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Note 7 Changes in impaired financial assets and guarantees given (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Changes in impaired assets and guarantees given [Line Items]      
Impaired financial assets and guarantees given at the beginning € 15,362 € 14,521 € 15,467
Additions Of Impaired Assets 12,255 11,066 8,084
Decrease of impaired assets [1] (7,346) (5,795) (5,742)
Increase (decrease) in financial assets 4,909 5,272 2,342
Decrease through write-off, financial assets (4,559) (3,770) (2,771)
Increase (decrease) through foreign exchange and other movements, financial assets (820) (660) (517)
Impaired financial assets and guarantees given at the end € 14,891 € 15,362 € 14,521
[1] (1) Reflects the total amount of impaired loans derecognized from the consolidated balance sheet throughout the period as a result of monetary recoveries as well as mortgage foreclosures and real estate assets received in lieu of payment.