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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. 29, 2019
Dec. 29, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Unamortized debt issuance costs $ 14 $ 16
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 $ 249 262
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt, net 0 136
Long-term debt, net 1,031 1,114
Estimated Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt, net 0 136
Long-term debt, net $ 3,656 $ 2,428