Acquisitions and Divestitures - Operating Results Reflected within Earnings from Discontinued Operations, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 24, 2017	Jun. 25, 2017	Mar. 26, 2017	Dec. 31, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net earnings from discontinued operations	$ 73	$ 0	$ 0	$ 0	$ 29	$ 1,306	$ 122	$ 92	$ 73	$ 1,549	$ 479
Discontinued Operations, Disposed of by Sale | Information Systems & Global Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales										3,410	5,596
Cost of sales										(2,953)	(4,868)
Severance charges										(19)	(20)
Gross profit										438	708
Other income, net										16	16
Operating profit										454	724
Earnings from discontinued operations before income taxes										454	724
Income tax expense										(147)	(245)
Net gain on divestiture of discontinued operations										1,242	0
Net earnings from discontinued operations										$ 1,549	$ 479