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Inventories (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Inventories
Million US dollar
   
31 December 2021
     
31 December 2020
  
Prepayments
      115        92  
Raw materials and consumables
      3 072        2 499  
Work in progress
      451        439  
Finished goods
      1 537        1 256  
Goods purchased for resale
      224        197  
    
 
 
     
 
 
  
Inventories
   
 
5 399
     
 
4 482
  
    
 
 
     
 
 
  
Inventories other than work in progress
                  
Inventories stated at net realizable value
      368        214