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Insurance service expenses and other expenditure - Analysis of expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Insurance service expenses and other expenditure      
Expenses attributed to insurance acquisition cash flows $ 4,987 $ 4,833 $ 3,232
Other directly attributable expenses 1,328 1,258 1,221
Other expenditure 1,003 990 1,019
Total expenses $ 7,318 $ 7,081 $ 5,472