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)

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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
Jun. 27, 2020
Dec. 28, 2019
Sep. 30, 2016
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) $ 50.10    
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 $ 490 $ 486  
Estimated Fair Value | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, net $ 1,932 $ 1,823