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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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 30us-gaap_SeveranceCosts1	$ 29us-gaap_SeveranceCosts1	$ 23us-gaap_SeveranceCosts1
Electronic Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	16	16	13
Aerospace Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	5	2	1
Communication Systems [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	8	11	8
NSS [Member]
Restructuring Cost and Reserve [Line Items]
Employee severance and other termination costs	$ 1		$ 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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