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Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Jun. 25, 2016
Dec. 26, 2015
Carrying Amount    
Short-term debt $ 226 $ 230
Long-term debt 2,002 2,000
Estimated Fair Value    
Unamortized debt issuance costs 23 25
Level 2    
Estimated Fair Value    
Short-term debt 226 230
Long-term debt $ 1,839 $ 1,372