationships [Member] Retained Earnings Retained Earnings (Accumulated Deficit) Revisions Due to Changes Related to Well Performance Plan and Other Revisions [Member] Plan and Other Revisions [Member] Transportation, Gathering and Compression Natural Gas, Gathering, Transportation, Marketing and Processing [Member] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Discounted to Present Value at a 10% Annual Rate Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow, Discount Income Tax Expense Oil and Gas, Result of Operation, Income Tax Expense (Benefit) Class of Stock [Axis] Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Oil and Gas, Proved Reserve, Quantity [Line Items] Oil and Gas, Proved Reserve, Quantity [Line Items] Other Deferred Tax Liabilities, Other Other Expense (Income) Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Number of net dry exploratory wells Oil and Gas, Exploratory Well Drilled, Net Nonproductive (Dry), Number Accumulated Depreciation, Depletion and Amortization Oil and Gas, Capitalized Cost, Accumulated Depreciation, Depletion, Amortization, and Valuation Allowance Deferred Income Taxes Deferred income tax (benefit) Deferred Income Tax Expense (Benefit) Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Variable Rate [Domain] Variable Rate [Domain] Finance Lease Obligations (Note 13) Finance Lease Obligations Finance Lease, Liability, Noncurrent Realized (Loss) Gain on Commodity Derivative Instruments: Gain (Loss) on Sale of Commodity Contracts All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Deferred tax benefit from stock-based compensation Share-Based Payment Arrangement, Expense, Tax Benefit Number of shares approved for increase in available for issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Revision due to mining and performance Proved Developed and Undeveloped Reserve, Revision of Previous Estimate for Mining and Performance (Energy) Proved Developed and Undeveloped Reserve, Revision of Previous Estimate for Mining and Performance (Energy) Average Effects of Commodity Derivative Financial Settlements (per Mcfe) Average effects of financial settlements (per thousand cubic feet) Average effects of financial settlements (per thousand cubic feet) Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Producing Oil Wells Oil, Productive Well, Number of Wells, Net Non-Current Liabilities: Long-Term Debt, Excluding Current Maturities [Abstract] Other Significant Noncash Transactions [Line Items] Other Significant Noncash Transactions [Line Items] Receivable [Domain] Receivable [Domain] Operating leases, weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Schedule of Share-based Compensation, Stock and Performance Options Rollforward Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average Shares of Common Stock Outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule of Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Convertible 2.25% Senior Notes Due 2026, Liability Component Convertible 2.25% Senior Notes Due 2026, Liability Component [Member] Convertible 2.25% Senior Notes Due 2026, Liability Component Schedule of Losses Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Director Director [Member] Share Repurchase Program [Table] Share Repurchase Program [Table] Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Segment Reporting [Abstract] Segment Reporting [Abstract] Lease Operating Expense Operating Lease, Expense Debt Disclosure [Abstract] Extractive Industries [Abstract] Extractive Industries [Abstract] Write-off of Uncollectible Accounts Accounts Receivable, Allowance for Credit Loss, Writeoff Interest related to income tax deficiencies Unrecognized Tax Benefits, Interest on Income Taxes Expense Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Less Than 1  Year Balance on First Anniversary [Member] Balance on First Anniversary [Member] 1-3 Years More Than One And Within Three Years From Balance Sheet Date [Member] More than One and within Three Years from Balance Sheet Date Year 2031-2035 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31) Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] Effect of Changes in Tax Laws or Rates Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount Use of Estimates Use of Estimates, Policy [Policy Text Block] Current Liabilities Liability, Defined Benefit Plan, Current Operating Cash Flows for Finance Leases Finance Lease, Interest Payment on Liability Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Salary Retirement Liability, Defined Benefit Pension Plan, Current Other Other Commitments [Member] Other Commitments Operating Leases Operating Leases, Future Minimum Payments Receivable [Abstract] Insider Trading Arrangements [Line Items] Midstream Midstream [Member] Midstream [Member] TOTAL LIABILITIES Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Current Portion Settlement - See Note 11 Settlement Liabilities, Current 2030 Finance Lease, Liability, to be Paid, Year Five Accounts and Notes Receivable: Accounts and Financing Receivable, after Allowance for Credit Loss, Current [Abstract] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Senior Notes due January 2029 Senior Notes due January 2029 [Member] Senior Notes due January 2029 Increase in unrecognized tax benefits resulting from tax positions taken during current period Additions based on tax positions related to the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Issuance of Common Stock Stock Issued During Period, Value, New Issues Consolidation Items [Axis] Consolidation Items [Axis] Unamortized Issuance Costs Unamortized Issuance Costs Unamortized Debt Issuance Expense Variable Rate [Axis] Variable Rate [Axis] Shale Shale [Member] Shale Threshold trading days Debt Instrument, Convertible, Threshold Trading Days Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net Obligation Recognized Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position PENNSYLVANIA