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Contingencies (Details)
$ in Millions
12 Months Ended
Dec. 26, 2015
USD ($)
Guarantor Obligations [Line Items]  
Guarantor Exposure as percent of outstanding loans 20.00%
Property Lease Guarantee [Member]  
Guarantor Obligations [Line Items]  
Year longest lease expires 2065
Potential amount of undiscounted payments we could be required to make in the event of non-payment $ 575
Present value of potential payments we could be required to make in the event of non-payment $ 475