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Acquisitions and Divestitures, Goodwill and Intangible Assets - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 03, 2018
USD ($)
$ / shares
Sep. 29, 2019
USD ($)
Dec. 31, 2018
business
Sep. 30, 2018
USD ($)
Apr. 01, 2018
business
Sep. 29, 2019
USD ($)
business
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
business
Business Acquisition [Line Items]                
Amortization expense of intangibles | $   $ 69   $ 86   $ 209 $ 190  
CSRA                
Business Acquisition [Line Items]                
Payments to acquire businesses, gross | $ $ 9,700              
Series of Individually Immaterial Business Acquisitions                
Business Acquisition [Line Items]                
Payments to acquire businesses, gross | $           $ 19   $ 400
Number of businesses acquired           3   5
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    
Series of Individually Immaterial Business Acquisitions | Information Technology                
Business Acquisition [Line Items]                
Number of businesses sold     1   1 1    
Common Stock | CSRA                
Business Acquisition [Line Items]                
Percentage of interest acquired 100.00%              
Cash acquisition price (in dollars per share) | $ / shares $ 41.25