Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			4
Sales	$ 5,979	$ 5,984	$ 17,832	$ 17,871
Operating income	794	769	2,387	2,434
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	726	840	2,203	2,339
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,563	2,543	7,573	7,465
Operating income	303	402	940	1,016
Operating Segments [Member] | Electronic Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,767	1,733	5,131	5,121
Operating income	275	274	787	833
Operating Segments [Member] | Information Systems [Member]
Segment Reporting Information [Line Items]
Sales	1,472	1,511	4,531	4,650
Operating income	146	150	462	465
Operating Segments [Member] | Technical Services [Member]
Segment Reporting Information [Line Items]
Sales	695	691	2,185	2,120
Operating income	64	66	199	202
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	518	494	1,588	1,485
Operating income	62	52	185	177
Net FAS/CAS pension adjustment Income (Expense) [Member]
Segment Reporting Information [Line Items]
Operating income	97	(20)	261	200
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	(29)	(50)	(76)	(103)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ 0	$ (1)	$ (1)	$ (2)