STOCK OPTIONS AND OTHER SHARE-BASED COMPENSATION - Narrative (Details) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2024 USD ($) plan shares	Jun. 30, 2023 USD ($) shares	Jun. 28, 2024 USD ($) plan shares	Jun. 30, 2023 USD ($) 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 | $	$ 27	$ 22	$ 53	$ 45
Common stock issued, net of shares withheld for tax purposes (in shares) | shares	0.3	0.1	0.8	0.4