Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment	Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Sales	$ 5,896	$ 6,039	$ 11,853	$ 11,887
Operating income	813	820	1,593	1,665
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	742	742	1,477	1,499
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,512	2,502	5,010	4,922
Operating income	322	290	637	614
Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,683	1,744	3,364	3,388
Operating income	265	291	512	559
Operating Segments [Member] | Information Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,485	1,562	3,059	3,139
Operating income	150	153	316	315
Operating Segments [Member] | Technical Services [Member]
Segment Reporting Information [Line Items]
Sales	720	732	1,490	1,429
Operating income	67	68	135	136
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	504	501	1,070	991
Operating income	62	60	123	125
Net FAS/CAS pension adjustment Income (Expense) [Member]
Segment Reporting Information [Line Items]
Operating income	81	110	164	220
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	(9)	(31)	(47)	(53)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ (1)	$ (1)	$ (1)	$ (1)