| **Exit Costs - Transportation Commitments - Rollfoward of Accrued Transportation Commitment (Details) - Marcellus Shale Firm Transportation Agreement - USD ($) $ in Millions** | 3 Months Ended |        |        |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|--------|
||
| **Rollforward Of Contractual Obligations [Roll Forward]**                                                                                                                       |           |   |   |   |
| Balance at Beginning of Period                                                                                                                                                  | $ 80           | $ 90   |   |   |
| Firm Transportation Exit Cost Accrual                                                                                                                                           | 92             | 0      |   |   |
| Payments, Net of Accretion                                                                                                                                                      | (5)            | (6)    |   |   |
| Balance at End of Period                                                                                                                                                        | 167            | 84     |   |   |
| Other Current Liabilities                                                                                                                                                       |           |   |   |   |
| **Rollforward Of Contractual Obligations [Roll Forward]**                                                                                                                       |           |   |   |   |
| Balance at End of Period                                                                                                                                                        | 11             | 11     |   |   |
| Accrued exit costs, current                                                                                                                                                     |           |   | $ 13   | $ 13 |
| Other Noncurrent Liabilities                                                                                                                                                    |           |   |   |   |
| **Rollforward Of Contractual Obligations [Roll Forward]**                                                                                                                       |           |   |   |   |
| Balance at End of Period                                                                                                                                                        | $ 156          | $ 73   |   |   |

| X                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Firm Transportation Commitment
+ References
No definition available.
+ Details**Name:**nbl_FirmTransportationCommitment**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Firm Transportation Commitment, Current
+ References
No definition available.
+ Details**Name:**nbl_FirmTransportationCommitmentCurrent**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| 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 Purchase Commitment, Settlement
+ References
No definition available.
+ Details**Name:**nbl_LongtermPurchaseCommitmentSettlement**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Rollforward Of Contractual Obligations [Roll Forward]
+ References
No definition available.
+ Details**Name:**nbl_RollforwardOfContractualObligationsRollForward**Namespace Prefix:**nbl_**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:**us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentLiabilitiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |