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Note 7 Encumbered and unencumbered asstes (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Book value [Member] | Total assets encumbered and unencumbered [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets € 114,336 € 121,999 € 101,792
Unencumbered assets 548,548 614,260 596,898
Book value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 307 2,134 3,526
Unencumbered assets 22,280 14,556 12,113
Book value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 31,557 29,379 29,630
Unencumbered assets 89,307 100,108 95,611
Book value [Member] | Loans and advances and other [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 82,472 90,486 68,636
Unencumbered assets 436,962 499,595 489,174
Market value [Member] | equity instruments [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 307 2,134 3,526
Unencumbered assets 22,280 14,556 12,113
Market value [Member] | Debt securities [Member]      
Encumbered and unencumbered assets [Line Items]      
Encumbered assets 29,527 26,112 29,567
Unencumbered assets € 89,307 € 100,108 € 95,611