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Investment securities
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Investment securities
17.

Investment securities

 

Million US dollar

    2018      2017  

Investment in unquoted companies

      84        76  

Investment on debt securities

      24        24  
  

 

 

     

 

 

  

Non-current investments

      108        100  

Investment on debt securities

      87        1 304  
  

 

 

     

 

 

  

Current investments

      87        1 304  

As of 31 December 2018, current debt securities of 87m US dollar mainly represented investments in government bonds. The company’s investments in such short-term debt securities are primarily to facilitate liquidity and for capital preservation.