| **Clayton Williams Energy Acquisition - Purchase Price Allocation (Details) - USD ($) $ in Millions** |         | 12 Months Ended |
|-------------------------------------------------------------------------------------------------------|---------|-----------------|
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| **Business Acquisition [Line Items]**                                                                 |    |            |   |   |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                 |    | $ 616           | $ 0 | $ 0 |
| Clayton Williams Energy                                                                               |    |            |   |   |
| **Business Acquisition [Line Items]**                                                                 |    |            |   |   |
| Fair value of common stock issued                                                                     | $ 1,876 |            |   |   |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                 | 637     |            |   |   |
| Total purchase price                                                                                  | 2,513   |            |   |   |
| Accounts Payable                                                                                      | 99      |            |   |   |
| Other Current Liabilities                                                                             | 38      |            |   |   |
| Long-Term Deferred Tax Liability                                                                      | 509     |            |   |   |
| Long-Term Debt                                                                                        | 595     |            |   |   |
| Asset Retirement Obligation                                                                           | 63      |            |   |   |
| Total purchase price plus liabilities assumed                                                         | $ 3,817 |            |   |   |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Asset Retirement Obligations
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| - Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.
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| - Definition
Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.
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| - Definition
Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.
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Amount of other liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.
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| - Definition
Amount of deferred tax liability attributable to taxable temporary difference assumed at the acquisition date that are classified as noncurrent.
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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.
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