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Debt (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Feb. 03, 2012
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
Embedded derivative related to the CODES [Member]
Jul. 31, 2011
L-3 Holdings (Parent) [Member]
Dec. 31, 2011
L-3 Holdings (Parent) [Member]
Dec. 31, 2010
L-3 Holdings (Parent) [Member]
Jul. 29, 2005
L-3 Holdings (Parent) [Member]
Dec. 31, 2011
L-3 Holdings (Parent) [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Holdings (Parent) [Member]
Embedded derivative related to the CODES [Member]
Feb. 02, 2011
L-3 Holdings (Parent) [Member]
Embedded derivative related to the CODES [Member]
Jan. 31, 2011
L-3 Holdings (Parent) [Member]
Embedded derivative related to the CODES [Member]
Dec. 31, 2010
L-3 Holdings (Parent) [Member]
Embedded derivative related to the CODES [Member]
Dec. 31, 2011
L-3 Communications [Member]
Feb. 03, 2012
L-3 Communications [Member]
Dec. 31, 2010
L-3 Communications [Member]
Feb. 03, 2012
L-3 Communications [Member]
Minimum [Member]
Feb. 03, 2012
L-3 Communications [Member]
Maximum [Member]
Dec. 31, 2011
L-3 Communications [Member]
5 7/8% Senior Subordinated Notes due 2015 [Member]
Mar. 09, 2011
L-3 Communications [Member]
5 7/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Communications [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 22, 2011
L-3 Communications [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Communications [Member]
6 1/8% Senior Subordinated Notes due 2014 [Member]
Jun. 21, 2010
L-3 Communications [Member]
6 1/8% Senior Subordinated Notes due 2014 [Member]
Dec. 31, 2011
L-3 Communications [Member]
6 1/8% Senior Subordinated Notes due 2013 [Member]
Jul. 15, 2010
L-3 Communications [Member]
6 1/8% Senior Subordinated Notes due 2013 [Member]
Dec. 31, 2011
L-3 Communications [Member]
7 5/8% Senior Subordinated Notes due 2012 [Member]
Nov. 02, 2009
L-3 Communications [Member]
7 5/8% Senior Subordinated Notes due 2012 [Member]
Dec. 31, 2011
L-3 Communications [Member]
3.95% Senior Notes due 2016 [Member]
Dec. 31, 2010
L-3 Communications [Member]
3.95% Senior Notes due 2016 [Member]
Dec. 31, 2011
L-3 Communications [Member]
4.75% Senior Notes due 2020 [Member]
Dec. 31, 2010
L-3 Communications [Member]
4.75% Senior Notes due 2020 [Member]
Dec. 31, 2011
L-3 Communications [Member]
4.95% Senior Notes due 2021 [Member]
Dec. 31, 2010
L-3 Communications [Member]
4.95% Senior Notes due 2021 [Member]
Dec. 31, 2011
L-3 Communications [Member]
Notes due 2015 [Member]
5 7/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2010
L-3 Communications [Member]
Notes due 2015 [Member]
5 7/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Communications [Member]
Notes due 2015 [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2010
L-3 Communications [Member]
Notes due 2015 [Member]
6 3/8% Senior Subordinated Notes due 2015 [Member]
Dec. 31, 2011
L-3 Communications [Member]
5.20% Senior Notes due 2019 [Member]
Dec. 31, 2010
L-3 Communications [Member]
5.20% Senior Notes due 2019 [Member]
Oct. 07, 2009
L-3 Communications [Member]
5.20% Senior Notes due 2019 [Member]
Debt (Textual)                                                                                      
Interest rate on senior notes           3.00%           3.00%   3.00% 3.00%                   6.125%   6.125%   7.63%   3.95% 3.95% 4.75% 4.75% 4.95% 4.95% 5.875% 5.875% 6.375% 6.375% 5.20% 5.20%  
Outstanding letters of credit $ 3,000,000   $ 17,000,000                         $ 0   $ 0                                                 $ 650,000,000
Base rate above the latest federal funds rate                                 0.50%                                                    
Base rate above a Eurodollar rate                                 1.00%                                                    
Applicable spread on base rate option                                     0.25% 1.00%                                              
Applicable spread on Eurodollar rate option                                     1.25% 2.00%                                              
Commitment fees calculated on the daily amounts of the available unused commitments                                     0.15% 0.325%                                              
Letter of credit fees for performance and commercial letters of credit                                     0.675% 1.20%                                              
Letter of credit fees for financial letters of credit                                     1.25% 2.00%                                              
Principal Amount Redeemed                                           650,000,000 500,000,000 500,000,000   400,000,000   400,000,000   750,000,000 500,000,000   800,000,000   650,000,000           1,000,000,000    
Effective interest rate                           6.33%                                 4.11%   4.79%   5.02%           5.25%    
Net cash proceeds after deducting the discounts, commissions and estimated expenses                                                             491,000,000   790,000,000   639,000,000           987,000,000    
Redemption price as percentage of principal amount         100.00%                     100.00%                                                      
Senior notes redemption price                     101.00%                   101.958%   102.125%   102.042%   101.021%   101.271%                            
Sale of 3% Convertible Contingent Debt Securities by L-3 Holdings                   700,000,000                                                                  
Interest expense recognized               23,000,000 43,000,000                                                                    
Conversion rate of CODES, shares               10.3644                                                                      
Current convertible common stock price                       $ 115.78                                                              
Cash redemption price in CODES               equal to 100% of the principal amount                                                                      
