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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Total income (loss) before income taxes $ 1,032,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 201,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ (1,374,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments  
Components of Deferred Tax Assets and Liabilities [Abstract]        
Valuation Allowance, Amount (549,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (584,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (457,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (11,000,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax asset:        
Net operating loss carryforwards 173,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 335,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards    
Alternative minimum tax credit 99,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 99,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Stock compensation 26,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 25,000,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost    
Marketable securities 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities 3,000,000us-gaap_DeferredTaxAssetsUnrealizedLossesOnTradingSecurities    
Oil and gas properties 0nfx_DeferredTaxAssetsOilAndGasProperties 59,000,000nfx_DeferredTaxAssetsOilAndGasProperties    
Valuation Allowance (549,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (584,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (457,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (11,000,000)us-gaap_DeferredTaxAssetsValuationAllowance
Foreign tax credit 547,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 535,000,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign    
Other 8,000,000us-gaap_DeferredTaxAssetsOther 6,000,000us-gaap_DeferredTaxAssetsOther    
Deferred tax asset 304,000,000us-gaap_DeferredTaxAssetsNet 491,000,000us-gaap_DeferredTaxAssetsNet    
Commodity derivatives 0us-gaap_DeferredTaxAssetsDerivativeInstruments 13,000,000us-gaap_DeferredTaxAssetsDerivativeInstruments    
Deferred tax liability:        
Commodity derivatives (217,000,000)us-gaap_DeferredTaxLiabilitiesDerivatives 0us-gaap_DeferredTaxLiabilitiesDerivatives    
Oil and gas properties (1,715,000,000)nfx_DeferredTaxLiabilityOilAndGasProperties (1,592,000,000)nfx_DeferredTaxLiabilityOilAndGasProperties    
Deferred tax liability (1,932,000,000)us-gaap_DeferredTaxLiabilities (1,592,000,000)us-gaap_DeferredTaxLiabilities    
Deferred Tax Assets (Liabilities), Net, Total (1,628,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (1,101,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNet    
Deferred Tax Liabilities, Net, Current (144,000,000)us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent    
Less net current deferred tax liability 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 22,000,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Deferred Tax Assets (Liabilities), Net, Noncurrent (1,484,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (1,123,000,000)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent    
Deferred Tax Assets, Gross 853,000,000us-gaap_DeferredTaxAssetsGross 1,075,000,000us-gaap_DeferredTaxAssetsGross    
Income tax reconciliation to US federal statutory rate        
Amount computed using the statutory rate 361,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 70,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (481,000,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Increase (decrease) in taxes resulting from:        
State and local income taxes, net of federal effect 17,000,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 8,000,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (18,000,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Other 3,000,000us-gaap_IncomeTaxReconciliationOtherAdjustments (1,000,000)us-gaap_IncomeTaxReconciliationOtherAdjustments 0us-gaap_IncomeTaxReconciliationOtherAdjustments  
Total income tax provision (benefit) 382,000,000us-gaap_IncomeTaxExpenseBenefit 128,000,000us-gaap_IncomeTaxExpenseBenefit (452,000,000)us-gaap_IncomeTaxExpenseBenefit  
Income Taxes (Textuals) [Abstract]        
Federal statutory tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Net operating loss carryforwards subject to annual limitations 155,000,000nfx_NetOperatingLossCarryforwardsSubjectToAnnualLimitations      
International Nols That We Do Not Anticipate Utilizing   17,000,000nfx_InternationalNolsThatWeDoNotAnticipateUtilizing    
US state NOLs that we do not anticipate utilizing 64,000,000nfx_UsNolThatWeDoNotAnticipateUtilizing      
U.S. [Member]        
Income Tax Contingency [Line Items]        
Total income (loss) before income taxes 1,022,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 170,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 (1,414,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		  
Foreign [Member]        
Income Tax Contingency [Line Items]        
Total income (loss) before income taxes 10,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 31,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 40,000,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
Increase (decrease) in taxes resulting from:        
Valuation allowance, state net of federal 1,000,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 53,000,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 47,000,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		  
State and Local Jurisdiction [Member]        
Components of Deferred Tax Assets and Liabilities [Abstract]        
Operating Loss Carryforwards 1,600,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 1,700,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Increase (decrease) in taxes resulting from:        
Valuation allowance, state net of federal 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 (2,000,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		  
Federal [Member]        
Components of Deferred Tax Assets and Liabilities [Abstract]        
Operating Loss Carryforwards 500,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		 1,000,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Valuation Allowance, Tax Credit Carryforward [Member] | Foreign [Member]        
Income Tax Contingency [Line Items]        
Valuation Allowance, Deferred Tax Asset, Change in Amount 12,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		 114,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		 421,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		  
Valuation Allowance, Tax Credit Carryforward [Member] | Malaysia [Member]        
Income Tax Contingency [Line Items]        
Valuation Allowance, Deferred Tax Asset, Change in Amount (40,000,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= nfx_MalaysiaMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		 15,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= nfx_MalaysiaMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		 25,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= nfx_MalaysiaMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceTaxCreditCarryforwardMember		  
Valuation Allowance, Operating Loss Carryforwards [Member] | U.S. [Member]        
Income Tax Contingency [Line Items]        
Valuation Allowance, Deferred Tax Asset, Change in Amount $ (1,000,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		 $ (2,000,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		 $ 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember