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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 105us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 $ 75us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1 $ 47us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1  
Total stock-based compensation expense 65us-gaap_AllocatedShareBasedCompensationExpense 55us-gaap_AllocatedShareBasedCompensationExpense 35us-gaap_AllocatedShareBasedCompensationExpense  
Capitalized in oil and gas properties (40)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount (20)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount (12)us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 803,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 2,728,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod 1,773,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Number of restricted stock shares vested 1,176,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 1,195,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod 1,066,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod  
Number of restricted stock shares outstanding 2,847,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 3,705,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 2,809,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 2,480,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Fair value of units vested during the period 43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 47us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue  
Share Based Compensation Arrangement Exercise Rate 20.00%nfx_ShareBasedCompensationArrangementExerciseRate      
Nonvested Awards, Total Compensation Cost Not yet Recognized 70us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Liability Value 384us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue      
Obligations, Fair Value Disclosure 15us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations 16us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations    
Stock-Based Compensation (Textuals) [Abstract]        
Unrecognized net operating loss related to Stock Based Compensation 99nfx_UnrecognizedNetOperatingLossRelatedToStockBasedCompensation      
Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 4 years 0 months      
Last reported sales price of our common stock on the New York Stock Exchange per share $ 27.12us-gaap_SharePrice      
$27.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SVAP Price Threshold   $ 27.50nfx_SVAPPriceThreshold
/ us-gaap_VestingAxis
= nfx_A27.50Member
   
$32.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SVAP Price Threshold $ 32.50nfx_SVAPPriceThreshold
/ us-gaap_VestingAxis
= nfx_A32.50Member
     
$37.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SVAP Price Threshold $ 37.50nfx_SVAPPriceThreshold
/ us-gaap_VestingAxis
= nfx_A37.50Member
     
$42.50 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
SVAP Price Threshold $ 42.50nfx_SVAPPriceThreshold
/ us-gaap_VestingAxis
= nfx_A42.50Member
     
Equity [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 47us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_EquityMember
48us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_EquityMember
46us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_EquityMember
 
Liability [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 58us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_LiabilityMember
27us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_LiabilityMember
1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_LiabilityMember
 
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reduction factor multiplied by number of shares awarded 1nfx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFactorMultipliedByAwardsUsedToDetermineSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Additional shares available for issuance 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Cash-Settled Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 20us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
 
Service Period 3 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 759,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
     
Number of restricted stock shares vested 587,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
85,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
   
Number of restricted stock shares outstanding 1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
     
Nonvested Awards, Total Compensation Cost Not yet Recognized 18us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
     
Liability Settlements 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
   
Obligations, Fair Value Disclosure 12us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
/ us-gaap_AwardTypeAxis
= nfx_CashSettledRestrictedStockUnitsMember
     
Stockholder Value Appreciation Program [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 38us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
18us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
 
Service Period 1 year      
Nonvested Awards, Total Compensation Cost Not yet Recognized 1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
Weighted Average Volatility Rate 47.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
Liability Value 3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
Liability Settlements 13us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
SVAP Incremental Price Threshold $ 5nfx_SVAPIncrementalPriceThreshold
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
Fair Value Assumptions, Risk Free Interest Rate 0.27%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueTotal 4nfx_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValueTotal
/ us-gaap_AwardTypeAxis
= nfx_StockholderValueAppreciationProgramMember
     
Service - Based Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 465,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
2,428,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
1,589,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
 
Number of restricted stock shares vested 1,146,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
1,195,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
977,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
 
Number of restricted stock shares outstanding 1,902,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
2,999,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
2,371,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
2,123,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_ServiceBasedSharesMember
Performance Market Based Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 338,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
184,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
 
Number of restricted stock shares vested 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
89,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
 
Number of restricted stock shares outstanding 945,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
706,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
438,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
357,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= nfx_PerformanceMarketBasedSharesMember
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Reduction factor multiplied by number of shares awarded 1.87nfx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsFactorMultipliedByAwardsUsedToDetermineSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Additional shares available for issuance 1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Payments $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendPayments
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember