Inventoried Costs, Net (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Production costs of contracts in process	$ 1,593	$ 1,629
General and administrative expenses	262	221
Inventoried costs	1,855	1,850
Progress payments received	(1,167)	(1,100)
Inventoried costs, net of progress payments	688	750
Product inventory	110	123
Total inventoried costs, net	$ 798	$ 873