Contracts in Process - General and Administrative, Independent Research and Development and Bid and Proposal Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Inventory Disclosure [Abstract]
Amounts included in inventoried contract costs at beginning of the period	$ 115	$ 105	$ 110	$ 91
IRAD and B&P costs	66	83	219	254
Other G&A costs	218	213	655	647
Total contract costs incurred	284	296	874	901
Amounts charged to cost of sales	(273)	(289)	(858)	(880)
Amounts included in inventoried contract costs at end of the period	$ 126	$ 112	$ 126	$ 112