Merger and Integration Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 23, 2013	Mar. 24, 2012
Restructuring Reserve [Roll Forward]
Liability as of December 29, 2012	$ 24
2013 merger and integration charges	1	2
Cash payments	(11)	(20)
Liability as of March 23, 2013	14
Severance And Other Employee Costs
Restructuring Reserve [Roll Forward]
Liability as of December 29, 2012	18
2013 merger and integration charges	0
Cash payments	(9)
Liability as of March 23, 2013	9
Other Costs
Restructuring Reserve [Roll Forward]
Liability as of December 29, 2012	6
2013 merger and integration charges	1
Cash payments	(2)
Liability as of March 23, 2013	$ 5