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Long-term Employee-related Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Schedule of Long Term Employee Related Obligation
a.
Long-term employee-related obligations consisted of the following:
  
December 31,
 
  
    2019    
 
  
    2018    
 
  
(U.S. $ in millions)
 
Accrued severance obligations
  $
76
    $
75
 
Defined benefit plans
   
165
     
146
 
                 
Total
  $
241
    $
221