Segment Information (Unaudited) (Details 1) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Sales	$ 6,000	$ 5,896	$ 11,956	$ 11,853
Operating income	797	813	1,536	1,593
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	731	742	1,432	1,477
Operating Segments [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Sales	2,600	2,498	5,174	4,996
Operating income	312	319	598	631
Operating Segments [Member] | Mission Systems [Member] [Member]
Segment Reporting Information [Line Items]
Sales	2,690	2,628	5,383	5,339
Operating income	351	348	704	692
Operating Segments [Member] | Technology Services [Member]
Segment Reporting Information [Line Items]
Sales	1,213	1,238	2,427	2,505
Operating income	131	128	257	261
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales	503	468	1,028	987
Operating income	63	53	127	107
Net FAS/CAS pension adjustment Income (Expense) [Member]
Segment Reporting Information [Line Items]
Operating income	69	81	143	164
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating income	(3)	(9)	(36)	(47)
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Operating income	$ 0	$ (1)	$ (3)	$ (1)