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Inventories (Details) (USD $)
Dec. 29, 2012
Dec. 31, 2011
Inventories    
Finished goods $ 1,329,000,000 $ 1,012,000,000
Work in process 2,247,000,000 2,202,000,000
Raw materials and components 437,000,000 399,000,000
Inventories, Gross 4,013,000,000 3,613,000,000
Progress/milestone payments (1,301,000,000) (1,211,000,000)
Total 2,712,000,000 2,402,000,000
Inventories by LIFO method 1,100,000,000 1,000,000,000
LIFO carrying value at current cost 435,000,000 422,000,000
Inventories related to long term contract $ 382,000,000 $ 414,000,000