| **Segment Information - Operating Results by Segment (Details) - USD ($) $ in Millions**   | 3 Months Ended | 9 Months Ended |
|--------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | $ 0            | $ 0            | $ 0 | $ 0 |
| Total                                                                                      | 1,273          | 960            | 3,789 | 3,055 |
| Lease Operating Expense                                                                    | 124            | 151            | 411 | 414 |
| Production and Ad Valorem Taxes                                                            | 47             | 31             | 151 | 104 |
| Gathering, Transportation and Processing Expense                                           | 97             | 93             | 292 | 333 |
| Total                                                                                      | 273            | 280            | 886 | 866 |
| DD&A                                                                                   | 485            | 523            | 1,418 | 1,554 |
| Loss on Debt Extinguishment                                                                | 0              | 98             | (3) | 98 |
| Gain on Divestitures, Net                                                                  | (193)          | 0              | (859) | 0 |
| Asset Impairments                                                                          | 0              | 0              | 168 | 0 |
| Purchased Oil and Gas                                                                      | 76             | 0              | 204 | 0 |
| Gain on Asset Retirement Obligation Revisions                                              | (10)           | (42)           | (21) | (42) |
| Loss on Marcellus Shale Exit Activities                                                    | 0              | 4              | 0 | 2,326 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 155            | 22             | 483 | (145) |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | (32)           |           | (6) |   |
| Income (Loss) Before Income Taxes                                                          | 307            | (208)          | 860 | (2,483) |
| Clayton Williams Energy Acquisition Expenses                                               | 0              | 4              | 0 | 98 |
| Intersegment Eliminations                                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | (91)           | (72)           | (257) | (198) |
| Total                                                                                      | (91)           | (72)           | (257) | (198) |
| Lease Operating Expense                                                                    | (12)           | (1)            | (18) | (6) |
| Production and Ad Valorem Taxes                                                            | 0              | 0              | 0 | 0 |
| Gathering, Transportation and Processing Expense                                           | (60)           | (56)           | (168) | (136) |
| Total                                                                                      | (72)           | (57)           | (186) | (142) |
| DD&A                                                                                   | (5)            | (1)            | (13) | (2) |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | 0              |           | 0 |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 0              |           | 0 |   |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 0              | 0              | 0 | 0 |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | (16)           | (12)           | (52) | (47) |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| Corporate                                                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 0              | 0              | 0 | 0 |
| Total                                                                                      | 0              | 0              | 0 | 0 |
| Lease Operating Expense                                                                    | 0              | 0              | 0 | 0 |
| Production and Ad Valorem Taxes                                                            | 0              | 0              | 0 | 0 |
| Gathering, Transportation and Processing Expense                                           | 0              | 0              | 0 | 0 |
| Total                                                                                      | 0              | 0              | 0 | 0 |
| DD&A                                                                                   | 10             | 12             | 33 | 34 |
| Loss on Debt Extinguishment                                                                |           | 98             |   | 98 |
| Gain on Divestitures, Net                                                                  | 0              |           | 0 |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 0              |           | 0 |   |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 0              | 0              | 0 | 0 |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | (170)          | (295)          | (498) | (657) |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| United States | Operating Segments                                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 0              | 0              | 0 | 0 |
| Total                                                                                      | 945            | 696            | 2,818 | 2,246 |
| Lease Operating Expense                                                                    | 114            | 118            | 354 | 332 |
| Production and Ad Valorem Taxes                                                            | 46             | 30             | 147 | 102 |
| Gathering, Transportation and Processing Expense                                           | 129            | 129            | 389 | 416 |
| Total                                                                                      | 294            | 282            | 922 | 865 |
| DD&A                                                                                   | 414            | 442            | 1,214 | 1,326 |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | 5              |           | 20 |   |
| Asset Impairments                                                                          |           |           | 168 |   |
| Purchased Oil and Gas                                                                      | 32             | 0              | 98 | 0 |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 2,326 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 140            | 16             | 400 | (138) |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | 31             | (115)          | (94) | (2,433) |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 98 |
| United States | Noble Midstream                                                            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 91             | 72             | 257 | 198 |
| Total                                                                                      | 168            | 92             | 451 | 251 |
| Lease Operating Expense                                                                    | 0              | 0              | 0 | 0 |
| Production and Ad Valorem Taxes                                                            | 1              | 1              | 4 | 2 |
| Gathering, Transportation and Processing Expense                                           | 28             | 20             | 71 | 53 |
| Total                                                                                      | 29             | 21             | 75 | 55 |
| DD&A                                                                                   | 24             | 10             | 62 | 20 |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | (198)          |           | (503) |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 44             |           | 106 |   |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 0              | 0              | 0 | 0 |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | 268            | 58             | 690 | 165 |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| Eastern Mediterranean | Operating Segments                                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 0              | 0              | 0 | 0 |
