Divestitures and Acquisitions - Statement of Operations Data Classified as Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 23, 2016	Sep. 25, 2015	Sep. 23, 2016	Sep. 25, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of income taxes		$ (424)	$ 63	$ (416)
NSS [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		271	86	773
Cost of sales		(260)	(92)	(736)
Gain related to business divestiture			64
Goodwill impairment charges		(456)		(456)
Operating (loss) income from discontinued operations		(445)	58	(419)
Interest expense allocated to discontinued operations		(4)		(15)
(Loss) income from discontinued operations before income taxes		(449)	58	(434)
Income tax benefit		25	5	18
(Loss) income from discontinued operations, net of income taxes		$ (424)	$ 63	$ (416)