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Business Combination - Calculation of Consideration Transferred (Details) $ / shares in Units, $ in Millions | Jun. 29, 2019 USD ($) $ / shares shares | Jul. 03, 2020 shares | Jan. 03, 2020 shares | Jun. 28, 2019 $ / shares shares
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Outstanding shares of common stock as of June 2018, 2019 (in shares) | shares |  | 216,087,421 | 218,226,614 |
L3Harris |  |  |  |
Business Acquisition [Line Items] |  |  |  |
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 104,100,000 |  |  |
Exchange Ratio | 1.30 |  |  |
Price per share of L3Harris common stock as of June 28, 2019 (in dollars per share) | $ / shares | $ 189.13 |  |  | $ 189.13
Fair value of stock options and other share-based awards | $ 19,689 |  |  |
Withholding tax liability incurred for converted L3 share-based awards | 45 |  |  |
Fair value of replacement award consideration | 156 |  |  |
Fair value of total consideration | 19,845 |  |  |
Less cash acquired | (1,195) |  |  |
Total net consideration transferred | 18,650 |  |  |
L3Harris | Restricted Sock Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of stock options and other share-based awards | 10 |  |  |
L3Harris | Stock Options |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of stock options and other share-based awards | $ 101 |  |  |
L3Harris | L3 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Outstanding shares of common stock as of June 2018, 2019 (in shares) | shares |  |  |  | 79,630,000
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 80,080,000.00 |  |  |
L3Harris | L3 | Restricted Sock Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 410,000 |  |  |
L3Harris | L3 | Performance Stock Units |  |  |  |
Business Acquisition [Line Items] |  |  |  |
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 40,000.00 |  |  |

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