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Risk management - Financial assets modified (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Financial assets modified [abstract]    
Amortised cost before modification € 1,888 € 1,565
Net modification results (107) (75)
Gross carrying amount at 31 December of financial assets for which loss allowance has changed to 12-month measurement during the period € 1,506 € 2,599