| **Rosetta Merger - Assets Acquired and Liabilities Assumed (Details) $ / shares in Units, shares in Millions, $ in Millions** | Jul. 20, 2015 USD ($) $ / shares shares |
|-------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------|
| **Business Acquisition [Line Items]**                                                                                         |                                    |
| Shares of Noble Energy common stock issued to Rosetta shareholders (in shares) | shares                                       | 41                                      |
| Rosetta Resources, Inc [Member]                                                                                               |                                    |
| **Business Acquisition [Line Items]**                                                                                         |                                    |
| Shares of Noble Energy common stock issued to Rosetta shareholders (in shares) | shares                                       | 41                                      |
| Noble Energy common stock price on July 20, 2015 | $ / shares                                                                 | $ 36.97                                 |
| Fair value of common stock issued                                                                                             | $ 1,518                                 |
| Plus: fair value of Rosetta's restricted stock awards and performance awards assumed                                          | 10                                      |
| Plus: Rosetta stock options assumed                                                                                           | 1                                       |
| Total purchase price                                                                                                          | 1,529                                   |
| **Plus: liabilities assumed by Noble Energy**                                                                                 |                                    |
| Accounts Payable                                                                                                              | 100                                     |
| Current Liabilities                                                                                                           | 37                                      |
| Long Term Deferred Tax Liability                                                                                              | 8                                       |
| Long-Term Debt                                                                                                                | 1,992                                   |
| Other Long Term Liabilities                                                                                                   | 23                                      |
| Asset Retirement Obligation                                                                                                   | 27                                      |
| Total purchase price plus liabilities assumed                                                                                 | 3,716                                   |
| **Fair Value of Rosetta Assets**                                                                                              |                                    |
| Cash and Equivalents                                                                                                          | 61                                      |
| Other Current Assets                                                                                                          | 76                                      |
| Derivative Instruments                                                                                                        | 209                                     |
| **Oil and Gas Properties**                                                                                                    |                                    |
| Proved Reserves                                                                                                               | 1,613                                   |
| Undeveloped Leaseholds                                                                                                        | 1,355                                   |
| Gathering & Processing Assets                                                                                             | 207                                     |
| Asset Retirement Obligation                                                                                                   | 27                                      |
| Other Property Plant and Equipment                                                                                            | 5                                       |
| Goodwill                                                                                                                      | 163                                     |
| Total Asset Value                                                                                                             | $ 3,716                                 |

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