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Employee Benefit Plans (Medicare Prescription Drug and Other Plans) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Defined Benefit Plan Disclosure [Line Items]      
Amount of premium expenses incurred under the plan $ 41 $ 46 $ 48
Expense associated with savings plans $ 37 $ 29 $ 28