| **Cover Page - shares**                     | 3 Months Ended                          |             |
|---------------------------------------------|-----------------------------------------|-------------|
||
| **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                                 |        |

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This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.
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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.
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Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.
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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
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