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DEBT - Debt Exchanged Narrative (Details)
$ in Millions
Jul. 02, 2019
USD ($)
day
Jul. 01, 2019
USD ($)
Jan. 03, 2020
USD ($)
Jun. 29, 2019
USD ($)
Jun. 28, 2019
USD ($)
Jun. 29, 2018
USD ($)
Debt Instrument [Line Items]            
Long-term debt     $ 6,951   $ 3,419 $ 3,712
Unamortized bond premium     $ 154   $ 0 $ 0
Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt       $ 3,520    
Unamortized bond premium       $ 171    
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          
Days in registered exchange offer period | day 365          
Debt special additional interest rate percentage per year 0.25%          
Days in registered exchange offer period following date of default | day 90          
4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate 4.95%          
Interest rate margin 0.25%          
3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) | 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%          
3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate 3.85%          
Interest rate margin 0.25%          
4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate 4.40%          
Interest rate margin 0.25%          
3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt interest rate 3.95%          
Interest rate margin 0.20%          
Minimum | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt special additional interest rate percentage per year 0.25%          
Maximum | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Debt special additional interest rate percentage per year 0.50%          
L3 | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt $ 329          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   $ 3,350        
L3 | L3Harris | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt 329          
L3 | 4.95% notes due February 15, 2021 (“4.95% 2021 Notes”) | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt 149          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   650        
L3 | 3.85% notes due June 15, 2023 (“3.85% 2023 Notes”) | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt 59          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   800        
L3 | 3.85% notes due December 15, 2026 (“3.85% 2026 Notes”) | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt 15          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   550        
L3 | 4.40% notes due June 15, 2028 (“4.40% 2028 Notes”) | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt 82          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   1,000        
L3 | 3.95% notes due May 28, 2024 (“3.95% 2024 Notes”) | Senior Unsecured Debt            
Debt Instrument [Line Items]            
Long-term debt $ 24          
Aggregate Principal Amount of L3 Notes (prior to debt exchange)   $ 350