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DEBT - Debt Issued Prior to 2020 Still Outstanding (Details) - USD ($)
$ in Millions
Apr. 27, 2015
Dec. 03, 2010
Jan. 03, 2020
Feb. 01, 2008
Dec. 05, 2007
Feb. 28, 1998
Jan. 31, 1996
Debt Instrument [Line Items]              
Notes payable $ 2,400            
Exelis Notes              
Debt Instrument [Line Items]              
Debt instrument redemption price percentage 100.00%            
3.832% notes, due April 27, 2025              
Debt Instrument [Line Items]              
Notes payable     $ 600        
Debt interest rate     3.832%        
4.854% notes, due April 27, 2035              
Debt Instrument [Line Items]              
Notes payable     $ 400        
Debt interest rate     4.854%        
5.054% notes, due April 27, 2045              
Debt Instrument [Line Items]              
Notes payable     $ 500        
Debt interest rate     5.054%        
6.15% notes, due December 15, 2040              
Debt Instrument [Line Items]              
Notes payable   $ 300          
Debt interest rate   6.15%          
Debt instrument redemption price percentage   100.00%          
Debt instrument redemption price percentage of principal amount   101.00%          
Interest rate margin   0.35%          
7.0% debentures, due January 15, 2026              
Debt Instrument [Line Items]              
Notes payable             $ 100
Debt interest rate             7.00%
6.35% debentures, due February 1, 2028              
Debt Instrument [Line Items]              
Notes payable           $ 150  
Debt interest rate           6.35%  
Repurchased and retire principal amount of debentures         $ 25    
Redemption of debentures     $ 26 $ 99      
External Credit Rating, Investment Grade | Exelis Notes              
Debt Instrument [Line Items]              
Debt instrument redemption price percentage of principal amount 101.00%            
Treasury Rate | 3.832% notes, due April 27, 2025              
Debt Instrument [Line Items]              
Interest rate margin 0.30%            
Treasury Rate | 4.854% notes, due April 27, 2035              
Debt Instrument [Line Items]              
Interest rate margin 0.35%            
Treasury Rate | 5.054% notes, due April 27, 2045              
Debt Instrument [Line Items]              
Interest rate margin 0.40%