| **Additional Financial Statement Information - Additional Balance Sheet Information (Details) - USD ($) $ in Millions** | Dec. 31, 2019 | Dec. 31, 2018 |
|-------------------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Accounts Receivable, Net**                                                                                            |          |          |
| Commodity Sales                                                                                                         | $ 446         | $ 383         |
| Joint Interest Billings                                                                                                 | 164           | 137           |
| Other                                                                                                                   | 128           | 111           |
| Allowance                                                                                                               | (8)           | (15)          |
| Total                                                                                                                   | 730           | 616           |
| **Other Current Assets**                                                                                                |          |          |
| Commodity Derivative Assets                                                                                             | 14            | 180           |
| Inventories, Materials and Supplies                                                                                     | 59            | 55            |
| Assets Held for Sale                                                                                                    | 14            | 133           |
| Prepaid Expenses and Other Current Assets                                                                               | 61            | 50            |
| Total                                                                                                                   | 148           | 418           |
| **Other Noncurrent Assets**                                                                                             |          |          |
| Total Equity Method Investments                                                                                         | 1,066         | 286           |
| Operating Lease Right-of-Use Assets                                                                                     | 227           |          |
| Customer-Related Intangible Assets, Net                                                                                 | 278           | 310           |
| Goodwill                                                                                                                | 110           | 110           |
| Mutual Fund Investments                                                                                                 | 27            | 38            |
| Other Noncurrent Assets                                                                                                 | 126           | 97            |
| Total                                                                                                                   | 1,834         | 841           |
| **Other Current Liabilities**                                                                                           |          |          |
| Production and Ad Valorem Taxes                                                                                         | 118           | 103           |
| Asset Retirement Obligations                                                                                            | 84            | 118           |
| Interest Payable                                                                                                        | 74            | 66            |
| Operating Lease Liabilities                                                                                             | 88            |          |
| Compensation and Benefits Payable                                                                                       | 126           | 83            |
| Other Current Liabilities                                                                                               | 229           | 149           |
| Total                                                                                                                   | 719           | 519           |
| **Other Noncurrent Liabilities**                                                                                        |          |          |
| Deferred Compensation Liabilities                                                                                       | 133           | 147           |
| Asset Retirement Obligations                                                                                            | 730           | 762           |
| Operating Lease Liabilities                                                                                             | 164           |          |
| Firm Transportation Exit Cost Accrual                                                                                   | 129           | 67            |
| Other Noncurrent Liabilities                                                                                            | 222           | 189           |
| Total                                                                                                                   | $ 1,378       | $ 1,165       |

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.
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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.
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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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Amount of allowance for credit loss on accounts receivable, classified as current.
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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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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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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 within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
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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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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.
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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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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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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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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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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.
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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.
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Amount of lessee's right to use underlying asset under operating lease.
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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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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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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.
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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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