| Total                                                                                      | 124            | 141            | 368 | 406 |
| Lease Operating Expense                                                                    | 7              | 9              | 19 | 23 |
| Production and Ad Valorem Taxes                                                            | 0              | 0              | 0 | 0 |
| Gathering, Transportation and Processing Expense                                           | 0              | 0              | 0 | 0 |
| Total                                                                                      | 7              | 9              | 19 | 23 |
| DD&A                                                                                   | 16             | 18             | 44 | 58 |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | 0              |           | (376) |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 0              |           | 0 |   |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 0              | 0              | 0 | 0 |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | (32)           |           | (6) |   |
| Income (Loss) Before Income Taxes                                                          | 143            | 109            | 678 | 316 |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| West Africa | Operating Segments                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 0              | 0              | 0 | 0 |
| Total                                                                                      | 127            | 103            | 409 | 350 |
| Lease Operating Expense                                                                    | 15             | 25             | 56 | 65 |
| Production and Ad Valorem Taxes                                                            | 0              | 0              | 0 | 0 |
| Gathering, Transportation and Processing Expense                                           | 0              | 0              | 0 | 0 |
| Total                                                                                      | 15             | 25             | 56 | 65 |
| DD&A                                                                                   | 25             | 41             | 77 | 114 |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | 0              |           | 0 |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 0              |           | 0 |   |
| Gain on Asset Retirement Obligation Revisions                                              | 0              | 0              | 0 | 0 |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 15             | 6              | 83 | (7) |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | 68             | 24             | 180 | 162 |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| Other Int'l | Operating Segments                                                           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Intersegment Revenues                                                                      | 0              | 0              | 0 | 0 |
| Total                                                                                      | 0              | 0              | 0 | 0 |
| Lease Operating Expense                                                                    | 0              | 0              | 0 | 0 |
| Production and Ad Valorem Taxes                                                            | 0              | 0              | 0 | 0 |
| Gathering, Transportation and Processing Expense                                           | 0              | 0              | 0 | 0 |
| Total                                                                                      | 0              | 0              | 0 | 0 |
| DD&A                                                                                   | 1              | 1              | 1 | 4 |
| Loss on Debt Extinguishment                                                                |           | 0              |   | 0 |
| Gain on Divestitures, Net                                                                  | 0              |           | 0 |   |
| Asset Impairments                                                                          |           |           | 0 |   |
| Purchased Oil and Gas                                                                      | 0              |           | 0 |   |
| Gain on Asset Retirement Obligation Revisions                                              | (10)           | (42)           | (21) | (42) |
| Loss on Marcellus Shale Exit Activities                                                    |           |           |   | 0 |
| Loss (Gain) on Commodity Derivative Instruments                                            | 0              | 0              | 0 | 0 |
| Gain on Investment in Shares of Tamar Petroleum Ltd., Net                                  | 0              |           | 0 |   |
| Income (Loss) Before Income Taxes                                                          | (17)           | 23             | (44) | 11 |
| Clayton Williams Energy Acquisition Expenses                                               |           |           |   | 0 |
| Oil, NGL and Gas Sales                                                                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 1,136          | 907            | 3,409 | 2,918 |
| Oil, NGL and Gas Sales | Intersegment Eliminations                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Oil, NGL and Gas Sales | Corporate                                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Oil, NGL and Gas Sales | United States | Operating Segments                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 919            | 696            | 2,737 | 2,246 |
| Oil, NGL and Gas Sales | United States | Noble Midstream                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Oil, NGL and Gas Sales | Eastern Mediterranean | Operating Segments                        |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 124            | 141            | 368 | 406 |
| Oil, NGL and Gas Sales | West Africa | Operating Segments                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 93             | 70             | 304 | 266 |
| Oil, NGL and Gas Sales | Other Int'l | Operating Segments                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Crude Oil Sales                                                                            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 744            | 553            | 2,266 | 1,637 |
| Crude Oil Sales | Intersegment Eliminations                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Crude Oil Sales | Corporate                                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Crude Oil Sales | United States | Operating Segments                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 655            | 487            | 1,972 | 1,383 |
| Crude Oil Sales | United States | Noble Midstream                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Crude Oil Sales | Eastern Mediterranean | Operating Segments                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 2              | 2              | 6 | 5 |
| Crude Oil Sales | West Africa | Operating Segments                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 87             | 64             | 288 | 249 |
| Crude Oil Sales | Other Int'l | Operating Segments                                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales                                                                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 166            | 116            | 449 | 329 |
| NGL Sales | Intersegment Eliminations                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales | Corporate                                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales | United States | Operating Segments                                             |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 166            | 116            | 449 | 329 |
