Segment Information (Unaudited) (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014
Segment Reporting Information [Line Items]
Number of reportable segments	4
Sales	$ 5,957	$ 5,848
Operating income	780	845
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	735	757
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,498	2,420
Operating income	315	324
Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,681	1,644
Operating income	247	268
Operating Segments [Member] | Information Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,574	1,577
Operating income	166	162
Operating Segments [Member] | Technical Services [Member]
Segment Reporting Information [Line Items]
Sales	770	697
Operating income	68	68
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	566	490
Operating income	61	65
Net FAS/CAS pension adjustment Income (Expense) [Member]
Segment Reporting Information [Line Items]
Operating income	83	110
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	$ (38)	$ (22)