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Significant Accounting Policies (Details) (Narrative) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
Marketing, communications and advertising expenses $ 194us-gaap_MarketingAndAdvertisingExpense $ 210us-gaap_MarketingAndAdvertisingExpense $ 287us-gaap_MarketingAndAdvertisingExpense
Equipment | Maximum      
Property, plant and equipment, useful life 6 years    
Equipment | Minimum      
Property, plant and equipment, useful life 2 years    
Building and Building Improvements | Maximum      
Property, plant and equipment, useful life 40 years