| **Basis of Presentation - Statements of Operations Information (Details) - USD ($) $ in Millions** | 3 Months Ended |
|----------------------------------------------------------------------------------------------------|----------------|
||
| **Other Revenue**                                                                                  |           |   |
| Revenue from Sales                                                                                 | $ 1,052        | $ 1,286 |
| **Production Expense**                                                                             |           |   |
| Lease Operating Expense                                                                            | 151            | 155 |
| Production and Ad Valorem Taxes                                                                    | 49             | 54 |
| Gathering, Transportation and Processing Expense                                                   | 102            | 93 |
| Total                                                                                              | 305            | 319 |
| **Other Operating Expense, Net**                                                                   |           |   |
| Exploration Expense                                                                                | 24             | 35 |
| Other, Net                                                                                         | 25             | 15 |
| Total                                                                                              | 49             | 50 |
| Other Revenue                                                                                      |           |   |
| **Other Revenue**                                                                                  |           |   |
| Revenue from Sales                                                                                 | 41             | 60 |
| Income from Equity Method Investees                                                                |           |   |
| **Other Revenue**                                                                                  |           |   |
| Revenue from Sales                                                                                 | 17             | 47 |
| Midstream Services Revenues – Third Party                                                    |           |   |
| **Other Revenue**                                                                                  |           |   |
| Revenue from Sales                                                                                 | 24             | 13 |
| Other Royalty Expense                                                                              |           |   |
| **Production Expense**                                                                             |           |   |
| Costs and Expenses                                                                                 | $ 3            | $ 17 |

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Income From Equity Method Investee Other [Abstract]
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Operating Income (Expense), Other
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| - Definition
The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.
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Amount of operating lease expense. Excludes sublease income.
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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.
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| - Definition
A tax assessed on oil and gas production.
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| - Definition
Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
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Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
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| - Definition
Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.
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