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Business Combination - Preliminary Calculation of Estimated Consideration Transferred (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Jun. 29, 2019
USD ($)
$ / shares
shares
Sep. 27, 2019
USD ($)
shares
Sep. 28, 2018
USD ($)
Jun. 28, 2019
$ / shares
shares
Business Acquisition [Line Items]        
Outstanding shares of common stock as of June 2018, 2019 (in shares) | shares   221,568,200   118,552,599
Less cash acquired   $ (1,132) $ 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 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 Stock 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 Stock 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