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Debt - Redemption of Senior Subordinated Notes (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]      
Debt retirement charge $ (13) $ (35) $ (18)
L-3 Communications Corporation's [Member]
     
Debt Instrument [Line Items]      
Debt retirement charge (13) (35) (18)
Redemption Price % of Principal 101.00%    
L-3 Communications Corporation's [Member] | 6 3/8% Senior Subordinated Notes due October 15, 2015 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Oct. 15, 2012    
Principal Amount Redeemed 250    
Debt retirement charge 5    
Redemption Price % of Principal 101.063%    
L-3 Communications Corporation's [Member] | 6 3/8% Senior Subordinated Notes due October 15, 2015 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Jul. 26, 2012    
Principal Amount Redeemed 250    
Debt retirement charge 8    
Redemption Price % of Principal 102.125%    
L-3 Communications Corporation's [Member] | 6 3/8% Senior Subordinated Notes due October 15, 2015 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Dec. 22, 2011    
Principal Amount Redeemed 500    
Debt retirement charge 17    
Redemption Price % of Principal 102.125%    
L-3 Communications Corporation's [Member] | 5 7/8% Senior Subordinated Notes due January 15, 2015 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Mar. 09, 2011    
Principal Amount Redeemed 650    
Debt retirement charge 18    
Redemption Price % of Principal 101.958%    
L-3 Communications Corporation's [Member] | 6 1/8% Senior Subordinated Notes due January 15, 2014 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Jun. 21, 2010    
Principal Amount Redeemed 400    
Debt retirement charge 13    
Redemption Price % of Principal 102.042%    
L-3 Communications Corporation's [Member] | 6 1/8% Senior Subordinated Notes due July 15, 2013 [Member]
     
Debt Instrument [Line Items]      
Redemption Date Jul. 15, 2010    
Principal Amount Redeemed 400    
Debt retirement charge $ 5    
Redemption Price % of Principal 101.021%