| **Clayton Williams Energy Acquisition (Details) $ / shares in Units, shares in Thousands, a in Thousands, $ in Millions** |         | 3 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended |         |
|---------------------------------------------------------------------------------------------------------------------------|---------|----------------|----------------|----------------|----------------|---------|
||
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Proved undeveloped reserves (MMBOEs) | MMBoe                                                                              |    |           | 551            |           |           | 551     |   |   |   |
| Cash consideration                                                                                                        |    |           |           |           |           |    | $ 616 | $ 0 |   |
| Acquisition related costs                                                                                                 |    | $ 4            |           | $ 0            |           |    | 98 | $ 0 |   |
| Goodwill                                                                                                                  |    | 1,295          |           |           | $ 1,295        |    | 1,295 |   | $ 0 |
| Clayton Williams Energy                                                                                                   |    |           |           |           |           |    |   |   |   |
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Area acquired (acres) | a                                                                                                 | 118     |           |           |           |           |    |   |   |   |
| Shares exchange in acquisition (shares) | shares                                                                          | 56,000  |           |           |           |           |    |   |   |   |
| Equity consideration                                                                                                      | $ 1,876 |           |           |           |           |    |   |   |   |
| Cash consideration                                                                                                        | 637     |           |           |           |           |    |   |   |   |
| Consideration                                                                                                             | $ 2,513 |           |           |           |           |    |   |   |   |
| Stock price ($ per share) | $ / shares                                                                                    | $ 34.17 |           |           |           |           |    |   |   |   |
| Credit facility draw                                                                                                      |    |           | $ 1,300        |           |           | $ 1,300 |   |   |   |
| Acquisition related costs                                                                                                 |    |           | $ 23           |           |           |    | 64 |   |   |
| Noncash share compensation                                                                                                |    |           |           |           |           |    | $ 34 |   |   |
| Treasury shares received in acquisition | shares                                                                          |    |           |           |           |           |    | 720 |   |   |
| Increase to treasury stock                                                                                                |    |           |           |           |           |    | $ 25 |   |   |
| Debt assumed                                                                                                              | $ 595   |           |           |           |           |    |   |   |   |
| Goodwill                                                                                                                  | $ 1,295 | 1,300          |           |           | 1,300          |    | 1,300 |   |   |
| Pro forma revenue                                                                                                         |    |           |           |           | 56             |    |   |   |   |
| Pro forma loss                                                                                                            |    |           |           |           | $ 14           |    |   |   |   |
| Clayton Williams Energy                                                                                                   |    |           |           |           |           |    |   |   |   |
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Acquisition related costs                                                                                                 |    | $ 4            |           |           |           |    | $ 98 |   |   |
| Tax rate                                                                                                                  |    | 35.00%         |           |           |           |    |   |   |   |
| Delaware Basin | Clayton Williams Energy                                                                                  |    |           |           |           |           |    |   |   |   |
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Area acquired (acres) | a                                                                                                 | 71      |           |           |           |           |    |   |   |   |
| Increase (MMBOEs) | MMBoe                                                                                                 |    |           |           |           |           | 86      |   |   |   |
| Proved developed reserves (MMBOEs) | MMBoe                                                                                |    |           | 17             |           |           | 17      |   |   |   |
| Proved undeveloped reserves (MMBOEs) | MMBoe                                                                              |    |           | 69             |           |           | 69      |   |   |   |
| Permian | Clayton Williams Energy                                                                                         |    |           |           |           |           |    |   |   |   |
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Area acquired (acres) | a                                                                                                 | 100     |           |           |           |           |    |   |   |   |
| TEXAS | Clayton Williams Energy                                                                                           |    |           |           |           |           |    |   |   |   |
| **Business Acquisition [Line Items]**                                                                                     |    |           |           |           |           |    |   |   |   |
| Area acquired (acres) | a                                                                                                 |    |           |           |           |           |    | 64 |   |   |

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Number of shares of equity interests issued or issuable to acquire entity.
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| - Definition
This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.
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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
This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
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| - Definition
This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.
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| - Definition
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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| - Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
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| - Definition
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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| - Definition
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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| - Definition
Energy measure of increase (decrease) of quantity of proved reserve of oil and gas, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).
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| - Definition
Energy measure of interests in proved developed reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.
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Energy measure of proved undeveloped reserves of crude oil, including condensate and natural gas liquids, natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas.
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Price of a single share of a number of saleable stocks of a company.
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