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		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Inventory Disclosure [Abstract]
Amounts included in inventoried contract costs at beginning of the period	$ 113	$ 100	$ 110	$ 91
Add: IRAD and B&P costs	80	89	153	171
Other G&A costs	232	221	437	434
Total contract costs incurred	312	310	590	605
Less: Amounts charged to cost of sales	(310)	(305)	(585)	(591)
Amounts included in inventoried contract costs at end of the period	$ 115	$ 105	$ 115	$ 105