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Summary of Significant Accounting Policies (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Sep. 29, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Estimates [Abstract]        
Increase in operating income due to changes in contract estimates   $ 184 $ 149 $ 52
Percentage of increase in consolidated operating income due to changes in contract estimates   18.00% 16.00% 7.00%
Increase in operating income due to changes in contract estimates, diluted (in dollars per share)   $ 1.48 $ 1.23 $ 0.45
Revenue Recognition [Abstract]        
Percentage of net sales accounted for under contract accounting standards   59.00%    
Percentage of fixed-price type contracts   49.00%    
Percentage of cost-plus type contracts   10.00%    
Period of performance for contracts accounted for under the percentage-of-completion method of accounting, minimum   1 year    
Accrued product warranty costs [Roll Forward]:        
Balance at January 1 [1]   $ 109 $ 105  
Acquisitions during this period [1]   3 3  
Accruals for product warranties issued during the period [1]   52 51  
Foreign currency translation adjustments [1]   1 (1)  
Settlements made during the period [1]   (66) (49)  
Balance at December 31 [1]   99 109 $ 105
Goodwill and Indefinite-lived Intangible Assets [Abstract]        
Goodwill impairment charges [2]   0 $ 0 46
NSS [Member]        
Goodwill and Indefinite-lived Intangible Assets [Abstract]        
Goodwill impairment charges       955
NSS [Member] | Discontinued Operations [Member]        
Goodwill and Indefinite-lived Intangible Assets [Abstract]        
Goodwill impairment charges       909
NSS [Member] | Continuing Operations [Member]        
Goodwill and Indefinite-lived Intangible Assets [Abstract]        
Goodwill impairment charges       $ 46
Vertex Aerospace [Member]        
Goodwill and Indefinite-lived Intangible Assets [Abstract]        
Goodwill impairment charges $ 187 187    
Goodwill impairment after income taxes   $ 133    
Minimum [Member] | Buildings and Improvements [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life   10 years    
Minimum [Member] | Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life   3 years    
Maximum [Member] | Buildings and Improvements [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life   40 years    
Maximum [Member] | Machinery, Equipment, Furniture and Fixtures [Member]        
Property, Plant and Equipment [Abstract]        
Estimated useful life   10 years    
[1] Warranty obligations incurred in connection with long-term production contracts that are accounted for under the POC cost-to-cost method are included within the contract estimates at completion and are excluded from the above amounts. The balances above include both the current and non-current amounts.
[2] Represents non-cash goodwill impairment charges recorded during 2015 of $46 million related to a business retained by L3 in connection with the sale of the NSS segment.