XML 30 R70.htm IDEA: XBRL DOCUMENT v2.4.1.9
Segment Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Operating_Segments
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Number of Operating Segments 4us-gaap_NumberOfOperatingSegments    
Oil and Gas Sales Revenue $ 4,931,000,000us-gaap_OilAndGasSalesRevenue $ 4,809,000,000us-gaap_OilAndGasSalesRevenue $ 4,037,000,000us-gaap_OilAndGasSalesRevenue
Income from Equity Method Investees 170,000,000us-gaap_IncomeLossFromEquityMethodInvestments 206,000,000us-gaap_IncomeLossFromEquityMethodInvestments 186,000,000us-gaap_IncomeLossFromEquityMethodInvestments
Revenues 5,101,000,000us-gaap_Revenues 5,015,000,000us-gaap_Revenues 4,223,000,000us-gaap_Revenues
DD&A 1,759,000,000us-gaap_DepreciationDepletionAndAmortization 1,568,000,000us-gaap_DepreciationDepletionAndAmortization 1,370,000,000us-gaap_DepreciationDepletionAndAmortization
Asset Impairments 500,000,000us-gaap_ImpairmentOfOilAndGasProperties 86,000,000us-gaap_ImpairmentOfOilAndGasProperties 104,000,000us-gaap_ImpairmentOfOilAndGasProperties
Gain on Divestitures (73,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty (36,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty (154,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (976,000,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet 133,000,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet (75,000,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Income (Loss) from Continuing Operations Before Income Taxes 1,710,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,344,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 1,356,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Equity Method Investments 325,000,000us-gaap_EquityMethodInvestments 437,000,000us-gaap_EquityMethodInvestments 367,000,000us-gaap_EquityMethodInvestments
Additions to Long-Lived Assets 5,152,000,000us-gaap_PropertyPlantAndEquipmentAdditions 4,534,000,000us-gaap_PropertyPlantAndEquipmentAdditions 3,525,000,000us-gaap_PropertyPlantAndEquipmentAdditions
Goodwill at End of Year 620,000,000us-gaap_Goodwill 627,000,000us-gaap_Goodwill 635,000,000us-gaap_Goodwill
Total Assets at End of Year 22,553,000,000nbl_AssetsNetOfAhfs 19,598,000,000nbl_AssetsNetOfAhfs 17,509,000,000nbl_AssetsNetOfAhfs
Foreign Countries [Member]      
Segment Reporting Information [Line Items]      
Other Revenue, Net 1,800,000,000us-gaap_OtherSalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_ForeignCountriesMember
  1,700,000,000us-gaap_OtherSalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_ForeignCountriesMember
Total Assets at End of Year 4,400,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_ForeignCountriesMember
4,500,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_ForeignCountriesMember
4,200,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_ForeignCountriesMember
United States [Member]      
Segment Reporting Information [Line Items]      
Oil and Gas Sales Revenue 3,175,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
3,004,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
2,339,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Income from Equity Method Investees 9,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Revenues 3,184,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
3,004,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
2,339,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
DD&A 1,318,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
1,117,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
929,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Asset Impairments 392,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
39,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
73,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Gain on Divestitures (34,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
(36,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
(154,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (604,000,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
67,000,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
(76,000,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Income (Loss) from Continuing Operations Before Income Taxes 1,150,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
790,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
806,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Equity Method Investments 82,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
184,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
121,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Additions to Long-Lived Assets 4,389,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
3,475,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
2,046,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Goodwill at End of Year 620,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
627,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
635,000,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
Total Assets at End of Year 16,400,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
13,094,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
11,199,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
West Africa [Member]      
Segment Reporting Information [Line Items]      
Oil and Gas Sales Revenue 1,177,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,252,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,343,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Income from Equity Method Investees 161,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
206,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
186,000,000us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Revenues 1,338,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,458,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,529,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
DD&A 299,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
261,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
255,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Asset Impairments 0us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Gain on Divestitures 0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (372,000,000)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
66,000,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,000,000us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Income (Loss) from Continuing Operations Before Income Taxes 1,222,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
936,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
1,074,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Equity Method Investments 223,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
234,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
230,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Additions to Long-Lived Assets 261,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
453,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
447,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Goodwill at End of Year 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Total Assets at End of Year 2,763,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
3,199,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
3,063,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AfricaMember
Eastern Mediterranean [Member]      
Segment Reporting Information [Line Items]      
Oil and Gas Sales Revenue 479,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
391,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
178,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Income from Equity Method Investees 0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Revenues 479,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
391,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
178,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
DD&A 63,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
97,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
111,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Asset Impairments 14,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
47,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
31,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Gain on Divestitures 0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Income (Loss) from Continuing Operations Before Income Taxes 284,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
162,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
9,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Equity Method Investments    0us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Additions to Long-Lived Assets 201,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
420,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
869,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Goodwill at End of Year 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Total Assets at End of Year 2,806,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
2,753,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
2,572,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= nbl_EasternMediterraneanMember
Other International And Corporate [Member]      
Segment Reporting Information [Line Items]      
Oil and Gas Sales Revenue 100,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
162,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
177,000,000us-gaap_OilAndGasSalesRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Income from Equity Method Investees 0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Revenues 100,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
162,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
177,000,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
DD&A 79,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
93,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
75,000,000us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Asset Impairments 94,000,000us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_ImpairmentOfOilAndGasProperties
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Gain on Divestitures (39,000,000)us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_GainLossOnSaleOfOilAndGasProperty
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Income (Loss) from Continuing Operations Before Income Taxes (946,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(544,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
(533,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Equity Method Investments 20,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
19,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
16,000,000us-gaap_EquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Additions to Long-Lived Assets 301,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
186,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
163,000,000us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Goodwill at End of Year 0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
0us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Total Assets at End of Year $ 584,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 552,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
$ 675,000,000nbl_AssetsNetOfAhfs
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember