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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
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– 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 |  |

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