| **Basis of Presentation - Balance Sheet Information (Details) - USD ($) $ in Millions** | 3 Months Ended |        |         |
|-----------------------------------------------------------------------------------------|----------------|--------|---------|
||
| **Accounts Receivable, Net**                                                            |           |   |    |   |
| Commodity Sales                                                                         | $ 413          |   | $ 455   |   |
| Joint Interest Billings                                                                 | 234            |   | 207     |   |
| Other                                                                                   | 77             |   | 103     |   |
| Allowance for Doubtful Accounts                                                         | (17)           |   | (17)    |   |
| Total                                                                                   | 707            |   | 748     |   |
| **Other Current Assets**                                                                |           |   |    |   |
| Inventories, Materials and Supplies                                                     | 43             |   | 66      |   |
| Inventories, Crude Oil                                                                  | 17             |   | 16      |   |
| Assets Held for Sale                                                                    | 751            |   | 629     |   |
| Restricted Cash                                                                         | 30             | $ 0    | 38      | $ 30 |
| Prepaid Expenses and Other Current Assets (3)                                           | 54             |   | 31      |   |
| Total                                                                                   | 895            |   | 780     |   |
| **Other Noncurrent Assets**                                                             |           |   |    |   |
| Equity Method Investments                                                               | 378            |   | 305     |   |
| Customer-Related Intangible Assets                                                      | 334            |   | 0       |   |
| Investment in Tamar Petroleum Ltd                                                       | 162            |   | 0       |   |
| Mutual Fund Investments                                                                 | 56             |   | 57      |   |
| Net Deferred Income Tax Asset                                                           | 25             |   | 25      |   |
| Other Assets, Noncurrent                                                                | 66             |   | 74      |   |
| Total                                                                                   | 1,021          |   | 461     |   |
| **Other Current Liabilities**                                                           |           |   |    |   |
| Production and Ad Valorem Taxes                                                         | 93             |   | 84      |   |
| Commodity Derivative Liabilities                                                        | 112            |   | 58      |   |
| Income Taxes Payable                                                                    | 32             |   | 18      |   |
| Asset Retirement Obligations                                                            | 51             |   | 51      |   |
| Interest Payable                                                                        | 94             |   | 67      |   |
| Current Portion of Capital Lease Obligations                                            | 54             |   | 61      |   |
| Liabilities Associated with Assets Held for Sale                                        | 231            |   | 55      |   |
| Other Liabilities, Current                                                              | 124            |   | 184     |   |
| Total                                                                                   | 791            |   | 578     |   |
| **Other Noncurrent Liabilities**                                                        |           |   |    |   |
| Deferred Compensation Liabilities                                                       | 180            |   | 197     |   |
| Asset Retirement Obligations                                                            | 577            |   | 824     |   |
| Marcellus Shale Firm Transportation Commitment                                          | 73             |   | 76      |   |
| Production and Ad Valorem Taxes                                                         | 86             |   | 69      |   |
| Other Liabilities, Noncurrent                                                           | 97             |   | 79      |   |
| Total                                                                                   | 1,013          |   | $ 1,245 |   |
| Tamar and Dalit Fields                                                                  |           |   |    |   |
| **Other Current Assets**                                                                |           |   |    |   |
| Prepaid Expenses and Other Current Assets (3)                                           | 14             |   |    |   |
| **Other Noncurrent Liabilities**                                                        |           |   |    |   |
| Ownership Interest, Percentage                                                          |           |   | 7.50%   |   |
| Other Current Liabilities                                                               |           |   |    |   |
| **Other Noncurrent Liabilities**                                                        |           |   |    |   |
| Firm transportation liability                                                           | 11             | $ 14   |    |   |
| CNX Midstream Partners                                                                  |           |   |    |   |
| **Other Noncurrent Assets**                                                             |           |   |    |   |
| Equity Method Investments                                                               | $ 72           |   |    |   |

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Amounts 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.
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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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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. 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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Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.
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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.
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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.
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Current 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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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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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.
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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.
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The amount of identifiable intangible assets recognized as of the acquisition date.
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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.
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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).
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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.
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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.
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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
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| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.
+ References
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| - Definition
Amount classified as liabilities attributable to disposal group held for sale or disposed of.
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| - Definition
Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells.  For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.
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| - Definition
Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.
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| - Definition
Amount of current assets classified as other.
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| - Definition
Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.
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| - Definition
Amount of noncurrent assets classified as other.
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| - Definition
Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.
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| - Definition
Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.
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| - Definition
Amount due from parties in nontrade transactions, classified as other.
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| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.
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