| Cover Page | Mar. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 1, 2021 |
| Entity Registrant Name | L3HARRIS TECHNOLOGIES, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-3863 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $1.00 per share |
| Trading Symbol | LHX |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000202058 |
| Amendment Flag | false |
