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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
Sep. 24, 2016
Dec. 26, 2015
Carrying Amount    
Short-term debt $ 0 $ 230
Long-term debt 1,630 2,000
Estimated Fair Value    
Unamortized debt issuance costs 26 25
Level 2    
Estimated Fair Value    
Short-term debt 0 230
Long-term debt 1,990 $ 1,372
2.125% Convertible Senior Notes due 2026 | Convertible Debt    
Estimated Fair Value    
Unamortized debt discount $ 273