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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
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Disclosure of fair value measurement of assets [line items] |  |
Positive fair value movements from using reasonable possible alternatives | € 50 | € 69
Negative fair value movements from using reasonable possible alternatives | (27) | (80)
Total debt securities 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 | 20 | 18
Negative fair value movements from using reasonable possible alternatives | (14) | (9)
Total debt securities 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 | 6 | 3
Negative fair value movements from using reasonable possible alternatives | (1) | 0
Total debt securities 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 | 23 | 45
Negative fair value movements from using reasonable possible alternatives | (8) | (54)
Total debt securities 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 | 2 | 3
Negative fair value movements from using reasonable possible alternatives | € (3) | € (17)

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