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Inventoried Costs, Net (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Production costs of contracts in process $ 1,257us-gaap_InventoryWorkInProcessNetOfReserves $ 1,342us-gaap_InventoryWorkInProcessNetOfReserves
General and administrative expenses 252us-gaap_InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory 259us-gaap_InventoryForLongTermContractsOrProgramsGeneralAndAdministrativeCostsIncludedInInventory
Inventoried costs 1,509us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves 1,601us-gaap_InventoryFinishedGoodsAndWorkInProcessNetOfReserves
Progress and performance-based payments received (873)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms (1,005)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms
Inventoried costs, net of progress payments 636noc_InventoriedCostsNetOfProgressPayments 596noc_InventoriedCostsNetOfProgressPayments
Product inventory 106us-gaap_OtherInventoryNetOfReserves 102us-gaap_OtherInventoryNetOfReserves
Total inventoried costs, net $ 742us-gaap_InventoryForLongTermContractsOrPrograms $ 698us-gaap_InventoryForLongTermContractsOrPrograms