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Insurance (Tables)
12 Months Ended
Dec. 31, 2023
Insurance [Abstract]  
Summary of Reconciliation of Changes In Insurance Contracts
            
   2023
$m
          
   2022
$m
 
At 1 January
     
 
32
 
    
 
25
 
Insurance expenses
     
 
21
 
    
 
9
 
Claims and other amounts paid
     
 
(15
    
 
(2
Impact of discounting and other changes
     
 
(1
    
 
 
At 31 December
     
 
37
 
    
 
32
 
Analysed as:
     
 
 
 
    
 
 
 
Current
     
 
12
 
    
 
9
 
Non-current
     
 
25
 
    
 
23
 
 
     
 
37
 
    
 
32
 
Incurred but not reported claims (‘IBNR’)
a
     
 
20
 
    
 
25
 
Reported but not settled claims
     
 
17
 
    
 
7
 
 
     
 
37
 
    
 
32
 
 
a
 
Includes unallocated loss expenses.
Summary of Analysis of Insurance Revenue
            
   2023
$m
          
   2022
$m
 
Revenue from insurance activities
     
 
21
 
    
 
15
 
Insurance expenses (inclusive of overhead costs)
     
 
(23
    
 
(11
Insurance result
     
 
(2
    
 
4