| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Narrative (Details) - USD ($) $ in Millions** | 12 Months Ended |
|----------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | $ 2,800         |   |   |
| Impairment of Leasehold                                                                                              | 62              | $ 93 | $ 21 |
| Gulf of Mexico                                                                                                       |            |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | 44              |   |   |
| International                                                                                                        |            |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | 53              |   |   |
| Clayton Williams Energy | Delaware Basin                                                                             |            |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | 1,600           |   |   |
| Rosetta Merger | Delaware Basin                                                                                      |            |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | 1,100           |   |   |
| Rosetta Merger | Eagle Ford Shale                                                                                    |            |   |   |
| **Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]**                             |            |   |   |
| Capitalized undeveloped leasehold cost                                                                               | $ 149           |   |   |

| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Undeveloped Leasehold Cost
+ References
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=98514028&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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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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