Repurchases by the holders of the CODES                         11,000,000                                                            
Repurchased codes that have been classified as current liability                 11,000,000                                                                    
Remaining CODES that have been classified as long-term debt               689,000,000 689,000,000                                                                    
Percentage of average trading price of one thousand dollars in principal amount of CODES for contingent interest payable               0.25%                                                                      
Number of trading days ending on the second trading day preceding the first day of the applicable six-month interest period             5 days                                                                        
Available borrowings under revolving credit facility 997,000,000   983,000,000                                                                                
Total aggregate borrowings under revolving credit facility   1,000,000,000                                                                                  
Length of credit facility 3 years                                                                                    
Uncommitted incremental revolving facilities and additional term loan facilities   500,000,000                                                                                  
Conversion price of L-3 Holdings' CODES $ 96.48   $ 98.94 $ 100.14                                                                              
Excess of current common stock price over common stock conversion price 120.00%                                                                                    
Number of trading days for conversion, minimum 20 days                                                                                    
Number of consecutive trading-day period ending on the last trading day of the previous fiscal quarter 30 days                                                                                    
Maximum number of calendar days for purchase of common stock 45 days                                                                                    
Number of trading days preceding the declaration date for distribution 10 days                                                                                    
Percentage exceeding per share value of the closing price 10.00%                                                                                    
Percentage of average closing price 98.00%                                                                                    
Settlement amount upon conversion of the CODES 1,000                                                                                    
Number of consecutive business-day period 5 days                                                                                    
Number of consecutive trading-day period 5 days                                                                                    
Number of trading days in the conversion period 20 days                                                                                    
Portion of conversion rate 0.05                                                                                    
Payment period of contingent interest 6 months                                                                                    
Maximum consolidated leverage ratio under revolving credit facility covenants less than or equal to 4.0 to 1.0                                                                                    
Minimum consolidated interest coverage ratio under revolving credit facility covenants greater than or equal to 3.0 to 1.0                                                                                    
Maximum consolidated senior leverage ratio under revolving credit facility covenants less than or equal to 3.5 to 1.0                                                                                    
Maximum redemption or maturity period after maturity date of existing notes 91 days or less                                                                                    
Minimum fixed charge coverage ratio under senior subordinated notes indentures covenants at least 2.0 to 1.0                                                                                    
Maximum aggregate amount of other dividends, redemptions and investments 2,000,000,000                                                                                    
Percentage of consolidated net income (or deficit) of L-3 Communications for the quarter 50.00%                                                                                    
Percentage of proceeds from issuance of capital stock 100.00%                                                                                    
Percentage of proceeds from issuance of indebtedness 100.00%                                                                                    
Ability to incur additional indebtedness under the fixed charge coverage ratio test at least one dollar                                                                                    
Minimum aggregate amount of indebtedness, swap contracts or guarantees to trigger cross default provisions 50,000,000                                                                                    
Maximum days to cure defaults triggering cross default provisions 10 days                                                                                    
Minimum aggregate principal amount of senior subordinated notes accelerated to trigger cross default provisions 10,000,000                                                                                    
Minimum aggregate amount of senior notes accelerated to trigger cross default provisions 100,000,000                                                                                    
Change in the fair value of the embedded derivative $ 0   $ 0 $ 0