Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales	$ 6,476	$ 6,270	$ 6,274	$ 6,198	$ 6,506	$ 6,612	$ 6,560	$ 6,734	$ 25,218	$ 26,412	$ 28,143
Operating income	824	736	774	796	799	825	841	811	3,130	3,276	2,827
Unallocated corporate expenses									(168)	(166)	(182)
Net FAS/CAS pension adjustment									132	400	10
Other									(10)		(11)
Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									9,977	9,964	10,436
Operating income									1,218	1,217	1,213
Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									6,950	7,372	7,613
Operating income									1,187	1,070	1,023
Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									7,356	7,921	8,395
Operating income									761	766	756
Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									3,019	3,193	3,705
Operating income									268	260	249
Intersegment eliminations
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									(2,084)	(2,038)	(2,006)
Operating income									(258)	(258)	(231)
Total segment operating income
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									$ 3,176	$ 3,055	$ 3,010