| **Clayton Williams Energy Acquisition (Details) $ / shares in Units, a in Thousands, shares in Millions, $ in Millions** |         | 3 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------|---------|----------------|
||
| **Business Acquisition [Line Items]**                                                                                    |    |           |
| Number of Wells Operated by Company | well                                                                               |    | 4              |
| Consideration                                                                                                            |    | $ 300          |
| Subsequent Event [Member]                                                                                                |    |           |
| **Business Acquisition [Line Items]**                                                                                    |    |           |
| Stock price ($ per share) | $ / shares                                                                                   | $ 34.17 |           |
| Subsequent Event [Member] | Clayton Williams Energy                                                                      |    |           |
| **Business Acquisition [Line Items]**                                                                                    |    |           |
| Area acquired (acres) | a                                                                                                | 118     |           |
| Shares exchange in acquisition (shares) | shares                                                                         | 55      |           |
| Consideration                                                                                                            | $ 1,900 |           |
| Cash consideration                                                                                                       | 665     |           |
| Consideration                                                                                                            | 2,600   |           |
| Credit facility draw                                                                                                     | $ 1,300 |           |

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Business Combination, Gas And Oil Area Acquired
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Number of Wells Operated by Company
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Number of shares of equity interests issued or issuable to acquire entity.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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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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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.
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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.
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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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| X                                                                                                                                                                                                                                                                     |
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Price of a single share of a number of saleable stocks of a company.
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