| **Acquisitions and Divestitures - Purchase Price Allocation (Details) - Clayton Williams Energy $ in Millions** | Apr. 24, 2017 USD ($) |
|-----------------------------------------------------------------------------------------------------------------|-----------------------|
| **Business Acquisition [Line Items]**                                                                           |                  |
| Fair Value of Common Stock Issued                                                                               | $ 1,851               |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                           | 637                   |
| Total Purchase Price                                                                                            | 2,488                 |
| **Plus Liabilities Assumed by Noble Energy:**                                                                   |                  |
| Accounts Payable                                                                                                | 99                    |
| Other Current Liabilities                                                                                       | 38                    |
| Long-Term Deferred Tax Liability                                                                                | 515                   |
| Long-Term Debt                                                                                                  | 595                   |
| Asset Retirement Obligations                                                                                    | 63                    |
| Total Purchase Price Plus Liabilities Assumed                                                                   | $ 3,798               |

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