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COVER - USD ($)
 12 Months Ended
Dec. 29, 2023
Feb. 09, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 29, 2023    
Current Fiscal Year End Date --12-29    
Document Transition Report false    
Entity File Number 1-3863    
Entity Registrant Name L3HARRIS TECHNOLOGIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 34-0276860    
Entity Address, Address Line One 1025 West NASA Boulevard    
Entity Address, City or Town Melbourne,    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 32919    
City Area Code 321    
Local Phone Number 727-9100    
Title of 12(b) Security Common Stock, par value $1.00 per share    
Trading Symbol LHX    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 37,362,290,944
Entity Common Stock, Shares Outstanding   190,107,856  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2024 Annual Meeting of Shareholders scheduled to be held on April 19, 2024, which will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 29, 2023, are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent described therein.
    
Entity Central Index Key 0000202058    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY