Goodwill and Acquired Intangibles (Detail) $ in Millions	9 Months Ended
	Sep. 25, 2016 USD ($)
Goodwill [Line Items]
Goodwill, beginning balance	$ 10,695
Purchase accounting adjustments	89
Divestitures	(7)
Foreign currency translation	14
Goodwill, ending balance	10,791
Aeronautics
Goodwill [Line Items]
Goodwill, beginning balance	171
Goodwill, ending balance	171
Missiles and Fire Control
Goodwill [Line Items]
Goodwill, beginning balance	2,198
Foreign currency translation	(8)
Goodwill, ending balance	2,190
Rotary and Mission Systems
Goodwill [Line Items]
Goodwill, beginning balance	6,738
Purchase accounting adjustments	89
Divestitures	(7)
Foreign currency translation	24
Goodwill, ending balance	6,844
Space Systems
Goodwill [Line Items]
Goodwill, beginning balance	1,588
Foreign currency translation	(2)
Goodwill, ending balance	$ 1,586