| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Narrative (Details) - USD ($) $ in Millions**        | 3 Months Ended | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | $ 2,600        |
| Onshore US                                                                                                                  |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | 2,400          |
| Eagle Ford                                                                                                                  |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | 129            |
| Other Int'l                                                                                                                 |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | 53             |
| Held for Sale | Delaware Basin                                                                                              |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | 259            |
| Held for Sale | Eagle Ford Shale                                                                                            |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      |           | $ 20           |
| Held for Sale | Gulf of Mexico                                                                                              |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      | $ 43           |           |
| Held for Sale | Other US Onshore Properties                                                                                 |           |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |           |
| Capitalized undeveloped leasehold cost                                                                                      | $ 36           |           |

| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Undeveloped Leasehold Cost
+ 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.
+ References
No definition available.
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| X                                                                                                                                              |
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| X                                                                                                                                            |
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| X                                                                                                                                                        |
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