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Investment in Securities (Tables)
12 Months Ended
Dec. 31, 2018
Summary of Fair Value, Amortized Cost and Gross Unrealized Holding Gains and Losses of Securities

At December 31, 2018 and 2017, the fair value, amortized cost and gross unrealized holding gains and losses of such securities were as follows:

 

     Fair value      Amortized
cost
     Gross
unrealized
holding
gains
     Gross
unrealized
holding
losses
 
     (U.S. $ in millions)  

December 31, 2018

   $ 266      $ —        $ —        $ —    

December 31, 2017

   $ 102      $ 103      $ 19      $ 20  
Summary of Investment in Securities

Investments in securities are presented in the balance sheet as follows:

 

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

Other current assets

   $ 2      $ 14  

Other non-current assets

     61        83  

Money market funds

     203        5  
  

 

 

    

 

 

 
   $ 266      $ 102