v3.26.3
SHARE-BASED COMPENSATION - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 02, 2026
Oct. 03, 2025
Oct. 02, 2026
Oct. 03, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based payment arrangement, expense $ (1) $ 35 $ 48 $ 83
Shares forfeited $ 20   $ 20  
Shares forfeited (in shares)     0.1  
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 0.7 0.6 1.1