| **Cover Page**                              | May 04, 2020                            |
|---------------------------------------------|-----------------------------------------|
| **Cover page.**                             |                                    |
| Document Type                               | 8-K                                     |
| Document Period End Date                    | May  04,  2020                          |
| 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                                   |

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