| **Marcellus Share Firm Transportation Contracts - Narrative (Details) $ in Millions** | 3 Months Ended | 9 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------|----------------|----------------|-----------------|
||
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Purchased Oil and Gas                                                                 |           | $ 76           | $ 0             | $ 204 | $ 0 |   |
| Committed transportation volume per day (in MMBtu) | MMBTU                            |           |           |            | 450,000 |   |   |
| Marcellus Shale Firm Transportation Agreement                                         |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Commitment amount                                                                     |           |           |            | $ 1,500 |   |   |
| Firm Transportation Accrual                                                           |           |           |            | $ 0 |   | $ 93 |
| Maximum | Marcellus Shale Firm Transportation Agreement                               |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Term                                                                                  |           |           |            | 15 years |   |   |
| Minimum | Marcellus Shale Firm Transportation Agreement                               |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Term                                                                                  |           |           |            | 4 years |   |   |
| Scenario, Forecast | Marcellus Shale Firm Transportation Agreement                    |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Commitment amount                                                                     | $ 925          |           |            |   |   |   |
| Retained Transportation Contract | Marcellus Shale Firm Transportation Agreement      |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Firm Transportation Accrual                                                           |           |           |            |   |   | 41 |
| Future Commitments | Marcellus Shale Firm Transportation Agreement                    |           |           |            |   |   |   |
| **Long-term Purchase Commitment [Line Items]**                                        |           |           |            |   |   |   |
| Firm Transportation Accrual                                                           |           |           |            |   |   | $ 52 |

| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Commitment Obligation, Term
+ References
No definition available.
+ Details**Name:**nbl_CommitmentObligationTerm**Namespace Prefix:**nbl_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Long-term Purchase Commitment, Accrual
+ References
No definition available.
+ Details**Name:**nbl_LongtermPurchaseCommitmentAccrual**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Long-term Supply Contract, Daily Volume Transported
+ References
No definition available.
+ Details**Name:**nbl_LongtermSupplyContractDailyVolumeTransported**Namespace Prefix:**nbl_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_CostOfServicesOilAndGas**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount the entity agreed to spend under the long-term purchase commitment.
+ References
No definition available.
+ Details**Name:**us-gaap_LongTermPurchaseCommitmentAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| 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_LongTermPurchaseCommitmentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_OtherCommitmentsAxis=nbl_MarcellusShaleFirmTransportationAgreementMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_RangeAxis=srt_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**srt_RangeAxis=srt_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=nbl_RetainedTransportationContractMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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