2.2.0.7 true Subsequent Events (Details) (USD $) 0614 - Disclosure - Subsequent Events (Details) true false false false 1 false false Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 false 2 USD true false false false ne_AggregateSubsequentlyIssuedDebtMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi ne_AggregateSubsequentlyIssuedDebtMember us-gaap_DebtInstrumentAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 3 USD true false false false ne_AggregateSubsequentlyIssuedDebtMember us-gaap_DebtInstrumentAxis xbrldi http://xbrl.org/2006/xbrldi ne_AggregateSubsequentlyIssuedDebtMember us-gaap_DebtInstrumentAxis explicitMember Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 3 Debt Instrument [Line Items] 1 us-gaap_DebtInstrumentLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 4 Unsecured long-term senior notes outstanding 2 us-gaap_SeniorNotes us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 true true false false 1250000000 1250000000 true false false xbrli:monetaryItemType monetary Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 false 7 Proceeds from issuance of senior long term debt 2 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt us-gaap true debit duration No definition available. false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 true true false false 1240000000 1240000000 true false false 3 false false false false 0 0 true false false xbrli:monetaryItemType monetary The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 19 -Subparagraph b false 9 Subsequent Events (Textuals) 1 ne_SubsequentEventsTextualsAbstract ne false na duration Subsequent Events Textuals false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false xbrli:stringItemType string Subsequent Events Textuals false 11 Agreement one period in years 2 ne_AgreementPeriod ne false na instant Agreement period. false false false false false false false false false false false verboselabel false 1 false true false false 10 10 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false xbrli:positiveIntegerItemType positiveinteger Agreement period. No authoritative reference available. false 12 Agreement two period in years 2 ne_AgreementTwoPeriodInYears ne false na instant Agreement two period in years false false false false false false false false false false false label false 1 false true false false 10 10 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false xbrli:positiveIntegerItemType positiveinteger Agreement two period in years No authoritative reference available. false 13 Agreement three period of extension in years 2 ne_AgreementThreePeriodOfExtensionInYears ne false na instant Agreement three period of extension in years false false false false false false false false false false false label false 1 false true false false 3 3 false false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false xbrli:positiveIntegerItemType positiveinteger Agreement three period of extension in years No authoritative reference available. false 14 Number of tranches of debt issued 2 ne_NumberOfTranchesOfDebtIssued ne false na instant Number of tranches of debt issued false false false false false false false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 true false false 3 false true false false 3 3 true false false xbrli:positiveIntegerItemType positiveinteger Number of tranches of debt issued No authoritative reference available. false 3 8 false NoRounding UnKnown UnKnown false true