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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	3 Months Ended		12 Months Ended
	Mar. 27, 2015	Mar. 28, 2014	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 2us-gaap_SeveranceCosts1	$ 8us-gaap_SeveranceCosts1	$ 30us-gaap_SeveranceCosts1
Electronic Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs		4
Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	1
Communication Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	1	3
NSS [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other 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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