STOCK OPTIONS AND OTHER SHARE-BASED COMPENSATION - Narrative (Details) - L3Harris Shareholder-approved Employee Stock Incentive Plans - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 29, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 26	$ 23
Common stock issued, net of shares withheld for tax purposes (in shares)	0.5	0.3