Segment Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 segment	Jun. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments			4
Sales	$ 6,294	$ 6,274	$ 12,398	$ 12,472
Net FAS/CAS pension adjustment	31	35	64	67
Unallocated corporate expenses	(21)	(39)	(40)	(62)
Other	(1)	(4)	(4)	(6)
Operating income	806	774	1,565	1,570
Aerospace Systems
Segment Reporting Information [Line Items]
Sales	2,613	2,404	5,098	4,787
Operating income	336	292	606	571
Electronic Systems
Segment Reporting Information [Line Items]
Sales	1,771	1,744	3,492	3,468
Operating income	322	276	618	580
Information Systems
Segment Reporting Information [Line Items]
Sales	1,689	1,856	3,363	3,700
Operating income	141	202	312	407
Technical Services
Segment Reporting Information [Line Items]
Sales	722	783	1,439	1,533
Operating income	69	74	134	144
Intersegment eliminations
Segment Reporting Information [Line Items]
Sales	(501)	(513)	(994)	(1,016)
Operating income	(71)	(62)	(125)	(131)
Total segment operating income
Segment Reporting Information [Line Items]
Operating income	$ 797	$ 782	$ 1,545	$ 1,571