| **Basis of Presentation (Details) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 3 Months Ended |     |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----|
||
| **Production Expense**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |           |     |   |  |   |  |
| Lease Operating Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | $ 117          |     | $ 105 |  |   |  |
| Production Tax Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             | 43             |     | 38 |  |   |  |
| Transportation and Gathering Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 27             |     | 20 |  |   |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 187            |     | 163 |  |   |  |
| **Other Operating (Income) Expense, Net**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           |     |   |  |   |  |
| Gain on Divestitures                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | (15)           | [1] | 0 | [1] |   |  |
| Other, Net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 7              |     | 12 |  |   |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | (8)            |     | 12 |  |   |  |
| **Other Non-Operating (Income) Expense, Net**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |     |   |  |   |  |
| Deferred Compensation Expense                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      | 10             | [2] | 3 | [2] |   |  |
| Other (Income) Expense, Net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 0              |     | (4) |  |   |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 10             |     | (1) |  |   |  |
| **Accounts Receivable, Net**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |           |     |   |  |   |  |
| Commodity Sales                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 266            |     |   |  | 349 |  |
| Joint Interest Billings                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 395            |     |   |  | 486 |  |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 125            |     |   |  | 139 |  |
| Allowance for Doubtful Accounts                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | (10)           |     |   |  | (10) |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 776            |     |   |  | 964 |  |
| **Other Current Assets**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |           |     |   |  |   |  |
| Inventories, Current                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 97             |     |   |  | 90 |  |
| Commodity Derivative Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 36             |     |   |  | 63 |  |
| Deferred Income Taxes, Net                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 83             |     |   |  | 106 |  |
| Probable Insurance Claims                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 17             | [3] |   |  | 45 | [3] |
| Assets Held-for-Sale                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 63             | [4] |   |  | 45 | [4] |
| Prepaid Expenses and Other Current Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 74             |     |   |  | 71 |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 370            |     |   |  | 420 |  |
| **Other Noncurrent Assets**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |           |     |   |  |   |  |
| Equity Method Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          | 423            |     |   |  | 367 |  |
| Mutual Fund Investments                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            | 109            |     |   |  | 103 |  |
| Commodity Derivative Assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        | 13             |     |   |  | 21 |  |
| Other Assets, Noncurrent                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 87             |     |   |  | 106 |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 632            |     |   |  | 597 |  |
| **Other Current Liabilities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           |     |   |  |   |  |
| Production and Ad Valorem Taxes                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    | 107            |     |   |  | 113 |  |
| Commodity Derivative Liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 44             |     |   |  | 7 |  |
| Income Taxes Payable                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               | 202            |     |   |  | 203 |  |
| Asset Retirement Obligations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 69             |     |   |  | 69 |  |
| Interest Payable                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 40             |     |   |  | 55 |  |
| CONSOL Installment Payment                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | 325            | [5] |   |  | 324 | [5] |
| Current Portion of FPSO Lease Obligation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           | 49             |     |   |  | 48 |  |
| Liabilities Associated with Assets Held for Sale                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 14             | [4] |   |  | 12 | [4] |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 136            |     |   |  | 193 |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 986            |     |   |  | 1,024 |  |
| **Other Noncurrent Liabilities**                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |           |     |   |  |   |  |
| Deferred Compensation Liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | 247            |     |   |  | 229 |  |
| Asset Retirement Obligations                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       | 330            |     |   |  | 333 |  |
| Accrued Benefit Costs                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 118            |     |   |  | 116 |  |
| Commodity Derivative Liabilities                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | 9              |     |   |  | 3 |  |
| Other                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | 146            |     |   |  | 129 |  |
| Total                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | $ 850          |     |   |  | $ 810 |  |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| [1]See Note 3. Divestitures[2]Amounts represent increases in the fair value of shares of our common stock held in a rabbi trust.[3]Amounts represent the costs incurred to date of the Leviathan-2 appraisal well and expected well abandonment costs in excess of the insurance deductible less insurance proceeds received to date.[4]Assets held for sale consist primarily of North Sea and onshore US oil and gas properties. Liabilities associated with assets held for sale consist primarily of asset retirement obligations related to these assets.[5]See Note 5. Debt. |

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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 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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Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.
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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.
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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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| - Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.
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| - Definition
This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.
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| - Definition
Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
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| - Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments which are expected to exist longer than one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.
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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
Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties.
+ References
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| - Definition
Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.
+ References
No definition available.
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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 (lower of cost or market) as of the balance sheet date of inventories less all valuation and other allowances. Excludes noncurrent inventory balances (expected to remain on hand past one year or one operating cycle, if longer).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Lease expense related to property used in oil and gas production.
+ References
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| - Definition
The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).
+ References
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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.
+ References
No definition available.
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| - Definition
Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.
+ 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
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).
+ References
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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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| - Definition
Carrying amount as of the balance sheet date of noncurrent assets which have not been itemized or categorized in the footnotes to the financial statements and are a component of Other Assets, Noncurrent (OtherAssetsNoncurrent). Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
+ References
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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).
+ References
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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.
+ References
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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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| - Definition
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).
+ References
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| - Definition
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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| - 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.
+ References
No definition available.
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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
The total of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer, and the aggregate carrying amount of current assets, as of the balance sheet date, not separately presented elsewhere in the balance sheet. Current assets 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.
+ References
No definition available.
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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.
+ References
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