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Financial risk review - Schedule of Bank's Loans and Securities Short-Term Portfolio (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [abstract]    
Loan portfolio at amortized cost and investment portfolio less than/equal to 1 year according to its original terms $ 5,127 $ 4,087
Average term (days) 187 days 197 days
Loan portfolio at amortized cost and investment portfolio greater than/equal to 1 year according to its original terms $ 4,438 $ 4,119
Average term (days) 1388 days 1381 days