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Business Combination - Additional Information (Details)
$ / shares in Units, shares in Thousands, employee in Thousands, $ in Millions
3 Months Ended 12 Months Ended
Jun. 29, 2019
employee
country
$ / shares
shares
Sep. 27, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 28, 2019
$ / shares
Business Acquisition [Line Items]        
Restructuring charges   $ 111    
Workforce Reduction        
Business Acquisition [Line Items]        
Restructuring charges   111    
L3Harris        
Business Acquisition [Line Items]        
Exchange ratio 1.30      
Number of employees | employee 50      
Number of countries in which the entity operates | country 130      
Shares issued for total merger consideration (in shares) | shares 104,100      
Price per share of common stock (in dollars per share) | $ / shares $ 189.13     $ 189.13
Merger-related charges   373    
Acquisition transaction costs   74    
Acquisition integration costs   35    
Equity acceleration upon change in control   61    
Additional cost of sales related to fair value step-up in inventory sold   92    
Restructuring charges   111    
L3Harris | Workforce Reduction        
Business Acquisition [Line Items]        
Restructuring charges   111    
L3Harris | L3        
Business Acquisition [Line Items]        
Number of employees | employee 31      
Revenues of the acquired entity for the last calendar year     $ 10,000  
Shares issued for total merger consideration (in shares) | shares 80,080      
Net revenues from acquiree for the reporting period   2,670    
Income from continuing operations before income taxes of acquiree for the reporting period   190    
L3Harris | L3 | Workforce Reduction        
Business Acquisition [Line Items]        
Restructuring charges   $ 101    
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%