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Debt (Details) (USD $)
In Millions
Jul. 01, 2011
Dec. 31, 2010
Components of debt and reconciliation to carrying amount    
Borrowings under Revolving Credit Facility $ 11  
Less: Current portion of long-term debt 0 [1] (11)
Carrying amount of long-term debt, excluding current portion 4,126 [1] 4,126
5 7/8% Senior Subordinated Notes [Member]
   
Components of debt and reconciliation to carrying amount    
Senior Subordinated Notes due 2015 0 650
6 3/8% Senior Subordinated Notes [Member]
   
Components of debt and reconciliation to carrying amount    
Senior Subordinated Notes due 2015 1,000 1,000
L-3 Holdings (Parent) [Member]
   
Components of debt and reconciliation to carrying amount    
3% Convertible Contingent Debt Securities due 2035 689 700
Principal amount of long-term debt 4,139 4,150
Less: Unamortized discounts (13) (13)
Carrying amount of long-term debt 4,126 4,137
Less: Current portion of long-term debt   (11)
Carrying amount of long-term debt, excluding current portion 689 687
L-3 Communications [Member]
   
Components of debt and reconciliation to carrying amount    
Borrowings under Revolving Credit Facility 0 0
5.20% Senior Notes due 2019 1,000 1,000
4.75% Senior Notes due 2020 800 800
4.95% Senior Notes due 2021 650 0
Subtotal 3,450 3,450
Less: Current portion of long-term debt   (11)
Carrying amount of long-term debt, excluding current portion $ 4,126 $ 4,126
[1] Unaudited