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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