| **Basis of Presentation - Statements of Operations Information (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|----------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Income From Equity Method Investees and Other**                                                  |           |           |   |
| Income from Equity Method Investees                                                                | $ 47           |           | $ 42 |
| Sales of Purchased Oil and Gas                                                                     | 53             |           | 0 |
| Midstream Services Revenues – Third Party                                                    | 13             |           | 0 |
| Total                                                                                              | 113            | $ 42           | $ 42 |
| **Production Expense**                                                                             |           |           |   |
| Lease Operating Expense                                                                            | 155            | 139            |   |
| Production and Ad Valorem Taxes                                                                    | 54             | 41             |   |
| Gathering, Transportation and Processing Expense                                                   | 95             | 119            |   |
| Other Royalty Expense                                                                              | 17             | 4              |   |
| Total                                                                                              | 321            | 303            |   |
| **Exploration Expense**                                                                            |           |           |   |
| Leasehold Impairment and Amortization                                                              | 0              | 18             |   |
| Seismic, Geological and Geophysical                                                                | 11             | 5              |   |
| Staff Expense                                                                                      | 14             | 13             |   |
| Other                                                                                              | 10             | 6              |   |
| Total                                                                                              | 35             | 42             |   |
| **Other Operating Expense, Net**                                                                   |           |           |   |
| Marketing Expense                                                                                  | 5              | 19             |   |
| Purchased Oil and Gas                                                                              | 57             | 0              |   |
| Other, Net                                                                                         | (8)            | (10)           |   |
| Total                                                                                              | 70             | 29             |   |
| **Other Non-Operating Expense (Income), Net**                                                      |           |           |   |
| Loss on Investment in Tamar Petroleum Ltd., Net                                                    | 15             | 0              |   |
| Other                                                                                              | (2)            | (1)            |   |
| Total                                                                                              | 13             | $ (1)          |   |
| Loss from change in fair value                                                                     | 29             |           |   |
| Dividend income                                                                                    | 14             |           |   |
| Saddle Butte                                                                                       |           |           |   |
| **Other Operating Expense, Net**                                                                   |           |           |   |
| Purchased Oil and Gas                                                                              | $ 5            |           |   |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Exploration Costs, Leasehold Impairment and Amortization Expense
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Exploration Costs, Other Expense
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Exploration Costs, Seismic, Geological and Geophysical Expense
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Exploration Costs, Wage Expense
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Exploration Expense [Abstract]
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Income From Equity Method Investee Other [Abstract]
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Income (Loss) From Equity Method Investments And Other
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Other Other Nonoperating Income (Expense)
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| - Definition
This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.
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| - Definition
Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.
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| - Definition
Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.
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| - Definition
Royalty expense incurred and are directly related to goods produced and sold and services rendered during the reporting period.
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| - Definition
Amount of operating dividend income on securities.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) reported by an equity method investment of the entity.
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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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| - Definition
Amount of lease operating expense related to property used in oil and gas production.
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| - Definition
Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.
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| - Definition
Aggregate revenue during the period related to oil and gas business activities.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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Amount of income (expense) related to nonoperating activities, classified as other.
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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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| - Definition
Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
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| - Definition
Revenue derived from sale of oil and gas exploratory and developmental prospects.
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