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Description of Business (Details)
$ in Millions
3 Months Ended
Jun. 29, 2018
USD ($)
Mar. 29, 2019
USD ($)
Segment
Oct. 14, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of reportable segments | Segment   3  
Gain from discontinued operation $ 234    
Gain from discontinued operation, after tax 177    
Payment of working capital adjustment related to disposition of business   $ 20  
Ownership percentage after merger (percent)     46.00%
Vertex Aerospace [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Sale of business, base sales price 540    
Crestview Aerospace and TCS [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on sale of businesses 42    
Gain on sale of businesses, after tax $ 19    
Harris Corporation [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ratio of Harris shares received for every L3 common share     1.30
Harris Corporation [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership percentage after merger (percent)     54.00%