| **Capitalized Exploratory Well Costs (Details 2) - USD ($) $ in Millions**                           | 12 Months Ended |         |
|------------------------------------------------------------------------------------------------------|-----------------|---------|
||
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Cost threshold                                                                                       | $ 20            |    |   |   |
| Capitalized undeveloped leasehold cost                                                               | 2,200           |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 699             | $ 1,258 | $ 1,090 |   |
| Undeveloped Leasehold Impairment                                                                     | 93              | $ 21    | $ 0 |   |
| Provision for losses                                                                                 | 34              |    |   |   |
| Suspended Since 2013 and 2014                                                                        |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 183             |    |   |   |
| Suspended Since 2011 and 2012                                                                        |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 263             |    |   |   |
| Suspended Since 2010 and Prior                                                                       |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 253             |    |   |   |
| Troubadour                                                                                           |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 52              |    |   |   |
| Troubadour | Suspended Since 2013 and 2014                                                           |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 5               |    |   |   |
| Troubadour | Suspended Since 2011 and 2012                                                           |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 47              |    |   |   |
| Troubadour | Suspended Since 2010 and Prior                                                          |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 0               |    |   |   |
| Katmai                                                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 98              |    |   |   |
| Katmai | Suspended Since 2013 and 2014                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 98              |    |   |   |
| Katmai | Suspended Since 2011 and 2012                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 0               |    |   |   |
| Katmai | Suspended Since 2010 and Prior                                                              |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 0               |    |   |   |
| Yolanda Offshore Equatorial Guinea [Member]                                                          |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 45              |    |   |   |
| Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2013 and 2014                          |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 7               |    |   |   |
| Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2011 and 2012                          |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 9               |    |   |   |
| Yolanda Offshore Equatorial Guinea [Member] | Suspended Since 2010 and Prior                         |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 29              |    |   |   |
| Yolanda (Block I)                                                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 22              |    |   |   |
| Yolanda (Block I) | Suspended Since 2013 and 2014                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 3               |    |   |   |
| Yolanda (Block I) | Suspended Since 2011 and 2012                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 5               |    |   |   |
| Yolanda (Block I) | Suspended Since 2010 and Prior                                                   |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 14              |    |   |   |
| YoYo (YoYo Block)                                                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 54              |    |   |   |
| YoYo (YoYo Block) | Suspended Since 2013 and 2014                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 6               |    |   |   |
| YoYo (YoYo Block) | Suspended Since 2011 and 2012                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 13              |    |   |   |
| YoYo (YoYo Block) | Suspended Since 2010 and Prior                                                   |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 35              |    |   |   |
| Leviathan                                                                                            |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 199             |    |   |   |
| Leviathan | Suspended Since 2013 and 2014                                                            |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 18              |    |   |   |
| Leviathan | Suspended Since 2011 and 2012                                                            |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 77              |    |   |   |
| Leviathan | Suspended Since 2010 and Prior                                                           |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 104             |    |   |   |
| Leviathan-1 Deep                                                                                     |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 85              |    |   |   |
| Leviathan-1 Deep | Suspended Since 2013 and 2014                                                     |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 7               |    |   |   |
| Leviathan-1 Deep | Suspended Since 2011 and 2012                                                     |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 51              |    |   |   |
| Leviathan-1 Deep | Suspended Since 2010 and Prior                                                    |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 27              |    |   |   |
| Dalit                                                                                                |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 31              |    |   |   |
| Dalit | Suspended Since 2013 and 2014                                                                |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 4               |    |   |   |
| Dalit | Suspended Since 2011 and 2012                                                                |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 7               |    |   |   |
| Dalit | Suspended Since 2010 and Prior                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 20              |    |   |   |
| Cyprus                                                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 89              |    |   |   |
| Cyprus | Suspended Since 2013 and 2014                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 12              |    |   |   |
| Cyprus | Suspended Since 2011 and 2012                                                               |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 54              |    |   |   |
| Cyprus | Suspended Since 2010 and Prior                                                              |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 23              |    |   |   |
| Projects less than $20 million                                                                       |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 24              |    |   |   |
| Projects less than $20 million | Suspended Since 2013 and 2014                                       |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 23              |    |   |   |
| Projects less than $20 million | Suspended Since 2011 and 2012                                       |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 0               |    |   |   |
| Projects less than $20 million | Suspended Since 2010 and Prior                                      |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling | 1               |    |   |   |
| Onshore US                                                                                           |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Capitalized undeveloped leasehold cost                                                               | 2,100           |    |   |   |
| Deepwater Gulf of Mexico                                                                             |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Capitalized undeveloped leasehold cost                                                               | 105             |    |   |   |
| International                                                                                        |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Capitalized undeveloped leasehold cost                                                               | 32              |    |   |   |
| Cyprus Block 12                                                                                      |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Total consideration value                                                                            |            |    |   | $ 131 |
| Gulf of Mexico and Falkland Island                                                                   |            |    |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**             |            |    |   |   |
| Capitalized undeveloped leasehold cost                                                               | $ 127           |    |   |   |

| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Undeveloped Leasehold Cost
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No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Well Project Cost Threshold
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No definition available.
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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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph b -URI http://asc.fasb.org/extlink&oid=68064819&loc=SL6806780-109447
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| - Definition
Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228
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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.
+ References
No definition available.
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| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524
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