| **Additional Financial Statement Information (Details) - USD ($) $ in Millions** | 12 Months Ended |
|----------------------------------------------------------------------------------|-----------------|
||
| **Production Expense**                                                           |            |   |   |
| Lease Operating Expense                                                          | $ 563           | $ 593 | $ 524 |
| Production and Ad Valorem Taxes                                                  | 127             | 184 | 188 |
| Transportation Expense                                                           | 272             | 170 | 132 |
| Total                                                                            | 962             | 947 | 844 |
| **Other Operating Expense, Net**                                                 |            |   |   |
| Midstream Gathering and Processing (Income) Expense, Net                         | 9               | 11 | 6 |
| Corporate Restructuring Charges                                                  | 51              | 0 | 0 |
| Stacked Drilling Rig Expense                                                     | 30              | 0 | 0 |
| Pension Plan Expense                                                             | 88              | 0 | 0 |
| Rosetta Merger Expense                                                           | 81              | 0 | 0 |
| (Gain) Loss on Divestitures                                                      | 0               | (73) | (36) |
| Inventory Adjustment                                                             | 20              | 0 | 0 |
| Other, Net                                                                       | 37              | 38 | 43 |
| Total                                                                            | 316             | (24) | 13 |
| **Other Non-Operating (Income) Expense, Net**                                    |            |   |   |
| Deferred Compensation (Income) Expense                                           | (12)            | (25) | 26 |
| Other (Income) Expense, Net                                                      | (3)             | (1) | (5) |
| Total                                                                            | (15)            | (26) | 21 |
| **Accounts Receivable, Net**                                                     |            |   |   |
| Commodity Sales                                                                  | 298             | 405 |   |
| Joint Interest Billings                                                          | 20              | 297 |   |
| Other                                                                            | 151             | 171 |   |
| Allowance for Doubtful Accounts                                                  | (19)            | (16) |   |
| Total                                                                            | 450             | 857 |   |
| **Other Current Assets**                                                         |            |   |   |
| Inventories, Materials and Supplies                                              | 92              | 81 |   |
| Inventories, Crude Oil                                                           | 23              | 24 |   |
| Assets Held for Sale                                                             | 67              | 180 |   |
| Prepaid Expenses and Other Assets, Current                                       | 34              | 40 |   |
| Total                                                                            | 216             | 325 |   |
| **Other Noncurrent Assets**                                                      |            |   |   |
| Equity Method Investments                                                        | 453             | 325 | $ 437 |
| Mutual Fund Investments                                                          | 90              | 111 |   |
| Commodity Derivative Assets, Noncurrent                                          | 10              | 180 |   |
| Other Assets, Noncurrent                                                         | 67              | 64 |   |
| Total                                                                            | 620             | 680 |   |
| **Other Current Liabilities**                                                    |            |   |   |
| Production and Ad Valorem Taxes                                                  | 166             | 110 |   |
| Income Taxes Payable                                                             | 86              | 180 |   |
| Deferred Income Taxes, Current                                                   | 0               | 158 |   |
| Asset Retirement Obligations, Current                                            | 128             | 81 |   |
| Accrued Benefit Costs, Current                                                   | 3               | 125 |   |
| Interest Payable                                                                 | 83              | 70 |   |
| Current Portion of Capital Lease and Other Obligations                           | 53              | 68 |   |
| Other Liabilities, Current                                                       | 158             | 152 |   |
| Total                                                                            | 677             | 944 |   |
| **Other Noncurrent Liabilities**                                                 |            |   |   |
| Deferred Compensation Liabilities, Noncurrent                                    | 217             | 218 |   |
| Asset Retirement Obligations, Noncurrent                                         | 861             | 670 |   |
| Accrued Benefit Costs, Noncurrent                                                | 25              | 24 |   |
| Other Liabilities, Noncurrent                                                    | 116             | 175 |   |
| Total                                                                            | $ 1,219         | $ 1,087 |   |

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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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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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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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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. 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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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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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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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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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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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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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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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.
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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.
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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).
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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.
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Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or other income not separately disclosed.
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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.
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Fair value, after the effects of master netting arrangements, of a financial asset or other 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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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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.
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| - Definition
Facility expenses incurred related to gas and oil produced and sold during the reporting period.
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| - Definition
Amount of gain (loss) on sale or disposal of proven and unproven oil and gas properties.
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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.
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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).
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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.
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| - Definition
Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.
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| - Definition
Amount of lease operating expense related to property used in oil and gas production.
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| - Definition
Aggregated carrying amounts of obligations as of the balance sheet date, excluding long-term debt, incurred as part of the normal operations that are expected to be paid after one year or beyond the normal operating cycle, if longer. Alternate captions include Total Deferred Credits and Other Liabilities.
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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.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. 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
Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).
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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.
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| - Definition
Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
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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
Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered and of liabilities not separately disclosed.
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Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.
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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
Carrying amounts due as of the balance sheet date from parties or arising from transactions not otherwise specified in the taxonomy.
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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
Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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