Segment Information (Details) (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Segment Reporting Information [Line Items]
Number of Operating Segments	4
Goodwill Transferred	$ 51
Sales	6,198	6,734
Operating income	796	811
Unallocated corporate expenses	(23)	(10)
Net pension adjustment	32	103
Royalty income adjustment	(2)	(3)
Missile Business [Member]
Segment Reporting Information [Line Items]
Sales		143
Operating income		14
Aerospace Systems
Segment Reporting Information [Line Items]
Sales	2,383	2,593
Operating income	279	287
Electronic Systems
Segment Reporting Information [Line Items]
Sales	1,724	1,808
Operating income	304	237
Information Systems
Segment Reporting Information [Line Items]
Sales	1,844	2,025
Operating income	205	194
Technical Services
Segment Reporting Information [Line Items]
Sales	750	831
Operating income	70	68
Intersegment eliminations
Segment Reporting Information [Line Items]
Sales	(503)	(523)
Operating income	(69)	(65)
Change In Cost Of Goods Sold		161
Total segment operating income [Member]
Segment Reporting Information [Line Items]
Operating income	$ 789	$ 721