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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. 30, 2018
Dec. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unamortized debt issuance costs $ 18 $ 19
2.125% Convertible Senior Notes due 2026    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Stated interest rate 2.125%  
Unamortized debt discount $ 274 286
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 223 70
Long-term debt, net 1,170 1,324
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt 227 70
Long-term debt, net $ 2,312 $ 2,103