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COVER PAGE - USD ($)
 6 Months Ended
Jan. 03, 2020
Feb. 28, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-KT    
Document Annual Report false    
Document Period End Date Jan. 03, 2020    
Document Transition Report true    
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    
Entity Well-known Seasoned Issuer Yes    
Title of 12(b) Security Common Stock, par value $1.00 per share    
Trading Symbol LHX    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 22,330,592,127
Entity Common Stock, Shares Outstanding   216,896,195  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2020 Annual Meeting of Shareholders scheduled to be held on April 24, 2020, which will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s Fiscal Transition Period, are incorporated by reference into Part III of this Transition Report on Form 10-KT to the extent described therein.
    
Entity Central Index Key 0000202058    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --01-03    
Document Period Start Date Jun. 29, 2019