Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 25, 2010		Dec. 26, 2009
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value	$ 733	[1]	$ 390	[1]	$ 0
Repurchase of shares of Common Stock (in shares)	(14,305)	[1]	(9,759)	[1]	0
Reduction to Retained earnings
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value	$ 483		$ 0		$ 0

[1] 2011 amount excludes and 2010 amount includes the effect of $19 million in share repurchases (0.4 million shares) with trade dates prior to the 2010 fiscal year end but cash settlement dates subsequent to the 2010 fiscal year.