CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Oct. 01, 2021	Sep. 30, 2022	Oct. 01, 2021
Income Statement [Abstract]
Revenue from product sales and services	$ 4,246	$ 4,229	$ 12,484	$ 13,464
Cost of product sales and services	(3,052)	(2,921)	(8,819)	(9,385)
Engineering, selling and administrative expenses	(742)	(793)	(2,231)	(2,485)
Business divestiture-related gains, net	0	27	0	192
Impairment of goodwill and other assets	(802)	0	(802)	(207)
Non-operating income, net	99	111	313	314
Interest expense, net	(70)	(67)	(205)	(198)
(Loss) income from continuing operations before income taxes	(321)	586	740	1,695
Income taxes	20	(107)	(96)	(336)
(Loss) income from continuing operations	(301)	479	644	1,359
Discontinued operations, net of income taxes	0	0	0	(1)
Net (loss) income	(301)	479	644	1,358
Noncontrolling interests, net of income taxes	1	2	2	4
Net (loss) income attributable to L3Harris Technologies, Inc.	(300)	481	646	1,362
Amount attributable to L3Harris Technologies, Inc. common shareholders, basic
Net income (loss) from continuing operations, basic	(300)	481	646	1,363
Discontinued operations, net of income taxes, basic	0	0	0	(1)
Net Income (Loss), basic	(300)	481	646	1,362
Amount attributable to L3Harris Technologies, Inc. common shareholders, diluted
Net income (loss) from continuing operations, diluted	(300)	481	646	1,363
Discontinued operations, net of income taxes, diluted	0	0	0	(1)
Net Income (Loss), diluted	$ (300)	$ 481	$ 646	$ 1,362
Net (loss) income per common share attributable to L3Harris Technologies, Inc. common shareholders
Basic (in dollars per share)	$ (1.56)	$ 2.41	$ 3.36	$ 6.70
Diluted (in dollars per share)	$ (1.56)	$ 2.39	$ 3.33	$ 6.64
Basic weighted average common shares outstanding (in shares)	191.3	199.5	192.2	203.3
Diluted weighted average common shares outstanding (in shares)	191.3	201.6	194.0	205.2