| **Acquisitions and Divestitures - Consideration Transferred and Purchase Price Allocation (Details) - USD ($) $ in Millions** |         | 9 Months Ended |        |
|-------------------------------------------------------------------------------------------------------------------------------|---------|----------------|--------|
||
| **Business Acquisition [Line Items]**                                                                                         |    |           |   |   |
| Fair Value of Common Stock Issued                                                                                             | $ 1,851 |           |   |   |
| Plus: Cash Consideration Paid to Clayton Williams Energy Stockholders                                                         | 637     | $ 0            | $ 616  |   |
| 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   |           |   |   |
| Cash and Cash Equivalents                                                                                                     | 21      |           |   |   |
| Other Current Assets                                                                                                          | 70      |           |   |   |
| **Oil and Gas Properties:**                                                                                                   |    |           |   |   |
| Proved Reserves                                                                                                               | 722     |           |   |   |
| Undeveloped Leasehold Costs                                                                                                   | 1,571   |           |   |   |
| Gathering and Processing Assets                                                                                               | 48      |           |   |   |
| Asset Retirement Costs                                                                                                        | 63      |           |   |   |
| Other Noncurrent Assets                                                                                                       | 12      |           |   |   |
| Goodwill                                                                                                                      | 1,291   | $ 1,401        |   | $ 1,310 |
| Total Asset Value                                                                                                             | $ 3,798 |           |   |   |

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