| **Basis of Presentation - Statements of Operations Information (Details) - USD ($) $ in Millions** | 3 Months Ended | 9 Months Ended |
|----------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Production Expense**                                                                             |           |           |   |   |
| Lease Operating Expense                                                                            | $ 124          | $ 151          | $ 411 | $ 414 |
| Production and Ad Valorem Taxes                                                                    | 47             | 31             | 151 | 104 |
| Gathering, Transportation and Processing Expense                                                   | 97             | 93             | 292 | 333 |
| Total                                                                                              | 273            | 280            | 886 | 866 |
| **Exploration Expense**                                                                            |           |           |   |   |
| Leasehold Impairment and Amortization                                                              | 0              | 33             | 0 | 51 |
| Seismic, Geological and Geophysical                                                                | 4              | 7              | 17 | 20 |
| Staff Expense                                                                                      | 14             | 11             | 41 | 40 |
| Other                                                                                              | 7              | 13             | 31 | 25 |
| Total                                                                                              | 25             | 64             | 89 | 136 |
| **Other Operating Expense (Income), Net**                                                          |           |           |   |   |
| Marketing Expense                                                                                  | 11             | 6              | 21 | 39 |
| Purchased Oil and Gas                                                                              | 76             | 0              | 204 | 0 |
| Clayton Williams Energy Acquisition Expenses                                                       | 0              | 4              | 0 | 98 |
| Gain on Asset Retirement Obligation Revisions                                                      | (10)           | (42)           | (21) | (42) |
| Other, Net                                                                                         | 1              | 17             | 18 | 37 |
| Total                                                                                              | 78             | (15)           | 222 | 132 |
| **Other Non-Operating (Income) Expense, Net**                                                      |           |           |   |   |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                          | (32)           | 0              | (6) | 0 |
| Other, Net                                                                                         | (2)            | 2              | (1) | (4) |
| Loss (Gain) on Extinguishment of Debt, Net                                                         | 0              | 98             | (3) | 98 |
| Total                                                                                              | (34)           | 100            | (10) | 94 |
| Dividend income                                                                                    | 17             |           | 31 |   |
| Other Royalty Expense                                                                              |           |           |   |   |
| **Production Expense**                                                                             |           |           |   |   |
| Other Royalty Expense                                                                              | 5              | 5              | 32 | 15 |
| Total                                                                                              |           |           |   |   |
| **Sales of Purchased Oil and Gas and Other**                                                       |           |           |   |   |
| Revenue from Sales                                                                                 | 137            | 53             | 380 | 137 |
| Sales of Purchased Oil and Gas                                                                     |           |           |   |   |
| **Sales of Purchased Oil and Gas and Other**                                                       |           |           |   |   |
| Revenue from Sales                                                                                 | 72             | 0              | 191 | 0 |
| Income from Equity Method Investees                                                                |           |           |   |   |
| **Sales of Purchased Oil and Gas and Other**                                                       |           |           |   |   |
| Revenue from Sales                                                                                 | 44             | 46             | 140 | 125 |
| Midstream Services Revenues – Third Party                                                    |           |           |   |   |
| **Sales of Purchased Oil and Gas and Other**                                                       |           |           |   |   |
| Revenue from Sales                                                                                 | $ 21           | $ 7            | $ 49 | $ 12 |

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Exploration Costs, Leasehold Impairment and Amortization 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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Operating Income (Expense), Other
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Other Other Nonoperating Income (Expense)
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| - Definition
This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.
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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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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
Amount of operating dividend income on securities.
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| - Definition
Amount of any recovery from third parties that is credited to environmental remediation costs.
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| - Definition
Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).
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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
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
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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
Amount of operating lease expense. Excludes sublease income.
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| - Definition
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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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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