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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Jul. 03, 2020
Sep. 27, 2019
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Apr. 03, 2020
Finite-Lived Intangible Assets [Line Items]            
Non-cash goodwill impairment charge   $ 0   $ 369,000,000    
Impairment of long-lived assets $ 0          
Aviation Systems            
Finite-Lived Intangible Assets [Line Items]            
Non-cash goodwill impairment charge       364,000,000    
Disposal Group, Held-for-sale, Not Discontinued Operations | Other AS Disposal Groups | Aviation Systems            
Finite-Lived Intangible Assets [Line Items]            
Goodwill assigned to disposal group 14,000,000     14,000,000    
L3Harris            
Finite-Lived Intangible Assets [Line Items]            
Amortization expense for intangible assets 209,000,000     367,000,000    
Exelis            
Finite-Lived Intangible Assets [Line Items]            
Amortization expense for intangible assets     $ 27,000,000   $ 56,000,000  
Commercial Aviation Solutions            
Finite-Lived Intangible Assets [Line Items]            
Non-cash goodwill impairment charge 54,000,000         $ 296,000,000
Goodwill impairment loss attributable to noncontrolling interests 8,000,000         $ 28,000,000
Impairment of long-lived assets       $ 0    
Aviation Systems | Disposal Group, Held-for-sale, Not Discontinued Operations | Other AS Disposal Groups            
Finite-Lived Intangible Assets [Line Items]            
Non-cash goodwill impairment charge $ 14,000,000