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		9 Months Ended
	Sep. 29, 2023	Sep. 30, 2022	Sep. 29, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 22	$ 23	$ 67	$ 92
Common stock issued, net of shares withheld for tax purposes (in shares)	0.1	0.1	0.5	0.7