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Stock-Based Compensation, Stock-Based Compensation Plans (Details) - USD ($)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 03, 2016
Feb. 23, 2016
Feb. 22, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares of L-3 Holdings common stock available to be awarded (in shares)         4,260 3,690
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]            
Stock based compensation $ 49 $ 49 $ 52      
Income taxes (18) (18) (20)      
Total after income taxes 31 31 32      
Less: Stock-based compensation recorded in discontinued operations, net of income taxes 1 [1] 1 1      
Stock-based compensation recorded in continuing operations, net of income taxes 30 30 31      
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]            
Stock based compensation 10 9 9      
Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]            
Stock based compensation 35 38 40      
Performance Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]            
Stock based compensation $ 4 $ 2 $ 3      
2008 Long Term Performance Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of additional shares authorized for issuance under the amendment (in shares)       6,800    
Number of shares authorized for issuance under the amendment (in shares)       26,000    
Maximum number of shares of L-3 Holdings common stock may be issued pursuant to "full value" awards under the amendment (in shares) 9,200          
[1] Amount relates to the net impact of share based payment award modification in connection with the sale of NSS, which is further discussed below.