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Business Segment Information - Total Assets by Segment (Details) - USD ($)
$ in Millions
Apr. 02, 2021
Jan. 01, 2021
Segment Reporting Information [Line Items]    
Assets $ 36,590 $ 36,960
Identifiable intangibles assets acquired 7,265 7,908
Operating segments | Integrated Mission Systems    
Segment Reporting Information [Line Items]    
Assets 9,080 8,906
Operating segments | Space and Airborne Systems    
Segment Reporting Information [Line Items]    
Assets 6,996 6,943
Operating segments | Communication Systems    
Segment Reporting Information [Line Items]    
Assets 5,720 5,746
Operating segments | Aviation Systems    
Segment Reporting Information [Line Items]    
Assets 5,436 5,026
Corporate    
Segment Reporting Information [Line Items]    
Assets 9,358 10,339
Corporate | Exelis    
Segment Reporting Information [Line Items]    
Identifiable intangibles assets acquired $ 7,300 $ 7,900