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Contracts in Process - Components of Contracts in Progress (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Components of contracts in process    
Unbilled contract receivables, gross $ 2,874 $ 2,677
Unliquidated progress payments (1,265) (1,146)
Unbilled contract receivables, net 1,609 1,531
Inventoried contract costs, gross 1,111 934
Unliquidated progress payments (68) (79)
Inventoried contract costs, net 1,043 855
Total contracts in process $ 2,652 $ 2,386