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Note 8 Fair Value of Financial Instruments by Levels Active Market (Details) - EUR (€)
€ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financial instruments at fair value by levels active market [Line Items]      
Assets € 662,885 € 733,797 € 695,471
Liabilities 614,125 683,777 640,546
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 32,371 32,555 31,135
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 15,925 11,367 8,832
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 11,877 12,790 18,076
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 615 2,379 697
Level 1 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Derivatives [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 3,954 6,019 3,530
Level 1 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 4,378 3,826 4,305
Level 1 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 4,158 3,612 4,223
Level 1 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 4 0
Level 1 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 220 210 82
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 916 939 1,214
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 916 939 1,214
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 52,157 60,976 50,896
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 1,178 961 1,794
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 50,952 59,982 49,070
Level 1 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 27 33 33
Level 1 Of Fair Value Hierarchy [Member] | Derivatives hedge accounting [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 63 120 44
Liabilities 53 53 30
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 26,215 27,587 26,266
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Trading derivatives [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 4,755 7,402 4,425
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Short positions [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 15,124 11,805 12,246
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 6,335 8,381 9,595
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 1 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Customer deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 0 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Debt certificates [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 1 0 0
Level 1 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Other financial liabilities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 87,736 71,938 67,262
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 31 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 13,725 11,123 8,178
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 47,279 26,741 30,491
Level 2 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Derivatives [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 26,732 34,043 28,593
Level 2 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 522 381 92
Level 2 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 394 57 1
Level 2 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 128 324 91
Level 2 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 176 178 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 176 178 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 7,545 7,866 9,203
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 36 34 146
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 7,509 7,832 9,057
Level 2 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 2 Of Fair Value Hierarchy [Member] | Derivatives hedge accounting [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 1,733 1,862 1,685
Liabilities 2,573 2,250 2,192
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 64,305 56,127 59,438
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Trading derivatives [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 26,560 34,046 29,466
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Short positions [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 11 504 1
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 37,733 21,577 29,971
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 8,243 8,558 8,629
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Customer deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 809 902 944
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Debt certificates [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 1,956 3,038 3,274
Level 2 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Other financial liabilities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 5,479 4,617 4,410
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 3,386 1,386 1,072
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 37 60 59
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 189 57 55
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 2,913 1,148 849
Level 3 Of Fair Value Hierarchy [Member] | Financial assets held for trading [Member] | Derivatives [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 247 121 109
Level 3 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 1,186 992 1,160
Level 3 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 751 465 103
Level 3 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 28 19
Level 3 Of Fair Value Hierarchy [Member] | Non trading financial assets mandatorily at fair value through profit or loss [Member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 435 499 1,038
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through profit or loss, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 719 598 1,084
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | equity instruments [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 106 105 480
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | Debt securities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 613 493 604
Level 3 Of Fair Value Hierarchy [Member] | Financial assets at fair value through other comprehensive income, category [member] | loans and advances [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Derivatives hedge accounting [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 9 8 0
Liabilities 0 15 11
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 615 395 710
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Trading derivatives [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 389 232 175
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | Short positions [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 0 3 2
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities held for trading [Member] | deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 226 159 533
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 1,439 1,492 1,382
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Customer deposits [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 0 0 0
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Debt certificates [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities 1,439 1,492 1,382
Level 3 Of Fair Value Hierarchy [Member] | Financial liabilities at fair value through profit or loss, category [member] | Other financial liabilities [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Liabilities € 0 € 0 € 0