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Insurance (Tables)
 12 Months Ended
Dec. 31, 2024
Insurances [Abstract]  
Summary of Reconciliation of Changes In Insurance Contracts
        
    2024
$m
             2023
$m		  
At 1 January    
37
      32  
Insurance expenses    
28
      21  
Claims and other amounts paid    
(23
) 
       (15 ) 
Impact of discounting and other changes    
(3
) 
       (1 ) 
At 31 December
    
39
      37  
                     
Analysed as:                    
Current
    
14
      12  
Non-current
    
25
      25  
     
39
      37  
                     
Incurred but not reported claims
a
   
18
      20  
Reported but not settled claims    
21
      17  
     
39
      37  
 
a.
Includes unallocated loss expenses.
Summary of Analysis of Insurance Revenue
        
    2024
$m
        
    2023
$m
  
Revenue from insurance activities
    
23
   
21
Insurance expenses (inclusive of overhead costs)
    
(29
) 
    
(23
) 
Insurance result
    
(6
) 
    
(2
)