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Restructuring and Other Exit Costs - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 03, 2020
Jan. 03, 2020
Jan. 01, 2021
Apr. 02, 2021
Restructuring Cost and Reserve [Line Items]        
Restructuring liabilities     $ 34 $ 24
Workforce Reduction | COVID-19        
Restructuring Cost and Reserve [Line Items]        
Restructuring liabilities       7
Workforce Reduction | COVID-19 | Aviation Systems        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 3   15  
Workforce Reduction | L3Harris        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges   $ 117 $ 10  
Restructuring liabilities       $ 17