Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Narrative) (Details)

v3.10.0.1
Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 30, 2017
Schedule of Investments [Line Items]    
Carrying value of cost method investments $ 3 $ 3
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 $ 355 300
Level 1 | Government money market funds    
Schedule of Investments [Line Items]    
Investment in money market fund and bank guarantee 5 2
Level 1 | Bank guarantee    
Schedule of Investments [Line Items]    
Investment in money market fund and bank guarantee 3  
Level 1 | Mutual funds    
Schedule of Investments [Line Items]    
Restricted investments $ 20 $ 18