Segment Information (Details) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 24, 2010	Sep. 24, 2010	Sep. 30, 2011		Dec. 31, 2010
Net Sales:
Net sales	$ 3,787		$ 3,835	$ 11,425	$ 11,154
Operating Income:
Operating income	406		437	1,289	1,200
Depreciation and amortization:
Depreciation and amortization	58		62	170	181
Total Assets:
Total Assets	15,453	[1]			15,453	[1]	15,451
C3ISR [Member]
Net Sales:
Net sales	895		797	2,397	2,531
Operating Income:
Operating income	103		84	289	288
Depreciation and amortization:
Depreciation and amortization	12		12	33	35
Total Assets:
Total Assets	2,074				2,074		2,049
Government Services [Member]
Net Sales:
Net sales	905		996	2,908	2,793
Operating Income:
Operating income	75		92	249	216
Depreciation and amortization:
Depreciation and amortization	8		9	27	25
Total Assets:
Total Assets	3,172				3,172		3,212
AM&M [Member]
Net Sales:
Net sales	671		772	2,316	1,975
Operating Income:
Operating income	61		54	172	183
Depreciation and amortization:
Depreciation and amortization	4		5	14	13
Total Assets:
Total Assets	2,039				2,039		1,962
Electronic Systems [Member]
Net Sales:
Net sales	1,401		1,379	4,141	4,125
Operating Income:
Operating income	167		207	579	513
Depreciation and amortization:
Depreciation and amortization	34		36	96	108
Total Assets:
Total Assets	7,836				7,836		7,677
Elimination of intercompany sales [Member]
Net Sales:
Net sales	(85)		(109)	(337)	(270)
Corporate [Member]
Total Assets:
Total Assets	$ 332				$ 332		$ 551

[1] Unaudited