Summary of Significant Accounting Policies (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2012		Dec. 31, 2011		Dec. 25, 2010
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value	$ 985	[1]	$ 733	[2]	$ 390	[2]
Reduction to Retained earnings
Repurchase Of Shares Of Common Stock [Abstract]
Stock Repurchased During Period, Value	$ 794		$ 483		$ 0

[1] 2012 amount includes the effect of $20 million in share repurchases (0.3 million shares) with trade dates prior to December 29, 2012 but with settlement dates subsequent to December 29, 2012.

[2] 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.