Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Narrative) (Details)

v3.19.2
Financial Instruments (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 29, 2019
Dec. 29, 2018
Foreign Currency Forward Contracts    
Schedule of Investments [Line Items]    
Contract maturity period 12 months  
Maximum length of time hedged in foreign currency cash flow hedges 12 months  
Cash Flow Hedging | Foreign Currency Forward Contracts    
Schedule of Investments [Line Items]    
Derivative, notional amount $ 506 $ 396
2.125% Convertible Senior Notes due 2026    
Schedule of Investments [Line Items]    
Stated interest rate 2.125%  
Conversion price (in dollars per share) $ 8.00  
Level 1 | Government money market funds    
Schedule of Investments [Line Items]    
Investment in money market fund and bank guarantee $ 5 5
Level 1 | Mutual funds    
Schedule of Investments [Line Items]    
Restricted investments $ 25 $ 21