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Acquisitions (Schedule of preliminary fair values of the assets acquired and liabilities assumed) (Details) - USD ($)
$ in Millions
Jul. 03, 2020
Jan. 31, 2020
Jan. 03, 2020
Dec. 28, 2018
Business Acquisition [Line Items]        
Goodwill $ 6,266   $ 4,912 $ 4,860
Dynetics        
Business Acquisition [Line Items]        
Cash   $ 18    
Receivables   159    
Inventory   47    
Other current assets   22    
Operating lease right-of-use assets   25    
Property, plant and equipment   173    
Intangible assets   544    
Other assets   9    
Accounts payable and accrued liabilities   (48)    
Accrued payroll and employee benefits   (29)    
Operating lease liabilities   (20)    
Other long-term liabilities   (4)    
Total identifiable net assets acquired   896    
Goodwill   764    
Purchase price   1,660    
Dynetics | Backlog        
Business Acquisition [Line Items]        
Intangible assets   $ 33