Restructuring, Impairment And Integration Charges (Schedule Of Merger And Integration Activity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 24, 2012	Mar. 19, 2011
Restructuring Cost and Reserve [Line Items]
Liability as of December 31, 2011	$ 105
2012 merger and integration charges	2	55
Cash payments	(20)	(117)
Non-cash charges	3
Liability as of March 24, 2012	90
Severance And Other Employee Costs [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of December 31, 2011	98
2012 merger and integration charges	2
Cash payments	(19)
Non-cash charges	4
Liability as of March 24, 2012	85
Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Liability as of December 31, 2011	7
Cash payments	(1)
Non-cash charges	(1)
Liability as of March 24, 2012	$ 5