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DEBT - Debt Issued Prior to Fiscal 2018 Still Outstanding (Details) - USD ($)
Apr. 27, 2015
Dec. 03, 2010
Dec. 31, 2021
Jan. 01, 2021
Feb. 01, 2008
Dec. 05, 2007
Feb. 28, 1998
Jan. 31, 1996
Debt Instrument [Line Items]                
Debt issued     $ 0          
Fixed-rate debt | Exelis Notes                
Debt Instrument [Line Items]                
Debt issued $ 2,400,000,000              
Debt instrument redemption price percentage 100.00%              
Debt instrument redemption price percentage of principal amount 101.00%              
Fixed-rate debt | 2025 Notes                
Debt Instrument [Line Items]                
Debt issued $ 600,000,000              
Debt interest rate 3.832%   3.832%          
Debt principal amount     $ 600,000,000 $ 600,000,000        
Fixed-rate debt | 2025 Notes | Treasury Rate                
Debt Instrument [Line Items]                
Interest rate margin 0.30%              
Fixed-rate debt | 2035 Notes                
Debt Instrument [Line Items]                
Debt issued $ 400,000,000              
Debt interest rate 4.854%   4.854%          
Debt principal amount     $ 400,000,000 400,000,000        
Fixed-rate debt | 2035 Notes | Treasury Rate                
Debt Instrument [Line Items]                
Interest rate margin 0.35%              
Fixed-rate debt | 2045 Notes                
Debt Instrument [Line Items]                
Debt issued $ 500,000,000              
Debt interest rate 5.054%   5.054%          
Debt principal amount     $ 500,000,000 500,000,000        
Fixed-rate debt | 2045 Notes | Treasury Rate                
Debt Instrument [Line Items]                
Interest rate margin 0.40%              
Fixed-rate debt | 2040 Notes                
Debt Instrument [Line Items]                
Debt issued   $ 300,000,000            
Debt interest rate   6.15% 6.15%          
Debt instrument redemption price percentage   100.00%            
Interest rate margin   0.35%            
Debt instrument redemption price percentage of principal amount   101.00%            
Debt principal amount     $ 300,000,000 300,000,000        
Fixed-rate debt | 7.00% debentures, due January 15, 2026                
Debt Instrument [Line Items]                
Debt issued               $ 100,000,000
Debt interest rate     7.00%         7.00%
Debt principal amount     $ 100,000,000 100,000,000        
Fixed-rate debt | 6.35% debentures, due February 1, 2028                
Debt Instrument [Line Items]                
Debt interest rate     6.35%          
Notes payable             $ 150,000,000  
Repurchased and retire principal amount of debentures           $ 25,000,000    
Redemption of debentures         $ 99,000,000      
Debt principal amount     $ 26,000,000 $ 26,000,000