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Cash and cash equivalents and investment securities (Tables)
 6 Months Ended
Jun. 30, 2020
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Schedule of Cash and Cash Equivalents
Million US dollar
  
30 June
2020
   
31 December
2019
 
Short-term bank deposits
   2 977    2 236 
Treasury Bills
   17 155    —   
Cash and bank accounts
   4 886    5 002
  
 
 
   
 
 
 
Cash and cash equivalents
  
 
25 018
 
  
 
7 238
 
  
 
 
   
 
 
 
Bank overdrafts
  
 
(153
) 
  
 
(68
) 
  
 
 
   
 
 
 
  
 
24 865
 
  
 
7 169
 
  
 
 
   
 
 
 
Summary of Investments in Short-Term Debt Securities
Million US dollar
  
30 June 2020
   
31 December 2019
 
Investment in unquoted companies
   92    85 
Investment in debt securities
   21    25 
  
 
 
   
 
 
 
Non-current
investments
  
 
113
 
  
 
110
 
  
 
 
   
 
 
 
Investment in debt securities
   102    92 
  
 
 
   
 
 
 
Current investments
  
 
102
 
  
 
92