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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, 2023 | Dec. 31, 2022
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | € 69 | € 65
Negative fair value movements from using reasonable possible alternatives | (80) | (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 | 18 | 12
Negative fair value movements from using reasonable possible alternatives | (9) | (6)
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 | 3 | 22
Negative fair value movements from using reasonable possible alternatives | 0 | (14)
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 | 45 | 32
Negative fair value movements from using reasonable possible alternatives | (54) | (28)
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 | 3 |
Negative fair value movements from using reasonable possible alternatives | € (17) | € (32)

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