CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue from product sales and services	$ 4,915	$ 4,246	$ 14,079	$ 12,484
Cost of product sales and services	(3,608)	(3,052)	(10,371)	(8,819)
Engineering, selling and administrative expenses	(828)	(742)	(2,384)	(2,239)
Sale of asset group and business divestiture-related gains, net	0	0	26	8
Impairment of goodwill and other assets	0	(802)	(78)	(802)
Non-operating income, net	80	99	245	313
Interest expense, net	(159)	(70)	(372)	(205)
Income (loss) before income taxes	400	(321)	1,145	740
Income taxes	(18)	20	(73)	(96)
Net income (loss)	382	(301)	1,072	644
Noncontrolling interests, net of income taxes	1	1	(3)	2
Net income (loss) attributable to L3Harris Technologies, Inc.	$ 383	$ (300)	$ 1,069	$ 646
Net income (loss) per common share attributable to L3Harris Technologies, Inc. common shareholders
Basic (in dollars per share)	$ 2.02	$ (1.56)	$ 5.64	$ 3.36
Diluted (in dollars per share)	$ 2.02	$ (1.56)	$ 5.61	$ 3.33
Basic weighted average common shares outstanding (in shares)	189.3	191.3	189.6	192.2
Diluted weighted average common shares outstanding (in shares)	190.1	191.3	190.6	194.0