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Capital and other commitments (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Capital and Other Commitments
         
          2021
$m
         
          2020
$m
Contracts placed for expenditure not provided for in the Group Financial Statements
       
 
 
 
       
 
Property, plant and equipment
       
 
13
 
       
17
Intangible assets
       
 
4
 
       
2
 
       
 
17
 
       
19