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Long-term Employee-related Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Schedule of Long Term Employee Related Obligation
a.

Long-term employee-related obligations consisted of the following

 

     December 31,  
       2018          2017    
     (U.S. $ in millions)  

Accrued severance obligations

    $ 75      $ 91  

Defined benefit plans

      146        182  
  

 

 

     

 

 

  

Total

    $ 221      $ 273