| **Acquisitions and Dispositions (Details) (USD $)**                                                                                   | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]**                                          |           |                |   |   |  |   |  |
| Oil and Gas Sales                                                                                                                     | $ 54,000,000   |                | $ 45,000,000 | $ 194,000,000 |  | $ 271,000,000 |  |
| Income before income taxes                                                                                                            | 38,000,000     |                | 23,000,000 | 117,000,000 |  | 161,000,000 |  |
| Income tax expense                                                                                                                    | 3,000,000      |                | 73,000,000 | 50,000,000 |  | 139,000,000 |  |
| Operating Income (Loss), Net of Tax                                                                                                   | 35,000,000     |                | (50,000,000) | 67,000,000 |  | 22,000,000 |  |
| Gain on Sale, Net of Tax                                                                                                              | 22,000,000     |                | 0 | 22,000,000 |  | 0 |  |
| Discontinued Operations, Net of Tax                                                                                                   | 57,000,000     |                | (50,000,000) | 89,000,000 |  | 22,000,000 |  |
| **Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]**     |           |                |   |   |  |   |  |
| Cash Proceeds                                                                                                                         |           |                |   | (1,161,000,000) |  | (77,000,000) |  |
| Gain on Asset Sale                                                                                                                    | 157,000,000    | [1]            | 0 | 167,000,000 | [1] | 26,000,000 | [1] |
| **Marcellus Shale Joint Venture [Abstract]**                                                                                          |           |                |   |   |  |   |  |
| Equity Method Investment, Ownership Percentage                                                                                        |           |                | 50.00% |   |  | 50.00% |  |
| Undeveloped Acres Purchased (acres)                                                                                                   | 628,000        |                |   | 628,000 |  |   |  |
| Payments to Acquire Interest in Joint Venture                                                                                         |           |                |   | 938,000,000 |  |   |  |
| 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 |  |   |  |
| 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% |  |   |  |
| **Total Purchase Price [Abstract]**                                                                                                   |           |                |   |   |  |   |  |
| Unproved Oil and Gas Properties                                                                                                       | 803,000,000    |                |   | 803,000,000 |  |   |  |
| 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                                                                                                                 | 1,258,000,000  | [2]            |   | 1,258,000,000 | [2] |   |  |
| 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                                                                                                         |           |                |   | (256,000,000) |  |   |  |
| Goodwill Allocated to Assets Sold                                                                                                     |           |                |   | 0 |  |   |  |
| Asset Retirement Obligation Associated with Assets Sold                                                                               |           |                |   | 55,000,000 |  |   |  |
| Income Tax Benefit Recognized                                                                                                         |           |                |   | 106,000,000 |  |   |  |
| Other Closing Adjustments                                                                                                             |           |                |   | 0 |  |   |  |
| 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 |  |   |  |
| Net Book Value of Assets Sold                                                                                                         |           |                |   | (838,000,000) |  |   |  |
| Goodwill Allocated to Assets Sold                                                                                                     |           |                |   | (61,000,000) |  |   |  |
| Asset Retirement Obligation Associated with Assets Sold                                                                               |           |                |   | 20,000,000 |  |   |  |
| Income Tax Benefit Recognized                                                                                                         |           |                |   | 0 |  |   |  |
| Other Closing Adjustments                                                                                                             |           |                |   | 2,000,000 |  |   |  |
| Gain on Asset Sale                                                                                                                    |           |                |   | $ 167,000,000 |  |   |  |
|                                                                                                                                       |
| [1]See Note 3. Acquisitions and Divestitures.[2]Total reflects impact of $17 million imputed interest on CONSOL installment payments. |

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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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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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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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| - 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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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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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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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
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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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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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.
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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.
+ 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.
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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.
+ References
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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.
+ References
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| - Definition
Divestiture of long-lived, 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, furniture and fixtures, and computer equipment.
+ References
No definition available.
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