Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 29, 2012		Jul. 01, 2011	Jun. 29, 2012		Jul. 01, 2011	Dec. 31, 2011
Net Sales:
Net Sales	$ 3,558		$ 3,766	$ 7,146		$ 7,367
Operating Income:
Operating income	367		404	724		794
Engility spin-off transaction expenses	7			13
Depreciation and amortization:
Depreciation and amortization	60		64	119		123
Total Assets:
Total Assets	15,725	[1]		15,725	[1]		15,497
C3ISR [Member]
Net Sales:
Net Sales	864		828	1,753		1,598
Operating Income:
Operating income	87		94	181		187
Depreciation and amortization:
Depreciation and amortization	12		11	23		22
Total Assets:
Total Assets	2,149			2,149			2,021
Electronic Systems [Member]
Net Sales:
Net Sales	1,405		1,434	2,759		2,762
Operating Income:
Operating income	173		184	326		344
Depreciation and amortization:
Depreciation and amortization	36		39	72		75
Total Assets:
Total Assets	7,931			7,931			7,555
AM&M [Member]
Net Sales:
Net Sales	648		661	1,318		1,304
Operating Income:
Operating income	52		56	115		122
Depreciation and amortization:
Depreciation and amortization	6		5	11		9
Total Assets:
Total Assets	2,113			2,113			1,922
Government Services [Member]
Net Sales:
Net Sales	754		940	1,531		1,888
Operating Income:
Operating income	62		70	115		141
Depreciation and amortization:
Depreciation and amortization	6		9	13		17
Total Assets:
Total Assets	3,041			3,041			3,072
Segment Total [Member]
Operating Income:
Operating income	374		404	737		794
Elimination of intercompany sales [Member]
Net Sales:
Net Sales	(113)		(97)	(215)		(185)
Total Assets:
Total Assets	$ 491			$ 491			$ 927

[1] Unaudited