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
	Mar. 28, 2014	Mar. 29, 2013
Inventory Disclosure [Abstract]
Amounts included in inventoried contract costs at beginning of the period	$ 138	$ 110
IRAD and B&P costs	72	73
Other G&A costs	204	205
Total contract costs incurred	276	278
Amounts charged to cost of sales	(273)	(275)
Amounts included in inventoried contract costs at end of the period	$ 141	$ 113