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Employee Severance and Termination Costs - Employee Severance and Other Termination Costs Incurred by Reportable Segment (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Dec. 31, 2012
Reportable Segment:      
Employee severance and other related termination costs $ 19 $ 19 $ 23
C3ISR [Member]
     
Reportable Segment:      
Employee severance and other related termination costs 5 4  
Electronic Systems [Member]
     
Reportable Segment:      
Employee severance and other related termination costs 13 14  
P&LS [Member]
     
Reportable Segment:      
Employee severance and other related termination costs    1  
NSS [Member]
     
Reportable Segment:      
Employee severance and other related termination costs $ 1