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Derivative Instruments And Hedging Activities - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jul. 01, 2018
Dec. 31, 2017
Jul. 02, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Notional forward foreign exchange contracts outstanding $ 6,000 $ 4,300    
Average maturity of foreign currency forward contracts, in years 2 years      
Cash and equivalents $ 1,862 2,983 $ 1,856 $ 2,334
Marketable securities held in trust $ 187 $ 191    
Maximum        
Derivative Instruments, Gain (Loss) [Line Items]        
Maturity of fixed-income securities, in years 5 years