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BUSINESS COMBINATION - Narrative (Details) $ / shares in Units, shares in Thousands, employee in Thousands, $ in Millions |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 29, 2019 USD ($) employee shares | Jan. 03, 2020 USD ($) | Dec. 31, 2021 USD ($) employee | Jan. 01, 2021 USD ($) | Dec. 31, 2018 USD ($) | Jun. 28, 2019 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Number of employees | employee |  |  | 47 |  |  |
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
Net liability off-market customer contracts | $ 139 |  |  |  |  |
Revenue from amortization of off-market contract liability |  | $ 13 | $ 20 | $ 58 |  |
Future estimated revenue from amortization of net off-market contract liabilities in 2022 |  |  | 15 |  |  |
Future estimated revenue from amortization of net off-market contract liabilities in 2023 |  |  | 10 |  |  |
Future estimated revenue from amortization of net off-market contract liabilities in 2024 |  |  | $ 23 |  |  |
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 |  |  |  |  |
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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