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Stock Options and Other Share-Based Compensation (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2021
USD ($)
plan
shares
Oct. 02, 2020
USD ($)
Oct. 01, 2021
USD ($)
plan
shares
Oct. 02, 2020
USD ($)
shares
SIPs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shareholder approved employee stock incentive plans | plan 2   2  
L3Harris SIPs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation costs related to share-based awards | $ $ 33 $ 31 $ 100 $ 71
Common stock issued, net of shares withheld for tax purposes (in shares) 0.7   1.2 0.5
Stock options granted (in shares)     0.5  
L3Harris SIPs | Performance Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     0.2  
L3Harris SIPs | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares)     0.3  
L3Harris SIPs | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield     1.99%  
Expected volatility     31.71%  
Risk free interest rates     0.75%  
Expected term     5 years 18 days