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Acquisitions and Divestitures, Goodwill, and Intangible Assets (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Apr. 03, 2018
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
business
Dec. 31, 2019
USD ($)
business
Dec. 31, 2018
USD ($)
business
Business Acquisition [Line Items]        
Amortization of intangible and finance lease right-of-use assets | $   $ 261 $ 277 $ 270
Aerospace        
Business Acquisition [Line Items]        
Number of businesses sold   1    
Technologies        
Business Acquisition [Line Items]        
Number of businesses sold   2 1 3
CSRA        
Business Acquisition [Line Items]        
Total purchase price | $ $ 9,700      
Series of Individually Immaterial Business Acquisitions        
Business Acquisition [Line Items]        
Total purchase price | $   $ 205 $ 20 $ 400
Series of Individually Immaterial Business Acquisitions | Aerospace        
Business Acquisition [Line Items]        
Number of businesses acquired   3 2 3
Series of Individually Immaterial Business Acquisitions | Combat Systems        
Business Acquisition [Line Items]        
Number of businesses acquired   2   1
Series of Individually Immaterial Business Acquisitions | Information Technology        
Business Acquisition [Line Items]        
Number of businesses acquired     1  
Series of Individually Immaterial Business Acquisitions | Technologies        
Business Acquisition [Line Items]        
Number of businesses acquired       1
Common Stock | CSRA        
Business Acquisition [Line Items]        
Percentage of interest acquired 100.00%      
Cash acquisition price (in dollars per share) | $ / shares $ 41.25