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Employee Severance and Termination Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 27, 2015 Employees	Mar. 28, 2014	Dec. 31, 2014 Employees
Restructuring and Related Activities [Abstract]
Employee severance and other termination costs	$ 2us-gaap_SeveranceCosts1	$ 8us-gaap_SeveranceCosts1	$ 30us-gaap_SeveranceCosts1
Number of employees terminated	320lll_NumberOfEmployeeTerminated		2,000lll_NumberOfEmployeeTerminated
Remaining balance of employee termination costs	$ 8		$ 11

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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