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Cash and cash equivalents and investment securities (Tables)
 12 Months Ended
Dec. 31, 2021
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Summary Of Investments In Short term Debt Securities
Million US dollar
   
31 December 2021
     
31 December 2020
  
Investment in unquoted companies
      139        115  
Investment on debt securities
      22        22  
    
 
 
     
 
 
  
Non-current
investments
   
 
161
     
 
137
  
    
 
 
     
 
 
  
Investment on debt securities
      374        396  
    
 
 
     
 
 
  
Current investments
   
 
374
     
 
396