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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Income Tax Contingency [Line Items]      
Total gross amount of reserves for income taxes $ 1,547    
Interest accrued 144 $ 141  
Interest accrued recognized 14 $ 31  
Operating loss carryforwards 10,900    
Income tax undistributed international earnings 40,200    
Expire in 2016      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 200    
Expire Between 2017 and 2035 Years      
Income Tax Contingency [Line Items]      
Operating loss carryforwards 9,800    
Carried Forward Indefinitely      
Income Tax Contingency [Line Items]      
Operating loss carryforwards $ 900    
Tax Settlement, Years 2003-2009      
Income Tax Contingency [Line Items]      
Income Taxes Paid     $ 758
Provision for income taxes     209
Open Tax Years      
Income Tax Contingency [Line Items]      
Income Taxes Paid     $ 226