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Derivatives and hedge accounting - Maturity derivatives designated in fair value hedging (Details) - -  fair value hedges - Net payer and receiver swap - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
– Interest rate swaps | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument € 50,358 € 46,471
– Interest rate swaps | Less than 1 month | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 43 (670)
– Interest rate swaps | 1 to 3 months | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,224 623
– Interest rate swaps | 3 to 12 months | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 7,341 4,648
– Interest rate swaps | 1 to 2 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 14,134 9,482
– Interest rate swaps | 2 to 3 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 6,313 13,201
– Interest rate swaps | 3 to 4 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 12,050 7,224
– Interest rate swaps | 4 to 5 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 7,688 10,164
– Interest rate swaps | >5 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument 1,564 1,798
– Other interest derivatives | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (2,540) (1,797)
– Other interest derivatives | Less than 1 month | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (4)
– Other interest derivatives | 1 to 3 months | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (47) (42)
– Other interest derivatives | 3 to 12 months | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (218) (183)
– Other interest derivatives | 1 to 2 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (317) (361)
– Other interest derivatives | 2 to 3 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (389) (263)
– Other interest derivatives | 3 to 4 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (347) (230)
– Other interest derivatives | 4 to 5 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (287) (277)
– Other interest derivatives | >5 years | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (932) € (442)
– Cross currency swaps | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (299)  
– Cross currency swaps | Less than 1 month | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (142)  
– Cross currency swaps | 1 to 3 months | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (60)  
– Cross currency swaps | 3 to 12 months | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument (98)  
– Cross currency swaps | 1 to 2 years | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument  
– Cross currency swaps | 2 to 3 years | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument  
– Cross currency swaps | 3 to 4 years | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument  
– Cross currency swaps | 4 to 5 years | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument  
– Cross currency swaps | >5 years | Foreign exchange    
Disclosure of detailed information about hedging instruments [line items]    
Nominal amount of hedging instrument