Segment Information (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 segment	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of reportable segments	4
Sales	$ 5,848	$ 6,104
Net FAS/CAS pension adjustment	110	33
Unallocated corporate expenses	(22)	(19)
Other	0	(3)
Operating income	845	759
Aerospace Systems
Segment Reporting Information [Line Items]
Sales	2,420	2,485
Operating income	324	270
Electronic Systems
Segment Reporting Information [Line Items]
Sales	1,644	1,721
Operating income	268	296
Information Systems
Segment Reporting Information [Line Items]
Sales	1,577	1,674
Operating income	162	171
Technical Services
Segment Reporting Information [Line Items]
Sales	697	717
Operating income	68	65
Intersegment eliminations
Segment Reporting Information [Line Items]
Sales	(490)	(493)
Operating income	(65)	(54)
Total segment operating income
Segment Reporting Information [Line Items]
Operating income	$ 757	$ 748