Segment Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments			4
Sales	$ 6,106	$ 6,270	$ 18,504	$ 18,742
Net FAS/CAS pension adjustment	61	34	125	101
Unallocated corporate expenses	(33)	(27)	(73)	(89)
Other	(1)	(1)	(5)	(7)
Operating income	790	736	2,355	2,306
Aerospace Systems
Segment Reporting Information [Line Items]
Sales	2,484	2,586	7,582	7,373
Operating income	330	288	936	859
Electronic Systems
Segment Reporting Information [Line Items]
Sales	1,774	1,707	5,266	5,175
Operating income	273	279	891	859
Information Systems
Segment Reporting Information [Line Items]
Sales	1,619	1,776	4,982	5,476
Operating income	162	170	474	577
Technical Services
Segment Reporting Information [Line Items]
Sales	713	748	2,152	2,281
Operating income	67	62	201	206
Intersegment eliminations
Segment Reporting Information [Line Items]
Sales	(484)	(547)	(1,478)	(1,563)
Operating income	(69)	(69)	(194)	(200)
Total segment operating income
Segment Reporting Information [Line Items]
Operating income	$ 763	$ 730	$ 2,308	$ 2,301