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Note 7 - Risk Management - Maximum Credit Risk Exposure (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk € 749,524,000,000   € 763,082,000,000
Financial Assets Held For Trading [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 68,074,636,000 € 69,503,000,000 59,581,000,000
Debt securities Financial Assets Held for trading [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 23,969,936,000 26,309,000,000 25,577,000,000
Equity Instruments Financial Assets Held for trading [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 11,457,612,000 8,892,000,000 5,254,000,000
Loans and Advances to Customers Financial Assets Held for trading [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 32,647,000,000 34,303,000,000 28,750,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 5,198,000,000 5,557,000,000 5,135,000,000
Loans and Advances Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 709,000,000 1,120,000,000 1,803,000,000
Debt Securities Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 356,000,000 110,000,000 237,000,000
Equity Instruments Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 4,133,000,000 4,327,000,000 3,095,000,000
Financial assets designated at fair value throught profit or loss [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 1,117,000,000 1,214,000,000 1,313,000,000
Derivatives tradings and hedging [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 46,302,000,000 39,462,000,000 38,249,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 69,537,000,000 61,293,000,000 56,365,000,000
Debt securities Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 68,404,000,000 58,841,000,000 53,737,000,000
Debt securities Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 67,995,000,000 58,590,000,000 53,734,000,000
Debt securities Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 410,000,000 250,000,000 3,000,000
Debt securities Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0 0 0
Equity Instruments Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 1,100,000,000 2,420,000,000 2,595,000,000
Loans And Advances To Credit Iinstitutions Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 33,000,000 33,000,000 33,000,000
Loans And Advances To Credit Iinstitutions Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 33,000,000 33,000,000 33,000,000
Loans And Advances To Credit Iinstitutions Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0 0 0
Loans And Advances To Credit Iinstitutions Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0 0 0
Financial Assets At Amortised Cost Member | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 379,857,000,000 451,640,000,000 431,927,000,000
Financial Assets At Amortised Cost Member | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 334,552,000,000 402,024,000,000 384,632,000,000
Financial Assets At Amortised Cost Member | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 30,607,000,000 33,624,000,000 30,902,000,000
Financial Assets At Amortised Cost Member | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 14,698,000,000 15,993,000,000 16,394,000,000
Loans and advances to central banks Financial Assets At Amortised Cost [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 6,229,000,000 4,285,000,000 3,947,000,000
Loans and advances to central banks Financial Assets At Amortised Cost [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 6,229,000,000 4,285,000,000 3,947,000,000
Loans and advances to central banks Financial Assets At Amortised Cost [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0 0 0
Loans and advances to central banks Financial Assets At Amortised Cost [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0 0 0
Loans and advances to credit institutions Financial Assets At Amortised Cost [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 14,591,000,000 13,664,000,000 9,175,000,000
Loans and advances to credit institutions Financial Assets At Amortised Cost [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 14,565,000,000 13,500,000,000 9,131,000,000
Loans and advances to credit institutions Financial Assets At Amortised Cost [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 20,000,000 158,000,000 34,000,000
Loans and advances to credit institutions Financial Assets At Amortised Cost [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 6,000,000 6,000,000 10,000,000
Loans and advances to customers Financial Assets At Amortised Cost [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 323,252,000,000 394,763,000,000 386,225,000,000
Loans and advances to customers Financial Assets At Amortised Cost [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 277,998,000,000 345,449,000,000 339,204,000,000
Loans and advances to customers Financial Assets At Amortised Cost [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 30,581,000,000 33,360,000,000 30,673,000,000
Loans and advances to customers Financial Assets At Amortised Cost [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 14,672,000,000 15,954,000,000 16,348,000,000
Debt securities Financial Assets At Amortised Cost [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 35,785,000,000 38,930,000,000 32,580,000,000
Debt securities Financial Assets At Amortised Cost [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 35,759,000,000 38,790,000,000 32,350,000,000
Debt securities Financial Assets At Amortised Cost [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 6,000,000 106,000,000 195,000,000
Debt securities Financial Assets At Amortised Cost [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 20,000,000 33,000,000 35,000,000
Total Financial Assets Risk [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 570,084,000,000 628,670,000,000 592,571,000,000
Total Financial Assets Risk [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0    
Total Financial Assets Risk [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0    
Total Financial Assets Risk [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 0    
Total Loan Commitments and Financial Guarantees [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 179,440,000,000 181,116,000,000 170,511,000,000
Total Loan Commitments and Financial Guarantees [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 165,726,000,000 169,663,000,000 161,404,000,000
Total Loan Commitments and Financial Guarantees [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 12,682,000,000 10,452,000,000 8,120,000,000
Total Loan Commitments and Financial Guarantees [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 1,032,000,000 1,001,000,000 987,000,000
Loan Commitments Granted Member [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 132,584,000,000 130,923,000,000 118,959,000,000
Loan Commitments Granted Member [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 124,104,000,000 123,707,000,000 113,403,000,000
Loan Commitments Granted Member [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 8,214,000,000 6,945,000,000 5,308,000,000
Loan Commitments Granted Member [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 265,000,000 270,000,000 247,000,000
Financial Guarantees Granted Member [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 10,665,000,000 10,984,000,000 16,454,000,000
Financial Guarantees Granted Member [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 9,208,000,000 9,804,000,000 14,902,000,000
Financial Guarantees Granted Member [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 1,168,000,000 955,000,000 1,220,000,000
Financial Guarantees Granted Member [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 290,000,000 224,000,000 332,000,000
Other Commitments Granted Member [Member] | Total Member      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 36,190,000,000 39,209,000,000 35,098,000,000
Other Commitments Granted Member [Member] | Stage 1 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 32,414,000,000 36,151,000,000 33,099,000,000
Other Commitments Granted Member [Member] | Stage 2 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk 3,300,000,000 2,552,000,000 1,591,000,000
Other Commitments Granted Member [Member] | Stage 3 [Member]      
Credit Exposure Line Items      
Maximum Exposure To Credit Risk € 477,000,000 € 506,000,000 € 408,000,000