| **Segment Information (Details) (USD $)In Millions, unless otherwise specified**                                                                                                                                                 | 3 Months Ended | 6 Months Ended |        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| Revenues from Third Parties                                                                                                                                                                                                      | $ 934          |                | $ 794  |  | $ 1,970 |  | $ 1,533 |  |   |
| Income from Equity Method Investees                                                                                                                                                                                              | 32             |                | 48     |  | 86 |  | 96 |  |   |
| Total Revenues                                                                                                                                                                                                                   | 966            |                | 842    |  | 2,056 |  | 1,629 |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                         | 325            |                | 211    |  | 619 |  | 404 |  |   |
| Asset Impairments                                                                                                                                                                                                                | 73             | [1]            | 131    | [1] | 73 | [1] | 137 | [1] |   |
| Gain on Divestitures                                                                                                                                                                                                             | (9)            |                | (25)   | [2] | (9) |  | (26) | [2] |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                  | (276)          | [3]            | (143)  | [3] | (180) |  | 143 | [3] |   |
| Income from Continuing Operations Before Income Taxes                                                                                                                                                                            | 390            |                | 356    |  | 724 |  | 325 |  |   |
| Goodwill                                                                                                                                                                                                                         | 696            |                |   |  | 696 |  |   |  | 696 |
| Total Assets                                                                                                                                                                                                                     | 16,657         |                |   |  | 16,657 |  |   |  | 16,106 |
| United States [Member]                                                                                                                                                                                                           |           |                |   |  |   |  |   |  |   |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| Revenues from Third Parties                                                                                                                                                                                                      | 527            |                | 553    |  | 1,080 |  | 1,059 |  |   |
| Income from Equity Method Investees                                                                                                                                                                                              | 1              |                | 0      |  | 3 |  | 0 |  |   |
| Total Revenues                                                                                                                                                                                                                   | 528            |                | 553    |  | 1,083 |  | 1,059 |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                         | 232            |                | 187    |  | 430 |  | 354 |  |   |
| Asset Impairments                                                                                                                                                                                                                | 73             | [1]            | 131    | [1] | 73 | [1] | 137 | [1] |   |
| Gain on Divestitures                                                                                                                                                                                                             | (9)            |                | 0      | [2] | (9) |  | (1) | [2] |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                  | (93)           | [3]            | (142)  | [3] | (102) |  | 50 | [3] |   |
| Income from Continuing Operations Before Income Taxes                                                                                                                                                                            | 48             |                | 250    |  | 241 |  | 213 |  |   |
| Goodwill                                                                                                                                                                                                                         | 696            |                |   |  | 696 |  |   |  | 696 |
| Total Assets                                                                                                                                                                                                                     | 11,188         |                |   |  | 11,188 |  |   |  | 11,201 |
| West Africa [Member]                                                                                                                                                                                                             |           |                |   |  |   |  |   |  |   |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| Revenues from Third Parties                                                                                                                                                                                                      | 332            |                | 118    |  | 715 |  | 248 |  |   |
| Income from Equity Method Investees                                                                                                                                                                                              | 31             |                | 48     |  | 83 |  | 96 |  |   |
| Total Revenues                                                                                                                                                                                                                   | 363            |                | 166    |  | 798 |  | 344 |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                         | 62             |                | 7      |  | 135 |  | 17 |  |   |
| Asset Impairments                                                                                                                                                                                                                | 0              | [1]            | 0      | [1] | 0 | [1] | 0 | [1] |   |
| Gain on Divestitures                                                                                                                                                                                                             | 0              |                | 0      | [2] | 0 |  | 0 | [2] |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                  | (183)          | [3]            | (1)    | [3] | (78) |  | 93 | [3] |   |
| Income from Continuing Operations Before Income Taxes                                                                                                                                                                            | 455            |                | 116    |  | 682 |  | 190 |  |   |
| Goodwill                                                                                                                                                                                                                         | 0              |                |   |  | 0 |  |   |  | 0 |
| Total Assets                                                                                                                                                                                                                     | 2,761          |                |   |  | 2,761 |  |   |  | 2,728 |
| Eastern Mediterranean [Member]                                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| Revenues from Third Parties                                                                                                                                                                                                      | 29             |                | 76     |  | 73 |  | 128 |  |   |
| Income from Equity Method Investees                                                                                                                                                                                              | 0              |                | 0      |  | 0 |  | 0 |  |   |
| Total Revenues                                                                                                                                                                                                                   | 29             |                | 76     |  | 73 |  | 128 |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                         | 10             |                | 7      |  | 15 |  | 11 |  |   |
| Asset Impairments                                                                                                                                                                                                                | 0              | [1]            | 0      | [1] | 0 | [1] | 0 | [1] |   |
| Gain on Divestitures                                                                                                                                                                                                             | 0              |                | 0      | [2] | 0 |  | 0 | [2] |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                  | 0              | [3]            | 0      | [3] | 0 |  | 0 | [3] |   |
| Income from Continuing Operations Before Income Taxes                                                                                                                                                                            | 5              |                | 57     |  | 37 |  | 96 |  |   |
| Goodwill                                                                                                                                                                                                                         | 0              |                |   |  | 0 |  |   |  | 0 |
| Total Assets                                                                                                                                                                                                                     | 2,289          |                |   |  | 2,289 |  |   |  | 1,751 |
| Other International And Corporate [Member]                                                                                                                                                                                       |           |                |   |  |   |  |   |  |   |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                   |           |                |   |  |   |  |   |  |   |
| Revenues from Third Parties                                                                                                                                                                                                      | 46             |                | 47     |  | 102 |  | 98 |  |   |
| Income from Equity Method Investees                                                                                                                                                                                              | 0              |                | 0      |  | 0 |  | 0 |  |   |
| Total Revenues                                                                                                                                                                                                                   | 46             |                | 47     |  | 102 |  | 98 |  |   |
| Depreciation, Depletion and Amortization                                                                                                                                                                                         | 21             |                | 10     |  | 39 |  | 22 |  |   |
| Asset Impairments                                                                                                                                                                                                                | 0              | [1]            | 0      | [1] | 0 | [1] | 0 | [1] |   |
| Gain on Divestitures                                                                                                                                                                                                             | 0              |                | (25)   | [2] | 0 |  | (25) | [2] |   |
| (Gain) Loss on Commodity Derivative Instruments                                                                                                                                                                                  | 0              | [3]            | 0      | [3] | 0 |  | 0 | [3] |   |
| Income from Continuing Operations Before Income Taxes                                                                                                                                                                            | (118)          |                | (67)   |  | (236) |  | (174) |  |   |
| Goodwill                                                                                                                                                                                                                         | 0              |                |   |  | 0 |  |   |  | 0 |
| Total Assets                                                                                                                                                                                                                     | $ 419          |                |   |  | $ 419 |  |   |  | $ 426 |
|                                                                                                                                                                                                                                  |
| [1]See Note 4. Asset Impairments.[2]Amount relates primarily to the transfer of our Ecuador assets to the Ecuadorian government. See Note 2. Basis of Presentation.[3]See Note 6. Derivative Instruments and Hedging Activities. |

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| - Definition
Sum of carrying amounts as of balance sheet date of all assets (with the exception of assets that are held for sale) that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or results.
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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
Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.
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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.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.
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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
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, 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
Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.
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| - Definition
Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.
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