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Segments - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024
Disclosure of operating segments [line items] |  |  |  |
Dividend income | € 56 |  |  | € 117
Investment in Bank of Beijing |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Dividend income | 39 |  |  | € 101
Net Results IFRS-EU | Segments banking activities |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 11,339 | € 11,300 |  |
Operating expenses | 6,234 | 5,880 |  |
Net Results IFRS-EU | Segments banking activities | Corporate Line |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | 265 | 99 |  |
Increase (decrease) in income from foreign currency ratio hedging |  |  | € 83 |
Impairments |  | 53 |  |
Operating expenses | 239 | € 199 |  |
Net Results IFRS-EU | Segments banking activities | Corporate Line | Investment in Bank of Beijing |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Dividend income | € 39 |  |  |

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