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Risk management - Non-derivative financial instruments to transition to alternative benchmarks (Details) - Non-Derivative Financial Instruments To Transition To Alternative Benchmarks [Member] - EUR (€)
€ in Millions
Jun. 30, 2022
Dec. 31, 2021
Disclosure Of Financial Instrument Exposure [Line Items]    
Financial Assets, Carrying Value € 40,485 € 42,570
Financial Liabilities, Carrying Value 1,501 1,565
Off balance sheet commitments 9,979 16,969
GBP LIBOR [Member]    
Disclosure Of Financial Instrument Exposure [Line Items]    
Financial Assets, Carrying Value   764
Off balance sheet commitments   350
USD LIBOR [Member]    
Disclosure Of Financial Instrument Exposure [Line Items]    
Financial Assets, Carrying Value 40,485 41,805
Financial Liabilities, Carrying Value 1,501 1,542
Off balance sheet commitments € 9,979 16,435
CHF LIBOR [Member]    
Disclosure Of Financial Instrument Exposure [Line Items]    
Financial Assets, Carrying Value   1
EONIA [Member]    
Disclosure Of Financial Instrument Exposure [Line Items]    
Financial Liabilities, Carrying Value   23
Off balance sheet commitments   € 184