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DEBT - Debt Exchange - Narrative (Details)
$ in Millions
May 05, 2020
Jul. 02, 2019
USD ($)
Jul. 01, 2019
USD ($)
Dec. 30, 2022
Jan. 01, 2021
Dec. 14, 2020
Debt Instrument [Line Items]            
Debt instrument, period of redemption prior to maturity       3 months 1 month  
L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   $ 3,350        
Debt exchange to cash conversion ratio   0.001        
4.950% Senior Notes due February 15, 2021 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Percentage of debt exchanged 9990.00%          
Debt exchange, converted interest rate 4.95%          
4.950% Senior Notes due February 15, 2021 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Interest rate margin   0.25%        
Debt exchange, converted interest rate   4.95% 4.95%      
3.850% Senior Notes due June 15, 2023 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Percentage of debt exchanged 9990.00%          
Debt exchange, converted interest rate 3.85%          
3.850% Senior Notes due June 15, 2023 | L3Harris | Senior Unsecured Debt            
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%      
3.950% Senior Notes due May 28 2024 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Percentage of debt exchanged 9990.00%          
Debt exchange, converted interest rate 3.95%          
3.950% Senior Notes due May 28 2024 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate   3.95%        
Interest rate margin   0.20%        
Debt exchange, converted interest rate   3.95% 3.95%      
3.850% Senior Notes due December 15, 2026 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Percentage of debt exchanged 9990.00%          
Debt exchange, converted interest rate 3.85%          
3.850% Senior Notes due December 15, 2026 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate   3.85%        
Interest rate margin   0.25%        
Debt exchange, converted interest rate   3.85% 3.85%      
4.400% Senior Notes due June 15, 2028 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Percentage of debt exchanged 9890.00%          
Debt exchange, converted interest rate 4.40%          
4.400% Senior Notes due June 15, 2028 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate   4.40%        
Interest rate margin   0.25%        
Debt exchange, converted interest rate   4.40% 4.40%      
L3 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     $ 3,350      
Long-term debt   $ 329        
L3 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt   329        
L3 | 4.950% Senior Notes due February 15, 2021 | Senior Unsecured Debt            
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 | 3.850% Senior Notes due June 15, 2023 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     800      
Long-term debt   59        
L3 | 3.950% Senior Notes due May 28 2024 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     350      
Long-term debt   24        
L3 | 3.850% Senior Notes due December 15, 2026 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     550      
Long-term debt   15        
L3 | 4.400% Senior Notes due June 15, 2028 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Aggregate Principal Amount of L3 Notes (prior to debt exchange)     $ 1,000      
Long-term debt   $ 82