| **Rosetta Merger - Narrative (Details) $ / shares in Units, a in Thousands, shares in Millions, $ in Millions**                                      |     | 2 Months Ended | 3 Months Ended | 9 Months Ended |
|------------------------------------------------------------------------------------------------------------------------------------------------------|-----|----------------|----------------|----------------|
||
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Shares exchange in acquisition | shares                                                                                                              |     | 41             |           |           |   |   |   |
| Rosetta Merger Expenses                                                                                                                              | [1] |           |           | $ 71           | $ 0 | $ 73 | $ 0 |
| Pro forma revenue                                                                                                                                    |     |           | $ 81           |           |   |   |   |
| Pro forma pre-tax net income                                                                                                                         |     |           | $ 43           |           |   |   |   |
| Rosetta Resources, Inc [Member]                                                                                                                      |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Shares exchange in acquisition | shares                                                                                                              |     | 41             |           |           |   |   |   |
| Number of onshore plays added in acquisition | business                                                                                              |     | 2              |           |           |   |   |   |
| Merger related costs including noncash share-based compensation expense                                                                              |     |           |           | 71             |   | 73 |   |
| Rosetta Merger Expenses                                                                                                                              |     |           |           |           |   | 58 |   |
| Merger related costs related to noncash share-based compensation                                                                                     |     |           |           |           |   | 15 |   |
| Share price | $ / shares                                                                                                                             |     | $ 36.97        |           |           |   |   |   |
| Eagle Ford Shale [Member] | Rosetta Resources, Inc [Member]                                                                                          |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Liquid rich asset based acquired | a                                                                                                                 |     | 50             |           |           |   |   |   |
| Permian [Member] | Rosetta Resources, Inc [Member]                                                                                                   |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Liquid rich asset based acquired | a                                                                                                                 |     | 54             |           |           |   |   |   |
| Delaware Basin [Member] | Rosetta Resources, Inc [Member]                                                                                            |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Liquid rich asset based acquired | a                                                                                                                 |     | 45             |           |           |   |   |   |
| Midland Basin [Member] | Rosetta Resources, Inc [Member]                                                                                             |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Long-term Debt, Fair Value                                                                                                                           | [2] | $ 2,000        |           |           |   |   |   |
| Liquid rich asset based acquired | a                                                                                                                 |     | 9              |           |           |   |   |   |
| Common Stock | Rosetta Resources, Inc [Member]                                                                                                       |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Shares exchange in acquisition | shares                                                                                                              |     | 41             |           |           |   |   |   |
| Exchange ratio of common shares for acquired company                                                                                                 |     | 0.542          |           |           |   |   |   |
| Rosetta Resources, Inc [Member] | Rosetta Resources, Inc [Member]                                                                                    |     |           |           |           |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                                |     |           |           |           |   |   |   |
| Merger related costs including noncash share-based compensation expense                                                                              |     |           |           | $ 32           |   | $ 37 |   |
|                                                                                                                                                      |
| [1]Amount represents expenses associated with the completion of the Rosetta Merger. See Note 3. Rosetta Merger[2]Excludes capital lease obligations. |

| X                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Combination, Acquisition Relate Costs Related To Noncash Share-based Compensation Expense
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| - Definition
Business Combination, Acquisition Related Costs Including Noncash Share-based Compensation Expense
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| - Definition
Business Combination, Gas And Oil Area Acquired
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| X                                                                                                                                                                                                                                                             |
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| - Definition
Business Combination, Stock Exchange Ratio
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of equity interests issued or issuable to acquire entity.
+ References
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| - Definition
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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| X                                                                                                                                                                                                                                                                                                                                |
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| - Definition
Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
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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.
+ References
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| - Definition
The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.
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| X                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of businesses acquired by the entity during the period.
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No definition available.
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