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Supplementary Oil and Gas Disclosure (Unaudited) - Standardized Measure (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Cash Inflows $ 33,941us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows $ 30,485us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows $ 25,664us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows  
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Production Costs (12,292)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (10,032)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts (9,065)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts  
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Development Costs (4,684)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts (4,457)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts (4,233)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts  
DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesBeforeIncomeTaxExpense 16,965nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense 15,996nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense 12,366nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense  
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense (4,670)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (4,594)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense (3,091)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense  
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows, Total 12,295us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 11,402us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows 9,275us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows  
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows (6,083)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (5,569)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows (4,839)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows  
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves 6,212us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves 5,833us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves 4,436us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves 5,981us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
Domestic [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Cash Inflows 31,758us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
26,600us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
21,724us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Production Costs (11,508)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(8,302)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(7,042)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Development Costs (4,611)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(4,166)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(3,949)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesBeforeIncomeTaxExpense 15,639nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
14,132nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
10,733nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense (4,449)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(4,278)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(2,786)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows, Total 11,190us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
9,854us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
7,947us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows (5,860)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(5,226)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
(4,539)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
 
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves 5,330us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
4,628us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
3,408us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
4,724us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= nfx_DomesticMember
Malaysia [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Cash Inflows 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_MY
1,245us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_MY
1,754us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Production Costs 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
(771)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
(1,135)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Development Costs 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
(148)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
(82)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_MY
 
DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesBeforeIncomeTaxExpense 0nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_MY
326nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_MY
537nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_MY
0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_MY
(66)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows, Total 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
326us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
471us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
(23)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
(55)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_MY
 
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves 0us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_MY
303us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_MY
416us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_MY
692us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_MY
China [Member]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Cash Inflows 2,183us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_CN
2,640us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_CN
2,186us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Net Cash Flows [Abstract]        
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Production Costs (784)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
(959)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
(888)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Development Costs (73)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
(143)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
(202)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementGeographicalAxis
= country_CN
 
DiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesBeforeIncomeTaxExpense 1,326nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_CN
1,538nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_CN
1,096nfx_Discountedfuturenetcashflowsrelatingtoprovedoilandgasreservesbeforeincometaxexpense
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Income Tax Expense (221)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_CN
(316)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_CN
(239)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Future Net Cash Flows, Total 1,105us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
1,222us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
857us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves, 10 Percent Annual Discount for Estimated Timing of Cash Flows (223)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
(320)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
(245)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementGeographicalAxis
= country_CN
 
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves $ 882us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 902us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 612us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_CN
$ 565us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementGeographicalAxis
= country_CN