| **Capitalized Exploratory Well Costs and Undeveloped Leasehold Costs - Rollforward of Undeveloped Lease Costs (Details) - USD ($) $ in Millions** | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Proved Developed and Undeveloped Reserves [Roll Forward]**                                                                                      |            |   |
| Undeveloped Leasehold Costs, Beginning of Period                                                                                                  | $ 2,922         | $ 2,197 |
| Additions to Undeveloped Leasehold Costs                                                                                                          | 47              | 1,859 |
| Transfers to Proved Properties                                                                                                                    | (453)           | (174) |
| Assets Sold                                                                                                                                       | (142)           | (884) |
| Impairment                                                                                                                                        | (1)             | (62) |
| Other                                                                                                                                             | 0               | (14) |
| Undeveloped Leasehold Costs, Net of Impairment, End of Period                                                                                     | $ 2,373         | $ 2,922 |

| X                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Additions
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsAdditions**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Divestitures
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsDivestitures**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Impaired During Period
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsImpairedDuringPeriod**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Net
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsNet**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Other Activity
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsOtherActivity**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Undeveloped Leasehold Costs, Transfers To Proved Properties
+ References
No definition available.
+ Details**Name:**nbl_UndevelopedLeaseholdCostsTransfersToProvedProperties**Namespace Prefix:**nbl_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
+ Details**Name:**srt_IncreaseDecreaseInProvedDevelopedAndUndevelopedReservesRollForward**Namespace Prefix:**srt_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |