| **Basis of Presentation (Details) $ in Millions**                                               |        | 3 Months Ended | 6 Months Ended | 9 Months Ended |        |         |
|-------------------------------------------------------------------------------------------------|--------|----------------|----------------|----------------|--------|---------|
||
| Goodwill                                                                                        |   | $ 1,295        |           |           |   | $ 1,295 |   |   | $ 0 |
| Proved undeveloped reserves (MMBOEs) | MMBoe                                                    | 551    |           | 551            |           | 551    |    |   |   |   |
| **Production Expense**                                                                          |   |           |           |           |   |    |   |   |   |
| Lease Operating Expense                                                                         |   | 151            |           | $ 131          |   | 414     | $ 412 |   |   |
| Production and Ad Valorem Taxes                                                                 |   | 36             |           | 30             |   | 119     | 73 |   |   |
| Gathering, Transportation and Processing Expense                                                |   | 93             |           | 121            |   | 333     | 354 |   |   |
| Total                                                                                           |   | 280            |           | 282            |   | 866     | 839 |   |   |
| **Exploration Expense**                                                                         |   |           |           |           |   |    |   |   |   |
| Leasehold Impairment and Amortization                                                           |   | 33             |           | 96             |   | 51      | 127 |   |   |
| Dry Hole Cost                                                                                   |   | 2              |           | 5              |   | 2       | 105 |   |   |
| Seismic, Geological and Geophysical                                                             |   | 7              |           | 15             |   | 20      | 47 |   |   |
| Staff Expense                                                                                   |   | 11             |           | 15             |   | 40      | 53 |   |   |
| Other                                                                                           |   | 11             |           | (6)            |   | 23      | 44 |   |   |
| Total                                                                                           |   | 64             |           | 125            |   | 136     | 376 |   |   |
| Loss on Sale                                                                                    |   | 0              |           | 0              |   | 2,270   | 0 |   |   |
| Firm transportation liability                                                                   |   | 0              |           | 0              |   | 41      | 0 |   |   |
| Other                                                                                           |   | 4              |           | 0              |   | 15      | 0 |   |   |
| Total                                                                                           |   | 4              |           | 0              |   | 2,326   | 0 |   |   |
| **Other Operating Expense, Net (7)**                                                            |   |           |           |           |   |    |   |   |   |
| Marketing Expense                                                                               |   | 6              |           | 12             |   | 39      | 39 |   |   |
| Clayton Williams Energy Acquisition Expenses                                                    |   | 4              |           | 0              |   | 98      | 0 |   |   |
| Loss on Asset Due to Terminated Contract                                                        |   | 0              |           | 0              |   | 0       | 47 |   |   |
| North Sea Remediation Project Revision                                                          |   | (42)           |           | 0              |   | (42)    | 0 |   |   |
| Other, Net                                                                                      |   | 17             |           | 25             |   | 37      | 41 |   |   |
| Total                                                                                           |   | (15)           |           | 37             |   | 132     | 127 |   |   |
| Gathering, Transportation and Processing Expense                                                |   | 93             |           | 121            |   | 333     | 354 |   |   |
| **Accounts Receivable, Net**                                                                    |   |           |           |           |   |    |   |   |   |
| Commodity Sales                                                                                 |   | 403            |           |           |   | 403     |   |   | 403 |
| Joint Interest Billings                                                                         |   | 183            |           |           |   | 183     |   |   | 106 |
| Proceeds Receivable                                                                             |   | 0              |           |           |   | 0       |   |   | 40 |
| Other                                                                                           |   | 106            |           |           |   | 106     |   |   | 86 |
| Allowance for Doubtful Accounts                                                                 |   | (17)           |           |           |   | (17)    |   |   | (20) |
| Total                                                                                           |   | 675            |           |           |   | 675     |   |   | 615 |
| **Other Current Assets**                                                                        |   |           |           |           |   |    |   |   |   |
| Inventories, Materials and Supplies                                                             |   | 61             |           |           |   | 61      |   |   | 71 |
| Inventories, Crude Oil                                                                          |   | 17             |           |           |   | 17      |   |   | 18 |
| Assets Held for Sale                                                                            |   | 180            |           |           |   | 180     |   |   | 18 |
| Restricted Cash                                                                                 |   | 0              |           |           |   | 0       |   |   | 30 |
| Prepaid Expenses and Other Current Assets                                                       |   | 45             |           |           |   | 45      |   |   | 23 |
| Total                                                                                           |   | 303            |           |           |   | 303     |   |   | 160 |
| **Other Noncurrent Assets**                                                                     |   |           |           |           |   |    |   |   |   |
| Equity Method Investments                                                                       |   | 286            |           |           |   | 286     |   |   | 400 |
| Mutual Fund Investments                                                                         |   | 70             |           |           |   | 70      |   |   | 71 |
| Other Assets, Noncurrent                                                                        |   | 60             |           |           |   | 60      |   |   | 37 |
| Total                                                                                           |   | 416            |           |           |   | 416     |   |   | 508 |
| **Other Current Liabilities**                                                                   |   |           |           |           |   |    |   |   |   |
| Production and Ad Valorem Taxes                                                                 |   | 118            |           |           |   | 118     |   |   | 115 |
| Commodity Derivative Liabilities                                                                |   | 4              |           |           |   | 4       |   |   | 102 |
| Income Taxes Payable                                                                            |   | 13             |           |           |   | 13      |   |   | 53 |
| Asset Retirement Obligations                                                                    |   | 50             |           |           |   | 50      |   |   | 160 |
| Interest Payable                                                                                |   | 82             |           |           |   | 82      |   |   | 76 |
| Current Portion of Capital Lease Obligations                                                    |   | 65             |           |           |   | 65      |   |   | 63 |
| Foreign Sales Tax Payable                                                                       |   | 29             |           |           |   | 29      |   |   | 14 |
| Compensation and Benefits Payable                                                               |   | 87             |           |           |   | 87      |   |   | 110 |
| Theoretical Withdrawal Premium                                                                  |   | 25             |           |           |   | 25      |   |   | 18 |
| Other Liabilities, Current                                                                      |   | 26             |           |           |   | 26      |   |   | 31 |
| Total                                                                                           |   | 499            |           |           |   | 499     |   |   | 742 |
| **Other Noncurrent Liabilities**                                                                |   |           |           |           |   |    |   |   |   |
| Deferred Compensation Liabilities                                                               |   | 216            |           |           |   | 216     |   |   | 218 |
| Asset Retirement Obligations                                                                    |   | 894            |           |           |   | 894     |   |   | 775 |
| Marcellus Shale Firm Transportation Commitment                                                  |   | 31             |           |           |   | 31      |   |   | 0 |
| Production and Ad Valorem Taxes                                                                 |   | 49             |           |           |   | 49      |   |   | 47 |
| Other Liabilities, Noncurrent                                                                   |   | 55             |           |           |   | 55      |   |   | 63 |
| Total                                                                                           |   | 1,245          |           |           |   | 1,245   |   |   | $ 1,103 |
| Percentage of divestiture farmed out                                                            |   |           |           |           |   |    |   |   | 35.00% |
| Firm transportation liability                                                                   |   | $ 39           |           |           |   | 39      |   |   |   |
| Leviathan                                                                                       |   |           |           |           |   |    |   |   |   |
| Proved undeveloped reserves (MMBOEs) | MMBoe                                                    | 551    |           | 551            |           | 551    |    |   |   |   |
| Tamar Field                                                                                     |   |           |           |           |   |    |   |   |   |
| Increase (decrease) in net proved reserves (MMBOEs) | MMBoe                                     |   | 48             |           |           |   |    |   |   |   |
| Marcellus Shale                                                                                 |   |           |           |           |   |    |   |   |   |
| Proved developed and undeveloped reserves, decreased reserves from divestiture (MMBOEs) | MMBoe | 241    |           |           |           |   |    |   |   |   |
| Decrease in proved developed reserves (MMBOEs) | MMBoe                                          | 190    |           |           |           |   |    |   |   |   |
| Decrease in undeveloped reserves (MMBOEs) | MMBoe                                               | 51     |           |           |           |   |    |   |   |   |
| Clayton Williams Energy                                                                         |   |           |           |           |   |    |   |   |   |
| Goodwill                                                                                        |   | $ 1,300        |           |           |   | 1,300   |   | $ 1,295 |   |
| **Other Operating Expense, Net (7)**                                                            |   |           |           |           |   |    |   |   |   |
| Clayton Williams Energy Acquisition Expenses                                                    |   |           | $ 23           |           |   | 64      |   |   |   |
| Clayton Williams Energy | Delaware Basin                                                        |   |           |           |           |   |    |   |   |   |
| Increase (decrease) in net proved reserves (MMBOEs) | MMBoe                                     |   |           |           |           | 86     |    |   |   |   |
| Proved developed reserves (MMBOEs) | MMBoe                                                      | 17     |           | 17             |           | 17     |    |   |   |   |
| Proved undeveloped reserves (MMBOEs) | MMBoe                                                    | 69     |           | 69             |           | 69     |    |   |   |   |
| Scenario, Previously Reported                                                                   |   |           |           |           |   |    |   |   |   |
