Segment Information (Unaudited) (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Segment Reporting Information [Line Items]
Number of reportable segments			4
Sales	$ 5,984	$ 6,106	$ 17,871	$ 18,504
Operating income	769	790	2,434	2,355
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	840	763	2,339	2,308
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,543	2,484	7,465	7,582
Operating income	402	330	1,016	936
Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,733	1,774	5,121	5,266
Operating income	274	273	833	891
Operating Segments [Member] | Information Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,511	1,619	4,650	4,982
Operating income	150	162	465	474
Operating Segments [Member] | Technical Services [Member]
Segment Reporting Information [Line Items]
Sales	691	713	2,120	2,152
Operating income	66	67	202	201
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	(494)	(484)	(1,485)	(1,478)
Operating income	(52)	(69)	(177)	(194)
Net FAS/CAS pension adjustment Income (Expense) [Member]
Segment Reporting Information [Line Items]
Operating income	(20)	61	200	125
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	(50)	(33)	(103)	(73)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ (1)	$ (1)	$ (2)	$ (5)