| NGL Sales | United States | Noble Midstream                                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales | Eastern Mediterranean | Operating Segments                                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales | West Africa | Operating Segments                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| NGL Sales | Other Int'l | Operating Segments                                               |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Natural Gas Sales                                                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 226            | 238            | 694 | 952 |
| Natural Gas Sales | Intersegment Eliminations                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Natural Gas Sales | Corporate                                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Natural Gas Sales | United States | Operating Segments                                     |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 98             | 93             | 316 | 534 |
| Natural Gas Sales | United States | Noble Midstream                                        |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Natural Gas Sales | Eastern Mediterranean | Operating Segments                             |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 122            | 139            | 362 | 401 |
| Natural Gas Sales | West Africa | Operating Segments                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 6              | 6              | 16 | 17 |
| Natural Gas Sales | Other Int'l | Operating Segments                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Cost of Purchased of Gas                                                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 72             | 0              | 191 | 0 |
| Cost of Purchased of Gas | Intersegment Eliminations                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              |           | 0 |   |
| Cost of Purchased of Gas | Corporate                                                       |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              |           | 0 |   |
| Cost of Purchased of Gas | United States | Operating Segments                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 26             |           | 81 |   |
| Purchased Oil and Gas                                                                      | 24             | 0              | 77 | 0 |
| Cost of Purchased of Gas | United States | Noble Midstream                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 46             |           | 110 |   |
| Cost of Purchased of Gas | Eastern Mediterranean | Operating Segments                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              |           | 0 |   |
| Cost of Purchased of Gas | West Africa | Operating Segments                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              |           | 0 |   |
| Cost of Purchased of Gas | Other Int'l | Operating Segments                                |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              |           | 0 |   |
| Income from Equity Method Investees and Other                                              |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 65             | 53             | 189 | 137 |
| Income from Equity Method Investees and Other | Intersegment Eliminations                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Income from Equity Method Investees and Other | Corporate                                  |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Income from Equity Method Investees and Other | United States | Operating Segments         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Income from Equity Method Investees and Other | United States | Noble Midstream            |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 31             | 20             | 84 | 53 |
| Income from Equity Method Investees and Other | Eastern Mediterranean | Operating Segments |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Income from Equity Method Investees and Other | West Africa | Operating Segments           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 34             | 33             | 105 | 84 |
| Income from Equity Method Investees and Other | Other Int'l | Operating Segments           |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Revenue from Sales                                                                         | 0              | 0              | 0 | 0 |
| Other Royalty Expense                                                                      |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 5              | 5              | 32 | 15 |
| Other Royalty Expense | Intersegment Eliminations                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 0              | 0              | 0 | 0 |
| Other Royalty Expense | Corporate                                                          |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 0              | 0              | 0 | 0 |
| Other Royalty Expense | United States | Operating Segments                                 |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 5              | 5              | 32 | 15 |
| Other Royalty Expense | United States | Noble Midstream                                    |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 0              | 0              | 0 | 0 |
| Other Royalty Expense | Eastern Mediterranean | Operating Segments                         |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 0              | 0              | 0 | 0 |
| Other Royalty Expense | West Africa | Operating Segments                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | 0              | 0              | 0 | 0 |
| Other Royalty Expense | Other Int'l | Operating Segments                                   |           |           |   |   |
| **Segment Reporting Information [Line Items]**                                             |           |           |   |   |
| Expense                                                                                    | $ 0            | $ 0            | $ 0 | $ 0 |

| X                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gain (Loss) On Revision Of Estimates For Asset Retirement Obligation
+ References
No definition available.
+ Details**Name:**nbl_GainLossOnRevisionOfEstimatesForAssetRetirementObligation**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Intersegment Revenues
+ References
No definition available.
+ Details**Name:**nbl_IntersegmentRevenues**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| 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
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460
+ Details**Name:**us-gaap_BusinessCombinationAcquisitionRelatedCosts**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.
+ References
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| - Definition
Costs of generating revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.
+ References
No definition available.
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| - Definition
The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.
+ References
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| - Definition
Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.
+ References
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| - Definition
Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.
+ References
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| - Definition
The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
+ References
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| - Definition
Amount of operating lease expense. Excludes sublease income.
+ References
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| - Definition
A tax assessed on oil and gas production.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
+ References
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| - Definition
Includes the cost to prepare and move liquid hydrocarbons and natural gas to their points of sale.
+ References
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| - Definition
Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ 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.
+ References
No definition available.
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