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BUSINESS COMBINIATION - Additional Information (Details) $ / shares in Units, shares in Thousands, employee in Thousands, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 employee $ / shares shares | Jan. 03, 2020 USD ($) employee | Dec. 31, 2018 USD ($) | Jun. 29, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |
Number of employees | employee |  | 50 |  |
Restructuring charges |  | $ 117 |  | $ 51
Workforce reduction |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restructuring charges |  | 117 |  | $ 1
L3Harris |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange ratio | 1.30 |  |  |
Shares issued for total merger consideration (in shares) | shares | 104,100 |  |  |
Price per share of common stock (in dollars per share) | $ / shares | $ 189.13 |  |  |
Merger-related charges |  | 532 |  |
Additional cost of sales related to fair value step-up in inventory sold |  | 142 |  |
Restructuring charges |  | 117 |  |
Transaction costs |  | 83 |  |
Integration costs |  | 72 |  |
Equity acceleration upon change in control |  | 70 |  |
Facility consolidation costs |  | 48 |  |
L3Harris | L3 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of employees | employee | 31 |  |  |
Revenue from product sales and services — pro forma |  |  | $ 10,000 |
Shares issued for total merger consideration (in shares) | shares | 80,080 |  |  |
Net revenues from acquiree for the reporting period |  | 5,700 |  |
Income from continuing operations before income taxes of acquiree for the reporting period |  | 400 |  |
L3Harris | L3 | Workforce reduction |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Restructuring charges |  | $ 108 |  |
L3Harris | Former Harris Shareholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired | 54.00% |  |  |
L3Harris | Former L3 Shareholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired | 46.00% |  |  |

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