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Note 7 Encumbered and unencumbered asstes (Details) - EUR (€) € in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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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

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