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BUSINESS COMBINIATION - Calculation of Consideration Transferred (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 29, 2019 USD ($) $ / shares shares | Jan. 03, 2020 USD ($) shares | Jun. 28, 2019 USD ($) shares | Jun. 29, 2018 USD ($) shares | Jun. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Common shares, outstanding (in shares) | shares |  | 218,226,614 | 118,552,599 | 118,280,120 |
Less cash acquired |  | $ (1,130) | $ 0 | $ 0 | $ 0
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 common stock as of the closing date (in dollars per share) | $ / shares | $ 189.13 |  |  |  |
Fair value of Harris common stock issued for Exelis common stock | $ 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 Stock Units |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of Harris common stock issued for Exelis common stock | 10 |  |  |  |
L3Harris | Stock Options |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of Harris common stock issued for Exelis common stock | $ 101 |  |  |  |
L3Harris | L3 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Common shares, outstanding (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 Stock Units |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 410,000 |  |  |  |
L3Harris | L3 | Performance Share Units |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
L3 shares settled in shares of L3Harris common stock (in shares) | shares | 40,000.00 |  |  |  |

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