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Subsequent Events (Details) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Subsequent Event [Member]
 
Subsequent Event [Line Items]  
Severance Costs $ 10us-gaap_SeveranceCosts1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Headcount Reduction 15.00%nfx_HeadcountReduction
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember