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Fair value of assets and liabilities - Sensitivity analysis of level 3 instruments (Details) - Level 3 - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | € 28 | € 69
Negative fair value movements from using reasonable possible alternatives | (47) | (80)
Financial assets at fair value through profit or loss | Equity (equity derivatives, structured notes) |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 21 | 18
Negative fair value movements from using reasonable possible alternatives | (20) | (9)
Financial assets at fair value through profit or loss | Interest rates (Rates derivatives, FX derivatives) |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 5 | 3
Negative fair value movements from using reasonable possible alternatives | 0 | 0
Financial assets at fair value through profit or loss | 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 | 2 | 45
Negative fair value movements from using reasonable possible alternatives | (27) | (54)
Financial assets at fair value through profit or loss | Loans and advances |  |
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | 0 | 3
Negative fair value movements from using reasonable possible alternatives | € 0 | € (17)

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