| **Acquisitions and Dispositions (Details) (USD $)**                                              | 3 Months Ended  | 6 Months Ended | 9 Months Ended |                 |
|--------------------------------------------------------------------------------------------------|-----------------|----------------|----------------|-----------------|
||
| **Current Assets [Abstract]**                                                                    |            |                |           |            |  |   |   |   |
| Accounts Receivable, Net                                                                         | $ 19,000,000    |                |           | $ 19,000,000    |  |   |   |   |
| Other Current Assets                                                                             | 11,000,000      |                |           | 11,000,000      |  |   |   |   |
| Total Current Assets                                                                             | 30,000,000      |                |           | 30,000,000      |  |   |   |   |
| Property, Plant, and Equipment, Net                                                              | 294,000,000     |                |           | 294,000,000     |  |   |   |   |
| Total Assets Held for Sale                                                                       | 324,000,000     |                |           | 324,000,000     |  |   |   |   |
| **Current Liabilities [Abstract]**                                                               |            |                |           |            |  |   |   |   |
| Accounts Payable - Trade                                                                         | 9,000,000       |                |           | 9,000,000       |  |   |   |   |
| Asset Retirement Obligations                                                                     | 89,000,000      |                |           | 89,000,000      |  |   |   |   |
| Deferred Tax Liability                                                                           | 136,000,000     |                |           | 136,000,000     |  |   |   |   |
| Total Liabilities Associated with Assets Held for Sale                                           | 234,000,000     |                |           | 234,000,000     |  |   |   | 0 |
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**    |            |                |           |            |  |   |   |   |
| Oil and Gas Sales                                                                                | 65,000,000      |                | 112,000,000    | 140,000,000     |  | 225,000,000 |   |   |
| Income before income taxes                                                                       | 39,000,000      |                | 69,000,000     | 79,000,000      |  | 137,000,000 |   |   |
| Income tax expense                                                                               | 22,000,000      |                | 44,000,000     | 47,000,000      |  | 64,000,000 |   |   |
| Discontinued Operations, Net of Tax                                                              | 17,000,000      |                | 25,000,000     | 32,000,000      |  | 73,000,000 |   |   |
| **Marcellus Shale Joint Venture [Abstract]**                                                     |            |                |           |            |  |   |   |   |
| Equity Method Investment, Ownership Percentage                                                   |            |                |           |            |  |   | 50.00% |   |
| Undeveloped acres purchased                                                                      |            |                |           |            |  |   | 628,000 |   |
| Business Acquisition, Cost of Acquired Entity, Purchase Price                                    |            |                |           |            |  |   | 1,300,000,000 |   |
| Payments On Venture To Explore And Develop Oil And Gas Properties                                |            |                |           | 610,000,000     |  |   |   |   |
| Remaining annual installments to purchase joint venture partnership                              |            |                |           | 2               |  |   |   |   |
| Ratio of funding on share of future drilling and completion costs                                | one-third       |                |           | one-third       |  |   |   |   |
| Maximum amount to be paid each calendar year for funding of future drilling and completion costs |            |                |           | 400,000,000     |  |   |   |   |
| Funding of joint venture's future drilling and completion costs                                  |            |                |           | 2,100,000,000   |  |   |   |   |
| Period over which Carried Cost Obligation is expected to extend                                  |            |                |           | 8 years         |  |   |   |   |
| Natural gas price agreed upon benchmark, average (per MMBtu)                                     |            |                |           | 4.00            |  |   |   |   |
| Payable with imputed interest, discount                                                          | 17,000,000      |                |           | 17,000,000      |  |   |   |   |
| **North Sea Divestiture [Abstract]**                                                             |            |                |           |            |  |   |   |   |
| Interest in Dumbarton and Lochranza Fields                                                       | 30.00%          |                |           | 30.00%          |  |   |   |   |
| Expected Divestiture Proceeds                                                                    | 127,000,000     |                |           | 127,000,000     |  |   |   |   |
| Expected Income Tax Benefit                                                                      | 103,000,000     |                |           | 103,000,000     |  |   |   |   |
| **Pending Sale of Onshore US Properties [Abstract]**                                             |            |                |           |            |  |   |   |   |
| Onshore US Subsequent Asset Sales Proceeds                                                       | 937,000,000     |                |           | 937,000,000     |  |   |   |   |
| Onshore US Subsequent Asset Sales Net Book Value                                                 | 765,000,000     |                |           | 765,000,000     |  |   |   |   |
| **Total Purchase Price [Abstract]**                                                              |            |                |           |            |  |   |   |   |
| Unproved Oil and Gas Properties                                                                  | 853,000,000     |                |           | 853,000,000     |  |   |   |   |
| Proved Oil and Gas Properties                                                                    | 386,000,000     |                |           | 386,000,000     |  |   |   |   |
| Investment in CONE Gathering LLC                                                                 | 69,000,000      |                |           | 69,000,000      |  |   |   |   |
