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Note 10 - Financial assets and liabilities held for trading - Derivatives by type of risk by product or by type of market (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading € 30,536 € 35,265 € 42,955
Derivative financial liabilities, held for trading 31,815 36,169 43,118
Interest Rate Risk Member | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 1,940 2,429 3,331
Derivative financial liabilities, held for trading 2,413 2,581 3,428
Notional Amount 207,107 212,554 217,958
Interest Rate Risk Member | OTC Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 17,206 20,177 22,339
Derivative financial liabilities, held for trading 16,356 19,965 21,792
Notional Amount 2,702,909 1,916,920 1,296,183
Interest Rate Risk Member | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 1
Derivative financial liabilities, held for trading 0 0 0
Notional Amount 6,092 600 1,311
Interest Rate Risk Member | Organized Market Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 100
Derivative financial liabilities, held for trading 0 0 102
Notional Amount 13,263 22,416 40,698
Interest Rate Risk Member | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 19,147 22,606 25,770
Derivative financial liabilities, held for trading 18,769 22,546 25,322
Notional Amount 2,929,371 2,152,490 1,556,150
Equity Risk [Member] | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 400 495 718
Derivative financial liabilities, held for trading 341 1,118 1,224
Notional Amount 32,906 34,140 44,837
Equity Risk [Member] | OTC Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 230 83 109
Derivative financial liabilities, held for trading 123 90 91
Notional Amount 6,693 8,158 5,312
Equity Risk [Member] | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 2,168 1,200 1,205
Derivative financial liabilities, held for trading 2,492 1,129 937
Notional Amount 72,062 48,644 36,795
Equity Risk [Member] | Organized Market Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 0
Derivative financial liabilities, held for trading 0 0 0
Notional Amount 2,524 4,631 3,712
Equity Risk [Member] | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 2,799 1,778 2,032
Derivative financial liabilities, held for trading 2,956 2,336 2,252
Notional Amount 114,184 95,573 90,655
Foreign Exchange And Gold Risk [Member] | OTC Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 226 245 417
Derivative financial liabilities, held for trading 309 258 539
Notional Amount 21,293 24,447 27,583
Foreign Exchange And Gold Risk [Member] | OTC Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 8,118 10,092 14,436
Derivative financial liabilities, held for trading 9,329 10,430 14,624
Notional Amount 405,659 348,857 392,240
Foreign Exchange And Gold Risk [Member] | Organized Market Options [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 3
Derivative financial liabilities, held for trading 1 3 0
Notional Amount 45 104 175
Foreign Exchange And Gold Risk [Member] | Organized Market Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 11 34 16
Derivative financial liabilities, held for trading 54 37 16
Notional Amount 5,286 6,997 5,508
Foreign Exchange And Gold Risk [Member] | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 8,355 10,371 14,872
Derivative financial liabilities, held for trading 9,693 10,729 15,179
Notional Amount 432,283 380,404 425,506
Credit Risk Member | Credit Default Swap [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 228 480 246
Derivative financial liabilities, held for trading 248 507 230
Notional Amount 22,791 27,942 15,788
Credit Risk Member | Credit Spread Option [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 2 0 0
Derivative financial liabilities, held for trading 0 0 0
Notional Amount 500 200 150
Credit Risk Member | Total Return Swap [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 2 9 2
Derivative financial liabilities, held for trading 145 9 108
Notional Amount 2,161 2,039 1,895
Credit Risk Member | Other [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 0 14
Derivative financial liabilities, held for trading 0 0 0
Notional Amount 0 0 1,565
Credit Risk Member | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 232 489 261
Derivative financial liabilities, held for trading 393 517 338
Notional Amount 25,452 30,181 19,399
Commodities Risk [Member] | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 3 3 6
Derivative financial liabilities, held for trading 3 3 6
Notional Amount 67 36 169
Other Risk [Member] | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 0 18 13
Derivative financial liabilities, held for trading 0 38 22
Notional Amount 0 561 1,065
Total [Member] | Subtotal [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 30,536 35,265 42,955
Derivative financial liabilities, held for trading 31,815 36,169 43,118
Notional Amount 3,501,358 2,659,246 2,092,945
Total [Member] | Of Which OTC Derivatives With Credit Institutions [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 16,979 21,016 26,438
Derivative financial liabilities, held for trading 18,729 22,804 28,005
Notional Amount 897,384 898,209 806,096
Total [Member] | Of Which OTC Derivatives With Other Financial Institutions [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 7,372 8,695 8,786
Derivative financial liabilities, held for trading 7,758 9,207 9,362
Notional Amount 2,355,784 1,548,919 1,023,174
Total [Member] | Of Which OTC Derivatives With Rest Of Counterparties [Member]      
Derivatives By Type Of Risk By Product Or By Type Of Market Line Items      
Derivative financial assets held for trading 4,005 4,316 6,404
Derivative financial liabilities, held for trading 2,780 2,986 4,694
Notional Amount € 148,917 € 128,722 € 175,473