UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Net sales:
Total sales	$ 2,700	$ 2,371
Operating costs and expenses:
General and administrative expenses	(382)	(397)
Total operating costs and expenses	(2,389)	(2,120)
Merger, acquisition and divestiture related expenses and losses	(18)	0
Operating income	293	251
Interest expense	(37)	(41)
Interest and other income, net	4	6
Income from continuing operations before income taxes	260	216
Provision for income taxes	(37)	(24)
Income from continuing operations	223	192
Income from discontinued operations, net of income taxes	0	16
Net income	223	208
Net income from continuing operations attributable to noncontrolling interests	(6)	(5)
Net income attributable to L3	$ 217	$ 203
Basic earnings per share attributable to common shareholders:
Continuing operations (in dollars per share)	$ 2.74	$ 2.40
Discontinued operations (in dollars per share)	0.00	0.20
Basic earnings per share (in dollars per share)	2.74	2.60
Diluted earnings per share attributable to common shareholders:
Continuing operations (in dollars per share)	2.71	2.34
Discontinued operations (in dollars per share)	0.00	0.20
Diluted earnings per share (in dollars per share)	2.71	2.54
Cash dividends declared per common share (in dollars per share)	$ 0.85	$ 0.8
Weighted average common shares outstanding:
Basic (in shares)	79.2	78.2
Diluted (in shares)	80.0	79.9
Product [Member]
Net sales:
Total sales	$ 1,932	$ 1,646
Operating costs and expenses:
Cost of Goods and services sold	(1,442)	(1,191)
Service [Member]
Net sales:
Total sales	768	725
Operating costs and expenses:
Cost of Goods and services sold	$ (565)	$ (532)