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Acquisitions and Divestitures, Goodwill, and Intangible Assets (Narrative) (Details)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Apr. 03, 2018
USD ($)
$ / shares
Sep. 29, 2019
business
Dec. 31, 2019
USD ($)
business
Dec. 31, 2018
USD ($)
business
Dec. 31, 2017
USD ($)
business
Business Acquisition [Line Items]          
Amortization of intangible and finance lease right-of-use assets | $     $ 277 $ 270 $ 79
Information Technology          
Business Acquisition [Line Items]          
Number of businesses sold       3  
CSRA          
Business Acquisition [Line Items]          
Total purchase price | $ $ 9,700        
Series of Individually Immaterial Business Acquisitions          
Business Acquisition [Line Items]          
Total purchase price | $     $ 20 $ 400 $ 400
Number of businesses acquired       5 4
Series of Individually Immaterial Business Acquisitions | Aerospace          
Business Acquisition [Line Items]          
Number of businesses acquired     2 2  
Series of Individually Immaterial Business Acquisitions | Mission Systems          
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