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Risk management - Derivative financial instruments to transition to alternative benchmarks (Details)
Dec. 31, 2023
Dec. 31, 2022
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal value 77,388,000,000 631,636,000,000
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | USD LIBOR    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal value 151,000,000 495,318,000,000
Derivatives by benchmark rate | Derivative financial instruments to transition to alternative benchmarks | WIBOR    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal value 77,238,000,000 136,318,000,000
Swaption | USD LIBOR ICE Swap Rate    
Disclosure Of Financial Instrument Exposure [Line Items]    
Nominal value   10,810,000,000