Goodwill and Identifiable Intangible Assets - Changes in Goodwill by Segment (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 28, 2013
Goodwill [Line Items]
Balance, Beginning	$ 7,744
Business dispositions	(2)
Foreign currency translation adjustments	(40)
Balance, Ending	7,702
C3ISR [Member]
Goodwill [Line Items]
Balance, Beginning	797
Business dispositions
Foreign currency translation adjustments
Balance, Ending	797
Electronic Systems [Member]
Goodwill [Line Items]
Balance, Beginning	4,804
Business dispositions	(2)
Foreign currency translation adjustments	(26)
Balance, Ending	4,776
P&LS [Member]
Goodwill [Line Items]
Balance, Beginning	1,175
Business dispositions
Foreign currency translation adjustments	(13)
Balance, Ending	1,162
NSS [Member]
Goodwill [Line Items]
Balance, Beginning	968
Business dispositions
Foreign currency translation adjustments	(1)
Balance, Ending	$ 967