| **Clayton Williams Energy Acquisition - Fair Value of Acquired Assets (Details) - USD ($) $ in Millions** | Dec. 31, 2017 | Apr. 24, 2017 | Dec. 31, 2016 | Dec. 30, 2015 |
|-----------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|
| **Business Acquisition [Line Items]**                                                                     |          |          |          |          |
| Goodwill                                                                                                  | $ 1,310       |          | $ 0           | $ 779         |
| Clayton Williams Energy                                                                                   |          |          |          |          |
| **Business Acquisition [Line Items]**                                                                     |          |          |          |          |
| Cash and Equivalents                                                                                      |          | $ 21          |          |          |
| Other Current Assets                                                                                      |          | 70            |          |          |
| Proved Reserves                                                                                           |          | 722           |          |          |
| Undeveloped Leasehold Cost                                                                                |          | 1,571         |          |          |
| Gathering and Processing Assets                                                                           |          | 48            |          |          |
| Asset Retirement Costs                                                                                    |          | 63            |          |          |
| Other Property Plant and Equipment                                                                        |          | 12            |          |          |
| Goodwill                                                                                                  | $ 1,300       | 1,310         |          |          |
| Total Asset Value                                                                                         |          | $ 3,817       |          |          |

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