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Inventories (Tables)
 6 Months Ended
Jun. 30, 2020
Text block [abstract]  
Summary of Inventories
 
Inventories
Million US dollar
  
30 June
2020
   
31 December
2019
 
Prepayments
   75    105 
Raw materials and consumables
   2 356    2 478 
Work in progress
   418    405 
Finished goods
   1 306    1 257 
Goods purchased for resale
   185    182 
  
 
 
   
 
 
 
Inventories
  
 
4 339
 
  
 
4 427
 
  
 
 
   
 
 
 
Inventories other than work in progress
    
Inventories stated at net realizable value
   287    171