| **Segment Information (Details) (USD $)**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| Revenue from Third Parties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | $ 4,037,000,000 | [1] | $ 3,211,000,000 | [1] | $ 2,615,000,000 | [1] |
| Reclassification from AOCL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  | (20,000,000) | [2] |
| Income from Equity Method Investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 186,000,000     |  | 193,000,000 |  | 118,000,000 |  |
| Total Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 4,223,000,000   |  | 3,404,000,000 |  | 2,713,000,000 |  |
| DD&A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 1,370,000,000   |  | 878,000,000 |  | 819,000,000 |  |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 104,000,000     |  | 757,000,000 |  | 144,000,000 |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | (154,000,000)   |  | (25,000,000) |  | (113,000,000) |  |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | (75,000,000)    |  | (42,000,000) |  | (157,000,000) |  |
| Income (Loss) from Continuing Operations Before Income Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 1,356,000,000   |  | 502,000,000 |  | 848,000,000 |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 367,000,000     |  | 329,000,000 |  | 285,000,000 |  |
| Additions to Long-Lived Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 3,525,000,000   |  | 4,358,000,000 |  | 2,725,000,000 |  |
| Goodwill at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 635,000,000     |  | 696,000,000 |  | 696,000,000 |  |
| Total Assets at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 17,509,000,000  | [3] | 16,105,000,000 | [3] | 12,846,000,000 | [3] |
| Number of Operating Segments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 4               |  |   |  |   |  |
| Revenues from third parties for all foreign countries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 1,700,000,000   |  | 1,100,000,000 |  | 722,000,000 |  |
| Long-lived Assets in Foreign Countries                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 4,200,000,000   |  | 3,200,000,000 |  | 2,000,000,000 |  |
| United States [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |            |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| Revenue from Third Parties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 2,339,000,000   |  | 2,125,000,000 |  | 1,893,000,000 |  |
| Reclassification from AOCL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  | (20,000,000) | [2] |
| Income from Equity Method Investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 0               |  | 0 |  | 0 |  |
| Total Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 2,339,000,000   |  | 2,125,000,000 |  | 1,873,000,000 |  |
| DD&A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 929,000,000     |  | 732,000,000 |  | 719,000,000 |  |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 73,000,000      |  | 757,000,000 |  | 119,000,000 |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | (154,000,000)   |  | 0 |  | (113,000,000) |  |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | (76,000,000)    |  | (74,000,000) |  | (168,000,000) |  |
| Income (Loss) from Continuing Operations Before Income Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 806,000,000     |  | 96,000,000 |  | 713,000,000 |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 121,000,000     |  | 72,000,000 |  | 0 |  |
| Additions to Long-Lived Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 2,046,000,000   |  | 3,007,000,000 |  | 1,796,000,000 |  |
| Goodwill at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 635,000,000     |  | 696,000,000 |  | 696,000,000 |  |
| Total Assets at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 11,199,000,000  | [2] | 11,201,000,000 | [2] | 9,091,000,000 | [2] |
| West Africa [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |            |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| Revenue from Third Parties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 1,343,000,000   | [1] | 592,000,000 | [1] | 349,000,000 | [1] |
| Reclassification from AOCL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  | 0 |  |
| Income from Equity Method Investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 186,000,000     |  | 193,000,000 |  | 118,000,000 |  |
| Total Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 1,529,000,000   |  | 785,000,000 |  | 467,000,000 |  |
| DD&A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 255,000,000     |  | 69,000,000 |  | 39,000,000 |  |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 0               |  | 0 |  | 0 |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 0               |  | 0 |  | 0 |  |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 1,000,000       |  | 32,000,000 |  | 11,000,000 |  |
| Income (Loss) from Continuing Operations Before Income Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 1,074,000,000   |  | 561,000,000 |  | 355,000,000 |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 230,000,000     |  | 257,000,000 |  | 285,000,000 |  |
| Additions to Long-Lived Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 447,000,000     |  | 618,000,000 |  | 612,000,000 |  |
| Goodwill at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 0               |  | 0 |  | 0 |  |
| Total Assets at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 3,063,000,000   | [3] | 2,728,000,000 | [3] | 2,270,000,000 | [3] |
| Eastern Mediterranean [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| Revenue from Third Parties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 178,000,000     | [1] | 307,000,000 | [1] | 191,000,000 | [1] |
| Reclassification from AOCL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  | 0 |  |
| Income from Equity Method Investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 0               |  | 0 |  | 0 |  |
| Total Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 178,000,000     |  | 307,000,000 |  | 191,000,000 |  |
| DD&A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 111,000,000     |  | 25,000,000 |  | 22,000,000 |  |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 31,000,000      |  | 0 |  | 25,000,000 |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 0               |  | 0 |  | 0 |  |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 0               |  | 0 |  | 0 |  |
| Income (Loss) from Continuing Operations Before Income Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 9,000,000       |  | 228,000,000 |  | 119,000,000 |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 0               |  | 0 |  | 0 |  |
| Additions to Long-Lived Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 869,000,000     |  | 687,000,000 |  | 270,000,000 |  |
| Goodwill at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 0               |  | 0 |  | 0 |  |
| Total Assets at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 2,572,000,000   | [3] | 1,751,000,000 | [3] | 919,000,000 | [3] |
| Other International And Corporate [Member]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  |   |  |
| **Segment Reporting Information [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |            |  |   |  |   |  |
| Revenue from Third Parties                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 177,000,000     | [1] | 187,000,000 | [1] | 182,000,000 | [1] |
| Reclassification from AOCL                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |            |  |   |  | 0 |  |
| Income from Equity Method Investees                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 0               |  | 0 |  | 0 |  |
| Total Revenues                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 177,000,000     |  | 187,000,000 |  | 182,000,000 |  |
| DD&A                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 75,000,000      |  | 52,000,000 |  | 39,000,000 |  |
| Asset Impairments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 0               |  | 0 |  | 0 |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     | 0               |  | (25,000,000) |  | 0 |  |
| Gain on Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 0               |  | 0 |  | 0 |  |
| Income (Loss) from Continuing Operations Before Income Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | (533,000,000)   |  | (383,000,000) |  | (339,000,000) |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                | 16,000,000      |  | 0 |  | 0 |  |
| Additions to Long-Lived Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 163,000,000     |  | 46,000,000 |  | 47,000,000 |  |
| Goodwill at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 0               |  | 0 |  | 0 |  |
| Total Assets at End of Year                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | $ 675,000,000   | [3] | $ 425,000,000 | [3] | $ 566,000,000 | [3] |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| [1]Revenues from third parties for all foreign countries, in total, were $1.7 billion in 2012, $1.1 billion in 2011, and $722 million in 2010.[2]Revenues for the year ended December 31, 2010 include decreases resulting from hedging activities. The decreases resulted from hedge gains and losses that were deferred in AOCL, as a result of previous cash flow hedge accounting, and subsequently reclassified to revenues. All hedge gains and losses had been reclassified to revenues by December 31, 2010.[3]Long-lived assets located in all foreign countries, in total, were $4.2 billion, $3.2 billion, and $2.0 billion at December 31, 2012, 2011, and 2010 respectively. |

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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.
+ References
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| - Definition
Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net gains or losses on a cash flow hedge reclassified to revenues from accumulated other comprehensive income.
+ References
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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.
+ References
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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
Amount of long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets, located in foreign countries in total in which the entity holds assets.
+ References
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| - Definition
Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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
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.
+ References
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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
Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.
+ References
No definition available.
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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.
+ References
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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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