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Note 7 Encumbered and unencumbered asstes (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Book value [Member] | Total assets encumbered and unencumbered [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets € 92,916 € 114,336 € 121,999
Unencumbered assets 620,257 548,548 614,260
Book value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 819 307 2,134
Unencumbered assets 11,293 22,280 14,556
Book value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 33,533 31,557 29,379
Unencumbered assets 93,238 89,307 100,108
Book value [Member] | Loans and advances and other [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 58,563 82,472 90,486
Unencumbered assets 515,726 436,962 499,595
Market value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 819 307 2,134
Unencumbered assets 11,293 22,280 14,556
Market value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 32,291 29,527 26,112
Unencumbered assets € 93,238 € 89,307 € 100,108