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Derivatives and hedge accounting - Maturity derivatives designated in net investment hedging (Details) - -  hedges of net investments in foreign operations - - Derivatives - – FX forwards and Cross currency swaps - Net payer and receiver swap - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument € (12,916) € (10,672)
Less than 1 month    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument (8,681) (6,009)
1 to 3 months    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument (4,158) (4,576)
3 to 12 months    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument (76) (87)
1 to 2 years    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument
2 to 3 years    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument
3 to 4 years    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument
4 to 5 years    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument
>5 years    
Disclosure of detailed information about hedges [line items]    
Nominal amount of hedging instrument