Merger, Restructuring and Other Accruals - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Business Acquisition [Line Items]
Merger, restructuring, and other operating expenses, net	$ 101	$ 19
Merger and other expenses	96
Net restructuring expenses	5
Merger-related transaction and integration expense	21
Merger-related employee expenses	71
Merger-related other expenses	4
Employee termination costs	$ 71