Merger, Restructuring and Other Accruals - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Business Acquisition [Line Items]
Merger, restructuring and other operating expenses, net	$ 103	$ 27	$ 204	$ 46
Charges Incurred			140
Transaction and integration expenses	38	9	59	21
Merger-related expenses	48	7	119	9
Other costs related to Merger activities			38
Merger, Restructuring and Other Operating Expenses, Net
Business Acquisition [Line Items]
Charges Incurred			140
Non-cash Equity Compensation Expenses
Business Acquisition [Line Items]
Merger-related expenses			$ 5