v3.26.1
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jul. 03, 2026
Jun. 27, 2025
Jul. 03, 2026
Jun. 27, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, expense $ 28 $ 29 $ 49 $ 48
L3Harris Shareholder-approved Employee Stock Incentive Plans        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock issued, net of shares withheld for tax purposes (in shares) 0.1 0.2 0.5 0.4