Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net Sales
Products									$ 7,563	$ 7,596	$ 7,516
Services									7,606	8,084	8,099
Net Sales									15,169	15,680	15,615
Operating Income
Operating income	398	406	404	390	461	437	442	410	1,598	1,750	1,656
Impairment charge									43
Depreciation and amortization
Depreciation and amortization									247	231	218
Capital Expenditures
Capital Expenditures									192	181	186
Total Assets
Total Assets	15,497				15,451				15,497	15,451	14,875
C3ISR [Member]
Net Sales
Products									2,093	1,978	2,082
Services									1,488	1,390	1,009
Operating Income
Operating income									409	391	339
Depreciation and amortization
Depreciation and amortization									47	45	43
Capital Expenditures
Capital Expenditures									72	64	60
Total Assets
Total Assets	2,145				2,049				2,145	2,049	1,855
Government Services [Member]
Net Sales
Products									164	203	174
Services									3,461	3,732	3,947
Operating Income
Operating income									280	342	383
Depreciation and amortization
Depreciation and amortization									35	36	38
Capital Expenditures
Capital Expenditures									10	7	11
Total Assets
Total Assets	3,072				3,212				3,072	3,212	3,151
AM&M [Member]
Net Sales
Products									751	811	688
Services									1,898	2,220	2,260
Operating Income
Operating income									232	229	243
Depreciation and amortization
Depreciation and amortization									19	19	19
Capital Expenditures
Capital Expenditures									13	6	15
Total Assets
Total Assets	1,922				1,962				1,922	1,962	1,915
Electronic Systems [Member]
Net Sales
Products									4,649	4,761	4,867
Services									1,037	1,020	1,111
Operating Income
Operating income									720	788	691
Impairment charge									43
Depreciation and amortization
Depreciation and amortization									146	131	118
Capital Expenditures
Capital Expenditures									96	104	96
Total Assets
Total Assets	7,431				7,677				7,431	7,677	6,752
Segment Total [Member]
Operating Income
Operating income									1,641	1,750	1,656
Elimination of intercompany sales [Member]
Net Sales
Products									(94)	(157)	(295)
Services									(278)	(278)	(228)
Corporate [Member]
Capital Expenditures
Capital Expenditures									1		4
Total Assets
Total Assets	$ 927				$ 551				$ 927	$ 551	$ 1,202