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Fair value of assets and liabilities - Sensitivity analysis of level 3 instruments (Details) - Level 3 - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | € 37 | € 28
Negative fair value movements from using reasonable possible alternatives | (28) | (47)
Financial assets at fair value through profit or loss, category | Equity (equity derivatives, structured notes) |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 19 | 21
Negative fair value movements from using reasonable possible alternatives | (9) | (20)
Financial assets at fair value through profit or loss, category | Interest rates (Rates derivatives, FX derivatives) |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 1 | 5
Negative fair value movements from using reasonable possible alternatives | 0 | 0
Financial assets at fair value through profit or loss, category | Credit (Debt securities, Loans, structured notes, credit derivatives) |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 15 | 2
Negative fair value movements from using reasonable possible alternatives | (19) | (27)
Financial assets at FVOCI | Equity securities |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 2 | 0
Negative fair value movements from using reasonable possible alternatives | € 0 | € 0

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