CONDENSED CONSOLIDATED STATEMENT OF INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2022	Jul. 02, 2021	Jul. 01, 2022	Jul. 02, 2021
Income Statement [Abstract]
Revenue from product sales and services	$ 4,135	$ 4,668	$ 8,238	$ 9,235
Cost of product sales and services	(2,907)	(3,251)	(5,767)	(6,464)
Engineering, selling and administrative expenses	(744)	(891)	(1,489)	(1,692)
Business divestiture-related gains, net	0	180	0	165
Impairment of goodwill and other assets	0	(145)	0	(207)
Non-operating income	108	86	214	203
Interest expense, net	(67)	(65)	(135)	(131)
Income from continuing operations before income taxes	525	582	1,061	1,109
Income taxes	(55)	(169)	(116)	(229)
Income from continuing operations	470	413	945	880
Discontinued operations, net of income taxes	0	0	0	(1)
Net income	470	413	945	879
Noncontrolling interests, net of income taxes	1	0	1	2
Net income attributable to L3Harris Technologies, Inc.	471	413	946	881
Amount attributable to L3Harris Technologies, Inc. common shareholders
Income from continuing operations	471	413	946	882
Discontinued operations, net of income taxes	0	0	0	(1)
Net income attributable to L3Harris Technologies, Inc.	$ 471	$ 413	$ 946	$ 881
Net income per common share attributable to L3Harris Technologies, Inc. common shareholders
Basic (in dollars per share)	$ 2.45	$ 2.03	$ 4.91	$ 4.29
Diluted
Continuing operations (in dollars per share)	2.42	2.01	4.86	4.26
Discontinued operations (in dollars per share)	0	0	0	(0.01)
Diluted (in dollars per share)	$ 2.42	$ 2.01	$ 4.86	$ 4.25
Basic weighted average common shares outstanding (in shares)	192,100,000	203,600,000	192,600,000	205,200,000
Diluted weighted average common shares outstanding (in shares)	194,000,000.0	205,600,000	194,500,000	207,100,000