Segment Information (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment	Dec. 31, 2013	Dec. 31, 2012
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Number of reportable segments									4
Total sales	$ 6,108	$ 5,984	$ 6,039	$ 5,848	$ 6,157	$ 6,106	$ 6,294	$ 6,104	$ 23,979	$ 24,661	$ 25,218
Operating income	762	769	820	845	768	790	806	759	3,196	3,123	3,130
Operating Segments
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									3,099	3,080	3,176
Operating Segments | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									9,997	10,014	9,977
Operating income									1,315	1,215	1,218
Operating Segments | Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									6,951	7,149	6,950
Operating income									1,148	1,226	1,187
Operating Segments | Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									6,222	6,596	7,356
Operating income									611	633	761
Operating Segments | Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									2,799	2,843	3,019
Operating income									261	262	268
Intersegment Eliminations [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									1,990	1,941	2,084
Operating income									236	256	258
Intersegment Eliminations [Member] | Aerospace Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									176	149	171
Operating income									22	18	20
Intersegment Eliminations [Member] | Electronic Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									637	629	607
Operating income									109	125	110
Intersegment Eliminations [Member] | Information Systems
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									537	504	682
Operating income									57	63	78
Intersegment Eliminations [Member] | Technical Services
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Total sales									640	659	624
Operating income									48	50	50
Net FAS/CAS pension adjustment Income (Expense) [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									269	168	132
Corporate, Non-Segment [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									(169)	(119)	(168)
Segment Reconciling Items [Member]
Sales and Service Revenues by Segment (Table Amounts) [Abstract]
Operating income									$ (3)	$ (6)	$ (10)