| **Additional Financial Statement Information - Additional Balance Sheet Information (Details) - USD ($) $ in Millions** | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 |
|-------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|
| **Accounts Receivable, Net**                                                                                            |          |          |          |
| Commodity Sales                                                                                                         | $ 383         | $ 455         |          |
| Joint Interest Billings                                                                                                 | 137           | 207           |          |
| Other                                                                                                                   | 111           | 103           |          |
| Allowance for Doubtful Accounts                                                                                         | (15)          | (17)          |          |
| Total                                                                                                                   | 616           | 748           |          |
| **Other Current Assets**                                                                                                |          |          |          |
| Commodity Derivative Assets                                                                                             | 180           | 0             |          |
| Inventories, Materials and Supplies                                                                                     | 55            | 66            |          |
| Inventories, Crude Oil                                                                                                  | 12            | 16            |          |
| Assets Held for Sale                                                                                                    | 133           | 629           |          |
| Restricted Cash                                                                                                         | 3             | 38            | $ 30          |
| Prepaid Expenses and Other Assets, Current                                                                              | 35            | 31            |          |
| Total                                                                                                                   | 418           | 780           |          |
| **Other Noncurrent Assets**                                                                                             |          |          |          |
| Equity Method Investments                                                                                               | 286           | 305           |          |
| Customer-Related Intangible Assets, Net                                                                                 | 310           | 0             |          |
| Mutual Fund Investments                                                                                                 | 38            | 57            |          |
| Net Deferred Income Tax Asset                                                                                           | 21            | 25            |          |
| Other Assets, Noncurrent                                                                                                | 76            | 74            |          |
| Total                                                                                                                   | 731           | 461           |          |
| **Other Current Liabilities**                                                                                           |          |          |          |
| Production and Ad Valorem Taxes                                                                                         | 103           | 84            |          |
| Commodity Derivative Liabilities                                                                                        | 1             | 58            |          |
| Income Taxes Payable                                                                                                    | 22            | 18            |          |
| Asset Retirement Obligations                                                                                            | 118           | 51            |          |
| Interest Payable                                                                                                        | 66            | 67            |          |
| Current Portion of Capital Lease Obligations                                                                            | 41            | 61            |          |
| Liabilities Associated with Assets Held for Sale                                                                        | 1             | 55            |          |
| Compensation and Benefits Payable                                                                                       | 83            | 98            |          |
| Other Liabilities, Current                                                                                              | 84            | 86            |          |
| Total                                                                                                                   | 519           | 578           |          |
| **Other Noncurrent Liabilities**                                                                                        |          |          |          |
| Deferred Compensation Liabilities                                                                                       | 147           | 197           |          |
| Asset Retirement Obligations                                                                                            | 762           | 824           |          |
| Marcellus Shale Exit Cost Accrual                                                                                       | 67            | 76            |          |
| Production and Ad Valorem Taxes                                                                                         | 83            | 69            |          |
| Commodity Derivative Liabilities                                                                                        | 26            | 15            |          |
| Other Liabilities, Noncurrent                                                                                           | 80            | 64            |          |
| Total                                                                                                                   | $ 1,165       | $ 1,245       |          |
| Tamar and Dalit Fields                                                                                                  |          |          |          |
| **Other Noncurrent Liabilities**                                                                                        |          |          |          |
| Ownership interest                                                                                                      | 7.50%         |          |          |

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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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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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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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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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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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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).
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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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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.
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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
Amount classified as liabilities attributable to disposal group held for sale or disposed of.
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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
Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.
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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.
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| - Definition
Amount of current assets classified as other.
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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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Amount of noncurrent assets classified as other.
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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.
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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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| - 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.
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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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