Cover Page - shares	3 Months Ended
	Apr. 03, 2020	May 01, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
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 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 Common Stock, Shares Outstanding		215,870,340
Entity Central Index Key	0000202058
Document Period End Date	Apr. 03, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--01-01