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Note 8 Fair value of financial instruments by levels (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financial instruments at fair value by levels active market [Line Items]      
Assets € 713,140 € 662,885 € 733,797
Liabilities 662,526 614,125 683,777
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 22,710 32,371 32,555
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 4,369 15,925 11,367
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 16,284 11,877 12,790
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 1,262 615 2,379
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 795 3,954 6,019
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 5,720 4,378 3,826
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 5,457 4,158 3,612
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 19 0 4
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 245 220 210
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 913 916 939
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 913 916 939
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 48,235 52,157 60,976
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 1,040 1,178 961
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 47,169 50,952 59,982
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 26 27 33
Level 1 Of Fair Value Hierarchy [Member] | Derivatives hedge accounting [Member]      
Financial instruments at fair value by levels active market [Line Items]      
Assets 4 63 120
Liabilities 100 53 53
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 20,611 26,215 27,587
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 746 4,755 7,402
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 13,354 15,124 11,805
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 6,511 6,335 8,381
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 0 1 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 0 1 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 85,636 87,736 71,938
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 0 31
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 7,934 13,725 11,123
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 39,562 47,279 26,741
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 38,140 26,732 34,043
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 151 522 381
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 40 394 57
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 111 128 324
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 0 176 178
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 0 176 178
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 10,237 7,545 7,866
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 58 36 34
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 10,179 7,509 7,832
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 1,887 1,733 1,862
Liabilities 3,179 2,573 2,250
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 73,871 64,305 56,127
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 36,161 26,560 34,046
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 133 11 504
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 37,577 37,733 21,577
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 8,990 8,243 8,558
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 700 809 902
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 1,698 1,956 3,038
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 6,592 5,479 4,617
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 2,325 3,386 1,386
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 34 37 60
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 148 189 57
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 1,169 2,913 1,148
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 974 247 121
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 1,017 1,186 992
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 1,014 751 465
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 0 28
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 3 435 499
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 508 719 598
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 100 106 105
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 408 613 493
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 0 9 8
Liabilities 25 0 15
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 1,129 615 395
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 1,002 389 232
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 0 3
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 127 226 159
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 1,590 1,439 1,492
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 1,590 1,439 1,492
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