Inventoried Costs, Net (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Inventoried Costs Table [Abstract]
Production costs of contracts in process	$ 1,629	$ 1,521
General and administrative expenses	221	190
Inventoried costs	1,850	1,711
Progress payments received	(1,100)	(962)
Inventoried costs, net of progress payments	750	749
Product inventory	123	147
Total inventoried costs, net	$ 873	$ 896