| **Consolidated Statements of Operations (unaudited) - USD ($) shares in Millions, $ in Millions**                                                                                                                                               | 3 Months Ended | 6 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Revenues**                                                                                                                                                                                                                                    |           |                |   |  |   |   |
| Oil, Gas and NGL Sales                                                                                                                                                                                                                          | $ 722          |                | $ 1,338 |  | $ 1,462 | $ 2,665 |
| Income from Equity Method Investees                                                                                                                                                                                                             | 6              |                | 45 |  | 24 | 97 |
| Other                                                                                                                                                                                                                                           | 2              |                | 0 |  | 4 | 0 |
| Total                                                                                                                                                                                                                                           | 730            |                | 1,383 |  | 1,490 | 2,762 |
| **Costs and Expenses**                                                                                                                                                                                                                          |           |                |   |  |   |   |
| Production Expense                                                                                                                                                                                                                              | 213            |                | 244 |  | 459 | 474 |
| Exploration Expense                                                                                                                                                                                                                             | 41             |                | 59 |  | 106 | 133 |
| Depreciation, Depletion and Amortization                                                                                                                                                                                                        | 451            |                | 413 |  | 905 | 837 |
| General and Administrative                                                                                                                                                                                                                      | 104            |                | 127 |  | 198 | 266 |
| Asset Impairments                                                                                                                                                                                                                               | 15             |                | 34 |  | 43 | 131 |
| Other Operating (Income) Expense, Net                                                                                                                                                                                                           | 67             |                | (23) |  | 73 | (12) |
| Total                                                                                                                                                                                                                                           | 891            |                | 854 |  | 1,784 | 1,829 |
| Operating Income (Loss)                                                                                                                                                                                                                         | (161)          |                | 529 |  | (294) | 933 |
| **Other (Income) Expense**                                                                                                                                                                                                                      |           |                |   |  |   |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                                 | 87             |                | 236 |  | (63) | 311 |
| Interest, Net of Amount Capitalized                                                                                                                                                                                                             | 54             |                | 52 |  | 112 | 99 |
| Other Non-Operating (Income) Expense, Net                                                                                                                                                                                                       | (9)            |                | 8 |  | (9) | 13 |
| Total                                                                                                                                                                                                                                           | 132            |                | 296 |  | 40 | 423 |
| Income (Loss) Before Income Taxes                                                                                                                                                                                                               | (293)          |                | 233 |  | (334) | 510 |
| Income Tax (Benefit) Provision                                                                                                                                                                                                                  | (184)          |                | 41 |  | (203) | 118 |
| Net Income (Loss)                                                                                                                                                                                                                               | $ (109)        |                | $ 192 |  | $ (131) | $ 392 |
| **Earnings Per Share, Basic [Abstract]**                                                                                                                                                                                                        |           |                |   |  |   |   |
| Net Income (in dollars per share)                                                                                                                                                                                                               | $ (0.28)       |                | $ 0.53 |  | $ (0.35) | $ 1.09 |
| **Earnings Per Share, Diluted [Abstract]**                                                                                                                                                                                                      |           |                |   |  |   |   |
| Net Income (in dollars per share)                                                                                                                                                                                                               | $ (0.28)       |                | $ 0.52 |  | $ (0.35) | $ 1.07 |
| **Weighted Average Number of Shares Outstanding [Abstract]**                                                                                                                                                                                    |           |                |   |  |   |   |
| Weighted Average Number of Shares Outstanding, Basic (in shares)                                                                                                                                                                                | 387            | [1]            | 361 | [1] | 378 | 361 |
| Weighted Average Number of Shares Outstanding, Diluted (in shares)                                                                                                                                                                              | 387            |                | 366 |  | 378 | 365 |
|                                                                                                                                                                                                                                                 |
| [1]The weighted average number of shares outstanding includes the weighted average shares of common stock issued in connection with the underwritten public offering of 24,150,000 shares of common stock of the Company in first quarter 2015. |

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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
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| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
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| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exploration expenses (including prospecting) related to oil and gas producing entities 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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| - Definition
Revenue related to midstream and downstream gas activities. May include the following: gathering from wells, processing to remove impurities, storage, transmission, and the sale of natural gas and related products.
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| - Definition
The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
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| - Definition
The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.
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| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).
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| - Definition
Revenue from the sale of oil and gas during the period.
+ References
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.
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| - Definition
The net result for the period of deducting operating expenses from operating revenues.
+ References
No definition available.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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| - Definition
The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
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| - Definition
Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
+ References
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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| - Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
+ References
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
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