Contracts in Process - General and Administrative, Independent Research and Development and Bids and Proposal Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Inventory Disclosure [Abstract]
Amounts included in inventoried contract costs at beginning of the period:	$ 141	$ 113	$ 138	$ 110
IRAD and B&P costs	73	80	145	153
Other G&A costs	215	232	419	437
Total contract costs incurred	288	312	564	590
Amounts charged to cost of sales	(278)	(310)	(551)	(585)
Amounts included in inventoried contract costs at end of the period	$ 151	$ 115	$ 151	$ 115