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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
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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 |  |

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