| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Narrative (Details) $ in Millions**                  | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------|----------------|
||
| Delaware Basin                                                                                                              |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | $ 2,100        |
| Eagle Ford Shale                                                                                                            |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | 100            |
| Other US Onshore Properties                                                                                                 |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | 70             |
| Other Int'l                                                                                                                 |           |
| **Projects with Exploratory Well Costs Capitalized for More than One Year Since The Commencement of Drilling [Line Items]** |           |
| Capitalized undeveloped leasehold cost                                                                                      | $ 59           |

| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Capitalized Undeveloped Leasehold Cost
+ 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_ProjectsWithExploratoryWellCostsCapitalizedForMoreThanOneYearLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                             |
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| - Details**Name:**srt_StatementGeographicalAxis=nbl_EagleFordShaleMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                        |
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| X                                                                                                                                             |
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