UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		3 Months Ended
	Jul. 19, 2017	Mar. 30, 2018	Mar. 31, 2017
Net sales:
Products		$ 1,646	$ 1,604
Services		725	717
Total net sales		2,371	2,321
Operating costs and expenses:
Cost of sales — Products		(1,191)	(1,188)
Cost of sales — Services		(532)	(538)
General and administrative expenses		(397)	(358)
Operating income		251	237
Interest expense		(41)	(42)
Interest and other income, net		6	4
Income from continuing operations before income taxes		216	199
Provision for income taxes		(24)	(42)
Income from continuing operations		192	157
Income from discontinued operations, net of income taxes		16	11
Net income		208	168
Net income from continuing operations attributable to noncontrolling interests		(5)	(4)
Net income attributable to L3		$ 203	$ 164
Basic earnings per share attributable to common shareholders:
Continuing operations (in dollars per share)		$ 2.40	$ 1.97
Discontinued operations (in dollars per share)		0.20	0.14
Basic earnings per share (in dollars per share)		2.60	2.11
Diluted earnings per share attributable to common shareholders:
Continuing operations (in dollars per share)		2.34	1.93
Discontinued operations (in dollars per share)		0.20	0.14
Diluted earnings per share (in dollars per share)		2.54	2.07
Cash dividends declared per common share (in dollars per share)	$ 0.80	$ 0.80	$ 0.75
Weighted average common shares outstanding:
Basic (in shares)		78.2	77.7
Diluted (in shares)		79.9	79.3