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Debt - Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt (Parenthetical) (Detail) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 28, 2013
Dec. 31, 2012
Jun. 28, 2013
CODES Due 2035 [Member]
Jun. 28, 2013
L-3 Communications Corporation's [Member]
3.95% Senior Notes due 2016 [Member]
Dec. 31, 2012
L-3 Communications Corporation's [Member]
3.95% Senior Notes due 2016 [Member]
Jun. 28, 2013
L-3 Communications Corporation's [Member]
5.20% Senior Notes due 2019 [Member]
Dec. 31, 2012
L-3 Communications Corporation's [Member]
5.20% Senior Notes due 2019 [Member]
Jun. 28, 2013
L-3 Communications Corporation's [Member]
4.75% Senior Notes due 2020 [Member]
Dec. 31, 2012
L-3 Communications Corporation's [Member]
4.75% Senior Notes due 2020 [Member]
Jun. 28, 2013
L-3 Communications Corporation's [Member]
4.95% Senior Notes due 2021 [Member]
Dec. 31, 2012
L-3 Communications Corporation's [Member]
4.95% Senior Notes due 2021 [Member]
Jun. 28, 2013
L-3 Communications Holdings, Inc. [Member]
Jun. 29, 2012
L-3 Communications Holdings, Inc. [Member]
Jun. 28, 2013
L-3 Communications Holdings, Inc. [Member]
Jun. 29, 2012
L-3 Communications Holdings, Inc. [Member]
Jul. 26, 2013
L-3 Communications Holdings, Inc. [Member]
Subsequent Event [Member]
Jun. 28, 2013
L-3 Communications Holdings, Inc. [Member]
CODES Due 2035 [Member]
Dec. 31, 2012
L-3 Communications Holdings, Inc. [Member]
CODES Due 2035 [Member]
Debt Instrument [Line Items]                                    
Interest rate on Senior Notes     3.00% 3.95% 3.95% 5.20% 5.20% 4.75% 4.75% 4.95% 4.95%           3.00% 3.00%
Borrowings under Amended and Restated Revolving Credit Facility $ 1,000,000,000                                  
Revolving Credit Facility expiry date Feb. 03, 2017                                  
Excess of current common stock price over common stock conversion price 120.00%                                  
Common stock, shares 7.6                                  
Current convertible common stock price                                 $ 108.29  
Conversion price of L-3 Holdings' CODES $ 90.24                               $ 90.24  
Closing stock price                               $ 92.15    
Interest expense recognized                       5,000,000 5,000,000 10,000,000 10,000,000      
Carrying amount of the equity component (conversion feature) $ 64,000,000 $ 64,000,000