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Debt - Components of Debt and Reconciliation to Carrying Amount of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 27, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Aggregate borrowings and requirements for restated revolving credit facility $ 1,382  
L-3 Communications Corporation's [Member]
   
Debt Instrument [Line Items]    
Borrowings under Amended and Restated Revolving Credit Facility      
3.95% Senior Notes due 2016 500 500
5.20% Senior Notes due 2019 1,000 1,000
4.75% Senior Notes due 2020 800 800
4.95% Senior Notes due 2021 650 650
Subtotal 2,950 2,950
L-3 Communications Holdings, Inc. [Member]
   
Debt Instrument [Line Items]    
3% Convertible Contingent Debt Securities due 2035 689 689
Principal amount of long-term debt 3,639 3,639
Unamortized discounts (9) (10)
Carrying amount of long-term debt $ 3,630 $ 3,629