Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and Cash Equivalents	$ 176,989	$ 327,420
Accounts and Notes Receivable:
Trade	259,817us-gaap_AccountsReceivableNetCurrent	332,574us-gaap_AccountsReceivableNetCurrent
Notes, Loans and Financing Receivable, Net, Current	0	25,861
Other Receivables, Net, Current	347,146us-gaap_OtherReceivablesNetCurrent	243,973us-gaap_OtherReceivablesNetCurrent
Inventories	101,873us-gaap_InventoryNet	157,914us-gaap_InventoryNet
Deferred Income Taxes	66,569us-gaap_DeferredTaxAssetsNetCurrent	211,303us-gaap_DeferredTaxAssetsNetCurrent
Income Taxes Receivable, Current	20,401us-gaap_IncomeTaxesReceivable	10,705us-gaap_IncomeTaxesReceivable
Prepaid Expenses	193,555us-gaap_PrepaidExpenseCurrent	135,842us-gaap_PrepaidExpenseCurrent
Total Current Assets	1,166,350us-gaap_AssetsCurrent	1,445,592us-gaap_AssetsCurrent
Property, Plant and Equipment:
Property, Plant and Equipment, Gross	14,674,777us-gaap_PropertyPlantAndEquipmentGross	13,578,509us-gaap_PropertyPlantAndEquipmentGross
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	4,512,305	4,136,247
Total Property, Plant and Equipment-Net	10,162,472us-gaap_PropertyPlantAndEquipmentNet	9,442,262us-gaap_PropertyPlantAndEquipmentNet
Other Assets:
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	152,958	291,675
Notes, Loans and Financing Receivable, Net, Noncurrent	0	125
Other	277,750us-gaap_OtherAssetsNoncurrent	214,013us-gaap_OtherAssetsNoncurrent
Total Other Assets	430,708us-gaap_OtherAssets	505,813us-gaap_OtherAssets
Total Assets	11,759,530us-gaap_Assets	11,393,667us-gaap_Assets
Current Liabilities:
Accounts Payable	531,973us-gaap_AccountsPayableCurrent	514,580us-gaap_AccountsPayableCurrent
Long-term Debt and Capital Lease Obligations, Current	13,016	11,455
Other Accrued Liabilities, Current	100,284us-gaap_OtherAccruedLiabilitiesCurrent	87,407us-gaap_OtherAccruedLiabilitiesCurrent
Other Accrued Liabilities	602,972	565,697
Liabilities of Disposal Group, Including Discontinued Operation, Current	0	28,239
Total Current Liabilities	1,147,961us-gaap_LiabilitiesCurrent	1,119,971us-gaap_LiabilitiesCurrent
Long-Term Debt:
Long-Term Debt	3,236,422us-gaap_LongTermDebtNoncurrent	3,115,963us-gaap_LongTermDebtNoncurrent
Capital Lease Obligations	39,456	47,596
Total Long-Term Debt	3,275,878	3,163,559
Deferred Credits and Other Liabilities
Deferred Tax Liabilities, Net, Noncurrent	325,592	242,643
Postretirement Benefits Other Than Pensions	703,680	961,127
Pneumoconiosis Benefits	116,941cnx_PneumoconiosisBenefits	111,971cnx_PneumoconiosisBenefits
Mine Closing	306,789cnx_MineClosingLiabilityNoncurrent	320,723cnx_MineClosingLiabilityNoncurrent
Gas Well Closing	175,369	175,603
Workers' Compensation	75,947	71,468
Salary Retirement	109,956	48,252
Reclamation	33,788cnx_MineReclamationLiabilityNoncurrent	40,706cnx_MineReclamationLiabilityNoncurrent
Other	158,171us-gaap_OtherLiabilitiesNoncurrent	131,355us-gaap_OtherLiabilitiesNoncurrent
Total Deferred Credits and Other Liabilities	2,006,233	2,103,848
TOTAL LIABILITIES	6,430,072us-gaap_Liabilities	6,387,378us-gaap_Liabilities
Stockholders' Equity:
Common Stock, $.01 Par Value; 500,000,000 Shares Authorized, 230,265,463 Issued and Outstanding at December 31, 2014; 229,145,736 Issued and Outstanding at December 31, 2013	2,306us-gaap_CommonStockValue	2,294us-gaap_CommonStockValue
Capital in Excess of Par Value	2,424,102us-gaap_AdditionalPaidInCapital	2,364,592us-gaap_AdditionalPaidInCapital
Preferred Stock, 15,000,000 shares authorized, None issued and outstanding	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Retained Earnings	3,054,150	2,964,520
Accumulated Other Comprehensive Loss	(151,100)	(325,117)
Common Stock in Treasury, at Cost- No Shares at December 31, 2014 and 2013	0us-gaap_TreasuryStockValue	0us-gaap_TreasuryStockValue
Total CONSOL Energy Inc. Stockholders' Equity	5,329,458us-gaap_StockholdersEquity	5,006,289us-gaap_StockholdersEquity
TOTAL EQUITY	5,329,458	5,006,289
TOTAL LIABILITIES AND EQUITY	$ 11,759,530	$ 11,393,667

Amount of a mine closing liability that is associated with a legal obligation for the closure of a mine.

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Amount of a reclamation liability that is associated with a legal obligation for the reclamation of a mine.

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This represents the noncurrent portion of the liability for benefits payable to workers affected by coal workers' pneumoconiosis ("black lung").

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Total deferred credits and other liabilities.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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