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Inventories (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Inventories
 
    
2021
$m
      2020
$m		  
Raw materials
   
 
1,737
 
      1,403  
Work-in-progress
(i)
   
 
136
 
      144  
Finished goods
   
 
1,738
 
      1,570  
Total inventories at the lower of cost and net realisable value
   
 
3,611
 
      3,117  
 
(i)
Work-in-progress
includes $9 million (2020: $9 million) in respect of the cumulative costs incurred, net of amounts transferred to cost of sales under
percentage-of-completion
accounting, for construction contracts in progress at the balance sheet date.