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		6 Months Ended
	Jun. 30, 2023	Jul. 01, 2022	Jun. 30, 2023	Jul. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 22	$ 41	$ 45	$ 69
Common stock issued, net of shares withheld for tax purposes (in shares)	0.1	0.2	0.4	0.6