| **Other Operating Expense, Net (7)**                                                            |   |           |           |           |   |    |   |   |   |
| Gathering, Transportation and Processing Expense                                                |   | 12             |           | $ 8            |   | 17      | $ 19 |   |   |
| Other Current Liabilities                                                                       |   |           |           |           |   |    |   |   |   |
| **Other Noncurrent Liabilities**                                                                |   |           |           |           |   |    |   |   |   |
| Firm transportation liability                                                                   |   | $ 8            |           |           |   | $ 8     |   |   |   |
| Texas Reporting Unit                                                                            |   |           |           |           |   |    |   |   |   |
| Percentage of fair value in excess of carrying amount                                           |   | 6.00%          |           |           |   | 6.00%   |   |   |   |

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Firm Transportation Liability, Noncurrent
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Amount, after allowance, receivable from customers, clients, or other third-parties, and receivables classified as other due within one year or the normal operating cycle, if longer.
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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.
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| - Definition
Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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| - Definition
Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.
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| - Definition
Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.
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| - Definition
A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.
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| - Definition
Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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| - Definition
Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.
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| - Definition
Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.
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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.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
+ References
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| - Definition
The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.
+ References
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| - Definition
Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).
+ References
No definition available.
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| - Definition
Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Amount of any recovery from third parties that is credited to environmental remediation costs.
+ References
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| - Definition
This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.
+ References
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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.
+ References
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| - Definition
Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.
+ References
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| - Definition
Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
+ References
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| - Definition
Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.
+ References
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| - Definition
Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.
+ References
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| - Definition
Amount of lease operating expense related to property used in oil and gas production.
+ References
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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.
+ References
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| - Definition
Current portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells.  For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount of expenses incurred but not yet paid classified as other, due after one year or the normal operating cycle, if longer.
+ References
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| - Definition
Amount of current assets classified as other.
+ References
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| - Definition
Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.
+ References
No definition available.
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| - Definition
Amount of noncurrent assets classified as other.
+ References
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| - References
No definition available.
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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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| - Definition
Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.
+ References
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| - References
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| - Definition
Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.
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| - References
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| - Definition
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
Amount due from parties in nontrade transactions, classified as other.
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| - Definition
Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
+ References
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| - Definition
A tax assessed on oil and gas production.
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| - Definition
Energy measure of increase (decrease) of quantity of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).
+ References
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| - Definition
Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.
+ References
No definition available.
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Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.
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| - Definition
Percentage of fair value of reporting unit in excess of carrying amount.
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No definition available.
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| - Definition
Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.
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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.
+ References
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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
Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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