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)

v3.20.2
Financial Instruments (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments not Recorded at Fair Value) (Details) - USD ($)
$ / shares in Units, $ in Millions
Sep. 26, 2020
Dec. 28, 2019
Sep. 28, 2019
Sep. 30, 2016
2.125% Convertible Senior Notes due 2026 | 2.125% Convertible Senior Notes due 2026        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate 2.125%   2.125%  
Convertible Debt | 2.125% Convertible Senior Notes due 2026        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Stated interest rate 2.125% 2.125%   2.125%
Share price (in usd per share) $ 78.055      
Conversion price (in usd per share) $ 8.00     $ 8.00
Carrying Amount        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt, net $ 373 $ 486    
Estimated Fair Value | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Long-term debt, net $ 1,190 $ 1,823