| **Segment Information - Assets and Goodwill by Segment (Details) - USD ($) $ in Millions** | Mar. 31, 2019 | Dec. 31, 2018 |
|--------------------------------------------------------------------------------------------|---------------|---------------|
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | $ 18,701      | $ 18,419      |
| Operating Segments | United States                                                         |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | 13,145        | 13,044        |
| Operating Segments | Eastern Mediterranean                                                 |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | 2,728         | 2,630         |
| Operating Segments | West Africa                                                           |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | 736           | 805           |
| Operating Segments | Other Int'l                                                           |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | 119           | 37            |
| Noble Midstream | United States                                                            |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | 1,801         | 1,742         |
| Intersegment Eliminations                                                                  |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | (162)         | (145)         |
| Corporate                                                                                  |          |          |
| **Segment Reporting Information [Line Items]**                                             |          |          |
| Assets, net of AHFS                                                                        | $ 334         | $ 306         |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Sum of carrying amounts as of balance sheet date of all assets (with the exception of assets that are held for sale) that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or results.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_SegmentReportingInformationLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                  |
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| X                                                                                                                                        |
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| X                                                                                                                                                            |
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| X                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                          |
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| X                                                                                                                                                    |
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| X                                                                                                                                                    |
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