Summary of Major Components of Merger, Restructuring and Other Operating Expenses, Net (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015	Mar. 29, 2014
Merger related expenses
Merger related expenses, Severance, retention, and relocation	$ 5	$ 71
Merger related expenses, Transaction and integration	24	21
Merger related expenses, Other related expenses	(14)	4
Total Merger related expenses	15	96
International restructuring and certain other expenses	13	5
Staples Acquisition expenses	15
Total Merger, restructuring and other operating expenses, net	$ 43	$ 101