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Related Party Transactions (Consolidated Income Statements Components) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Related Party Amounts Consolidated Income Statements [Abstract]      
Equity in Income of Conrail $ 0 $ 0 $ 0
Corporate Joint Venture [Member] | Materials, Supplies and Other [Member]
     
Related Party Amounts Consolidated Income Statements [Abstract]      
Rents, Fees, and Services 115 139 111
Purchase Price Amortization and Other 4 4 4
Equity in Income of Conrail (35) (26) (24)
Total Related Party Rents Fees And Services $ 84 $ 117 $ 91