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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	6 Months Ended		12 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Dec. 31, 2012
Reportable Segment:
Employee severance and other related termination costs	$ 14	$ 12	$ 23
C3ISR [Member]
Reportable Segment:
Employee severance and other related termination costs	3	3
Electronic Systems [Member]
Reportable Segment:
Employee severance and other related termination costs	10	7
P&LS [Member]
Reportable Segment:
Employee severance and other related termination costs		2
NSS [Member]
Reportable Segment:
Employee severance and other related termination costs	$ 1

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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