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Contracts in Process - Components of Contracts in Process (Detail) - USD ($)
$ in Millions
Sep. 25, 2015
Dec. 31, 2014
Components of contracts in process    
Unbilled contract receivables, gross $ 2,626 $ 2,280
Unliquidated progress payments (1,057) (887)
Unbilled contract receivables, net 1,569 1,393
Inventoried contract costs, gross 1,033 997
Unliquidated progress payments (119) (95)
Inventoried contract costs, net 914 902
Total contracts in process $ 2,483 $ 2,295