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Financial Instruments (Details) (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 26, 2015
Schedule of Investments [Line Items]    
Debt issuance cost, net $ 25 $ 25
Unamortized discount (308) 0
2.125% Convertible Senior Notes Due 2026    
Schedule of Investments [Line Items]    
Unamortized discount $ (308)  
Interest rate, stated percentage 2.125%  
Carrying Amount    
Schedule of Investments [Line Items]    
Short-term debt (excluding capital leases), at estimated fair value $ 0 230
Long-term debt (excluding capital leases), at estimated fair value 1,434 2,000
Estimated Fair Value | Fair Value, Inputs, Level 2    
Schedule of Investments [Line Items]    
Short-term debt (excluding capital leases), at estimated fair value 0 230
Long-term debt (excluding capital leases), at estimated fair value $ 2,313 $ 1,372