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Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 15,942 11,225 10,922 [1]  
Stock Repurchased During Period, Value $ 1,200 $ 820 $ 750 [1]  
Share Repurchases Prior To Current Reporting Date But With Settlement Dates Subsequent To Current Reporting Date       300
Stock Repurchase Program, Authorized Amount 1,000      
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 933      
Value Of Share Repurchases Prior To Current Reporting Date But With Settlement Dates Subsequent To Current Reporting Date       $ 20
December 2015 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 932      
Stock Repurchased During Period, Value $ 67      
Expiration Date Of Share Repurchase Authorization Dec. 31, 2016      
November 2014 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 13,231 0 0  
Stock Repurchased During Period, Value $ 1,000 $ 0 $ 0  
November 2013 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 1,779 8,488 0  
Stock Repurchased During Period, Value $ 133 $ 617 $ 0  
November 2012 [Member]        
Repurchase Of Shares Of Common Stock [Line Items]        
Stock Repurchased During Period, Shares 0 2,737 10,922  
Stock Repurchased During Period, Value $ 0 $ 203 $ 750  
[1] 2013 amount excludes the effect of $20 million in share repurchases (0.3 million shares) with trade dates prior to the 2012 fiscal year end but with settlement dates subsequent to the 2012 fiscal year end.