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Income Taxes (Income Taxes Uncertainties) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Income Tax Uncertainties [Abstract]      
Reduction (Increase) to income tax reserves due to interest and penalties of prior year tax positions $ 1 $ 8 $ (1)
Previously recorded liabilities for interest and penalties of prior period tax audits $ 2 $ 3 $ 11