Financial assets at fair value through profit or loss - Summary of non-trading derivatives (Details) - EUR (€) € in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of fair value measurement of assets [line items] | ||
| Non-trading derivatives | € 1,657 | € 2,463 |
| Non-trading derivatives | Other non-trading derivatives | ||
| Disclosure of fair value measurement of assets [line items] | ||
| Non-trading derivatives | 550 | 1,606 |
| - fair value hedges | Non-trading derivatives | ||
| Disclosure of fair value measurement of assets [line items] | ||
| Non-trading derivatives | 578 | 617 |
| - cash flow hedges | Non-trading derivatives | ||
| Disclosure of fair value measurement of assets [line items] | ||
| Non-trading derivatives | 459 | 158 |
| - hedges of net investments in foreign operations | Non-trading derivatives | ||
| Disclosure of fair value measurement of assets [line items] | ||
| Non-trading derivatives | € 68 | € 82 |