| **Derivative Instruments and Hedging Activities (Details 2) (USD $)In Millions, unless otherwise specified** | 12 Months Ended                                                                                                                           |
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| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Commodity Derivative Assets, Current                                                                         | $ 710us-gaap_DerivativeAssetsCurrent                                                                                                      | $ 1us-gaap_DerivativeAssetsCurrent |   |
| Commodity Derivative Assets, Noncurrent                                                                      | 180us-gaap_DerivativeAssetsNoncurrent                                                                                                     | 16us-gaap_DerivativeAssetsNoncurrent |   |
| Derivative Asset                                                                                             | 890us-gaap_DerivativeAssets                                                                                                               | 17us-gaap_DerivativeAssets |   |
| Liability Derivative Instruments                                                                             | 0us-gaap_DerivativeFairValueOfDerivativeLiability                                                                                         | 75us-gaap_DerivativeFairValueOfDerivativeLiability |   |
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net                               | (976)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet                                                            | 133us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | (75)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet |
| Total Cash (Received) Paid in settlement of Commodity Derivative Instrument                                  | (29)us-gaap_GainLossOnSaleOfDerivatives                                                                                                   | 2us-gaap_GainLossOnSaleOfDerivatives | 34us-gaap_GainLossOnSaleOfDerivatives |
| Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                    | (947)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts                                                                         | 131us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | (109)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts |
| Crude Oil [Member]                                                                                           |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net                               | (897)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember          | 139us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember | (37)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember |
| Total Cash (Received) Paid in settlement of Commodity Derivative Instrument                                  | (34)us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember                                                 | 52us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember | 83us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember |
| Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                    | (863)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember                       | 87us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember | (120)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts/ nbl_DerivativeByRiskAxis= us-gaap_CrudeOilMember |
| Natural Gas [Member]                                                                                         |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net                               | (79)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember | (6)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember | (38)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember |
| Total Cash (Received) Paid in settlement of Commodity Derivative Instrument                                  | 5us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember                                          | (50)us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember | (49)us-gaap_GainLossOnSaleOfDerivatives/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember |
| Total Non-cash Portion of (Gain) Loss on Commodity Derivative Instruments                                    |                                                                                                                                      | 44us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember | 11us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts/ nbl_DerivativeByRiskAxis= us-gaap_NaturalGasReservesMember |
| Current Assets                                                                                               |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Commodity Derivative Assets, Current                                                                         | 710us-gaap_DerivativeAssetsCurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherCurrentAssetsMember                                    | 1us-gaap_DerivativeAssetsCurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherCurrentAssetsMember |   |
| Current Liabilities                                                                                          |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Liability Derivative Instruments                                                                             | 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= nbl_CurrentLiabilitiesMember                         | 65us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= nbl_CurrentLiabilitiesMember |   |
| Noncurrent Assets                                                                                            |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Commodity Derivative Assets, Noncurrent                                                                      | 180us-gaap_DerivativeAssetsNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember                                        | 16us-gaap_DerivativeAssetsNoncurrent/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherAssetsMember |   |
| Noncurrent Liabilities                                                                                       |                                                                                                                                      |   |   |
| **Derivatives, Fair Value [Line Items]**                                                                     |                                                                                                                                      |   |   |
| Liability Derivative Instruments                                                                             | $ 0us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember                     | $ 10us-gaap_DerivativeFairValueOfDerivativeLiability/ us-gaap_BalanceSheetLocationAxis= us-gaap_OtherLiabilitiesMember |   |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.
+ References
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