Cost Of Contracts (Detail) - USD ($) $ in Millions	Oct. 04, 2015	Dec. 31, 2014
Contractors [Abstract]
Contract costs and estimated profits	$ 7,581	$ 7,494
Other contract costs	1,018	1,064
Costs in excess of billings on uncompleted contracts or programs, total	8,599	8,558
Advances and progress payments	(4,384)	(3,967)
Total contracts in process	$ 4,215	$ 4,591