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Risk management - Financial assets modified (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial assets modified [abstract]    
Amortised cost before modification € 1,565 € 1,304
Net modification results (75) (124)
Gross carrying amount at 31 December of financial assets for which loss allowance has changed to 12-month measurement during the period € 2,599 € 2,382