Cost Of Contracts (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Contractors [Abstract]
Contract costs and estimated profits	$ 8,871	$ 8,162
Other contract costs	1,148	1,089
Costs in excess of billings on uncompleted contracts or programs, total	10,019	9,251
Advances and progress payments	(4,909)	(4,287)
Total contracts in process	$ 5,110	$ 4,964