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Auditor's remuneration paid to Pricewaterhouse Coopers LLP (Tables)
 12 Months Ended
Dec. 31, 2024
Disclosure [Abstract]  
Summary of Auditor's remuneration paid to Pricewaterhouse Coopers LLP
        
    2024
$m
             2023
$m		               2022
$m		  
Audit of the Financial Statements    
7
      7         6  
Audit of subsidiaries    
3
      3         2  
Other assurance services
a
   
1
      1         1  
     
11
      11         9  
                               
Under SEC regulations analysed as:                              
Audit
    
10
      10         8  
Other audit-related
    
1
      1         1  
     
11
      11         9