| **Acquisitions and Divestitures (Details) (USD $)**                                                                                   | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]**                                          |            |  |   |   |
| Oil and Gas Sales                                                                                                                     | $ 208,000,000   |  | $ 357,000,000 | $ 309,000,000 |
| Exploration Expense - Selkirk                                                                                                         | 27,000,000      |  |   |   |
| Income Before Income Taxes                                                                                                            | 101,000,000     |  | 215,000,000 | 183,000,000 |
| Income Tax Expense                                                                                                                    | 55,000,000      |  | 174,000,000 | 89,000,000 |
| Operating Income, Net of Tax                                                                                                          | 46,000,000      |  | 41,000,000 | 94,000,000 |
| Gain on Sale, Net of Tax                                                                                                              | 16,000,000      |  | 0 | 0 |
| Discontinued Operations, Net of Tax                                                                                                   | 62,000,000      |  | 41,000,000 | 94,000,000 |
| **North Sea Divestiture [Abstract]**                                                                                                  |            |  |   |   |
| Interest in Dumbarton and Lochranza Fields                                                                                            | 30.00%          |  |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]**     |            |  |   |   |
| Cash Proceeds                                                                                                                         | 1,160,000,000   |  | 77,000,000 | 564,000,000 |
| Goodwill Allocated to Assets Sold                                                                                                     | (61,000,000)    | [1] | 0 |   |
| Gain on Divestitures                                                                                                                  | 154,000,000     |  | 25,000,000 | 113,000,000 |
| **Marcellus Shale Joint Venture [Abstract]**                                                                                          |            |  |   |   |
| CONSOL JV, Ownership Percentage                                                                                                       |            |  | 50.00% |   |
| Acreage Acquired (acres)                                                                                                              |            |  | 628,000 |   |
| Payments to Date to Acquire Interest in CONSOL JV                                                                                     | 938,000,000     |  |   |   |
| Ratio of funding on share of future drilling and completion costs                                                                     |            |  | 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 |   |
| Natural gas price agreed upon benchmark, average                                                                                      |            |  | 4.00 |   |
| Imputed interest on CONSOL Installment Payments                                                                                       | 17,000,000      |  |   |   |
| **Total Purchase Price [Abstract]**                                                                                                   |            |  |   |   |
| Unproved Oil and Gas Properties                                                                                                       | 803,000,000     |  |   |   |
| Proved Oil and Gas Properties                                                                                                         | 386,000,000     |  |   |   |
| Investment in CONE Gathering LLC                                                                                                      | 69,000,000      |  |   |   |
| Total Assets Acquired                                                                                                                 | 1,258,000,000   | [2] | 1,300,000,000 |   |
| US Onshore Assets Sold [Member]                                                                                                       |            |  |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]**     |            |  |   |   |
| Cash Proceeds                                                                                                                         | 1,044,000,000   |  |   | 552,000,000 |
| Net Book Value of Assets Sold                                                                                                         | (836,000,000)   |  |   | (394,000,000) |
| Goodwill Allocated to Assets Sold                                                                                                     | (61,000,000)    |  |   | (61,000,000) |
| Asset Retirement Obligations Associated with Assets Sold                                                                              | 20,000,000      |  |   | 10,000,000 |
| Other Closing Adjustments                                                                                                             | (13,000,000)    |  |   | 3,000,000 |
| Gain on Divestitures                                                                                                                  | (154,000,000)   |  |   | (110,000,000) |
| North Sea Assets Sold [Member]                                                                                                        |            |  |   |   |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]**     |            |  |   |   |
| Cash Proceeds                                                                                                                         | 117,000,000     |  |   |   |
| Net Book Value of Assets Sold                                                                                                         | 255,000,000     |  |   |   |
| Deferred Tax Liability Release                                                                                                        | 99,000,000      |  |   |   |
| Asset Retirement Obligations Associated with Assets Sold                                                                              | $ 55,000,000    |  |   |   |
|                                                                                                                                       |
| [1]See Note 3. Acquisitions and Divestitures.[2]Total reflects impact of $17 million imputed interest on CONSOL installment payments. |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.
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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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For the disposal group, including a component of the entity (discontinued operation), the net book value of oil and gas properties, carried under the successful efforts method, to be sold.
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For the disposal group, obligations not otherwise itemized.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exploration expenses (including prospecting) related to our Selkirk well and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.
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Amount agreed upon to provide funding of the entity's joint venture future drilling and completion costs.
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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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Non-operated working interests in the Dumbarton and Lochranza fields, located in the UK sectir of the North Sea.
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The maximum amount of funding to be provided by the entity for future drilling and completion cost each calendar year.
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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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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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The ratio of funding on share of future drilling and completion costs as part of joint venture transaction.
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| - Definition
The amount of acquisition cost of a business combination allocated to assets acquired.
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| - Definition
Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.
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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.
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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.
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This element represents the aggregate cost of investments accounted for under the equity method of accounting.
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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
Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Write-off of the carrying amount of goodwill associated with all or a portion of a reporting unit that is sold in the period.
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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.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount 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.
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| - Definition
The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.
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| - Definition
The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.
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