Segment Information (Details 1) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Number of reportable segments									4
Total sales	$ 5,694	$ 5,979	$ 5,896	$ 5,957	$ 6,108	$ 5,984	$ 6,039	$ 5,848	$ 23,526	$ 23,979	$ 24,661
Operating income	$ 689	$ 794	$ 813	$ 780	$ 762	$ 769	$ 820	$ 845	3,076	3,196	3,123
Operating Segments
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									2,920	3,099	3,080
Operating Segments | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									10,004	9,997	10,014
Operating income									1,220	1,315	1,215
Operating Segments | Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									6,842	6,951	7,149
Operating income									1,068	1,148	1,226
Operating Segments | Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									5,894	6,222	6,596
Operating income									616	611	633
Operating Segments | Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									2,838	2,799	2,843
Operating income									254	261	262
Intersegment Eliminations [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									2,052	1,990	1,941
Operating income									238	236	256
Intersegment Eliminations [Member] | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									232	176	149
Operating income									28	22	18
Intersegment Eliminations [Member] | Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									544	637	629
Operating income									88	109	125
Intersegment Eliminations [Member] | Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									592	537	504
Operating income									60	57	63
Intersegment Eliminations [Member] | Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									684	640	659
Operating income									62	48	50
Net FAS/CAS pension adjustment Income (Expense) [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									348	269	168
Corporate, Non-Segment [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									(190)	(169)	(119)
Segment Reconciling Items [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									$ (2)	$ (3)	$ (6)