| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Exploratory Well Costs (Details) $ in Millions**                               | 12 Months Ended |        |         |        |
|-------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|--------|---------|--------|
||
| **Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]**                        |            |   |    |   |   |   |
| Capitalized Exploratory Well Costs, Beginning of Period                                                                                               | $ 520           | $ 768  | $ 1,353 |   |   |   |
| Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves                                                              | 7               | 20     | 84      |   |   |   |
| Divestitures and Other                                                                                                                                | (168)           | 0      | (143)   |   |   |   |
| Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves or to Assets Held for Sale                                    | (1)             | (203)  | (1)     |   |   |   |
| Capitalized Exploratory Well Costs Charged to Expense                                                                                                 | (4)             | (65)   | (525)   |   |   |   |
| Capitalized Exploratory Well Costs, End of Period                                                                                                     | 354             | 520    | 768     |   |   |   |
| **Exploratory Wells Drilled [Line Items]**                                                                                                            |            |   |    |   |   |   |
| Ownership interest sold                                                                                                                               |            |   |    |   |   | 35.00% |
| Exploratory Well Costs Capitalized for a Period of One Year or Less                                                                                   |            |   |    | $ 6    | $ 10 | $ 69 |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                  |            |   |    | 348    | 510 | 699 |
| Balance at End of Period                                                                                                                              | $ 520           | $ 520  | $ 768   | $ 354  | $ 520 | $ 768 |
| Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling | project |            |   |    | 7      | 8 | 10 |
| Cyprus Block 12                                                                                                                                       |            |   |    |   |   |   |
| **Exploratory Wells Drilled [Line Items]**                                                                                                            |            |   |    |   |   |   |
| Ownership interest sold                                                                                                                               |            |   |    | 35.00% |   |   |

| X                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Exploratory Well Cost, Other
+ References
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| - Definition
Disposal Group, Not Discontinued Operation, Percentage Sold
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expense for capitalized exploratory well costs for which proved reserves were not found at the exploratory well.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of capitalized exploratory well costs that is pending the determination of proved reserves. This does not include amounts that were capitalized and subsequently expensed in the same annual period.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of exploratory well costs that have been capitalized for a period of one year or less after the completion of drilling.
+ References
No definition available.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of projects for which exploratory well costs have been capitalized for a period of greater than one year after the completion of drilling.
+ References
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| - Definition
Previously capitalized costs of the drilling of wells that were reclassified as part of the costs of the enterprise's wells and related equipment and facilities at the time that proved reserves were found.
+ References
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