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DEBT - Debt Exchanged Narrative (Details) - Senior Unsecured Debt
$ in Millions
May 05, 2020
Jul. 02, 2019
USD ($)
Jul. 01, 2019
USD ($)
Dec. 14, 2020
L3Harris        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   $ 3,350    
Debt exchange to cash conversion ratio   0.001    
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”)        
Debt Instrument [Line Items]        
Percentage of debt exchanged 9990.00%      
Debt exchange, converted interest rate 4.95%      
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | L3Harris        
Debt Instrument [Line Items]        
Interest rate margin   0.25%    
Debt exchange, converted interest rate   4.95% 4.95%  
3.85% notes, due June 15, 2023        
Debt Instrument [Line Items]        
Percentage of debt exchanged 9990.00%      
Debt exchange, converted interest rate 3.85%      
3.85% notes, due June 15, 2023 | L3Harris        
Debt Instrument [Line Items]        
Debt interest rate   3.85%    
Debt instrument redemption price percentage   100.00%    
Interest rate margin   0.20%    
Debt exchange, converted interest rate   3.85% 3.85%  
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”)        
Debt Instrument [Line Items]        
Percentage of debt exchanged 9990.00%      
Debt exchange, converted interest rate 3.95%      
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | L3Harris        
Debt Instrument [Line Items]        
Debt interest rate   3.95%    
Interest rate margin   0.20%    
Debt exchange, converted interest rate   3.95% 3.95%  
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”)        
Debt Instrument [Line Items]        
Percentage of debt exchanged 9990.00%      
Debt exchange, converted interest rate 3.85%      
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | L3Harris        
Debt Instrument [Line Items]        
Debt interest rate   3.85%    
Interest rate margin   0.25%    
Debt exchange, converted interest rate   3.85% 3.85%  
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”)        
Debt Instrument [Line Items]        
Percentage of debt exchanged 9890.00%      
Debt exchange, converted interest rate 4.40%      
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | L3Harris        
Debt Instrument [Line Items]        
Debt interest rate   4.40%    
Interest rate margin   0.25%    
Debt exchange, converted interest rate   4.40% 4.40%  
L3        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     $ 3,350  
Long-term debt   $ 329    
L3 | L3Harris        
Debt Instrument [Line Items]        
Long-term debt   329    
L3 | 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”)        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     650  
Long-term debt   149    
Debt interest rate       4.95%
L3 | 3.85% notes, due June 15, 2023        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     800  
Long-term debt   59    
L3 | 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”)        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     350  
Long-term debt   24    
L3 | 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”)        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     550  
Long-term debt   15    
L3 | 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”)        
Debt Instrument [Line Items]        
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     $ 1,000  
Long-term debt   $ 82