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Risk management - Derivative financial instruments to transition to alternative benchmarks (Details)
number in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal amount of hedging instrument 110,189 77,388
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | USD LIBOR [Member]    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal amount of hedging instrument   151
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | WIBOR    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal amount of hedging instrument 110,189 77,238