Goodwill and Identifiable Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014 Employees	Dec. 31, 2013
Goodwill [Line Items]
Approximate number of employees	45,000
Accumulated goodwill impairment losses	$ 58	$ 58
Electronic Systems [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses	43	43
Communication Systems [Member]
Goodwill [Line Items]
Accumulated goodwill impairment losses	$ 15	$ 15