STOCK OPTIONS AND OTHER SHARE-BASED COMPENSATION - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024 USD ($) plan shares	Sep. 29, 2023 USD ($) shares	Sep. 27, 2024 USD ($) plan shares	Sep. 29, 2023 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shareholder approved employee stock incentive plans | plan	3		3
L3Harris Shareholder-approved Employee Stock Incentive Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense | $	$ 23	$ 22	$ 76	$ 67
Common stock issued, net of shares withheld for tax purposes (in shares) | shares	0.4	0.1	1.2	0.5