Acquisitions (Rollforward of Goodwill by Segments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Roll Forward]
Beginning balance	$ 12,756	$ 12,544
Increase for acquisitions	10	212
Effect of foreign exchange rates and other	(2)	0
Ending Balance	12,764	12,756
Integrated Defense Systems
Goodwill [Roll Forward]
Beginning balance	1,799	1,797
Increase for acquisitions	0	2
Effect of foreign exchange rates and other	1	0
Ending Balance	1,800	1,799
Intelligence, Information and Services [Member]
Goodwill [Roll Forward]
Beginning balance	2,699	2,686
Increase for acquisitions	12	13
Effect of foreign exchange rates and other	(3)	0
Ending Balance	2,708	2,699
Missile Systems
Goodwill [Roll Forward]
Beginning balance	4,150	4,150
Increase for acquisitions	0	0
Effect of foreign exchange rates and other	0	0
Ending Balance	4,150	4,150
Space and Airborne Systems
Goodwill [Roll Forward]
Beginning balance	4,108	3,911
Increase for acquisitions	(2)	197
Effect of foreign exchange rates and other	0	0
Ending Balance	$ 4,106	$ 4,108