CONDENSED CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Apr. 03, 2020	Mar. 29, 2019
Income Statement [Abstract]
Revenue from product sales and services	$ 4,626	$ 1,728
Cost of product sales and services	(3,298)	(1,139)
Engineering, selling and administrative expenses	(815)	(310)
Impairment of goodwill and other assets	(324)	0
Non-operating income	95	46
Interest income	5	1
Interest expense	(68)	(43)
Income from continuing operations before income taxes	221	283
Income taxes	(26)	(40)
Income from continuing operations	195	243
Discontinued operations, net of income taxes	(1)	0
Net income	194	243
Noncontrolling interests, net of income taxes	23	0
Net income attributable to L3Harris Technologies, Inc.	217	243
Amounts attributable to L3Harris Technologies, Inc. common shareholders
Income from continuing operations	218	243
Discontinued operations, net of income taxes	$ (1)	$ 0
Basic
Continuing operations (in dollars per share)	$ 1.00	$ 2.06
Discontinued operations (in dollars per share)	0	0
Basic (in dollars per share)	1.00	2.06
Diluted
Continuing operations (in dollars per share)	0.99	2.02
Discontinued operations (in dollars per share)	0	0
Diluted (in dollars per share)	$ 0.99	$ 2.02
Basic weighted average common shares outstanding (in shares)	217.3	117.9
Diluted weighted average common shares outstanding (in shares)	219.3	120.3