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Fair Value Measurements - Schedule of Fair Value and Carrying Value of Long-Term Debt (Details) - Level 2 - USD ($)
$ in Millions
Jun. 26, 2015
Dec. 26, 2014
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt (Including Current Maturities) $ 10,788 $ 11,042
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term Debt (Including Current Maturities) $ 10,125 $ 9,742