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Derivatives and hedge accounting - Maturity derivatives designated in cash flow hedging (Details) - - Derivatives - Cash flow hedges - Net payer and receiver swap - EUR (€) € in Millions | Dec. 31, 2024 | Dec. 31, 2023
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– Interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | € (50,886) | € (49,300)
– Interest rate swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (1,805) | (214)
– Interest rate swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (768) | 184
– Interest rate swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (10,590) | (8,557)
– Interest rate swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (13,389) | (18,551)
– Interest rate swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (10,551) | (6,636)
– Interest rate swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (6,040) | (7,246)
– Interest rate swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (4,522) | (4,896)
– Interest rate swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (3,222) | (3,384)
– Cross currency swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (3,619) | (362)
– Cross currency swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  |
– Cross currency swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (241) | 249
– Cross currency swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (972) | 1,029
– Cross currency swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | 122 | (932)
– Cross currency swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (1,029) | 503
– Cross currency swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (262) | (683)
– Cross currency swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (238) | 167
– Cross currency swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (999) | (693)
– Cross currency interest rate swaps |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (2,887) | (2,736)
– Cross currency interest rate swaps | Less than 1 month |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  |
– Cross currency interest rate swaps | 1 to 3 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  |
– Cross currency interest rate swaps | 3 to 12 months |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (25) |
– Cross currency interest rate swaps | 1 to 2 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  | (24)
– Cross currency interest rate swaps | 2 to 3 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (1,283) | (1,232)
– Cross currency interest rate swaps | 3 to 4 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument | (1,578) | (1,479)
– Cross currency interest rate swaps | 4 to 5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  |
– Cross currency interest rate swaps | >5 years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of hedging instrument |  |

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