| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Narrative (Details) $ in Millions**                  | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | $ 2,700        |
| Clayton Williams Energy                                                                                                     |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | 1,600          |
| Onshore US                                                                                                                  |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | 1,000          |
| 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                                                                                      | 135            |
| Held for Sale | Eagle Ford Shale [Member]                                                                                   |           |
| **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           |

| 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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