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Insurance service expenses and other expenditure - Staff and employment costs (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
employee
Dec. 31, 2023
USD ($)
employee
Dec. 31, 2022
USD ($)
employee
Costs of employment      
Wages and salaries $ 1,119 $ 1,079 $ 1,018
Social security costs 37 37 41
Defined contribution schemes 54 46 40
Total costs of employment $ 1,210 $ 1,162 $ 1,099
Average number of staff employed by the Group during the year 15,412 15,030 14,196
Asia and Africa      
Costs of employment      
Average number of staff employed by the Group during the year 14,851 14,479 13,685
Number of commission based sales staff | employee 702 621 744
Head office function      
Costs of employment      
Average number of staff employed by the Group during the year 561 551 511