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Summary of Significant Accounting Policies (Details 4) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Deferred Tax Assets, Net of Valuation Allowance, Current $ 676 $ 653  
Other current liabilities 417 329  
Repurchase Of Shares Of Common Stock [Abstract]      
Stock Repurchased During Period, Value (1,200) (820) $ (750) [1]
Reduction to Retained earnings      
Repurchase Of Shares Of Common Stock [Abstract]      
Stock Repurchased During Period, Value $ (1,124) (725) $ (640)
Adjustments for New Accounting Pronouncement [Member]      
Deferred Tax Assets, Net of Valuation Allowance, Current   93  
Other current liabilities   9  
Deferred Tax Liabilities, Gross, Current   2  
Deferred Tax Assets, Net, Noncurrent   $ 82  
[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.