Goodwill and Identifiable Intangible Assets - Changes in Goodwill by Segment (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 25, 2015	Sep. 25, 2015
Goodwill [Line Items]
Balance, Beginning		$ 7,501
Business acquisitions		188
Business divestitures		(12)
Impairment charge	$ (491)	(491)
Foreign currency translation adjustments		(74)
Balance, Ending	7,112	7,112
Electronic Systems [Member]
Goodwill [Line Items]
Balance, Beginning		3,773
Business acquisitions		177
Business divestitures		$ (12)
Impairment charge
Foreign currency translation adjustments		$ (43)
Balance, Ending	3,895	3,895
Aerospace Systems [Member]
Goodwill [Line Items]
Balance, Beginning		$ 1,730
Business acquisitions
Business divestitures
Impairment charge
Foreign currency translation adjustments		$ (31)
Balance, Ending	1,699	1,699
Communication Systems [Member]
Goodwill [Line Items]
Balance, Beginning		992
Business acquisitions		$ 11
Business divestitures
Impairment charge
Foreign currency translation adjustments
Balance, Ending	1,003	$ 1,003
NSS [Member]
Goodwill [Line Items]
Balance, Beginning	1,006	$ 1,006
Business acquisitions
Business divestitures
Impairment charge	(491)	$ (491)
Foreign currency translation adjustments
Balance, Ending	$ 515	$ 515