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Risk management - Management adjustments (Details) - EUR (€)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Risk management [abstract]    
Economic sector based adjustments € 16 € 36
Inflation and Interest rate increases adjustments 233 351
Mortgage portfolio adjustments 128 126
Other post model adjustments 38 64
Total management adjustments € 415 € 577