| Total Assets Acquired                                                                            | $ 1,308,000,000 | [1]            |           | $ 1,308,000,000 | [1] |   |   |   |
|                                                                                                  |
| [1]Total reflects impact of $17 million imputed interest on CONSOL installment payments.         |

| X                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Dollar amount of the remaining asset retirement obligations associated with our North Sea assets which have been reclassified to Assets Held for Sale.
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| X                                                                                                                                                                                                                                                                                                                                                           |
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The amount of acquisition cost of a business combination allocated to proved oil and gas properties.
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The amount of acquisition cost of a business combination allocated to unproved oil and gas properties.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
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| - Definition
The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.
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| X                                                                                                                                                                                                                                                                                                                                                                 |
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| - Definition
Noncurrent deferred tax liability associated with properties transferred to assets held for sale.
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| - Definition
The cash inflow expected to occur in the future associated with the sale of a oil and gas assets.
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| - Definition
Expected income tax benefit to be recognized upon closing of the sale and reversal of a deferred tax liability associated with certain North Sea assets in the third quarter of 2012.
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| X                                                                                                                                                                                                                                                                                                                                                     |
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| - Definition
Amount agreed upon to provide funding of the entity's joint venture future drilling and completion costs.
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| - Definition
Non-operated working interests in the Dumbarton and Lochranza fields, located in the UK sectir of the North Sea.
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| - Definition
The maximum amount of funding to be provided by the entity for future drilling and completion cost each calendar year.
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| - Definition
Average natural gas price agreed upon benchmark for funding of future drilling and completion costs (in MMBtu's). If the average price of gas drops below benchmark for 3 consecutive months, capital carry will to be suspended until the average price of gas rises above the benchmark for a 3 consecutive month period.
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Aggregate net book values of Onshore US assets approved by the entity's board of directors to be sold and agreed to between transacting parties subsequent to the balance sheet date.
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Aggregate value of proceeds to be received from Onshore US asset sales approved by the entity's board of directors and agreed to between transacting parties subsequent to the balance sheet date.
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| - Definition
Disclosure of the unamortized amount of the discount on the note or payable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount.
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| - Definition
The cash outflow for exploration and development of oil and gas properties in the period
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Number of years the entity expected to provide agreed upon funding of future drilling and completion costs.
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| - Definition
The ratio of funding on share of future drilling and completion costs as part of joint venture transaction.
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| - Definition
Number of remaining installment payments agreed upon to purchase joint venture partnership.
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| - Definition
Number of acres purchased in joint venture partnership agreement.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for current assets (assets with expected useful life shorter than one year or one operating cycle, whichever is longer) of a disposal group, including a component of the entity (discontinued operation), to be sold or that has subsequently been disposed of through sale, as of the financial statement date.
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| - Definition
The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the disposal group, including a component of the entity (discontinued operation), the aggregate of amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations 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.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
For the disposal group, including a component of the entity (discontinued operation), carrying amount of assets not otherwise specified in the taxonomy that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
+ References
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| - Definition
For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.
+ References
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| - Definition
Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.
+ References
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| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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| - Definition
This item represents the entity's ownership percentage in the investee multiplied by the investee's total equity.
+ References
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| - Definition
Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.
+ References
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| - Definition
The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).
+ References
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