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Inventories (Details) - USD ($) $ in Millions	Sep. 29, 2018	Jul. 02, 2018	Dec. 31, 2017	Dec. 30, 2017
Inventories
Finished goods	$ 1,740			$ 1,790
Work in process	1,540			2,238
Raw materials and components	750			804
Inventories, Gross	4,030			4,832
Progress/milestone payments				(682)
Total	4,030			$ 4,150
Effect of adoption of ASC 606 \| ASC 606
Inventories
Total	$ 207		$ (199)
Tools and Test Equipment \| Disposition of businesses
Inventories
Inventories		$ 100