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Debt (Details Textual) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 29, 2012
Aug. 01, 2012
Feb. 03, 2012
Dec. 31, 2011
Jul. 31, 2012
6 3/8% Senior Subordinated Notes due 2015 [Member]
Jul. 26, 2012
6 3/8% Senior Subordinated Notes due 2015 [Member]
Jul. 17, 2012
6 3/8% Senior Subordinated Notes due 2015 [Member]
Jun. 29, 2012
3% Convertible Contingent Debt Securities due 2035 [Member]
Jun. 29, 2012
L-3 Communications [Member]
Dec. 31, 2011
L-3 Communications [Member]
Jun. 29, 2012
L-3 Communications [Member]
3.95% Senior Notes due 2016 [Member]
Dec. 31, 2011
L-3 Communications [Member]
3.95% Senior Notes due 2016 [Member]
Jun. 29, 2012
L-3 Communications [Member]
5.20% Senior Notes due 2019 [Member]
Dec. 31, 2011
L-3 Communications [Member]
5.20% Senior Notes due 2019 [Member]
Jun. 29, 2012
L-3 Communications [Member]
4.75% Senior Notes due 2020 [Member]
Dec. 31, 2011
L-3 Communications [Member]
4.75% Senior Notes due 2020 [Member]
Jun. 29, 2012
L-3 Communications [Member]
4.95% Senior Notes due 2021 [Member]
Dec. 31, 2011
L-3 Communications [Member]
4.95% Senior Notes due 2021 [Member]
Jun. 29, 2012
L-3 Communications [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Communications [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Jun. 29, 2012
L-3 Holdings (Parent) [Member]
Jul. 01, 2011
L-3 Holdings (Parent) [Member]
Jun. 29, 2012
L-3 Holdings (Parent) [Member]
Jul. 01, 2011
L-3 Holdings (Parent) [Member]
Aug. 01, 2012
L-3 Holdings (Parent) [Member]
Jun. 29, 2012
L-3 Holdings (Parent) [Member]
3% Convertible Contingent Debt Securities due 2035 [Member]
Dec. 31, 2011
L-3 Holdings (Parent) [Member]
3% Convertible Contingent Debt Securities due 2035 [Member]
Jan. 31, 2011
L-3 Holdings (Parent) [Member]
3% Convertible Contingent Debt Securities due 2035 [Member]
Debt (Textual)                                                        
Interest rate on senior notes             6.375% 3.00%     3.95% 3.95% 5.20% 5.20% 4.75% 4.75% 4.95% 4.95% 6.375% 6.375%           3.00% 3.00%  
Current convertible common stock price                                                   $ 110.60    
Common stock, shares                                             7.0          
Closing stock price                                                 $ 69.87      
Effective interest rate                                                       6.33%
Interest expense recognized                                         $ 5,000,000 $ 5,000,000 $ 10,000,000 $ 12,000,000        
Redemption of 6 3/8% Senior Subordinated Notes due 2015         250,000,000                                              
Senior notes redemption price           102.125%                                            
Debt retirement charge         8,000,000                                              
Length of credit facility 3 years                                                      
Total aggregate borrowings under revolving credit facility     1,000,000,000                                                  
Available borrowings under revolving credit facility 996,000,000                                                      
Outstanding letters of credit 4,000,000                                                        
Excess of current common stock price over common stock conversion price 120.00%                                                      
Conversion price of L-3 Holdings' CODES $ 95.46 $ 92.17                                                    
Carrying amount of the equity component (conversion feature) $ 64,000,000     $ 64,000,000