| **Capitalized Exploratory Well Costs (Details) (USD $)In Millions, unless otherwise specified**                                             | 6 Months Ended |        |
|---------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|
||
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Capitalized Exploratory Well Costs, Beginning of Period                                                                                     | $ 900          |   |
| Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves                                                    | 313            |   |
| Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves                                                     | (18)           |   |
| Capitalized Exploratory Well Cost, Charged to Expense                                                                                       | (3)            |   |
| Capitalized Exploratory Well Costs, End of Period                                                                                           | 1,192          |   |
| Exploratory Well Costs capitalized for a Period of One Year or Less                                                                         | 523            | 355    |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 669            | 545    |
| Capitalized Exploratory Well Costs, End of Period                                                                                           | 1,192          |   |
| Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 13             | 14     |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 669            | 545    |
| Suspended Since 2012                                                                                                                        | 124            |   |
| Suspended Since 2011                                                                                                                        | 272            |   |
| Suspended since 2010 & prior                                                                                                            | 273            |   |
| Carla Offshore Equatorial Guinea                                                                                                            |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 12             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 12             |   |
| Suspended Since 2012                                                                                                                        | 0              |   |
| Suspended Since 2011                                                                                                                        | 12             |   |
| Suspended since 2010 & prior                                                                                                            | 0              |   |
| Diega Offshore Equatorial Guinea                                                                                                            |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 105            |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 105            |   |
| Suspended Since 2012                                                                                                                        | 0              |   |
| Suspended Since 2011                                                                                                                        | 46             |   |
| Suspended since 2010 & prior                                                                                                            | 59             |   |
| Felicita Offshore Equatorial Guinea                                                                                                         |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 36             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 36             |   |
| Suspended Since 2012                                                                                                                        | 1              |   |
| Suspended Since 2011                                                                                                                        | 2              |   |
| Suspended since 2010 & prior                                                                                                            | 33             |   |
| Yolanda Offshore Equatorial Guinea                                                                                                          |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 18             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 18             |   |
| Suspended Since 2012                                                                                                                        | 0              |   |
| Suspended Since 2011                                                                                                                        | 1              |   |
| Suspended since 2010 & prior                                                                                                            | 17             |   |
| YoYo Offshore Cameron                                                                                                                       |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 50             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 50             |   |
| Suspended Since 2012                                                                                                                        | 5              |   |
| Suspended Since 2011                                                                                                                        | 5              |   |
| Suspended since 2010 & prior                                                                                                            | 40             |   |
| Leviathan Offshore Israel                                                                                                                   |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 128            |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 128            |   |
| Suspended Since 2012                                                                                                                        | 20             |   |
| Suspended Since 2011                                                                                                                        | 67             |   |
| Suspended since 2010 & prior                                                                                                            | 41             |   |
| Proposed Gross Working Interest to Sell to Woodside                                                                                         | 30.00%         |   |
| Leviathan-1 Deep Offshore Israel                                                                                                            |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 71             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 71             |   |
| Suspended Since 2012                                                                                                                        | 43             |   |
| Suspended Since 2011                                                                                                                        | 28             |   |
| Suspended since 2010 & prior                                                                                                            | 0              |   |
| Tanin 1 Offshore Israel                                                                                                                     |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 34             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 34             |   |
| Suspended Since 2012                                                                                                                        | 2              |   |
| Suspended Since 2011                                                                                                                        | 32             |   |
| Suspended since 2010 & prior                                                                                                            | 0              |   |
| Dolphin 1 Offshore Israel                                                                                                                   |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 22             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 22             |   |
| Suspended Since 2012                                                                                                                        | 0              |   |
| Suspended Since 2011                                                                                                                        | 22             |   |
| Suspended since 2010 & prior                                                                                                            | 0              |   |
| Dalit Offshore Israel                                                                                                                       |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 22             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 22             |   |
| Suspended Since 2012                                                                                                                        | 0              |   |
| Suspended Since 2011                                                                                                                        | 0              |   |
| Suspended since 2010 & prior                                                                                                            | 22             |   |
| Cyprus A-1 Offshore Cyprus                                                                                                                  |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 65             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 65             |   |
| Suspended Since 2012                                                                                                                        | 8              |   |
| Suspended Since 2011                                                                                                                        | 57             |   |
| Suspended since 2010 & prior                                                                                                            | 0              |   |
| Gunflint Deepwater Gulf Of Mexico                                                                                                           |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 87             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 87             |   |
| Suspended Since 2012                                                                                                                        | 35             |   |
| Suspended Since 2011                                                                                                                        | 0              |   |
| Suspended since 2010 & prior                                                                                                            | 52             |   |
| Other - Projects of $10 million or less each                                                                                                |           |   |
| **Capitalized Exploratory Well Costs [Abstract]**                                                                                           |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 19             |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]**                 |           |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                        | 19             |   |
| Suspended Since 2012                                                                                                                        | 10             |   |
| Suspended Since 2011                                                                                                                        | 0              |   |
| Suspended since 2010 & prior                                                                                                            | $ 9            |   |

| X                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The partners in the Leviathan Project have agreed in principle on a proposal to sell a working interest in the Leviathan Licenses to Woodisde Energy Ltd.
+ References
No definition available.
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| - Definition
Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized exploratory well costs that were expensed during the year because proved reserves were not found at the exploratory well.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS19-1 -Paragraph 10 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of capitalized exploratory well costs that have been capitalized for a period  greater than or equal to one year but less than two years after the completion of drilling at balance sheet date.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of capitalized exploratory well costs that have been capitalized for a period greater than or equal to two years but less than three years after the completion of drilling at balance sheet date.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of capitalized exploratory well costs that have been capitalized for a period greater than or equal to five years after completion of drilling at balance sheet date.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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