Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details)

v3.10.0.1
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