Inventories (Details) (USD $)	Dec. 28, 2013	Dec. 29, 2012
Inventories
Finished goods	$ 1,276,000,000	$ 1,329,000,000
Work in process	2,477,000,000	2,247,000,000
Raw materials and components	407,000,000	437,000,000
Inventories, Gross	4,160,000,000	4,013,000,000
Progress/milestone payments	(1,197,000,000)	(1,301,000,000)
Total	2,963,000,000	2,712,000,000
Inventories by LIFO method	1,300,000,000	1,100,000,000
LIFO carrying value at current cost	461,000,000	435,000,000
Inventories related to long term contract	$ 359,000,000	$ 382,000,000