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Long-Term Debt (Details 3) (Five Year Term [Member], Revolving Credit Facility [Member], USD $)
17 Months Ended
Dec. 31, 2014
Aug. 31, 2013
Five Year Term [Member] | Revolving Credit Facility [Member]
   
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,775,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= noc_FiveYearTermMember
Credit Facility, Covenant Terms, Maximum Debt to Capitalization Ratio 65.00%noc_CreditFacilityCovenantTermsMaximumDebttoCapitalizationRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= noc_FiveYearTermMember
 
Line of Credit Facility, Amount Outstanding $ 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= noc_FiveYearTermMember