| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs (Details) - USD ($) $ in Millions**                                                                        | 3 Months Ended | 9 Months Ended |         |        |         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|---------|--------|---------|
||
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Capitalized Exploratory Well Costs, Beginning of Period                                                                                                                         |                |           | $ 1,353 |   |    |   |   |
| Additions to Capitalized Exploratory Well Costs Pending Determination of Proved Reserves                                                                                        |                |           | 83      |   |    |   |   |
| Reclassified to Proved Oil and Gas Properties Based on Determination of Proved Reserves                                                                                         |                |           | (1)     |   |    |   |   |
| Capitalized Exploratory Well Cost, Charged to Expense                                                                                                                           | [1]            |           | (83)    |   |    |   |   |
| Capitalized Exploratory Well Costs, End of Period                                                                                                                               |                | $ 1,209        | 1,209   |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period of One Year or Less                                                                                                             |                |           |    |   | $ 91    |   | $ 95 |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 1,118   |   | 1,258 |
| Capitalized Exploratory Well Costs, End of Period                                                                                                                               |                | 1,209          | 1,353   |   | $ 1,209 |   | $ 1,353 |
| Number of Projects with Exploratory Well Costs That Have Been Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                     |                |           |    |   | 13      |   | 14 |
| Percentage of divestiture farmed out                                                                                                                                            |                |           |    |   | 35.00%  |   | 35.00% |
| Capitalized undeveloped leasehold cost                                                                                                                                          |                | 105            | 2,000   |   |    |   |   |
| Leasehold impairment                                                                                                                                                            |                | 81             | 81      | $ 0    |    |   |   |
| Valuation allowance increase                                                                                                                                                    |                | $ 24           |    |   |    |   |   |
| Onshore US [Member]                                                                                                                                                             |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Capitalized undeveloped leasehold cost                                                                                                                                          |                |           | 1,900   |   |    |   |   |
| International [Member]                                                                                                                                                          |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Capitalized undeveloped leasehold cost                                                                                                                                          |                |           | 32      |   |    |   |   |
| Deepwater Gulf of Mexico [Member]                                                                                                                                               |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Capitalized undeveloped leasehold cost                                                                                                                                          |                |           | $ 116   |   |    |   |   |
| Katmai Deepwater Gulf Of Mexico [Member]                                                                                                                                        |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | $ 97    |   |   |
| Troubadour Deepwater Gulf of Mexico [Member]                                                                                                                                    |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 52      |   |   |
| Diega (including Carmen) Offshore Equatorial Guinea [Member]                                                                                                                    |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 240     |   |   |
| Carla Offshore Equatorial Guinea [Member]                                                                                                                                       |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 184     |   |   |
| YoYo Offshore Cameron [Member]                                                                                                                                                  |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 53      |   |   |
| Leviathan Offshore Israel [Member]                                                                                                                                              |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 196     |   |   |
| Leviathan-1 Deep Offshore Israel [Member]                                                                                                                                       |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 84      |   |   |
| Dalit Offshore Israel [Member]                                                                                                                                                  |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 31      |   |   |
| Cyprus [Member]                                                                                                                                                                 |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 88      |   |   |
| Other - Projects of $20 million or less each [Member]                                                                                                                           |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   | 26      |   |   |
| Cyprus Block 12 [Member]                                                                                                                                                        |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Farmdown                                                                                                                                                                        |                |           |    |   | $ (143) |   | $ (171) |
| Aging of Capitalized Exploratory Well Costs, Period One [Member] | Felicita/Yolanda Offshore Equatorial Guinea [Member]                                                         |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   |    | $ 45 |   |
| Aging of Capitalized Exploratory Well Costs, Period One [Member] | Yolanda Offshore Equatorial Guinea [Member]                                                                  |                |           |    |   |    |   |   |
| **Capitalized Exploratory Well Costs [Roll Forward]**                                                                                                                           |                |           |    |   |    |   |   |
| Exploratory Well Costs Capitalized for a Period Greater Than One Year Since Commencement of Drilling                                                                            |                |           |    |   |    | $ 22 |   |
|                                                                                                                                                                                 |
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| - Definition
Capitalized Exploratory Well Costs [Roll Forward]
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| - Definition
Capitalized Undeveloped Leasehold Cost
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| - Definition
Disposal Group, Not Discontinued Operation, Percentage Sold
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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
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| - 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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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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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| - 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
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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.
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| - Definition
Amount of expense related to estimated loss from loan and lease transactions.
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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.
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